import subprocess, json, base64, io, os
from pptx import Presentation
from pptx.util import Inches, Pt, Emu
from pptx.dml.color import RGBColor
from pptx.enum.text import PP_ALIGN, MSO_ANCHOR
from pptx.oxml.ns import qn
from pptx.oxml import parse_xml
from lxml import etree
from io import BytesIO
import requests

# ── Colour palette ──────────────────────────────────────────────────────────
DARK_BLUE   = RGBColor(0x0D, 0x2B, 0x55)   # deep navy
MED_BLUE    = RGBColor(0x1A, 0x52, 0x76)   # header bar
ACCENT_TEAL = RGBColor(0x00, 0x96, 0x88)   # accent line / bullets
LIGHT_GRAY  = RGBColor(0xF2, 0xF6, 0xF9)   # slide background
WHITE       = RGBColor(0xFF, 0xFF, 0xFF)
TEXT_DARK   = RGBColor(0x1C, 0x1C, 0x1C)
GOLD        = RGBColor(0xF9, 0xA8, 0x25)

prs = Presentation()
prs.slide_width  = Inches(13.333)
prs.slide_height = Inches(7.5)

blank = prs.slide_layouts[6]  # fully blank

# ── Helper: solid fill rectangle ────────────────────────────────────────────
def rect(slide, x, y, w, h, color):
    shape = slide.shapes.add_shape(1, Inches(x), Inches(y), Inches(w), Inches(h))
    shape.line.fill.background()
    shape.fill.solid()
    shape.fill.fore_color.rgb = color
    return shape

# ── Helper: text box ────────────────────────────────────────────────────────
def tb(slide, text, x, y, w, h, size, bold=False, color=TEXT_DARK,
       align=PP_ALIGN.LEFT, italic=False, wrap=True, font="Calibri"):
    box = slide.shapes.add_textbox(Inches(x), Inches(y), Inches(w), Inches(h))
    tf  = box.text_frame
    tf.word_wrap = wrap
    tf.margin_left = tf.margin_right = tf.margin_top = tf.margin_bottom = 0
    p = tf.paragraphs[0]
    p.alignment = align
    r = p.add_run()
    r.text = text
    r.font.name  = font
    r.font.size  = Pt(size)
    r.font.bold  = bold
    r.font.italic = italic
    r.font.color.rgb = color
    return box

# ── Helper: bullet text box ──────────────────────────────────────────────────
def bullet_box(slide, items, x, y, w, h, size=17, heading=None, head_size=19,
               bullet_color=ACCENT_TEAL, text_color=TEXT_DARK):
    box = slide.shapes.add_textbox(Inches(x), Inches(y), Inches(w), Inches(h))
    tf  = box.text_frame
    tf.word_wrap = True
    tf.margin_left = tf.margin_right = tf.margin_top = tf.margin_bottom = 0
    first = True
    if heading:
        p = tf.paragraphs[0] if first else tf.add_paragraph()
        p.alignment = PP_ALIGN.LEFT
        r = p.add_run()
        r.text = heading
        r.font.name = "Calibri"
        r.font.size = Pt(head_size)
        r.font.bold = True
        r.font.color.rgb = DARK_BLUE
        first = False
    for item in items:
        p = tf.paragraphs[0] if first else tf.add_paragraph()
        p.alignment = PP_ALIGN.LEFT
        p.space_before = Pt(3)
        # bullet symbol run
        rb = p.add_run()
        rb.text = "▶  "
        rb.font.name = "Calibri"
        rb.font.size = Pt(size)
        rb.font.bold = True
        rb.font.color.rgb = bullet_color
        # text run
        rt = p.add_run()
        rt.text = item
        rt.font.name = "Calibri"
        rt.font.size = Pt(size)
        rt.font.color.rgb = text_color
        first = False
    return box

# ── Helper: download image and add to slide ───────────────────────────────
def add_image_from_url(slide, url, x, y, w, h=None):
    try:
        r = requests.get(url, timeout=10, headers={"User-Agent": "Mozilla/5.0"})
        if r.status_code == 200:
            img_stream = BytesIO(r.content)
            if h:
                slide.shapes.add_picture(img_stream, Inches(x), Inches(y), Inches(w), Inches(h))
            else:
                slide.shapes.add_picture(img_stream, Inches(x), Inches(y), Inches(w))
            return True
    except Exception as e:
        print(f"Image load failed: {url} -> {e}")
    return False

# ── Helper: standard slide chrome ───────────────────────────────────────────
def std_chrome(slide, title_text, slide_num, total=18):
    # background
    rect(slide, 0, 0, 13.333, 7.5, LIGHT_GRAY)
    # top header bar
    rect(slide, 0, 0, 13.333, 1.0, DARK_BLUE)
    # accent line under header
    rect(slide, 0, 1.0, 13.333, 0.06, ACCENT_TEAL)
    # title text
    tb(slide, title_text, 0.3, 0.1, 11.5, 0.85, 26, bold=True, color=WHITE,
       align=PP_ALIGN.LEFT)
    # slide number
    tb(slide, f"{slide_num} / {total}", 12.5, 0.12, 0.8, 0.7, 14,
       color=GOLD, align=PP_ALIGN.RIGHT)
    # bottom footer
    rect(slide, 0, 7.2, 13.333, 0.3, MED_BLUE)
    tb(slide, "Processing Errors in Denture Base Resins  |  Phillips' Science of Dental Materials  |  BDS 2nd Year",
       0.2, 7.2, 12.0, 0.3, 10, color=WHITE, italic=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 1 – TITLE SLIDE
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
rect(s, 0, 0, 13.333, 7.5, DARK_BLUE)
rect(s, 0, 0, 13.333, 0.08, ACCENT_TEAL)
rect(s, 0, 7.42, 13.333, 0.08, ACCENT_TEAL)
rect(s, 0, 3.2, 13.333, 0.06, GOLD)

# big title
tb(s, "Processing Errors in", 1.0, 1.0, 11.333, 1.1, 40, bold=True,
   color=WHITE, align=PP_ALIGN.CENTER)
tb(s, "Denture Base Resins", 1.0, 2.0, 11.333, 1.1, 40, bold=True,
   color=GOLD, align=PP_ALIGN.CENTER)
tb(s, "Reference: Phillips' Science of Dental Materials", 1.5, 3.35, 10.333, 0.7, 20,
   color=ACCENT_TEAL, align=PP_ALIGN.CENTER, italic=True)
tb(s, "BDS 2nd Year  |  Department of Dental Materials", 1.5, 4.0, 10.333, 0.6, 18,
   color=RGBColor(0xCC, 0xDD, 0xFF), align=PP_ALIGN.CENTER)
tb(s, "Presented to: Head of Department", 1.5, 4.55, 10.333, 0.5, 16,
   color=RGBColor(0xAA, 0xBB, 0xDD), align=PP_ALIGN.CENTER)
tb(s, "July 2026", 1.5, 5.05, 10.333, 0.5, 16,
   color=RGBColor(0xAA, 0xBB, 0xDD), align=PP_ALIGN.CENTER)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 2 – TABLE OF CONTENTS
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Contents at a Glance", 2)
topics = [
    "1.  Introduction to Denture Base Materials",
    "2.  What is PMMA? (From Basics)",
    "3.  Chemistry of Polymerization",
    "4.  Composition of Denture Base Resin",
    "5.  Stages of Mixing (Dough Stages)",
    "6.  Processing Overview",
    "7.  Processing Errors – Classification",
    "8.  POROSITY – Types and Mechanisms",
    "9.  Gaseous Porosity",
    "10. Contraction Porosity & Granular Porosity",
    "11. Dimensional Changes",
    "12. Residual Monomer",
    "13. Processing Strains",
    "14. Other Errors (Crazing, Warpage, Colour)",
    "15. Prevention & Clinical Significance",
    "16. Summary & Key Takeaways",
]
bullet_box(s, topics, 0.5, 1.2, 12.5, 6.0, size=15, bullet_color=ACCENT_TEAL)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 3 – INTRODUCTION TO DENTURE BASE MATERIALS
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Introduction to Denture Base Materials", 3)

rect(s, 0.4, 1.15, 8.5, 5.8, WHITE)  # content card
bullet_box(s, [
    "A denture base is the part of a denture that rests on the oral mucosa and supports the artificial teeth.",
    "Ideal properties: Adequate strength, low density, good thermal conductivity, dimensional stability, biocompatibility.",
    "Historical materials: Vulcanite rubber (1855), Celluloid, Porcelain — each had major drawbacks.",
    "Modern standard: Poly(methyl methacrylate) — PMMA — introduced by ICI (Imperial Chemical Industries) in 1937.",
    "PMMA revolutionized prosthodontics due to its esthetics, ease of processing, and reparability.",
    "Classification: Heat-activated | Chemically-activated (self-cure) | Light-activated | Microwave-cured",
], 0.6, 1.25, 8.1, 5.5, size=16)

# side info card
rect(s, 9.2, 1.15, 3.9, 2.6, MED_BLUE)
tb(s, "Why PMMA?", 9.3, 1.2, 3.7, 0.5, 17, bold=True, color=GOLD)
for i, point in enumerate(["Easy to process", "Excellent esthetics", "Tissue compatible",
                             "Easy to repair", "Low cost"]):
    tb(s, f"✔  {point}", 9.3, 1.75 + i*0.45, 3.7, 0.4, 15, color=WHITE)

rect(s, 9.2, 4.0, 3.9, 2.95, RGBColor(0xE8, 0xF4, 0xF8))
tb(s, "ADA Spec No. 12", 9.35, 4.05, 3.6, 0.4, 15, bold=True, color=DARK_BLUE)
tb(s, ("Specifies requirements for "
       "denture base polymers including "
       "dimensional stability, transverse "
       "strength, solubility, and water "
       "sorption limits."),
   9.35, 4.5, 3.6, 2.3, 13, color=TEXT_DARK, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 4 – WHAT IS PMMA (FROM BASICS)
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "What is PMMA? — From the Basics", 4)

# 3-column layout
cols = [
    ("Monomer\n(MMA)", "Methyl Methacrylate\nCH₂=C(CH₃)COOCH₃\n\n• Small, reactive molecule\n• Clear liquid\n• Boiling pt: 100.6°C\n• MW: 100.12 g/mol\n• Density: 0.94 g/mL\n• Produces heat on polymerization", MED_BLUE, WHITE),
    ("Polymer\n(PMMA)", "Poly(methyl methacrylate)\n\n• White powder beads (~150 µm)\n• Long chain repeat units\n• Pre-polymerized MMA\n• High MW: 500,000–600,000 g/mol\n• Insoluble in water\n• Transparent / pigmented", ACCENT_TEAL, WHITE),
    ("Dough Stage", "When powder + liquid mixed (3:1 by volume):\n\n1. Sandy / grainy stage\n2. Stringy stage\n3. Dough stage (IDEAL for packing)\n4. Rubbery stage\n5. Stiff stage\n\nPacking done at DOUGH stage!", DARK_BLUE, WHITE),
]
for i, (h, body, bg, fg) in enumerate(cols):
    cx = 0.4 + i * 4.3
    rect(s, cx, 1.2, 4.1, 1.0, bg)
    tb(s, h, cx+0.1, 1.25, 3.9, 0.9, 19, bold=True, color=fg, align=PP_ALIGN.CENTER)
    rect(s, cx, 2.2, 4.1, 4.7, RGBColor(0xF0, 0xF7, 0xFF) if bg != DARK_BLUE else RGBColor(0xE8, 0xF0, 0xFA))
    tb(s, body, cx+0.15, 2.3, 3.8, 4.5, 14, color=TEXT_DARK if bg != DARK_BLUE else DARK_BLUE, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 5 – CHEMISTRY OF POLYMERIZATION
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Chemistry of Polymerization of PMMA", 5)

rect(s, 0.4, 1.15, 12.5, 5.85, WHITE)
tb(s, "Free Radical Addition Polymerization — 4 Stages", 0.55, 1.2, 12.0, 0.6,
   20, bold=True, color=DARK_BLUE)
rect(s, 0.55, 1.8, 12.2, 0.05, ACCENT_TEAL)

stages = [
    ("1. INITIATION",
     "Benzoyl peroxide (initiator) decomposes on heating (>60°C) to release free radicals:\n"
     "  (C₆H₅COO)₂  →  2 C₆H₅COO•  →  2 C₆H₅• + 2 CO₂\n"
     "The free radical attacks the C=C double bond of MMA monomer, opening it.",
     GOLD),
    ("2. PROPAGATION",
     "The activated monomer adds successively to other monomers — chain grows rapidly.\n"
     "  R• + CH₂=C(CH₃)COOCH₃  →  R-CH₂-C•(CH₃)COOCH₃  →  chain continues\n"
     "Exothermic reaction; heat released = up to 57 kJ/mol (important for porosity!)",
     ACCENT_TEAL),
    ("3. TERMINATION",
     "Two growing chains combine (coupling) or disproportionate — chain growth stops.\n"
     "Incomplete termination → residual monomer remains (clinically important).",
     MED_BLUE),
    ("4. INHIBITION",
     "Hydroquinone (inhibitor) is added to prevent premature polymerization during storage.\n"
     "Oxygen also acts as inhibitor at the surface — surface can remain slightly tacky.",
     DARK_BLUE),
]

for i, (title, body, color) in enumerate(stages):
    y = 1.9 + i * 1.25
    rect(s, 0.55, y, 0.12, 1.0, color)
    tb(s, title, 0.8, y, 3.0, 0.5, 15, bold=True, color=color)
    tb(s, body, 0.8, y + 0.45, 12.0, 0.8, 13, color=TEXT_DARK, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 6 – COMPOSITION OF DENTURE BASE RESIN
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Composition of Denture Base Resin (Heat-Cure)", 6)

# Powder column
rect(s, 0.4, 1.15, 6.0, 5.9, WHITE)
tb(s, "POWDER (Polymer)", 0.55, 1.2, 5.7, 0.55, 19, bold=True, color=DARK_BLUE)
rect(s, 0.55, 1.75, 5.7, 0.05, ACCENT_TEAL)
powder = [
    ("PMMA beads", "Major component — pre-polymerized beads ~150 µm"),
    ("Benzoyl Peroxide (BPO)", "Initiator: 0.5–1.5% — decomposes on heating"),
    ("Dibutyl Phthalate", "Plasticizer — improves flexibility"),
    ("Pigments", "Mercuric sulfide / cadmium / organic dyes for tissue shade"),
    ("Opacifiers", "Titanium dioxide, zinc oxide"),
    ("Cross-linking agent", "Ethylene glycol dimethacrylate (EGDMA) — improves strength"),
]
for i, (comp, role) in enumerate(powder):
    y = 1.85 + i * 0.85
    rect(s, 0.6, y, 0.35, 0.45, ACCENT_TEAL)
    tb(s, comp, 1.1, y, 2.8, 0.45, 14, bold=True, color=DARK_BLUE)
    tb(s, role, 1.1, y + 0.42, 5.0, 0.38, 13, color=TEXT_DARK, italic=True)

# Liquid column
rect(s, 6.7, 1.15, 6.3, 5.9, WHITE)
tb(s, "LIQUID (Monomer)", 6.85, 1.2, 6.0, 0.55, 19, bold=True, color=MED_BLUE)
rect(s, 6.85, 1.75, 5.9, 0.05, GOLD)
liquid = [
    ("Methyl methacrylate (MMA)", "Major component — 97–98%; clear liquid monomer"),
    ("Hydroquinone", "Inhibitor — prevents premature polymerization (0.006%)"),
    ("EGDMA / GDMA", "Cross-linker — used in some formulations"),
    ("UV Absorber", "Stabilizes colour; prevents yellowing on light exposure"),
    ("Dimethyl-p-toluidine", "In self-cure only — activates BPO at room temperature"),
]
for i, (comp, role) in enumerate(liquid):
    y = 1.85 + i * 1.0
    rect(s, 6.9, y, 0.35, 0.5, GOLD)
    tb(s, comp, 7.4, y, 3.2, 0.5, 14, bold=True, color=MED_BLUE)
    tb(s, role, 7.4, y + 0.47, 5.3, 0.45, 13, color=TEXT_DARK, italic=True)

rect(s, 6.7, 6.05, 6.3, 0.95, RGBColor(0xFFF8E1))
tb(s, "Mix Ratio: 3 parts powder : 1 part liquid (by volume)  |  2:1 by weight",
   6.85, 6.1, 6.1, 0.85, 14, bold=True, color=DARK_BLUE)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 7 – STAGES OF DOUGH + PROCESSING OVERVIEW
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Dough Stages & Processing Overview", 7)

rect(s, 0.4, 1.15, 5.5, 5.9, WHITE)
tb(s, "5 Stages of Mixing (Dough Formation)", 0.55, 1.2, 5.2, 0.55, 17, bold=True, color=DARK_BLUE)
dough_stages = [
    ("Stage 1: Sandy / Grainy", "Powder not yet wetted by monomer. Gritty texture."),
    ("Stage 2: Stringy / Tacky", "Monomer dissolves surface of beads. Sticky — sticks to fingers."),
    ("Stage 3: DOUGH (Ideal!)", "Homogeneous, non-sticky, pliable. Does NOT stick to glass. ← PACK NOW"),
    ("Stage 4: Rubbery / Elastic", "Material rebounds when stretched. Too late to pack!"),
    ("Stage 5: Stiff / Hard", "No longer workable. Polymerization advanced."),
]
colors5 = [RGBColor(0xCC,0xCC,0xFF), RGBColor(0xFF,0xEE,0xAA),
           RGBColor(0x90,0xEE,0x90), RGBColor(0xFF,0xCC,0x99), RGBColor(0xFF,0x99,0x99)]
for i, (stage, desc) in enumerate(dough_stages):
    y = 1.85 + i * 1.0
    rect(s, 0.55, y, 5.2, 0.85, colors5[i])
    tb(s, stage, 0.65, y + 0.05, 5.0, 0.4, 14, bold=True, color=DARK_BLUE)
    tb(s, desc, 0.65, y + 0.43, 5.0, 0.38, 12.5, color=TEXT_DARK, italic=True)

rect(s, 6.2, 1.15, 6.8, 5.9, RGBColor(0xF0, 0xF7, 0xFF))
tb(s, "Processing Steps (Compression Moulding)", 6.35, 1.2, 6.5, 0.55, 17, bold=True, color=DARK_BLUE)
steps = [
    "1. Wax-up of denture on master cast",
    "2. Flasking in dental flask (gypsum investment)",
    "3. Wax elimination (dewaxing) — boiling water",
    "4. Applying separating medium (tin foil substitute / Na alginate)",
    "5. Mixing powder & liquid → wait for dough stage",
    "6. Packing dough into mould",
    "7. Trial closure (preliminary press) — check for excess",
    "8. Final closure & clamping",
    "9. Curing in water bath",
    "   • Short cure: 74°C × 7–9 hrs (or 74°C × 2 hrs + 100°C × 1 hr)",
    "   • Long cure: 65°C × 8 hrs + 100°C × 1 hr",
    "10. Bench cooling → deflask → trim & polish",
]
bullet_box(s, steps, 6.35, 1.8, 6.5, 5.2, size=13.5, bullet_color=ACCENT_TEAL)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 8 – PROCESSING ERRORS – CLASSIFICATION
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Processing Errors — Classification", 8)

tb(s, "Processing errors occur due to incorrect technique, equipment failure, or material mishandling.",
   0.5, 1.15, 12.5, 0.55, 17, color=DARK_BLUE, bold=True)

cats = [
    ("POROSITY", ["Gaseous porosity", "Contraction porosity", "Granular / marble-like appearance"], ACCENT_TEAL),
    ("DIMENSIONAL\nCHANGES", ["Polymerization shrinkage (6–7% volumetric)", "Warpage on deflasking", "Increased vertical dimension"], MED_BLUE),
    ("RESIDUAL\nMONOMER", ["Incomplete polymerization", "Tissue toxicity / allergy risk", "Reduced mechanical properties"], GOLD),
    ("PROCESSING\nSTRAINS", ["Internal stresses locked in", "Crazing on solvent contact", "Distortion over time"], RGBColor(0xE53935)),
    ("OTHER ERRORS", ["Surface porosity (air inclusions)", "Colour mismatch", "Contamination of mould"], RGBColor(0x6A,0x1B,0x9A)),
]

for i, (cat, pts, color) in enumerate(cats):
    col = i % 3
    row = i // 3
    cx = 0.4 + col * 4.3
    cy = 1.85 + row * 2.7
    rect(s, cx, cy, 4.1, 0.85, color)
    tb(s, cat, cx+0.1, cy+0.1, 3.9, 0.7, 17, bold=True, color=WHITE, align=PP_ALIGN.CENTER)
    rect(s, cx, cy+0.85, 4.1, 1.7, RGBColor(0xF5,0xF5,0xF5))
    for j, pt in enumerate(pts):
        tb(s, f"• {pt}", cx+0.15, cy+0.92 + j*0.52, 3.85, 0.5, 13.5, color=DARK_BLUE)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 9 – POROSITY OVERVIEW
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Porosity — Overview & Clinical Significance", 9)

rect(s, 0.4, 1.15, 12.5, 1.2, RGBColor(0xFF, 0xF3, 0xE0))
tb(s, "Definition:", 0.55, 1.2, 1.5, 0.5, 16, bold=True, color=DARK_BLUE)
tb(s, ("Porosity refers to the presence of voids — either internal (subsurface) or external (surface) — "
       "within the cured denture base resin. These voids compromise the physical, esthetic, and hygienic "
       "properties of the denture."),
   0.55, 1.5, 12.2, 0.8, 15, color=TEXT_DARK)

types_poro = [
    ("Gaseous Porosity",
     "Internal voids — clustered in thicker areas. Caused by monomer volatilization during processing.",
     ACCENT_TEAL),
    ("Contraction Porosity",
     "Voids due to volumetric shrinkage of monomer (contracts 20-21% on polymerization). Located in bulk areas.",
     MED_BLUE),
    ("Granular / Marble-like",
     "Surface/subsurface granular appearance in thin sections. Caused by incorrect P:L ratio or rapid mixing.",
     GOLD),
    ("Air Inclusion Porosity",
     "Air bubbles trapped during mixing / packing. Appear near surface. Irregular shaped voids.",
     RGBColor(0xE53935)),
]
for i, (t, d, c) in enumerate(types_poro):
    col = i % 2
    row = i // 2
    cx = 0.4 + col * 6.4
    cy = 2.5 + row * 2.3
    rect(s, cx, cy, 6.1, 0.6, c)
    tb(s, t, cx+0.15, cy+0.08, 5.8, 0.5, 16, bold=True, color=WHITE)
    rect(s, cx, cy+0.6, 6.1, 1.5, WHITE)
    tb(s, d, cx+0.15, cy+0.68, 5.8, 1.3, 14.5, color=TEXT_DARK, wrap=True)

# Clinical significance box
rect(s, 0.4, 7.0, 12.5, 0.42, RGBColor(0xFF, 0xEB, 0xEE))
tb(s, ("Clinical significance: Porous dentures accumulate plaque/Candida, have reduced strength, "
       "poor esthetics, and unpleasant odour."),
   0.55, 7.02, 12.2, 0.38, 14, bold=True, color=RGBColor(0xC6, 0x28, 0x28))

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 10 – GASEOUS POROSITY (DETAIL)
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Gaseous Porosity — Mechanism & Prevention", 10)

rect(s, 0.4, 1.15, 7.8, 5.9, WHITE)
tb(s, "Gaseous Porosity", 0.55, 1.2, 7.5, 0.55, 20, bold=True, color=ACCENT_TEAL)
rect(s, 0.55, 1.75, 7.5, 0.05, ACCENT_TEAL)

gas_content = [
    ("Cause:", "MMA monomer has a BOILING POINT of 100.6°C. If the curing temperature rises above this point, monomer vaporizes and creates bubbles within the curing mass."),
    ("Location:", "Found in THICKER sections of the denture — because heat builds up there due to poor dissipation. The exothermic polymerization reaction generates additional heat."),
    ("Appearance:", "Round, spherical voids distributed especially in palatal region and flanges (thicker areas). Completely enclosed or opening at surface."),
    ("Key threshold:", "Processing at 74°C for 7-9 hours PREVENTS boiling. Raising temperature directly to 100°C during initial curing CAUSES gaseous porosity."),
    ("Exothermic risk:", "Each mole of MMA releases ~57 kJ of heat. In thick areas, this heat cannot dissipate fast enough — local temperature can exceed 100°C even in a 74°C water bath."),
    ("P:L ratio effect:", "Excess monomer (too much liquid) increases risk — more monomer available to vaporize."),
]
for i, (label, body) in enumerate(gas_content):
    y = 1.85 + i * 0.85
    tb(s, label, 0.6, y, 1.4, 0.4, 14, bold=True, color=ACCENT_TEAL)
    tb(s, body, 2.1, y, 5.9, 0.8, 13.5, color=TEXT_DARK, wrap=True)

# prevention box
rect(s, 0.55, 6.6, 7.5, 0.42, RGBColor(0xE0, 0xF2, 0xF1))
tb(s, "Prevention: Maintain water bath at 74°C for full cure time. Avoid rapid temperature rise.", 0.65, 6.62, 7.3, 0.38, 13.5, color=DARK_BLUE, bold=True)

# Image panel
rect(s, 8.5, 1.15, 4.5, 5.9, RGBColor(0xF0, 0xF7, 0xFF))
tb(s, "Clinical Photo — Gaseous Porosity", 8.6, 1.2, 4.3, 0.5, 14, bold=True, color=DARK_BLUE)
add_image_from_url(s, "https://pocketdentistry.com/wp-content/uploads/285/f120.jpg",
                   8.55, 1.75, 4.3, 2.8)
tb(s, "Subsurface voids in thick palatal area", 8.55, 4.6, 4.3, 0.4, 12, italic=True, color=TEXT_DARK, align=PP_ALIGN.CENTER)

rect(s, 8.5, 5.1, 4.5, 1.95, RGBColor(0xE8, 0xF5, 0xE9))
tb(s, "Remember:", 8.6, 5.15, 4.3, 0.4, 14, bold=True, color=DARK_BLUE)
tb(s, "Gaseous porosity = VOLATILE monomer\nboiling inside thick resin sections\n= preventable with correct curing cycle",
   8.6, 5.55, 4.3, 1.4, 13, color=TEXT_DARK, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 11 – CONTRACTION & GRANULAR POROSITY
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Contraction Porosity & Granular Porosity", 11)

# Left: contraction
rect(s, 0.4, 1.15, 6.1, 5.9, WHITE)
tb(s, "Contraction Porosity", 0.55, 1.2, 5.8, 0.55, 18, bold=True, color=MED_BLUE)
rect(s, 0.55, 1.75, 5.8, 0.05, MED_BLUE)
cont = [
    ("Cause:", "Volumetric contraction of monomer during polymerization (~20-21% for pure MMA). In powder-liquid system = 5-8% contraction."),
    ("Location:", "Areas isolated from monomer supply — thick areas, last to polymerize. Irregular, non-spherical voids."),
    ("Mechanism:", "As outer surface solidifies first, the inner bulk continues to shrink. No fresh monomer can flow in — hence voids form."),
    ("Prevention:", "Adequate packing pressure during processing. Use correct P:L ratio. Maintain pressure throughout cure."),
]
for i, (label, body) in enumerate(cont):
    y = 1.85 + i * 1.2
    tb(s, label, 0.6, y, 1.4, 0.4, 14, bold=True, color=MED_BLUE)
    tb(s, body, 2.1, y, 4.1, 1.1, 13.5, color=TEXT_DARK, wrap=True)

rect(s, 0.55, 6.6, 5.8, 0.42, RGBColor(0xE3, 0xF2, 0xFD))
tb(s, "Volumetric shrinkage (Phillips): 6–7% | Linear shrinkage: 0.2–0.5%",
   0.65, 6.62, 5.6, 0.38, 13, color=DARK_BLUE, bold=True)

# Right: granular
rect(s, 6.8, 1.15, 6.15, 5.9, WHITE)
tb(s, "Granular / Marble-like Porosity", 6.95, 1.2, 5.8, 0.55, 18, bold=True, color=GOLD)
rect(s, 6.95, 1.75, 5.8, 0.05, GOLD)
gran = [
    ("Cause:", "Too much powder (P:L > recommended). Insufficient monomer to wet all polymer beads. Results in granular, inhomogeneous mix."),
    ("Appearance:", "White, chalky, frosty appearance — especially in THIN sections. Surface has a marbled look."),
    ("Mechanism:", "Unwetted polymer beads don't dissolve into dough. They remain as discrete particles → granular structure on curing."),
    ("Prevention:", "Maintain correct powder-to-liquid ratio: 3:1 (vol) or 2:1 (wt). Shake powder container before use. Mix slowly."),
]
for i, (label, body) in enumerate(gran):
    y = 1.85 + i * 1.2
    tb(s, label, 7.0, y, 1.4, 0.4, 14, bold=True, color=GOLD)
    tb(s, body, 8.5, y, 4.2, 1.1, 13.5, color=TEXT_DARK, wrap=True)

rect(s, 6.8, 6.6, 6.15, 0.42, RGBColor(0xFFF8E1))
tb(s, "Granular porosity = EXCESS POWDER — thin sections look chalky/frosty.",
   6.95, 6.62, 5.9, 0.38, 13, color=DARK_BLUE, bold=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 12 – DIMENSIONAL CHANGES
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Dimensional Changes During Processing", 12)

rect(s, 0.4, 1.15, 12.5, 0.9, RGBColor(0xE8, 0xF5, 0xE9))
tb(s, ("According to Phillips' Science of Dental Materials: "
       "Heat-activated acrylic resins show volumetric shrinkage of 6–7% and linear shrinkage of 0.2–0.5%."),
   0.55, 1.2, 12.2, 0.82, 15.5, color=DARK_BLUE, bold=True)

sources = [
    ("1. Polymerization Shrinkage",
     "• Pure MMA monomer contracts ~20% on polymerization\n"
     "• With powder-liquid system: ~5-8% volumetric shrinkage\n"
     "• Actual linear shrinkage = 0.2-0.5% (less than expected because thermal effects compensate)",
     ACCENT_TEAL),
    ("2. Thermal Contraction",
     "• Major contributor to dimensional change\n"
     "• Curing at 74-100°C; cooling to room temp causes significant thermal shrinkage\n"
     "• CTE of PMMA ≈ 80 × 10⁻⁶ /°C (10× higher than bone/teeth)\n"
     "• Rapid cooling → more thermal contraction → warping",
     MED_BLUE),
    ("3. Water Sorption Expansion",
     "• PMMA absorbs water (0.69 mg/cm² per ADA spec 12)\n"
     "• Absorption causes slight dimensional expansion\n"
     "• Partially compensates for polymerization shrinkage\n"
     "• Clinically: denture placed in water after processing improves fit",
     GOLD),
    ("4. Gypsum Setting Expansion",
     "• Investment gypsum expands during setting\n"
     "• This expansion slightly enlarges the mould\n"
     "• Net effect: may slightly increase vertical dimension\n"
     "• Compression moulding → usually slight INCREASE in OVD",
     RGBColor(0xE53935)),
]

for i, (title, body, color) in enumerate(sources):
    col = i % 2
    row = i // 2
    cx = 0.4 + col * 6.4
    cy = 2.2 + row * 2.5
    rect(s, cx, cy, 6.1, 0.55, color)
    tb(s, title, cx+0.15, cy+0.07, 5.8, 0.45, 16, bold=True, color=WHITE)
    rect(s, cx, cy+0.55, 6.1, 1.8, RGBColor(0xFA, 0xFA, 0xFF))
    tb(s, body, cx+0.15, cy+0.62, 5.8, 1.65, 13, color=TEXT_DARK, wrap=True)

rect(s, 0.4, 7.05, 12.5, 0.38, RGBColor(0xFF, 0xEB, 0xEE))
tb(s, "Clinical Impact: Changes in OVD, poor fit, occlusal discrepancies → immediate need for occlusal adjustment.",
   0.55, 7.06, 12.2, 0.35, 13.5, bold=True, color=RGBColor(0xC6, 0x28, 0x28))

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 13 – RESIDUAL MONOMER
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Residual Monomer — Causes, Effects & Management", 13)

rect(s, 0.4, 1.15, 7.8, 5.9, WHITE)
tb(s, "Residual Monomer (Unreacted MMA)", 0.55, 1.2, 7.5, 0.55, 18, bold=True, color=DARK_BLUE)

res_content = [
    ("Definition:", "Free, unreacted methyl methacrylate remaining in the cured resin. Normal: 0.5–3.5% in heat-cure; up to 7% in self-cure resins."),
    ("Cause 1:", "Incomplete / shortened curing cycle — polymerization not fully completed."),
    ("Cause 2:", "Incorrect P:L ratio — excess monomer overwhelms initiation capacity."),
    ("Cause 3:", "Self-cure (cold-cure) resins — low temperature = less efficient polymerization → higher residual."),
    ("Effect — Biocompatibility:", "MMA is a known sensitizer. Can cause contact stomatitis, mucosal irritation, type IV hypersensitivity in susceptible patients."),
    ("Effect — Mechanical:", "Acts as plasticizer → reduces strength, hardness, and modulus of elasticity. Lowers glass transition temperature."),
    ("Effect — Dimensional:", "Residual monomer diffuses out gradually over time → causes additional shrinkage after denture is placed."),
    ("Reduction Methods:", "Longer curing cycles. Post-cure in boiling water 30 min. Correct P:L ratio. Microwave post-cure. Store 24h in water before delivery."),
]
for i, (label, body) in enumerate(res_content):
    y = 1.85 + i * 0.72
    tb(s, label, 0.6, y, 1.5, 0.35, 13.5, bold=True, color=DARK_BLUE)
    tb(s, body, 2.2, y, 5.8, 0.68, 13, color=TEXT_DARK, wrap=True)

# right panel
rect(s, 8.5, 1.15, 4.5, 5.9, RGBColor(0xFFF3E0))
tb(s, "Key Comparison", 8.6, 1.2, 4.3, 0.5, 16, bold=True, color=DARK_BLUE)
rect(s, 8.6, 1.7, 4.2, 0.05, GOLD)

comparison = [
    ("Heat-Cure", "~0.5–1.5% residual"),
    ("Self-Cure", "~3–7% residual"),
    ("Microwave", "~0.5–1.0% residual"),
    ("Light-Cure", "<1% residual"),
]
tb(s, "Type", 8.65, 1.8, 2.0, 0.45, 14, bold=True, color=DARK_BLUE)
tb(s, "Residual MMA", 10.7, 1.8, 2.2, 0.45, 14, bold=True, color=DARK_BLUE)
for i, (t, v) in enumerate(comparison):
    bg = RGBColor(0xFF,0xFF,0xFF) if i%2==0 else RGBColor(0xFF,0xF0,0xD0)
    rect(s, 8.55, 2.3+i*0.7, 4.3, 0.65, bg)
    tb(s, t, 8.65, 2.35+i*0.7, 2.0, 0.55, 14, color=MED_BLUE, bold=(i==0))
    tb(s, v, 10.7, 2.35+i*0.7, 2.2, 0.55, 14, color=DARK_BLUE)

rect(s, 8.5, 5.15, 4.5, 1.9, RGBColor(0xFF,0xEB,0xEE))
tb(s, "ADA Note:", 8.6, 5.2, 4.3, 0.4, 14, bold=True, color=RGBColor(0xC6,0x28,0x28))
tb(s, ("Post-cure in boiling water for 30 min significantly reduces residual monomer "
       "and is recommended before denture delivery."),
   8.6, 5.62, 4.3, 1.35, 13, color=TEXT_DARK, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 14 – PROCESSING STRAINS & CRAZING
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Processing Strains, Crazing & Warpage", 14)

rect(s, 0.4, 1.15, 6.0, 5.9, WHITE)
tb(s, "Processing Strains (Internal Stresses)", 0.55, 1.2, 5.7, 0.55, 17, bold=True, color=DARK_BLUE)
strain_pts = [
    ("Origin:", "Non-uniform polymerization + thermal contraction during cooling → locked-in internal stresses."),
    ("Where:", "Dense/thick regions shrink differentially vs thin sections → stress gradient."),
    ("Rapid cooling:", "Fast cooling from curing temperature to room temperature → more stress locked in than slow/bench cooling."),
    ("Effect 1 — WARPAGE:", "Internal strains release over time → dimensional distortion (warpage) of the denture base."),
    ("Effect 2 — CRAZING:", "When stresses exceed cohesive strength → micro-crack network on surface (crazing). Accelerated by solvents like alcohol/acetone."),
    ("Prevention:", "Slow, controlled bench cooling inside the flask. Avoid immediate cold water quench. Allow flask to cool to room temperature."),
]
for i, (label, body) in enumerate(strain_pts):
    y = 1.85 + i * 0.87
    tb(s, label, 0.6, y, 1.3, 0.35, 14, bold=True, color=DARK_BLUE)
    tb(s, body, 2.0, y, 4.3, 0.82, 13, color=TEXT_DARK, wrap=True)

rect(s, 6.2, 1.15, 6.8, 5.9, RGBColor(0xF3, 0xE5, 0xF5))
tb(s, "Crazing — Detail", 6.35, 1.2, 6.5, 0.55, 17, bold=True, color=RGBColor(0x6A,0x1B,0x9A))
craze_pts = [
    "Crazing = network of surface/subsurface micro-cracks",
    "Reduces clarity and optical properties of resin",
    "Acts as stress concentrators → promotes fracture propagation",
    "Triggered by: internal stresses + chemical attack from organic solvents",
    "Common solvents: acetone (nail polish remover), alcohol mouthwashes",
    "Patients should AVOID alcohol-based mouthwashes with acrylic dentures",
    "Thermocycling (temperature changes during eating) can also propagate crazes",
    "Treatment: impossible to reverse — prevention is key",
]
bullet_box(s, craze_pts, 6.35, 1.8, 6.5, 3.8, size=14)

rect(s, 6.2, 5.65, 6.8, 1.4, RGBColor(0xFF,0xEB,0xEE))
tb(s, "Warpage vs Crazing:", 6.35, 5.7, 6.5, 0.4, 14, bold=True, color=DARK_BLUE)
tb(s, ("Warpage = shape distortion (dimensional)\n"
       "Crazing = surface micro-cracking (optical + structural)"),
   6.35, 6.1, 6.5, 0.9, 13.5, color=TEXT_DARK, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 15 – OTHER ERRORS
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Other Processing Errors & Poor Practices", 15)

errors = [
    ("Air Inclusion\nPorosity",
     "Trapped during mixing or spatulation.\nIrregular-shaped voids near surface.\nPrevention: Slow, deliberate mixing.",
     ACCENT_TEAL),
    ("Colour Mismatch /\nPigment Issues",
     "Powder not shaken before use → pigment settles → uneven shade.\nToo little powder → pale shade.\nOxidation → yellowing over time.",
     GOLD),
    ("Poor Mould\nSeparation",
     "No/inadequate separating medium → resin adheres to gypsum → rough fitting surface → tissue damage.\nUse Na-alginate separating medium.",
     MED_BLUE),
    ("Flash / Thick\nFlange",
     "Premature trial closure or too much resin → flash lines → thick flanges → discomfort.\nCause: packing before dough stage.",
     RGBColor(0xE53935)),
    ("Incomplete\nPolymerization",
     "Too short curing cycle or wrong temperature → soft, rubbery, chalky resin.\nSurface tacky (oxygen inhibition layer).\nRe-processing may help.",
     RGBColor(0x6A,0x1B,0x9A)),
    ("Mould Expansion\nErrors",
     "Over-packing → excessive pressure → mould distortion → dimensional errors.\nUnder-packing → voids and porosity.",
     DARK_BLUE),
]

for i, (title, body, color) in enumerate(errors):
    col = i % 3
    row = i // 3
    cx = 0.4 + col * 4.3
    cy = 1.2 + row * 2.9
    rect(s, cx, cy, 4.1, 0.7, color)
    tb(s, title, cx+0.1, cy+0.08, 3.9, 0.6, 15, bold=True, color=WHITE, align=PP_ALIGN.CENTER)
    rect(s, cx, cy+0.7, 4.1, 2.05, RGBColor(0xFA, 0xFA, 0xFF))
    tb(s, body, cx+0.15, cy+0.77, 3.8, 1.9, 13, color=TEXT_DARK, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 16 – PREVENTION & CLINICAL SIGNIFICANCE
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Prevention of Processing Errors & Clinical Significance", 16)

rect(s, 0.4, 1.15, 7.5, 5.9, WHITE)
tb(s, "Prevention Strategies", 0.55, 1.2, 7.2, 0.55, 18, bold=True, color=DARK_BLUE)

prevention = [
    "Correct P:L ratio (3:1 by volume / 2:1 by weight) — weigh / measure carefully",
    "Pack only at DOUGH stage — prevents flash and internal stresses",
    "Use correct curing cycle: 74°C × 7-9 hrs OR 74°C × 2 hrs + 100°C × 1 hr",
    "NEVER raise temp rapidly above 100°C early in curing — prevents gaseous porosity",
    "Slow bench cooling (do NOT quench in cold water) — prevents warpage",
    "Apply adequate separating medium uniformly before packing",
    "Post-cure in boiling water 30 min before finishing — reduces residual monomer",
    "Store finished denture in water 24h before delivery — water sorption expansion improves fit",
    "Shake polymer powder container before mixing — ensures even pigment distribution",
    "Regular servicing of water bath thermostat — maintain accurate temperature",
]
bullet_box(s, prevention, 0.55, 1.8, 7.3, 5.2, size=14, bullet_color=ACCENT_TEAL)

rect(s, 8.1, 1.15, 5.0, 5.9, RGBColor(0xF3, 0xE5, 0xF5))
tb(s, "Clinical Consequences\nof Processing Errors", 8.25, 1.2, 4.7, 0.8, 17, bold=True, color=DARK_BLUE)
consequences = [
    ("Porosity", "→ Plaque retention, Candida colonization, fracture"),
    ("Shrinkage", "→ Poor retention, rocking, tissue damage"),
    ("OVD increase", "→ TMJ pain, muscle fatigue, clicking"),
    ("Residual monomer", "→ Stomatitis, allergy, tissue damage"),
    ("Warpage", "→ Occlusal imbalance, sore spots"),
    ("Crazing", "→ Fracture lines, poor esthetics"),
    ("Poor fit", "→ Ulcers, bone resorption acceleration"),
]
for i, (cause, effect) in enumerate(consequences):
    bg = RGBColor(0xFF,0xFF,0xFF) if i%2==0 else RGBColor(0xEE,0xDD,0xFF)
    rect(s, 8.1, 2.1+i*0.72, 5.0, 0.65, bg)
    tb(s, cause, 8.2, 2.15+i*0.72, 1.5, 0.55, 13.5, bold=True, color=RGBColor(0x6A,0x1B,0x9A))
    tb(s, effect, 9.8, 2.15+i*0.72, 3.1, 0.55, 13, color=TEXT_DARK)

rect(s, 8.1, 7.0, 5.0, 0.0, WHITE)  # filler

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 17 – COMPARISON TABLE
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Summary Comparison Table — Processing Errors", 17)

headers = ["Error", "Cause", "Location / Appearance", "Prevention"]
col_w = [2.5, 3.5, 3.8, 3.0]
col_x = [0.4]
for w in col_w[:-1]:
    col_x.append(col_x[-1]+w+0.05)

# header row
for j, (h, w, x) in enumerate(zip(headers, col_w, col_x)):
    rect(s, x, 1.2, w, 0.55, DARK_BLUE)
    tb(s, h, x+0.1, 1.25, w-0.15, 0.45, 15, bold=True, color=WHITE)

rows = [
    ["Gaseous Porosity", "Monomer volatilization above 100.6°C; excess monomer; exothermic reaction", "Internal round voids in THICK sections", "74°C cure cycle; correct P:L ratio"],
    ["Contraction Porosity", "Polymerization volumetric shrinkage; no monomer supply to bulk", "Irregular voids in bulk/thick areas", "Adequate packing pressure; correct P:L"],
    ["Granular Porosity", "Excess powder (P:L too high); inadequate monomer wetting", "Chalky/frosty THIN sections", "Correct P:L ratio; slow mixing"],
    ["Dimensional Change", "Polymerization shrinkage; thermal contraction on cooling", "Overall denture shrinks 0.2-0.5% linearly", "Slow cooling; water sorption compensation"],
    ["Residual Monomer", "Incomplete cure; short curing cycle; self-cure resin", "Distributed throughout resin", "Correct cycle; post-cure boiling water"],
    ["Processing Strains / Warpage", "Rapid cooling; non-uniform polymerization", "Distortion after deflasking", "Slow bench cooling; gradual temperature change"],
    ["Crazing", "Internal stresses + solvent attack (acetone, alcohol)", "Surface micro-crack network", "Slow cooling; avoid alcohol mouthwashes"],
]

row_colors = [RGBColor(0xFF,0xFF,0xFF), RGBColor(0xF0,0xF7,0xFF)]
for i, row in enumerate(rows):
    y = 1.8 + i * 0.77
    for j, (cell, w, x) in enumerate(zip(row, col_w, col_x)):
        rect(s, x, y, w, 0.72, row_colors[i%2])
        txt_color = ACCENT_TEAL if j==0 else TEXT_DARK
        bld = (j==0)
        tb(s, cell, x+0.08, y+0.06, w-0.12, 0.62, 12.5, color=txt_color, bold=bld, wrap=True)

# ════════════════════════════════════════════════════════════════════════════
#  SLIDE 18 – SUMMARY & KEY TAKEAWAYS
# ════════════════════════════════════════════════════════════════════════════
s = prs.slides.add_slide(blank)
std_chrome(s, "Summary & Key Takeaways", 18)

rect(s, 0.4, 1.15, 12.5, 0.7, DARK_BLUE)
tb(s, '"Understanding processing errors is the first step to delivering a well-fitting, durable, and biocompatible denture."',
   0.6, 1.2, 12.2, 0.6, 14.5, italic=True, color=GOLD, align=PP_ALIGN.CENTER)

takeaways = [
    ("PMMA remains the gold standard", "Despite newer materials, PMMA is still the most widely used denture base due to esthetics, ease of processing, and repairability."),
    ("Porosity is the most common error", "Gaseous (thick areas, T > 100.6°C) and granular (excess powder) are the two major types — both preventable."),
    ("Shrinkage is inevitable but manageable", "6-7% volumetric / 0.2-0.5% linear. Water sorption partially compensates. Slow cooling is key."),
    ("Residual monomer = biocompatibility risk", "Heat-cure has least residual. Post-cure in boiling water for 30 min before delivery is best practice."),
    ("Processing strains → warpage & crazing", "Always bench cool slowly. Advise patients to avoid alcohol-based mouthwashes."),
    ("Correct dough stage = optimal outcome", "Dough stage: non-sticky, homogeneous, does not adhere to glass. Never pack at sandy or rubbery stage."),
]

for i, (heading, body) in enumerate(takeaways):
    col = i % 2
    row = i // 2
    cx = 0.4 + col * 6.4
    cy = 2.0 + row * 1.7
    bar_color = [ACCENT_TEAL, MED_BLUE, GOLD, RGBColor(0xE53935), RGBColor(0x6A,0x1B,0x9A), DARK_BLUE][i]
    rect(s, cx, cy, 0.3, 1.5, bar_color)
    rect(s, cx+0.3, cy, 5.8, 1.5, WHITE)
    tb(s, heading, cx+0.45, cy+0.1, 5.5, 0.5, 15, bold=True, color=bar_color)
    tb(s, body, cx+0.45, cy+0.6, 5.5, 0.85, 13, color=TEXT_DARK, wrap=True)

rect(s, 0.4, 7.08, 12.5, 0.38, DARK_BLUE)
tb(s, "Reference: Phillips' Science of Dental Materials — Chapter on Denture Base Polymers | BDS 2nd Year Seminar",
   0.6, 7.1, 12.2, 0.35, 12.5, color=GOLD, italic=True, align=PP_ALIGN.CENTER)

# ════════════════════════════════════════════════════════════════════════════
#  SAVE
# ════════════════════════════════════════════════════════════════════════════
out = "/tmp/workspace/denture-ppt/Processing_Errors_Denture_Base_Resins.pptx"
buf = BytesIO()
prs.save(buf)
with open(out, "wb") as f:
    f.write(buf.getvalue())
print(f"Saved: {out}")
print(f"Slides: {len(prs.slides)}")