**Topic:** clasiffy dental waxes explain properties and origin uses **Reference:** philps **Format/Marks:** 15 marks Give me a **BDS university-exam-oriented answer** according to the reference, in **very easy language**, following the format/marks I specify. Include **important headings, classifications, tables, examples, mnemonics, flowcharts, and simple hand-drawn-style diagrams** wherever useful, and generate **PNG flowcharts/diagrams** when they would help. End with **⭐ high-yield points, quick revision, likely viva questions, and the most important points to write in the exam**.

Reading File

Finding Sources

Running Command

mkdir -p /tmp/workspace/dental-waxes && ls /tmp/workspace/dental-waxes/

Running Command

python3 << 'EOF' import matplotlib.pyplot as plt import matplotlib.patches as mpatches from matplotlib.patches import FancyBboxPatch, FancyArrowPatch import matplotlib.patheffects as pe import numpy as np fig, ax = plt.subplots(figsize=(18, 14)) ax.set_xlim(0, 18) ax.set_ylim(0, 14) ax.axis('off') fig.patch.set_facecolor('#FFFDF5') def box(ax, x, y, w, h, text, facecolor, edgecolor='#333333', fontsize=10, bold=False, radius=0.3): fancy = FancyBboxPatch((x - w/2, y - h/2), w, h, boxstyle=f"round,pad=0.1,rounding_size={radius}", linewidth=1.5, edgecolor=edgecolor, facecolor=facecolor, zorder=3) ax.add_patch(fancy) weight = 'bold' if bold else 'normal' ax.text(x, y, text, ha='center', va='center', fontsize=fontsize, fontweight=weight, color='#1a1a1a', zorder=4, wrap=True, multialignment='center') def arrow(ax, x1, y1, x2, y2, color='#555555'): ax.annotate('', xy=(x2, y2), xytext=(x1, y1), arrowprops=dict(arrowstyle='->', color=color, lw=1.8)) # Title ax.text(9, 13.3, 'CLASSIFICATION OF DENTAL WAXES', ha='center', va='center', fontsize=16, fontweight='bold', color='white', bbox=dict(boxstyle='round,pad=0.5', facecolor='#2C5F8A', edgecolor='#1a3d5c', linewidth=2)) ax.text(9, 12.5, '(Phillips\' Science of Dental Materials)', ha='center', va='center', fontsize=11, fontstyle='italic', color='#555555') # Main node box(ax, 9, 11.5, 3.2, 0.75, 'DENTAL WAXES', '#2C5F8A', '#1a3d5c', fontsize=13, bold=True) # White text override ax.texts[-1].set_color('white') # 3 main branches branch_colors = ['#E8724A', '#4A9E6B', '#7B5EA7'] branches = ['PATTERN WAXES', 'PROCESSING WAXES', 'IMPRESSION WAXES'] bx = [3.5, 9, 14.5] by = [9.5, 9.5, 9.5] for i, (bname, bcolor, x, y) in enumerate(zip(branches, branch_colors, bx, by)): arrow(ax, 9, 11.1, x, y+0.38, color='#888888') box(ax, x, y, 3.0, 0.75, bname, bcolor, bold=True, fontsize=10) ax.texts[-1].set_color('white') # Pattern wax children pattern_children = [ ('Inlay Wax\n(Type I-Direct,\nType II-Indirect)', '#F5C8B8'), ('Casting Wax\n(Thin sheets,\npartial dentures)', '#F5C8B8'), ('Baseplate Wax\n(Record rims,\ndenture bases)', '#F5C8B8'), ] px = [1.0, 3.5, 6.0] py = [7.2, 7.2, 7.2] for i, (txt, col) in enumerate(pattern_children): arrow(ax, bx[0], by[0]-0.38, px[i], py[i]+0.55, color='#E8724A') box(ax, px[i], py[i], 2.2, 1.1, txt, col, '#E8724A', fontsize=8.5) # Processing wax children proc_children = [ ('Boxing Wax\n(Pour impressions)', '#C8E6C9'), ('Utility Wax\n(Periphery wax;\nsoft, pliable)', '#C8E6C9'), ('Sticky Wax\n(Broken parts;\nhard & brittle)', '#C8E6C9'), ] px2 = [7.3, 9.0, 10.7] py2 = [7.2, 7.2, 7.2] for i, (txt, col) in enumerate(proc_children): arrow(ax, bx[1], by[1]-0.38, px2[i], py2[i]+0.55, color='#4A9E6B') box(ax, px2[i], py2[i], 2.2, 1.1, txt, col, '#4A9E6B', fontsize=8.5) # Impression wax children imp_children = [ ('Corrective\nImpression Wax\n(Low-fusing)', '#D9C8F0'), ('Bite\nRegistration Wax\n(Records occlusion)', '#D9C8F0'), ] px3 = [13.3, 15.7] py3 = [7.2, 7.2] for i, (txt, col) in enumerate(imp_children): arrow(ax, bx[2], by[2]-0.38, px3[i], py3[i]+0.55, color='#7B5EA7') box(ax, px3[i], py3[i], 2.5, 1.1, txt, col, '#7B5EA7', fontsize=8.5) # Origin section ax.text(9, 5.8, 'ORIGIN OF DENTAL WAXES', ha='center', va='center', fontsize=13, fontweight='bold', color='white', bbox=dict(boxstyle='round,pad=0.4', facecolor='#5B4A3F', edgecolor='#3a2e28', linewidth=2)) origin_data = [ ('🌿 NATURAL\nWAXES', '#FFF3CD', '#8B6914', 'Mineral: Paraffin, Ceresin, Ozokerite\nAnimal: Beeswax, Spermaceti\nVegetable: Carnauba, Candelilla, Ouricury'), ('🧪 SYNTHETIC\nWAXES', '#D1ECF1', '#0C5460', 'Polyethylene wax\nFischer-Tropsch wax\nChloronaphthalene wax\nHydrocarbon resins'), ('🏭 WAXES WITH\nADDITIVES', '#F8D7DA', '#721C24', 'Gum dammar, Gum acacia\nTurpentine, Rosin\nColorants & pigments\nFatty acids & esters'), ] ox = [3.2, 9, 14.8] for i, (title, fc, ec, desc) in enumerate(origin_data): box(ax, ox[i], 4.3, 4.5, 2.0, f'{title}\n{desc}', fc, ec, fontsize=8.2) # Footer note ax.text(9, 0.5, 'Mnemonic: "P-P-I" → Pattern | Processing | Impression', ha='center', va='center', fontsize=11, fontweight='bold', color='#2C5F8A', bbox=dict(boxstyle='round,pad=0.35', facecolor='#EEF4FF', edgecolor='#2C5F8A', linewidth=1.5)) plt.tight_layout() plt.savefig('/tmp/workspace/dental-waxes/classification_flowchart.png', dpi=150, bbox_inches='tight', facecolor='#FFFDF5') plt.close() print("Saved classification_flowchart.png") EOF

Running Command

python3 << 'EOF' import matplotlib.pyplot as plt import matplotlib.patches as mpatches from matplotlib.patches import FancyBboxPatch import numpy as np fig, axes = plt.subplots(1, 2, figsize=(18, 11)) fig.patch.set_facecolor('#FFFDF5') # ===== LEFT: Properties of Dental Waxes ===== ax = axes[0] ax.set_xlim(0, 10) ax.set_ylim(0, 14) ax.axis('off') ax.set_facecolor('#FFFDF5') ax.text(5, 13.4, 'PROPERTIES OF DENTAL WAXES', ha='center', va='center', fontsize=13, fontweight='bold', color='white', bbox=dict(boxstyle='round,pad=0.45', facecolor='#2C5F8A', edgecolor='#1a3d5c', linewidth=2)) props = [ ('1. THERMAL EXPANSION', '#FDECEA', '#C0392B', '- Waxes expand on heating\n- Coefficient: ~350 x10⁻⁶/°C\n (highest among dental materials)\n- Causes inaccuracy in castings\n- Compensated by investment expansion'), ('2. FLOW / PLASTICITY', '#FFF9E6', '#D4860A', '- Ability to deform under stress\n- Inlay wax: <1% flow at 23°C\n (Type I); <0.1% at room temp\n- Flow increases rapidly with temp\n- Desirable during pattern making'), ('3. RESIDUAL STRESS\n (Elastic Memory)', '#E8F5E9', '#2E7D32', '- Wax "remembers" prior shape\n- Distortion occurs on storage\n- Cause: internal stress during\n rapid cooling of wax pattern\n- Release by slow cooling or\n heating/reheating cycles'), ('4. THERMAL CONDUCTIVITY', '#E3F2FD', '#1565C0', '- Poor thermal conductors\n- Patient does not feel discomfort\n- Rapid surface cooling traps\n internal stresses (problem!)'), ('5. DUCTILITY &\n BRITTLENESS', '#F3E5F5', '#6A1B9A', '- Brittle at room temperature\n- Ductile near melting point\n- Thin patterns crack if handled\n carelessly at room temp'), ('6. SURFACE DETAIL\n REPRODUCTION', '#E0F7FA', '#00695C', '- Excellent reproduction at\n working temperature\n- ADA Spec No. 4 requires\n accurate surface detail\n- Smooth surface needed for\n accurate casting'), ('7. VAPORISATION\n (Burnout)', '#FFF3E0', '#E65100', '- Must burn out completely\n- Should leave no ash residue\n- Tested at 500°C - 600°C\n- Incompletely burned wax\n causes porous castings'), ] y_positions = [12.2, 10.7, 9.0, 7.5, 6.1, 4.6, 3.0] for (title, fc, ec, desc), y in zip(props, y_positions): fancy = FancyBboxPatch((0.2, y-0.55), 9.6, 1.2, boxstyle="round,pad=0.08,rounding_size=0.2", linewidth=1.5, edgecolor=ec, facecolor=fc, zorder=3) ax.add_patch(fancy) # title rect fancy2 = FancyBboxPatch((0.2, y+0.25), 9.6, 0.45, boxstyle="round,pad=0.05,rounding_size=0.15", linewidth=0, edgecolor=ec, facecolor=ec, zorder=4) ax.add_patch(fancy2) ax.text(5, y+0.47, title, ha='center', va='center', fontsize=8.5, fontweight='bold', color='white', zorder=5) ax.text(0.45, y-0.08, desc, ha='left', va='center', fontsize=7.8, color='#1a1a1a', zorder=5) # ===== RIGHT: Uses Table as visual ===== ax2 = axes[1] ax2.set_xlim(0, 10) ax2.set_ylim(0, 14) ax2.axis('off') ax2.set_facecolor('#FFFDF5') ax2.text(5, 13.4, 'USES OF DENTAL WAXES', ha='center', va='center', fontsize=13, fontweight='bold', color='white', bbox=dict(boxstyle='round,pad=0.45', facecolor='#4A7C59', edgecolor='#2d5c3d', linewidth=2)) uses_data = [ ('INLAY WAX', '#FDECEA', '#C0392B', 'Direct & indirect technique\nFabrication of inlays, onlays,\ncrowns and fixed partial dentures\n(Lost wax technique)'), ('CASTING WAX', '#FFF9E6', '#D4860A', 'Fabrication of metal frameworks\nfor removable partial dentures\nSheet wax - 0.3 to 0.5 mm thick'), ('BASEPLATE WAX', '#E8F5E9', '#2E7D32', 'Construction of record bases\nOcclusal rims for jaw relation\nTrial denture bases\nProvisional restorations'), ('BOXING WAX', '#E3F2FD', '#1565C0', 'Creating a box around impression\nPouring of dental stone/plaster\nContains cast to standard shape\nPreserves borders of impression'), ('UTILITY WAX', '#F3E5F5', '#6A1B9A', 'Periphery / tray border extension\nBleeder holes, wire holders\nModifying custom trays\nOrthod. bracket protection'), ('STICKY WAX', '#E0F7FA', '#00695C', 'Joining broken parts temporarily\nRelating casts to articulators\nAssembling fragile appliances\nHard & brittle - low temp fusion'), ('CORRECTIVE\nIMPRESSION WAX', '#FFF3E0', '#E65100', 'Secondary impression over copper\nband or functional impression\nCopper band wax impression\nLow fusing; flows easily'), ('BITE REGISTRATION\nWAX', '#F8F4FF', '#5B4A9E', 'Recording centric occlusion\nHorse-shoe shape sheet wax\nRecording jaw relations\nHigh-fusing type'), ] y2_pos = [12.2, 10.85, 9.5, 8.15, 6.8, 5.45, 4.0, 2.5] for (title, fc, ec, desc), y in zip(uses_data, y2_pos): fancy = FancyBboxPatch((0.2, y-0.5), 9.6, 1.1, boxstyle="round,pad=0.08,rounding_size=0.18", linewidth=1.5, edgecolor=ec, facecolor=fc, zorder=3) ax2.add_patch(fancy) fancy2 = FancyBboxPatch((0.2, y+0.25), 9.6, 0.38, boxstyle="round,pad=0.05,rounding_size=0.12", linewidth=0, edgecolor=ec, facecolor=ec, zorder=4) ax2.add_patch(fancy2) ax2.text(5, y+0.44, title, ha='center', va='center', fontsize=8.3, fontweight='bold', color='white', zorder=5) ax2.text(0.45, y-0.05, desc, ha='left', va='center', fontsize=7.7, color='#1a1a1a', zorder=5) plt.tight_layout(pad=1.5) plt.savefig('/tmp/workspace/dental-waxes/properties_uses.png', dpi=150, bbox_inches='tight', facecolor='#FFFDF5') plt.close() print("Saved properties_uses.png") EOF

Here is your complete BDS university exam answer on Dental Waxes (15 marks), based on Phillips' Science of Dental Materials.

DENTAL WAXES

(Phillips' Science of Dental Materials)

(15 Marks Answer)

INTRODUCTION

Dental waxes are a group of thermoplastic materials derived from natural, synthetic, or modified hydrocarbon sources. They are solid at room temperature but soften and become plastic on heating. Because they can be molded, carved, and removed without residue, they are indispensable at every stage of dental laboratory and clinical work.

DEFINITION

"Dental waxes are mixtures of natural and/or synthetic wax-like substances which at room temperature are solid, but become soft and malleable on gentle warming."

Phillips' Science of Dental Materials

CLASSIFICATION OF DENTAL WAXES

Easy Mnemonic: "PPI"

P	P	I
Pattern Waxes	Processing Waxes	Impression Waxes

DETAILED CLASSIFICATION TABLE

Category	Type	Example	ADA Spec.
Pattern Waxes	Inlay wax	Type I (Direct), Type II (Indirect)	No. 4
	Casting wax	Sheet casting wax	No. 4
	Baseplate wax	Hard, Medium, Soft grades	No. 24
Processing Waxes	Boxing wax	Periphery boxing	-
	Utility wax	Periphery / tray wax	-
	Sticky wax	Shellac + beeswax blend	-
Impression Waxes	Corrective impression wax	Korecta-wax, Iowa wax	No. 18
	Bite registration wax	Aluwax, Delar wax	-

ORIGIN / COMPOSITION OF DENTAL WAXES

1. Natural Waxes

a) Mineral Waxes (most commonly used)

Wax	Source	Melting Point	Key Use
Paraffin wax	Petroleum distillation	42-68°C	Base of most dental waxes
Ceresin	Purified ozokerite	61-78°C	Replaces beeswax
Ozokerite	Earth/fossil wax	55-80°C	Added to baseplate wax
Microcrystalline wax	Petroleum residue	60-90°C	Improves flexibility

b) Animal Waxes

Wax	Source	Melting Point	Key Use
Beeswax	Honeycomb of bees	63-70°C	Sticky wax; softens other waxes
Spermaceti	Sperm whale oil	42-47°C	Smooth texture; largely obsolete

c) Vegetable Waxes

Wax	Source	Melting Point	Key Use
Carnauba wax	Copernicia cerifera palm	84-91°C	Raises melting point of mixture
Candelilla wax	Euphorbia plant	67-79°C	Alternative to carnauba
Ouricury wax	Brazilian palm	79-84°C	Similar to carnauba

Exam Tip: Carnauba wax has the HIGHEST melting point among vegetable waxes. It is added to RAISE the melting point and REDUCE flow of the wax mixture.

2. Synthetic Waxes

Polyethylene wax
Fischer-Tropsch wax (from coal hydrogenation)
Chlorinated naphthalene wax
Acrawax (N,N'-ethylene bis-stearamide)

Synthetic waxes provide more uniform properties and better control of flow.

3. Wax Additives

Additive	Purpose
Gum dammar / Rosin	Improve surface hardness
Turpentine	Modify plasticity
Fats / fatty acids	Smooth texture
Colorants	Identification of wax type

PROPERTIES OF DENTAL WAXES

1. Thermal Expansion (Most Important Property)

Waxes have the highest coefficient of thermal expansion among all dental materials
Range: ~250-450 x 10⁻⁶ per °C (vs. ~11 x 10⁻⁶ for gold alloy)
This causes dimensional change in wax patterns
Compensated by: (a) investment expansion, (b) hygroscopic expansion

Clinical Relevance: A wax inlay pattern expanded at oral temperature (37°C) vs. room temperature can cause inaccurate castings.

2. Flow (Plasticity)

Flow = % deformation under load for 10 minutes at set temperature

ADA Spec No. 4 for Inlay Wax:
  - Type I (Direct):  ≤ 1.0% flow at 37°C
                      ≥ 70% flow at 45°C
  - Type II (Indirect): ≤ 0.6% flow at 37°C

Flow is low at room temp (good - won't distort in hands)
Flow is high at oral temp (good - adapts to cavity preparation)
Flow increases sharply as temperature rises

3. Residual Stress / Elastic Memory

When wax is manipulated and cooled rapidly, internal stresses are "locked in"
On storage or reheating, these stresses release → distortion of pattern
This is called "elastic memory" or "residual stress"
Prevention: Allow slow, uniform cooling; avoid sudden temperature changes

4. Thermal Conductivity

Waxes are poor conductors of heat
Advantage: Comfortable for patient during impression
Disadvantage: Surface cools rapidly; inside remains hot - causes internal stress

5. Vaporization / Burnout

Waxes must completely vaporize at investment burnout temperatures (500-600°C)
No carbonaceous residue should remain
Incomplete burnout → porous castings

6. Surface Detail Reproduction

Excellent surface detail at working temperature
ADA requires adequate reproduction under Spec No. 4

7. Ductility / Brittleness

Brittle at room temperature → thin patterns may crack
Ductile near softening point

INDIVIDUAL WAXES - ORIGIN & USES

A. PATTERN WAXES

1. Inlay Wax

Feature	Details
Composition	Paraffin (60%), carnauba, ceresin, beeswax
ADA Spec	No. 4
Types	Type I - Direct technique (harder, higher flow at 37°C)
	Type II - Indirect technique (softer)
Colors	Blue, green (easy to see contrast on die)
Uses	Wax pattern for inlays, onlays, crowns, bridges (Lost wax technique)
Key Property	Low flow at 37°C to prevent distortion in mouth

2. Casting Wax

Feature	Details
Forms	Sheets (0.3-0.5 mm thick), wires, half-round shapes
Composition	Paraffin, carnauba, ceresin
Uses	Metal framework wax patterns for removable partial dentures
ADA Spec	No. 4

3. Baseplate Wax

Feature	Details
Composition	Paraffin (75-80%), carnauba, beeswax, ceresin
Grades	Soft (tropical), Medium (normal), Hard
ADA Spec	No. 24
Uses	- Occlusal rims / record bases
	- Trial denture bases
	- Establishing jaw relations
	- Provisional restorations
Colors	Pink (mimics gingival color for esthetics)

B. PROCESSING WAXES

4. Boxing Wax

Feature	Details
Form	Thin strip, ~150 mm x 38 mm
Composition	Soft, low-fusing wax
Uses	Creating walls ("box") around impression before pouring stone
Purpose	Standardize shape and height of cast, preserve borders

5. Utility Wax (Periphery Wax)

Feature	Details
Composition	Petrolatum, beeswax, soft pliable mixture
Form	Rope/stick form
Uses	- Extending tray borders
	- Orthodontic bracket protection
	- Modifying trays for comfort
Key Property	Very soft and pliable at room temperature

6. Sticky Wax

Feature	Details
Composition	Beeswax + shellac (or rosin)
Melting Point	~65-70°C
Property	Hard & brittle at room temp; very sticky when melted
Uses	- Reassembling broken parts
	- Relating casts to articulators
	- Joining metal parts temporarily
Important	Should not be used near soft tissues (burns)

C. IMPRESSION WAXES

7. Corrective Impression Wax

Feature	Details
Composition	Low-fusing wax blends
ADA Spec	No. 18
Flow	Very high flow at body temperature
Uses	- Wash impression over copper bands
	- Functional (mucocompressive) impressions
	- Secondary wash impressions for edentulous cases
Examples	Korecta-Wax No. 4, Iowa Wax

8. Bite Registration Wax

Feature	Details
Form	Horseshoe-shaped sheet or strips
Composition	Aluminum-reinforced wax (Aluwax), or beeswax-based
Property	Relatively rigid; low flow after recording
Uses	- Recording centric occlusion
	- Recording eccentric jaw relations
- Transferring casts to articulator
Examples	Aluwax, Delar wax, Beauty-Pink Baseplate Wax

QUICK REVISION FLOWCHART - IMPORTANT NUMBERS

┌─────────────────────────────────────────────────────────┐
│           KEY NUMBERS TO REMEMBER                       │
├────────────────────────┬────────────────────────────────┤
│ Inlay wax (Type I)     │ ≤ 1% flow at 37°C              │
│ Inlay wax (Type I)     │ ≥ 70% flow at 45°C             │
│ Inlay wax (Type II)    │ ≤ 0.6% flow at 37°C            │
│ Thermal expansion      │ 250-450 × 10⁻⁶ /°C            │
│ Burnout temperature    │ 500-600°C                       │
│ Baseplate wax ADA      │ Specification No. 24            │
│ Inlay/Casting wax ADA  │ Specification No. 4             │
│ Corrective imp. wax    │ Specification No. 18            │
│ Carnauba melting pt    │ 84-91°C (highest vegetable wax) │
│ Paraffin melting pt    │ 42-68°C                         │
└────────────────────────┴────────────────────────────────┘

MNEMONICS

1. Classification - "PPI"

Pattern waxes, Processing waxes, Impression waxes

2. Pattern Waxes - "I C B"

Inlay + Casting + Baseplate

3. Processing Waxes - "BUS"

Boxing + Utility + Sticky

4. Impression Waxes - "CB"

Corrective impression + Bite registration

5. Origin of Waxes - "MAS"

Mineral + Animal + Synthetic/vegetable

6. Properties - "TERRAFORM"

Thermal expansion Elastic memory Residual stress Residue (burnout) Adhesion (sticky) Flow Odor-free Reproduction of detail Melting point

COMPARISON TABLE - Pattern vs. Processing vs. Impression Waxes

Feature	Pattern	Processing	Impression
Purpose	Make wax pattern for casting	Assist laboratory/clinical procedures	Record tissue/occlusal forms
Accuracy	Highest required	Moderate	Highest required
Flow	Controlled, low at 37°C	High (utility), low (sticky)	High at body temp
Burnout	Complete, no residue	Not cast	Not cast
Examples	Inlay, Casting, Baseplate	Boxing, Utility, Sticky	Corrective, Bite reg.

⭐ HIGH-YIELD POINTS FOR EXAM

Paraffin wax is the main constituent of all dental waxes (60-75%)
Carnauba wax - highest melting point vegetable wax; raises melting point of mixture; derived from Copernicia cerifera
Thermal expansion - single most important property of dental wax; highest coefficient among all dental materials
Flow - ability of wax to deform under stress; increases rapidly with temperature; tested per ADA Spec No. 4
Residual stress - internal stress locked in by rapid cooling; released during storage - causes distortion
Inlay wax - ADA Spec No. 4; Type I for direct, Type II for indirect; low flow at 37°C is mandatory
Baseplate wax - ADA Spec No. 24; three grades; mainly used for occlusal rims and jaw records
Sticky wax - contains shellac + beeswax; hard at room temp, sticky when molten; used to join broken parts
Utility wax - softest dental wax; pliable at room temperature; used for tray border extension
Burnout - wax must leave zero ash residue; incomplete burnout causes porosity in castings
Corrective impression wax - ADA Spec No. 18; high flow at body temperature; used for wash impressions

LIKELY VIVA / SHORT QUESTIONS

Question	Answer (1 line)
What is the base of all dental waxes?	Paraffin wax
Which wax has highest melting point?	Carnauba wax (84-91°C)
What is ADA Spec for inlay wax?	No. 4
What is ADA Spec for baseplate wax?	No. 24
What is flow of Type I inlay wax at 37°C?	≤ 1%
Why are wax patterns distorted?	Residual/internal stress (elastic memory)
What is Aluwax used for?	Bite registration
What is utility wax also called?	Periphery wax / tray border wax
Why add carnauba to dental wax?	Raises melting point, reduces flow
What is sticky wax made of?	Beeswax + shellac (or rosin)
What temperature is wax burned out?	500-600°C
What is the source of beeswax?	Honeycomb of bees

IMPORTANT POINTS TO WRITE IN EXAM (Score Maximizers)

Define dental wax at the start (always gets marks)
Classify using the PPI system with a table (3-4 marks secured immediately)
Origin - always divide into Mineral > Animal > Vegetable > Synthetic with melting points
Properties - always mention thermal expansion first (it is the most important); then flow, residual stress, burnout
ADA Specification numbers - examiners look for these (No. 4, No. 18, No. 24)
Flow values for inlay wax (numerical values impress examiners)
Carnauba wax deserves special mention under composition with its source and function
Lost wax technique - mention it when writing uses of inlay/casting wax
Include the comparison table of Pattern vs. Processing vs. Impression waxes
End with a summary line about the clinical significance of managing thermal expansion and residual stress

Reference: Phillips' Science of Dental Materials (Anusavice KJ, Shen C, Rawls HR) - Chapter on Dental Waxes

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