Preoperative Assessment and Planning

Successful third molar extraction begins with comprehensive preoperative evaluation. Medical and dental history assessment must identify contraindications, bleeding disorders, anticoagulation therapy (warfarin with INR monitoring, newer direct oral anticoagulants), immunosuppression, and allergy history. Vital sign documentation establishes baseline blood pressure, heart rate (target 60-100 bpm), and oxygen saturation baseline. For medically complex patients, consultation with the primary care physician or relevant specialists confirms surgical safety clearance.

Radiographic assessment determines surgical complexity and approach selection. Panoramic radiography identifies tooth position, impaction depth, angulation, and root morphology. Periapical radiographs supplement panoramic imaging to evaluate periodontal status and detect periapical pathology. CBCT imaging (cone-beam computed tomography) should be reserved for complex cases involving: extreme angulation, close anatomic relationships to inferior alveolar canal (within 2 mm proximity), close maxillary sinus contact, or previous failed extraction attempts. CBCT sensitivity for accurate inferior alveolar canal visualization exceeds 90%, compared to conventional radiography sensitivity of 60-70%.

Surgical difficulty assessment guides patient counseling and treatment planning. Pell and Gregory classification stratifies impaction depth (Class I, II, III) and spatial positioning (Position A, B, C), with Class III Position C impactions representing highest surgical complexity. Additional factors increasing difficulty include: age over 35 years, increased bone density, unfavorable tooth angulation (distal angulation increases difficulty relative to vertical positioning), and constricted mouth opening limiting access. Difficulty scoring guides operative time prediction (simple extractions typically 15-20 minutes; complex impactions requiring bone removal 45-90 minutes) and complication risk communication.

Anesthesia and Sedation Selection

Local anesthesia selection balances efficacy with safety margins. Lidocaine 1% or 2% with 1:100,000 epinephrine represents standard infiltration anesthesia, with maximum recommended dose 4.4 mg/kg (typically 300 mg absolute maximum in adult patients). Inferior alveolar nerve block achieves pulpal anesthesia with 1.8 mL (1.5% dose = 27 mg lidocaine) to 3.6 mL volumes. Buccal infiltration supplementation provides soft tissue anesthesia essential for flap elevation and closure.

Conscious sedation remains appropriate for anxious patients undergoing routine extraction. Nitrous oxide combined with local anesthesia (titrated 30-50% oxygen : 50-70% nitrous oxide mixture) produces anxiolysis with minimal respiratory depression. Blood oxygen saturation should remain above 95% (pulse oximetry monitoring mandatory), and oxygen supplementation is required during and 5 minutes post-sedation to prevent diffusion hypoxia.

Intravenous sedation protocols employ benzodiazepines and opioids titrated to conscious sedation endpoints: patient maintains independent airway, responds to verbal stimulation, and can follow simple commands. Midazolam (IV): 2 mg initial bolus, 1 mg incremental doses at 2-3 minute intervals to maximum 0.1 mg/kg (typically 5-10 mg total) produces predictable anxiolysis. Fentanyl (IV): 25-50 micrograms initial dose, 25 microgram increments every 3-5 minutes (maximum 100-150 micrograms) provides analgesia. Reversal agents (flumazenil for midazolam 0.2 mg IV repeated every 60 seconds; naloxone for opioids 0.4 mg IV repeated every 2-3 minutes) should be immediately available.

Antibiotic prophylaxis reduces surgical site infection and alveolar osteitis incidence. A single preoperative dose (60 minutes prior) of amoxicillin-clavulanic acid 2 g orally or cefazolin 1-2 g IV provides optimal coverage. Clindamycin 600 mg orally or IV suits penicillin-allergic patients. Therapeutic antibiotic courses (5-7 days postoperatively) benefit patients with immunosuppression, difficult extractions with prolonged operative times exceeding 60 minutes, or significant bone removal.

Operative Technique and Instrumentation

Flap design balances surgical access with wound healing and anatomic preservation. Envelope flaps without vertical releasing incisions suit simple extractions with minimal bone removal. Buccal-lingual flaps with sulcular anterior extension (mesial incision at distal line angle of second molar, extending anteriorly) provide superior access for complex impactions requiring significant bone removal. Lingual flap reflection in posterior mandible should remain superficial to avoid lingual nerve injury, maintaining flap position 2-3 mm lingual to tooth margin.

Bone removal employs rotary instruments (high-speed turbine burs at 300,000 rpm or low-speed straight handpieces at 20,000 rpm) with continuous copious irrigation (0.9% saline at minimum 50 mL/minute) to prevent thermal necrosis. Surgical bur selection progresses from coarse (diamond or tungsten carbide burs creating rapid bone removal) to finer burs for precise visualization. Irrigation systems maintaining bone temperature below 47ยฐC prevent necrosis; excessive heating above this threshold causes irreversible osteocyte death and impaired healing.

Tooth sectioning divides impacted teeth into manageable segments when bone removal alone appears prohibitive. Longitudinal coronal section reduces crown volume and permits sequential root removal. Sagittal sectioning (sectioning from occlusal surface through long axis) decreases bone removal requirements and reduces operational trauma.

Root elevation uses periosteal elevators and forceps designed for third molar extraction (American forceps 210S, English forceps 286, or specialized impaction forceps). Systematic luxation with rocking and rotating movements disrupts periodontal ligament fibers before forceps application. Controlled traction prevents sudden root breakage; applying steady pressure over 5-10 seconds allows periodontal ligament fiber disruption before progression.

Hemorrhage Control and Hemostasis

Intraoperative hemorrhage control begins with epinephrine-containing local anesthesia (1:100,000 concentration) producing vasoconstriction lasting 45-60 minutes. Bone removal over the tooth prevents excessive hemorrhage from remaining bone edge. After tooth extraction, direct pressure using 4x4 gauze saturated with 3% hydrogen peroxide or 1:1000 epinephrine solution applied for 5-10 minutes controls oozing.

Persistent bleeding despite direct pressure indicates need for additional intervention. Electrocautery (monopolar or bipolar) seals bleeding bone edges and small vessel stumps. Bone wax or collagen matrices (collagen sponges, gelatin foam) placed into extraction sockets provide hemostatic scaffolding. Suturing socket margins with absorbable sutures (chromic catgut 3-0 or 4-0, polyglactin 910) approximates wound edges and reduces hematoma formation. Chlorhexidine or epinephrine-soaked gauze placed intraorally under gauze pack instructions (bite on gauze 30 minutes) further controls residual hemorrhage.

Postoperative hemorrhage occurring hours after extraction despite initial hemostasis typically indicates inadequate socket irrigation or missed bleeding vessel. Patient instruction emphasizing soft bite on moistened tea bag (tannic acid promotes platelet plug formation) for 20 minutes, head elevation, and ice application (20 minutes on, 20 minutes off for 6 hours post-extraction) controls most secondary hemorrhage. Persistent heavy bleeding warrants return visit for socket re-examination, additional irrigation, and suturing.

Wound Closure and Flap Management

Flap closure approximates mucosa with absorbable sutures (chromic catgut, polyglactin, or poliglecaprone sutures in 3-0 or 4-0 size) or non-absorbable sutures (nylon, silk) requiring 7-10 day removal. Continuous locking suturing technique provides tension-free flap closure reducing dehiscence risk (flap separation incidence 3-8% following complex third molar extraction). Interrupted suturing offers easier selective tension adjustment. Primary closure reduces alveolar osteitis incidence from 5-10% (when present in extraction socket) to 1-3% range.

Flap thickness preservation protects underlying nerve and vascular structures. Thin, translucent flaps indicate excessive periosteal dissection; flaps should maintain 2-3 mm periosteal thickness minimizing vascular compromise. Gentle handling prevents traumatic flap injury; excessive cautery or manipulation increases inflammatory response and delayed healing.

Inferior Alveolar Nerve Management

The inferior alveolar nerve courses through the mandibular canal at depth varying from 1-5 mm relative to mandibular crest depending on vertical alveolar bone height. CBCT imaging accurately identifies canal location in complex cases. Radiographic proximity (canal position within 2 mm of tooth apex on CBCT) predicts increased paresthesia risk.

Careful flap reflection maintaining nerve visualization, bone removal using sharp instruments (permitting precise control over direction), and tooth sectioning reducing lateral traction represent key nerve preservation techniques. Nerve stretching produces temporary paresthesia (numbness) affecting 0.4-3.8% of extraction cases, with incidence increasing with patient age and surgical complexity. Permanent sensory deficit (lasting beyond 6 months) occurs in 0.1-0.5% of cases. Immediate postoperative paresthesia indicates temporary stretching; patients should be counseled to expect sensation return over 8-12 weeks in 90% of temporary cases.

Intraoperative contact between tooth or instruments and the visible nerve mandates: immediate discontinuation of traction, nerve visualization without manipulation, and potential surgeon referral to oral and maxillofacial surgeon for continued care if patient is in general dentist office. Delayed paresthesia developing days after extraction suggests hematoma compression; urgent imaging (CBCT) and possible surgical drainage may be indicated.

Postoperative Instructions and Restrictions

Patient discharge occurs when patient demonstrates stable vital signs, alert consciousness (if sedated), and hemostasis. Postoperative prescriptions typically include: acetaminophen 1000 mg every 6 hours (maximum 4000 mg daily) or ibuprofen 400-600 mg every 6-8 hours (for routine pain); stronger analgesics (hydrocodone 5 mg with acetaminophen 500 mg, one tablet every 6 hours as needed; avoid exceeding 8 tablets daily) address severe pain. NSAIDs should continue 48-72 hours post-extraction, as sustained anti-inflammatory action reduces swelling more effectively than acetaminophen monotherapy.

Activity restrictions limit hemorrhage and dry socket risk: no smoking or alcohol for 72 hours (smoking delays healing; alcohol potentiates bleeding), avoid strenuous exercise or heavy lifting for 3-5 days, avoid using extraction sites for eating for 7 days. Ice application (20 minutes on, 20 minutes off for first 6 hours) reduces swelling; warm compress application after 48 hours promotes drainage of remaining inflammation.

Oral hygiene modifications begin 24 hours post-extraction: gentle warm salt rinses (1/2 teaspoon salt in 8 oz water, four times daily) commencing post-meals and before bed, avoid vigorous rinsing or spitting (negative pressure dislodges clot promoting dry socket), and gentle tooth brushing avoiding extraction sites. Chlorhexidine 0.12% rinses (15 mL, twice daily for 1-2 weeks) reduce oral bacterial load and surgical site infection risk.

Conclusion

Wisdom tooth extraction requires systematic patient evaluation, appropriate anesthesia selection, skilled operative technique, and comprehensive postoperative management. Success depends on accurate surgical difficulty assessment, meticulous hemostasis, nerve preservation protocols, and patient education emphasizing activity restrictions and wound care. Complication ratesโ€”including dry socket (alveolar osteitis) at 1-5%, temporary paresthesia at 0.4-3.8%, and permanent nerve injury at 0.1-0.5%โ€”should be discussed during informed consent. With proper planning and execution, third molar extraction achieves high success rates with minimal morbidity.