18.1 Exodontia Principles & Complications

18.1 Exodontia Principles & Complications

Quick Answer: Safe extraction rests on indication + medical risk assessment + anatomy + controlled force. Prefer elevators for luxation and forceps for delivery along the path of least resistance. Prevent and manage alveolar osteitis (dry socket), oroantral communication, root fracture/displacement, hemorrhage, and nerve injury. AFK oral surgery/trauma/pain is about 8 ± 5% of the blueprint—know instruments, flap rules, and high-yield complications first.

Why Exodontia Matters on the AFK

Extraction is the most common oral surgical procedure. Exam items rarely ask only for “pull the tooth”; they test preoperative decision-making, instrument choice, force vectors, and recognition of complications that change management. Link this section to local anesthesia (inferior alveolar nerve block), pharmacology (anticoagulants, bisphosphonates/MRONJ risk), and fascial-space infection chapters.

Indications and Contraindications

Common indications

• Non-restorable caries, vertical root fracture, failed endodontics with poor prognosis
• Advanced periodontal bone loss with hopeless mobility
• Orthodontic space needs, supernumerary teeth
• Pathology associated with a tooth (selected cysts/tumors) when extraction is part of definitive care
• Severe acute infection when the tooth is the source and drainage/extraction is safe under airway control

Relative/absolute cautions (systemic)

• Uncontrolled bleeding disorders or supratherapeutic anticoagulation without physician coordination
• Recent myocardial infarction, unstable angina, uncontrolled hypertension (defer elective surgery)
• Acute untreated severe immunosuppression or poorly controlled diabetes (higher infection risk)
• History of high-dose antiresorptive/antiangiogenic therapy (MRONJ risk—plan carefully; avoid elective extractions when possible)
• Pregnancy: prefer second trimester for elective care; emergency extractions when needed with obstetric awareness
• Radiation to jaws: osteoradionecrosis risk—specialist pathways often required

Never extract solely because a radiograph “looks bad”—document symptoms, restorability, periodontal support, strategic value, and informed consent.

Preoperative Assessment Checklist

1. Medical history / meds — anticoagulants, antiplatelets, steroids, bisphosphonates/denosumab, immunosuppressants, allergies
2. Vitals and anxiety — blood pressure, need for stress reduction
3. Clinical exam — caries extent, mobility, furcation, soft-tissue swelling, trismus
4. Radiographs — full root length, curvature, number of roots, proximity to IAN canal or maxillary sinus, dense bone, hypercementosis
5. Consent — pain, swelling, bruising, dry socket, sinus exposure, nerve injury (especially third molars/premolars near canal), fracture of root/alveolus, need for surgical extraction

Elevators: Principles and Types

Elevators luxate by expanding the socket and severing periodontal fibers; they are not pry bars against adjacent crowns as the primary fulcrum when avoidable.

Elevator mechanics (exam gold)

• Engage cementum, not enamel of the neighbor
• Apply force apically and rotationally/luxating, expanding the socket gradually
• Support the alveolus with fingers (protect soft tissue, sense movement)
• Stop if force is excessive—convert to surgical extraction rather than risk fracture/displacement

Forceps: Selection and Delivery Path

Forceps grasp the crown/root after adequate luxation and deliver the tooth along its long-axis path of withdrawal.

Universal rules of forceps use

• Beaks adapt as apical as possible on root structure under the gingiva when safe
• Avoid crushing the crown of a brittle tooth without prior luxation (crown fracture → surgical retrieval)
• Deliver buccal for most posterior teeth because buccal plate is thinner—except when anatomy dictates otherwise
• Never use uncontrolled torsional force on multi-rooted teeth still firmly attached

Simple vs Surgical Extraction

Simple (closed) extraction: adequate access, visible crown, favorable roots, no need for flap/bone removal.

Surgical (open) extraction is indicated when:

• Failed simple extraction / broken root below bone crest
• Dense bone, dilacerated or divergent roots, ankylosis, hypercementosis
• Impacted or partially erupted teeth
• Need to section roots or remove bone under control
• High risk of sinus communication or nerve injury without controlled approach

Surgical extraction sequence (concept)

1. Local anesthesia with profound soft-tissue and bone anesthesia
2. Flap design (see below)
3. Limited bone removal if needed (prefer buccal trough)
4. Tooth sectioning when multi-rooted or locked
5. Elevation of segments
6. Debridement of follicle/pathology, irrigation
7. Smooth sharp bony edges
8. Reposition flap; suture for primary closure when indicated
9. Postoperative instructions and hemostasis verification

Flap Design Principles

A mucoperiosteal flap provides access while protecting blood supply and allowing tension-free closure.

Core rules

• Full-thickness (mucoperiosteal) for most extractions requiring bone access
• Base of flap wider than apex (broad base) to preserve vascularity
• Incisions over sound bone, not over bony defects when possible
• Avoid vertical releasing incisions over prominences, frena, or directly over the mental foramen path
• Include papillae carefully; preserve aesthetics in the anterior
• Reflect with a periosteal elevator in a controlled subperiosteal plane

Vertical releases are placed at line angles, not mid-facial on the papilla, and should allow passive seating of the flap after surgery.

Immediate Intraoperative Complications

Root fracture

Common. Radiograph if needed. Retrieve with elevators/picks under direct vision; section remaining root; avoid blind apical pushing toward sinus or canal.

Root displacement

• Into maxillary sinus — stop, radiograph, do not blindly probe; small roots may be managed with Caldwell-Luc/endoscopic pathways by specialists; prevent oroantral fistula
• Into soft tissue / submandibular space / infratemporal — imaging and referral often required
• Into IAN canal — specialist care

Alveolar/tuberosity fracture

Stabilize fragment if still attached to periosteum and tooth not yet free; may need to complete extraction carefully or stabilize and delay. Large tuberosity fractures risk denture support loss and sinus communication.

Soft-tissue injury / instrument slips

Protect flaps with retractors; control hemorrhage with pressure; suture lacerations.

Hemorrhage

Local measures first: pressure, gauze, gelatin sponge, oxidized cellulose, topical thrombin where available, sutures, cautery of soft-tissue bleeders. Systemic coagulopathy needs medical coordination. Never dismiss arterial spurters from soft tissue.

Dry Socket (Alveolar Osteitis)

Alveolar osteitis is a painful post-extraction condition from premature loss/breakdown of the clot and exposed bone—not primarily a bacterial osteomyelitis.

Prevention

• Atraumatic technique, irrigation, avoid excessive vasoconstrictor-only reliance for hemostasis planning
• Smoking cessation counseling around surgery
• Appropriate post-op instructions (avoid vigorous rinsing/spitting early; gentle care)

Management

• Irrigate gently; place sedative dressing (e.g., eugenol-containing packing per local protocols)
• Analgesics (often stronger than simple NSAID alone initially)
• Dressing changes as needed until pain subsides
• Antibiotics not first-line unless concurrent infection

AFK trap: dry socket ≠ cellulitis. Treat pain and socket environment; do not reflexively prescribe antibiotics for classic dry socket alone.

Oroantral Communication (OAC) / Fistula

Maxillary premolar/molar roots often approximate the sinus floor.

Clinical clues

• Bubbling of blood from socket with nose blowing/Valsalva
• Voice change, fluid from nose when drinking
• Confirm with gentle testing—avoid aggressive probing that enlarges defect

Sinus precautions (patient instructions)

No nose blowing, sneezing with mouth open, no straws/smoking, decongestants per clinician judgment, antibiotics when indicated for sinus contamination risk.

Nerve Injury

Nerves at risk in routine extractions: inferior alveolar (IAN), lingual, mental, occasionally long buccal or nasopalatine with flaps.

Classification (Seddon concepts for exams)

• Neurapraxia — conduction block, endoneurium intact; best prognosis, often weeks
• Axonotmesis — axonal disruption, variable recovery months
• Neurotmesis — complete severance; poorest spontaneous recovery

Management principles

• Document deficit immediately (map anesthesia/paresthesia/dysesthesia)
• Most neuropraxias improve; persistent significant deficit beyond ~3 months (or earlier if complete anesthesia after known high-risk injury) warrants specialty referral for microsurgical evaluation
• Corticosteroids sometimes used early by surgeons; evidence varies—know referral pathway more than drug dogma
• Never promise 100% recovery in consent discussions for high-risk third molars

Postoperative Care Essentials

• Bite on gauze 20–30 minutes; replace if needed; avoid chewing on site initially
• Ice first 24 hours for swelling control; soft diet
• Analgesia: NSAID ± acetaminophen first-line when not contraindicated; opioids sparingly
• Oral hygiene: gentle brushing elsewhere; saline rinses after 24 hours
• Warning signs: progressive swelling, fever, dysphagia/dyspnea, uncontrolled bleeding, severe pain after day 3 (dry socket vs infection)

Rapid review list

• Elevators luxate; forceps deliver along path of least resistance
• Surgical extraction when closed approach fails or anatomy is hostile
• Flaps: broad base, over bone, preserve blood supply, envelope vs triangular
• Dry socket: day 2–4 severe pain, empty socket, afebrile—dressing + analgesia, not automatic antibiotics
• OAC: size-based management + sinus precautions; large defects need surgical closure
• IAN/lingual/mental injuries—document and follow; refer persistent deficits
• Blueprint weight OS/trauma/pain ≈ 8 ± 5%—complications are high-yield

Section 18.2 applies these principles to impacted third molars, classifications, surgical sequencing, and biopsy selection.