CRP of 135 mg/L in Canine Space Infection

What the Value Means

Clinical Significance in Context

1. Confirms Active Bacterial Infection

• Active odontogenic bacterial infection (typically mixed aerobic-anaerobic flora, often streptococcal + staphylococcal + anaerobes)
• The body is mounting a full acute-phase response via IL-6 - driven hepatic CRP synthesis

2. Severity Classification

3. Canine Space is a "Low-Severity" Space - But 135 mg/L is Disproportionately High

• Infection may be spreading beyond the canine space (e.g., toward the buccal space or infraorbital region)
• Possible incipient cavernous sinus thrombosis - the major feared complication of canine space infection, as the canine space has direct communication pathways to cavernous sinus via the angular/ophthalmic veins
• Underlying comorbidity (diabetes, immunocompromise) amplifying the inflammatory response
• Delayed presentation with established abscess formation

4. CRP as a Treatment Monitoring Tool

• Day 0: Elevated (e.g., 135 mg/L)
• Day 2: Should fall by ~50% (to ~60-70 mg/L)
• Day 5: Should approach near-normal (~5-15 mg/L)

Clinical Actions Indicated by CRP 135 mg/L

1. Imaging - CT with contrast of the face/neck to delineate abscess extent and rule out spread to buccal, infraorbital, or intracranial spaces
2. Incision & Drainage - Canine space is accessed via an intraoral incision above the upper lip in the canine fossa region
3. IV antibiotics - Amoxicillin-clavulanate or clindamycin; escalate to piperacillin-tazobactam if spreading or diabetic
4. Serial CRP monitoring - Repeat at 48 hours to confirm treatment response
5. Watch for cavernous sinus signs - Periorbital edema, chemosis, proptosis, ophthalmoplegia, high fever

Summary

Mesiodistal Fracture of Tooth in RCT-Treated Teeth

Definition and Classification

1. Craze line - enamel only, no symptoms
2. Fractured cusp - extends into dentin
3. Cracked tooth - incomplete, not through-and-through
4. Split tooth - complete, tooth halved into two segments
5. Vertical root fracture - begins in root, extends coronally (this is what occurs in RCT teeth)

Why RCT-Treated Teeth Are Especially Vulnerable

1. Dentin Dehydration and Embrittlement

• Loss of pulp eliminates hydraulic buffering and nutritional supply to odontoblasts
• Collagen cross-linking in root dentin changes after devitalization
• Dehydration increases Young's modulus (stiffness) - the tooth becomes brittle and less able to flex under load
• (Sedgley & Messer, 1992: endodontically treated teeth are NOT weaker in ultimate strength but show more brittle fracture behavior)

2. Loss of Tooth Structure

• Access cavity preparation removes the protective roof of the pulp chamber, especially the triangular ridges
• Over-instrumentation widens canals, thinning the dentinal walls
• The mesiodistal dimension of roots is inherently narrower than the buccolingual, making them susceptible when further dentine is removed
• Post space preparation dramatically concentrates stress at mid-root

3. Iatrogenic Factors During RCT

• Lateral condensation of gutta-percha - the most commonly implicated cause; hydraulic wedging forces directed laterally split roots mesiodistally
• Excessive obturation pressure - particularly with solid core systems
• Oversized spreaders/pluggers - tip diameter too large for the apical canal creates wedge stress
• Overzealous step-back or flaring - thinning of canal walls

4. Anatomical Predisposition

• Mesial roots of mandibular molars (narrow mesiodistal width with developmental depressions)
• Buccal roots of maxillary premolars (bifurcated, narrow mesiodistally)
• Mandibular premolars and maxillary lateral incisors are also at higher risk

5. Post-RCT Restoration Factors

• Unprotected RCT teeth (no crown) are at very high risk
• Poorly fitting posts or posts with excessive taper concentrate stress at critical zones
• Parafunctional habits (bruxism) on RCT teeth without cuspal coverage are a major precipitating factor

Clinical Features

Diagnosis

Radiographic Signs

• Lateral radiolucency along the root surface (not just periapical)
• "Halo" appearance - diffuse bone loss surrounding the entire root
• Angular bone loss at the crestal or mid-root level
• Fracture line itself is often not visible on 2D X-ray, especially in early stages

Note: Standard periapical radiographs primarily image the mesiodistal plane, so a mesiodistal fracture may be invisible on PA X-rays - the fracture line is parallel to the beam.

CBCT (Gold Standard)

• CBCT is the most reliable diagnostic tool for VRF, especially mesiodistal ones
• Shows the fracture line directly in axial cross-sections
• Accuracy is affected by metallic posts (scatter artifact) - metal artifact reduction (MAR) filters improve sensitivity
• A 2024 systematic review (PMC12303641) confirmed CBCT superiority over 2D imaging for VRF detection

Clinical Probing Test

• A narrow, isolated periodontal pocket (often 6-10 mm deep) on one surface only, with normal probing elsewhere = classic VRF sign
• Use a fine explorer or transillumination light to detect coronal crack extension

Staining

• Methylene blue dye applied after flap reflection can highlight the fracture line at surgery

Iowa Staging Index (Cracked Teeth / VRF Prognosis)

Management

Single-Rooted Teeth

• Prognosis is almost always hopeless - extraction is the standard treatment
• Attempted repairs (bonding with resin, MTA, biodentine) have been reported but long-term outcomes are poor and unpredictable

Multi-Rooted Teeth (Molars/Premolars)

Prevention (Most Important)

1. Crown all RCT posterior teeth - especially premolars and molars; cuspal coverage is mandatory
2. Avoid lateral condensation in curved or narrow canals; use warm vertical or single cone techniques
3. Use spreaders/pluggers appropriate to canal size - never force oversized instruments
4. Minimize access cavity extension - conservative endodontic access (ninja access, guided endodontics)
5. Avoid large posts in narrow mesiodistal roots (mesial roots of lower molars, buccal roots of upper premolars)
6. Nightguard for bruxers with multiple RCT teeth

Summary

Vertical Root Fracture (VRF) - Complete Clinical Review

Definition

Classification of Tooth Fractures (Context)

Incidence

• VRF accounts for ~2-5% of all tooth fractures
• Among endodontically treated teeth, incidence ranges from 4% to 32%
• 80% of VRFs are detected within 2 years of symptom onset
• Most common in: mandibular molars (mesial root), maxillary premolars (buccal root), mandibular premolars

Etiology and Predisposing Factors

A. Iatrogenic (Most Common in RCT Teeth)

B. Patient and Tooth Factors

Clinical Features

Key Clinical Signs (See et al., 2019 - most associated signs):

Note: The isolated, narrow probing defect with normal probing elsewhere is the single most important clinical clue.

Radiographic Features

Radiographic Signs to Look For:

CBCT - Gold Standard

• Provides 3D axial cross-sections that visualize the fracture line directly
• Significantly superior to periapical radiography for VRF detection
• A 2023 systematic review and meta-analysis (de Lima et al., Clin Oral Investig, PMID 36700991) confirmed that CBCT acquisition parameters significantly affect diagnostic accuracy
• Limitations: metallic posts cause scatter artifacts that obscure the fracture - use metal artifact reduction (MAR) filters
• Small field of view (FOV) + high resolution + thin slices = best protocol

Diagnosis Protocol

1. Identify susceptible teeth - RCT teeth with posts, narrow roots, posterior teeth in bruxers
2. History - When was RCT done? Any previous symptoms? Repeated treatment?
3. Clinical exam - Percussion test (vertical + lateral), palpation, periodontal probing (all surfaces, note isolated pockets)
4. Sinus tract tracing - Insert GP cone into sinus tract before X-ray to trace its origin
5. Radiographs - PA in 2+ angulations; look for halo/lateral bone loss
6. CBCT - If clinical suspicion is high but 2D inconclusive
7. Transillumination - Fiber optic light to detect coronal crack extension
8. Staining tests - Methylene blue dye after flap reflection highlights the fracture line
9. Exploratory surgery - Flap raised to directly visualize the root surface; definitive diagnosis

Differential Diagnosis

• Failed endodontic treatment (periapical pathology without lateral bone loss)
• Localized periodontitis (multiple surfaces involved, plaque-related)
• Endo-perio lesion (probing all around, not just one narrow defect)
• Cemental tear (a separate entity; can also cause bone loss; distinguished by CBCT or surgery)
• Root perforation (usually identifiable by location and history)
• External root resorption

Iowa Staging Index (Prognosis of Cracked Teeth / Early VRF)

Management

Single-Rooted Teeth

• Prognosis is hopeless in most cases
• Extraction is the standard treatment
• Implant placement after adequate healing is the preferred replacement option
• Experimental options (resin bonding, MTA, biodentine, intentional replantation) have been reported but lack long-term predictability

Multi-Rooted Teeth

Prevention

Summary

Left Atrial Appendage (LAA) - Complete Clinical Overview

Anatomy

• Located near the free wall of the left ventricle, within the pericardium
• Long, tubular, hooked structure with pectinate (crenellated) muscles inside
• Has a narrow junction (ostium) with the left atrium - unlike the right atrial appendage which is broad and triangular
• The ostium can be: oval (69%), foot-like (10%), triangular (8%), teardrop (8%), round (6%)
• Anatomical components: ostium → neck → body → tip

LAA Morphology (4 Types) - Stroke Risk Significance

Normal Physiology of the LAA

1. Natriuretic peptide secretion - releases Atrial Natriuretic Peptide (ANP) and BNP in response to increased atrial pressure/volume, regulating fluid balance and blood pressure
2. Pressure relief valve - its compliance accommodates sudden rises in left atrial pressure (e.g., during exercise or tachycardia)
3. Reservoir function - acts as a buffer during systole when the mitral valve is closed

Note: After LAA occlusion/closure, ANP levels can drop, which has implications for fluid balance post-procedure.

The LAA and Thromboembolism

Why the LAA is Prone to Thrombus in AF:

TEE (Transoesophageal Echocardiography) Findings in LAA Thrombus:

• Spontaneous echo contrast (SEC) = "smoke" appearance - reflects sluggish flow; precursor to thrombus
• LAA thrombus = echogenic mass within the LAA
• Reduced LAA emptying velocity (< 20 cm/s) = major predictor of thrombus risk
• TEE is the gold standard before cardioversion and before LAAO procedures

CHA₂DS₂-VASc Score - Stroke Risk Assessment in AF

• Score 0 (men) / 1 (women): anticoagulation not recommended
• Score ≥ 2 (men) / ≥ 3 (women): anticoagulation recommended
• Higher scores → consider LAAO if anticoagulation not tolerated

Stroke Prevention Strategies Targeting the LAA

1. Anticoagulation (First-line)

2. LAA Occlusion (LAAO) - for Anticoagulation-Ineligible Patients

A. Percutaneous/Transcatheter LAAO

B. Surgical LAA Occlusion/Amputation (Concomitant Cardiac Surgery)

• Performed during CABG, valve surgery, or Maze procedure
• Methods: amputation, stapling, epicardial clip (AtriClip, Penditure)
• LAAOS III Trial (2021): LAA occlusion during cardiac surgery in AF patients with CHA₂DS₂-VASc ≥ 2 significantly reduced ischemic stroke/systemic embolism vs. standard care over ~4 years - benefit was additive to anticoagulation
• Per Goldman-Cecil: "epicardial closure of the LAA can significantly reduce the risk of ischemic stroke or systemic embolism compared with anticoagulation alone"
• A 2024 meta-analysis confirmed reduced stroke at early AND long-term follow-up with concomitant surgical LAAO (benefit limited to patients with preoperative AF)

LAA and Catheter Ablation for AF

• LAA isolation (electrical) can be added to PVI in resistant AF cases
• Risk: LAA isolation may impair LAA mechanical function → increases thrombus risk → permanent LAA occlusion may be needed if electrical isolation is performed

Summary Table

IMAGE 1 - OMFS Clinical Note (03/03/22)

Chief Complaint (C/C)

Past Medical History (PMH)

• NKH = No Known History (of allergies/other illness)
• H/O surgery for heart - specifically:
  • DVR = Double Valve Replacement (mitral + aortic, or similar)
  • TV Repair = Tricuspid Valve Repair
  • Done 8 years back
• Current Medications:
  • Digoxin (heart rate control - likely for AF or heart failure)
  • Tab Warfarin 5 mg (anticoagulant - mandatory after mechanical valve replacement)
  • Tab Furosemide + Amiloride (loop diuretic + potassium-sparing diuretic - for fluid management/heart failure)
  • Tab Myoxin 0.125 mg (Digoxin brand - same as above, or low-dose separate entry)
  • Tab Frusi (Furosemide) 20 mg

On Examination (O/E)

• Decayed: Tooth 65 | Tooth 68 with pit (↓RS = root surface/radicular surface involvement)
• Missing, Restored, Mobile: Charted but specific teeth not fully legible

Investigation

• OPG (Orthopantomogram - full dental panoramic X-ray) - already done

IMAGE 2 - Medicine OPD Consultation Note (Unit II)

Summary of Cardiac History

• S/P DVR (Status Post Double Valve Replacement) - 8 years back - done at SGNHC, Bansbari, Kathmandu
• + TV Repair (Tricuspid Valve Repair)
• + LAA Exclusion (Left Atrial Appendage Exclusion - surgically excluded at the time of cardiac surgery to prevent stroke/thromboembolism - this connects directly to your previous question about LAA!)
• Vitals: BP 110/80, HR 68 bpm

Diagnosis

• Severe MS (Mitral Stenosis)
• S'AR (Significant/Severe Aortic Regurgitation)
• S'PR (Significant Pulmonary Regurgitation)
• S'TR, S'PAR (Significant Tricuspid Regurgitation, Pulmonary AR)

Dental Findings for this Consultation

• Planned for OPG removal of tooth with:
  • Periapical abscess (tooth 6 area)
  • Apical periodontitis (tooth 6)
  • Proximal caries (teeth 5 to 7)

Coagulation Status

• PT = 24.6 (elevated, as expected on warfarin)
• INR = 2.46 (therapeutic range for mechanical valves is 2.5-3.5)

Current Medications (D/H = Drug History)

• T. Farin (Warfarin) 5 mg x 3 days / 2.5 mg x 4 days (alternating dose regimen)
• T. Amilax 1 tab OD (Amiloride-containing diuretic)
• T. Myoxin 0.125 mg OD (Digoxin) - given 6 days/week (omit on day 7)
• T. TOR 20 mg OD (Furosemide/Torasemide - crossed out, stopped)
• T. Pancare DSR 1 tab OD (Pantoprazole gastric protection)

IMAGE 3 - Cardiology Bridging Anticoagulation Protocol Letter

WHY BRIDGING IS NEEDED

PREOPERATIVE PROTOCOL

POSTOPERATIVE PROTOCOL

Continue Throughout

• T. Amilax 1 tab OD
• T. Lanoxin (Digoxin) 0.125 mg OD - 6 days/week (omit day 7)
• Pantoprazole (Pancare DSR) 1 tab OD

Dietary Instruction

Avoid liver, green leafy vegetables, and cabbage - these are high in Vitamin K which antagonizes warfarin and can unpredictably raise INR, risking valve thrombosis.

Summary of the Entire Case

• RHD with multiple severe valvular lesions
• DVR (Double Valve Replacement) + TV Repair + LAA Exclusion done 8 years ago
• Currently on warfarin (INR ~2.46, therapeutic)
• Presenting for extraction of a chronically decayed tooth (25 years!) with periapical pathology