1. Radical Neck Dissection

• Complete removal of all ipsilateral cervical lymph node groups (levels I-V) and three key non-lymphatic structures:
  • Internal jugular vein
  • Sternocleidomastoid muscle
  • Spinal accessory nerve
• Indication: Typically performed for extensive lymphatic involvement.

2. Modified Radical Neck Dissection

• Similar to radical neck dissection in terms of lymph node removal (levels I-V) but with preservation of one or more of the following structures:
  • Type I: Preserves the spinal accessory nerve.
  • Type II: Preserves the spinal accessory nerve and the sternocleidomastoid muscle.
  • Type III: Preserves the spinal accessory nerve, sternocleidomastoid muscle, and internal jugular vein.
• Indication: Used when there is a need to reduce morbidity while still addressing lymphatic involvement.

3. Selective Neck Dissection

• Preservation of one or more lymph node groups that are typically removed in a radical neck dissection.
• Classification:
  • Originally had named dissections (e.g., supraomohyoid neck dissection for levels I-III).
  • The 2001 modification proposed naming dissections based on the cancer type and the specific node groups removed. For example, a selective neck dissection for oral cavity cancer might be referred to as a selective neck dissection (levels I-III).
• Indication: Used when there is a lower risk of lymphatic spread or when targeting specific areas.

4. Extended Neck Dissection

•  Involves the removal of additional lymph node groups or non-lymphatic structures beyond those included in a radical neck dissection. This may include:
  • Mediastinal nodes
  • Non-lymphatic structures such as the carotid artery or hypoglossal nerve.
• Indication: Typically performed in cases of extensive disease or when there is a need to address additional areas of concern.

Primary Bone Healing and Rigid Fixation

Primary bone healing is a process that occurs when bony fragments are compressed against each other, allowing for direct healing without the formation of a callus. This type of healing is characterized by the migration of osteocytes across the fracture line and is facilitated by rigid fixation techniques. Below is a detailed overview of the concept of primary bone healing, the mechanisms involved, and examples of rigid fixation methods.

Concept of Compression

• Compression of Bony Fragments: In primary bone healing, the bony fragments are tightly compressed against each other. This compression is crucial as it allows for the direct contact of the bone surfaces, which is necessary for the healing process.

• Osteocyte Migration: Under conditions of compression, osteocytes (the bone cells responsible for maintaining bone tissue) can migrate across the fracture line. This migration is essential for the healing process, as it facilitates the integration of the bone fragments.

Characteristics of Primary Bone Healing

• Absence of Callus Formation: Unlike secondary bone healing, which involves the formation of a callus (a soft tissue bridge that eventually hardens into bone), primary bone healing occurs without callus formation. This is due to the rigid fixation that prevents movement between the fragments.

• Haversian Remodeling: The healing process in primary bone healing involves Haversian remodeling, where the bone is remodeled along the lines of stress. This process allows for the restoration of the bone's structural integrity and strength.

• Requirements for Primary Healing:

  • Absolute Immobilization: Rigid fixation must provide sufficient stability to prevent any movement (interfragmentary mobility) between the osseous fragments during the healing period.
  • Minimal Gap: There should be minimal distance (gap) between the fragments to facilitate direct contact and healing.

Examples of Rigid Fixation in the Mandible

1. Lag Screws: The use of two lag screws across a fracture provides strong compression and stability, allowing for primary bone healing.

2. Bone Plates:

   • Reconstruction Bone Plates: These plates are applied with at least three screws on each side of the fracture to ensure adequate fixation and stability.
   • Compression Plates: A large compression plate can be used across the fracture to maintain rigid fixation and prevent movement.

3. Proper Application: When these fixation methods are properly applied, they create a stable environment that is conducive to primary bone healing. The rigidity of the fixation prevents interfragmentary mobility, which is essential for the peculiar type of bone healing that occurs without callus formation.

• Hydrocortisone injection: Mixed with 2% lignocaine for joint inflammation
• GA contraindications: Hemoglobinopathies, severe hematologic disorders
• Non – depolarizing relaxants: Reversed by neostigmine + atropine
• Succinylcholine: Depolarizing muscle relaxant
• Inferior turbinectomy: Done when maxilla is >6 mm superiorly positioned

• 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

Postoperative Airway Obstruction

Causes

• Hematoma: Expanding neck hematoma
• Edema: Laryngeal or facial swelling
• Vocal cord paralysis: Recurrent laryngeal nerve injury
• Foreign body: Gauze, blood clots

Management

• Assessment: Rapid evaluation of obstruction level
• Position: Sitting up if conscious, stable
• Suction: Remove blood/debris if visible
• Medications: Steroids for edema, epinephrine for anaphylaxis
• Definitive: Secure airway if conservative measures fail

Anaphylaxis

Recognition

• Rapid onset: Minutes after exposure
• Skin: Urticaria, angioedema
• Respiratory: Bronchospasm, laryngeal edema
• Cardiovascular: Hypotension, tachycardia

Treatment

• Epinephrine: 0.3-0.5mg IM (1:1000)
• Airway: May need emergency surgical airway
• Fluids: Aggressive IV resuscitation
• Antihistamines: H1 and H2 blockers
• Steroids: Prevent biphasic reaction

Laryngospasm

Triggers

• Stimulation: Light anesthesia, secretions
• Irritants: Blood, gastric contents
• Medications: Propofol, succinylcholine

Treatment

• Positive pressure: Gentle bag-mask ventilation
• Larson's maneuver: Pressure at laryngospasm notch
• Succinylcholine: 0.25-0.5 mg/kg if severe
• Intubation: May be necessary if persistent

Vestibuloplasty

Vestibuloplasty is a surgical procedure aimed at deepening the vestibule of the oral cavity, which is the space between the gums and the inner lining of the lips and cheeks. This procedure is particularly important in prosthodontics and oral surgery, as it can enhance the retention and stability of dentures by increasing the available denture-bearing area.

Types of Vestibuloplasty

1. Vestibuloplasty (Sulcoplasty or Sulcus Deepening Procedure):

   • This procedure involves deepening the vestibule without the addition of bone. It is primarily focused on modifying the soft tissue to create a more favorable environment for denture placement.
   • Indications:
     • Patients with shallow vestibules that may compromise denture retention.
     • Patients requiring improved aesthetics and function of their prostheses.
   • Technique:
     • The procedure typically involves the excision of the mucosa and submucosal tissue to create a deeper vestibule.
     • The soft tissue is then repositioned to allow for a deeper sulcus, enhancing the area available for denture support.

2. Labial Vestibular Procedure (Transpositional Flap Vestibuloplasty or Lip Switch Procedure):

   • This specific type of vestibuloplasty involves the transposition of soft tissue from the inner aspect of the lip to a more favorable position on the alveolar bone.
   • Indications:
     • Patients with inadequate vestibular depth who require additional soft tissue coverage for denture support.
     • Cases where the labial vestibule is shallow, affecting the retention of dentures.
   • Technique:
     • A flap is created from the inner lip, which is then mobilized and repositioned to cover the alveolar ridge.
     • This procedure increases the denture-bearing area by utilizing the soft tissue from the lip, thereby enhancing the retention and stability of the denture.
     • The flap is sutured into place, and the healing process allows for the integration of the new tissue position.

Benefits of Vestibuloplasty

• Increased Denture Retention: By deepening the vestibule and increasing the denture-bearing area, patients often experience improved retention and stability of their dentures.
• Enhanced Aesthetics: The procedure can improve the overall appearance of the oral cavity, contributing to better facial aesthetics.
• Improved Function: Patients may find it easier to eat and speak with well-retained dentures, leading to improved quality of life.

Considerations and Postoperative Care

• Healing Time: Patients should be informed about the expected healing time and the importance of following postoperative care instructions to ensure proper healing.
• Follow-Up: Regular follow-up appointments may be necessary to monitor healing and assess the need for any adjustments to the dentures.
• Potential Complications: As with any surgical procedure, there are risks involved, including infection, bleeding, and inadequate healing. Proper surgical technique and postoperative care can help mitigate these risks.