Catgut Sutures

• Composition: Processed animal intestine (usually sheep)
• Degradation mechanism: Enzymatic degradation by tissue enzymes
• Types:
  • Plain catgut: Resorbs in 7-10 days
  • Chromic catgut: Cross-linked with chromium, resorbs in 2-3 weeks
• Advantages: Natural, good handling
• Disadvantages: Variable absorption, inflammatory response, potential allergic reactions

Vicryl (Polyglactin 910)

• Composition: Synthetic copolymer of glycolic and lactic acid
• Degradation mechanism: Hydrolysis (broken down by water)
• Absorption time: 2-3 weeks (loses tensile strength in 2-3 weeks, completely absorbed in 60-90 days)
• Variants:
  • Vicryl: Standard braided suture
  • Vicryl Rapide: Faster absorption (7-10 days)
  • Vicryl Plus: Contains triclosan for antibacterial properties
• Advantages: Predictable absorption, minimal tissue reaction, good knot security
• Clinical uses: Soft tissue closure, periodontal surgery, buried sutures

Polydiaxone (PDS-II)

• Composition: Synthetic polymer (polydioxanone)
• Structure: Monofilament
• Degradation mechanism: Hydrolysis
• Absorption time: ~6 months with minimal tissue reaction
• Tensile strength: Retains 70% at 2 weeks, 50% at 4 weeks
• Advantages:
  • Longest absorption time among synthetic absorbables
  • Excellent biocompatibility
  • Minimal inflammatory response
  • Good for wounds requiring extended support
• Clinical uses: Deep tissue layers, slow-healing wounds, pediatric surgery

Other Synthetic Absorbable Sutures

Monocryl (Poliglecaprone 25)

• Absorption: 3-4 months
• Advantages: Low tissue reaction, good cosmetic results
• Uses: Subcuticular closure, soft tissue approximation

Biosyn (Glycomer 631)

• Absorption: 3-4 months
• Advantages: Braided with monofilament properties
• Uses: General soft tissue approximation

• Pediatric mandibular fractures: Greenstick, esp. condyle
• TMJ ankylosis signs in child:
  • Limited mouth opening
  • Prominent antegonial notch
  • Elongated coronoid
  • Short ramus
  • Bony bridging
  • Fullness on affected side

• Mandible lever mechanics:
  • Class III lever: Tensile forces at upper surface, compressive forces at lower border.
  • Finite element analysis: Bite force anterior/posterior to fracture → compressive forces at superior border.
• Lag screw fixation: Provides highest rigidity (2000 – 4000 N compressive force).
• Titanium plates: Least deflection under MRI; heat production is a concern.
• Stress shielding: Metallic plates cause atrophic changes due to lack of functional stimuli.
• Resorbable plates: Made of polydioxanone, polyglycolic acid, polylactic acid; degrade into CO₂ & H₂O via citric acid cycle.

• Torque testing:
  • Successful osseointegration: 10 – 20 N/cm force without unscrewing.
  • Clinical signs: Percussion, immobility, no movement with 5 lb lateral force.
  • Failure: Horizontal mobility >1 mm or movement <500 g force.
• Radiographic sign of implant failure: Loss of crestal bone.
• MRI/CT with titanium implants: Safe; CT can subtract titanium to eliminate scatter.

Ludwig's Angina

Ludwig's angina is a serious, potentially life-threatening cellulitis or connective tissue infection of the submandibular space. It is characterized by bilateral swelling of the submandibular and sublingual areas, which can lead to airway obstruction. The condition is named after the German physician Wilhelm Friedrich Ludwig, who provided a classic description of the disease in the early 19th century.

Historical Background

• Coining of the Term: The term "Ludwig's angina" was first coined by Camerer in 1837, who presented cases that included a classic description of the condition. The name honors W.F. Ludwig, who had described the features of the disease in the previous year.

• Etymology:

  • The word "angina" is derived from the Latin word "angere," which means "to suffocate" or "to choke." This reflects the potential for airway compromise associated with the condition.
  • The name "Ludwig" recognizes the contributions of Wilhelm Friedrich Ludwig to the understanding of this medical entity.

• Ludwig's Personal Connection: Interestingly, Ludwig himself died of throat inflammation in 1865, which underscores the severity of infections in the head and neck region.

Clinical Features

Ludwig's angina typically presents with the following features:

1. Bilateral Swelling: The most characteristic sign is bilateral swelling of the submandibular area, which can extend to the sublingual space. This swelling may cause the floor of the mouth to elevate.

2. Pain and Tenderness: Patients often experience pain and tenderness in the affected area, which may worsen with movement or swallowing.

3. Dysphagia and Dysarthria: Difficulty swallowing (dysphagia) and changes in speech (dysarthria) may occur due to swelling and discomfort.

4. Airway Compromise: As the swelling progresses, there is a risk of airway obstruction, which can be life-threatening. Patients may exhibit signs of respiratory distress.

5. Systemic Symptoms: Fever, malaise, and other systemic signs of infection may be present.

Etiology

Ludwig's angina is most commonly caused by infections that originate from the teeth, particularly the second or third molars. The infection can spread from dental abscesses or periodontal disease into the submandibular space. The most common pathogens include:

• Streptococcus species
• Staphylococcus aureus
• Anaerobic bacteria

Diagnosis and Management

• Diagnosis: Diagnosis is primarily clinical, based on the characteristic signs and symptoms. Imaging studies, such as CT scans, may be used to assess the extent of the infection and to rule out other conditions.

• Management:

  • Airway Management: Ensuring a patent airway is the top priority, especially if there are signs of respiratory distress.
  • Antibiotic Therapy: Broad-spectrum intravenous antibiotics are initiated to target the likely pathogens.
  • Surgical Intervention: In cases of significant swelling or abscess formation, surgical drainage may be necessary to relieve pressure and remove infected material.