Oral Surgery: Principles and Practice
Extractions · Flap Design · Wound Healing · Impacted Teeth · Complications
TL;DR
Oral surgery encompasses the diagnosis and surgical management of diseases, injuries, and defects of the oral and maxillofacial region. For the general dentist and dental student, the core competencies include: tooth extraction (simple and surgical), management of impacted third molars, surgical flap design, wound healing principles, and management of post-surgical complications. Understanding both the technique and the anatomical basis for surgical decisions is essential for safe practice.
- Wound healing follows four overlapping phases — disruption of any phase causes delayed healing or complications: (1) Haemostasis (0–24 hours): vasoconstriction → platelet plug formation (primary haemostasis) → coagulation cascade → fibrin clot. This clot is the scaffold for healing — do not disrupt it with vigorous rinsing, sucking, or smoking; (2) Inflammation (days 1–4): vascular permeability increases, neutrophils arrive first (1–2 days) to kill bacteria and debride debris; macrophages arrive at day 2–3 and are essential for debridement and signalling the next phase; clinical signs: rubor, calor, dolor, tumor (redness, heat, pain, swelling) — this is normal; (3) Proliferation (days 4–21): fibroblasts produce collagen (Type III initially — then replaced by Type I); angiogenesis (new capillary formation from endothelial budding, driven by VEGF); granulation tissue (highly vascular connective tissue — the “raw” tissue that fills the wound); epithelialisation (keratinocytes migrate from wound margins); (4) Remodelling (weeks to years): Type III collagen replaced by Type I (stronger, more organised); wound contracts; scar matures. At one year, scar tissue reaches ~80% of original tissue tensile strength — it never equals unwounded tissue.
- Alveolar osteitis (dry socket) is the most common complication of tooth extraction — it is not an infection: Dry socket (alveolar osteitis) is a failure of normal socket healing due to premature dissolution of the blood clot before the granulation tissue has replaced it, leaving bare bone in the socket. Incidence: 1–5% of all extractions; 20–30% of mandibular third molar extractions. Risk factors (in order of evidence strength): smoking (nicotine causes vasoconstriction → reduced clot formation + bacteriocidal effect from smoke on clot); female sex + oral contraceptives (oestrogen increases fibrinolytic activity — higher risk on day 1 of cycle when OC pack taken); traumatic extraction or excessive bone removal; pre-existing infection; previous dry socket; poor oral hygiene. Presentation: 2–4 days post-extraction, the patient presents with increasingly severe, deep, throbbing, non-responsive-to-analgesics pain; on inspection, the socket contains no clot (or a grey, necrotic remnant clot), bare bone is visible/palpable, and the socket may smell foul. Treatment: irrigation with warm saline to remove debris, then place a sedative dressing (zinc oxide eugenol in ribbon gauze — Alvogyl, or bismuth subgallate-iodoform paste [BIPP]) into the socket. This covers the exposed bone and dramatically reduces pain within hours. Change dressing every 2–3 days until granulation tissue forms. Antibiotics are NOT indicated (it is not an infection).
- Flap design principles determine blood supply, access, and healing quality: A surgical flap must have: (1) adequate blood supply — the flap base must be wider than the apex to avoid ischaemia; the pedicle (base) of the flap carries the blood supply; (2) adequate access — the flap must expose enough bone to accomplish the procedure without excessive retraction (which causes tissue trauma); (3) incisions placed over sound bone — never over the defect or extraction socket; incisions must have healthy bone beneath them so that healing occurs from a vascular base; (4) smooth, clean incision lines to allow clean re-apposition. Common designs: envelope flap (horizontal incision only, along gingival margin — no vertical releasing incisions; limited access; used for simple surgical extractions); triangular flap (envelope + one vertical releasing incision at anterior margin — allows reflection of the flap anteriorly; good access for single-tooth surgery); trapezoidal (rectangular) flap (envelope + two vertical releasing incisions — maximum access; higher risk of flap necrosis if base is too narrow; used for complex third molar surgery or extensive bone procedures).
- Third molar impaction classification guides surgical planning — the deeper and more angulated, the more complex the procedure: Pell and Gregory classification assesses the depth of the impacted lower third molar relative to the occlusal plane (Class A — occlusal surface at or above second molar occlusal plane; Class B — between occlusal and cervical line; Class C — below CEJ of second molar) and the available space in the ramus (Class I — adequate mesio-distal space; Class II — half in ramus; Class III — fully in ramus). Winter’s classification describes the angulation: vertical (most common), mesioangular (next most common — tilted forward; often easiest to remove with a distal undercut), horizontal (impacted lying on its side — complex; may be adjacent to inferior alveolar nerve), distoangular (tilted backward — most difficult to remove), and transverse/inverted. The combination of depth (Pell-Gregory) and angulation (Winter) determines the difficulty rating and the surgical approach (bone removal, sectioning, root separation).
- Inferior alveolar nerve (IAN) involvement in lower third molar surgery is the most serious complication for patient consent and surgical planning: The IAN runs in the inferior alveolar canal within the mandibular body — it passes immediately inferior or lateral to the roots of the lower third molar in a significant proportion of cases. Signs of proximity on panoramic radiograph: darkening of the root (indicating root approximates the nerve canal); deflection of root at the nerve canal; narrowing of the canal; diversion of the canal around the root. When IAN proximity is identified, CBCT is indicated to confirm the three-dimensional relationship. If the IAN is at high risk, coronectomy (intentional root retention — only the crown is removed) can be performed — the roots are deliberately left in place to prevent nerve disturbance. Coronectomy is appropriate when: roots are intimately related to the IAN on CBCT; patient is neurologically asymptomatic; no pathology is associated with the roots; patient provides informed consent. Coronectomy contraindications: mobile roots; horizontal impaction (roots may migrate toward nerve); active infection at the site.
Key Facts
What Is Oral Surgery?
Oral and maxillofacial surgery (OMFS) is the specialty dealing with the diagnosis and surgical and adjunctive treatment of diseases, injuries, and defects affecting the functional and aesthetic aspects of the oral and maxillofacial region. For the general dentist, “oral surgery” in daily practice primarily encompasses: routine and surgical tooth extraction (including impacted third molars), biopsy of intraoral lesions, pre-prosthetic surgery (alveoloplasty, torus removal, soft tissue corrections), management of odontogenic infections, and management of post-surgical complications. The oral surgeon’s scope extends to orthognathic surgery, cleft palate, trauma, TMJ surgery, head and neck oncology, and implant placement — but the foundation of all these procedures rests on the same principles of tissue biology, asepsis, wound healing, and surgical technique.
Why It Matters
Surgery questions on the INBDE and NBDE test: wound healing phases (which cell type arrives first — neutrophils; what does granulation tissue contain; what is the strength of scar tissue at 1 year); dry socket (aetiology, clinical presentation, treatment, relationship to infection); third molar classification (Winter’s angulation, Pell-Gregory depth); flap design principles; surgical anatomy (inferior alveolar nerve, mental nerve, maxillary sinus, lingual nerve); and medical considerations for surgery (anticoagulants, bisphosphonates, medically complex patients). Clinically, complications from poorly planned or executed extractions are among the most common causes of dental malpractice claims.
Wound Healing
Primary vs. Secondary Intention
Primary intention (first intention): wound edges are approximated and sutured closed; the wound heals with minimal scar formation; requires well-vascularised tissue with no tension across the suture line; fastest healing; least scar. In oral surgery: most mucosal incisions with appropriate flap design are closed by primary intention.
Secondary intention (granulation): wound edges are not approximated; the wound heals by filling with granulation tissue from the base, followed by wound contraction and epithelialisation from the margins; produces more scar tissue; takes longer; creates a scar that contracts. In oral surgery: extraction sockets heal by secondary intention — the socket fills with clot, then granulation tissue, then woven bone, then remodelled lamellar bone. This is the normal, expected process. Socket bone fill is essentially complete by 3–4 months but cortication of the crest continues for 6–12 months.
Phases of Wound Healing
| Phase | Timing | Key Cells | Key Events | Clinical Significance |
|---|---|---|---|---|
| Haemostasis | Seconds to hours (0–24h) | Platelets; thrombin; fibrin | Vasoconstriction (mediated by serotonin, thromboxane A2); platelet aggregation and plug formation (GPIIb/IIIa receptors + fibrinogen); coagulation cascade (extrinsic and intrinsic pathways) → fibrin clot. Clot acts as scaffold for subsequent wound healing cells | Blood clot must be preserved. Factors that dissolve the clot prematurely (smoking, vigorous rinsing, sucking — negative pressure, OCP fibrinolysis) lead to dry socket. Anticoagulant medications (warfarin, NOACs, aspirin) impair this phase |
| Inflammation | Days 1–4 | Neutrophils (first), then macrophages; mast cells; lymphocytes | Histamine/bradykinin → vasodilation + increased vascular permeability → neutrophil margination + diapedesis → phagocytosis of bacteria and debris. Day 2–3: macrophages (CD68+) take over — phagocytose debris; release growth factors (PDGF, TGF-β, VEGF, EGF) that signal fibroblasts and endothelial cells to proliferate | The inflammatory phase is necessary — suppressing it excessively (high-dose steroids, NSAIDs) delays healing. Signs of inflammation (redness, heat, swelling, pain) are normal in the first 3–4 days. After day 4, persistent or worsening inflammation suggests infection |
| Proliferation | Days 4–21 | Fibroblasts; endothelial cells (angiogenesis); keratinocytes | Fibroblasts produce Type III collagen + proteoglycans → granulation tissue (soft, highly vascular, pale pink/red tissue filling the wound bed); angiogenesis (VEGF-driven capillary budding from existing vessels); epithelialisation (keratinocyte migration from wound margins at ~1mm/day); wound contraction (myofibroblast-driven wound edge approximation) | Granulation tissue is fragile — do not disturb with probing or manipulation. Epithelialisation cannot proceed if wound is allowed to dry out — moist wound healing is faster. Granulation tissue fills extraction socket by ~2 weeks |
| Remodelling | Week 3 to 1+ year | Fibroblasts; osteoblasts/osteoclasts (bone wounds) | Type III collagen → replaced by Type I collagen (cross-linked, organised along stress lines — stronger); matrix metalloproteinases (MMPs) degrade excess collagen; scar matures; wound contracts; tensile strength increases (but never reaches original strength) | Tensile strength at 3 weeks: ~20% of original. At 6 weeks: ~70%. At 1 year: ~80% maximum. Scar never reaches 100% tensile strength of unwounded tissue. Keloid/hypertrophic scar: excessive collagen deposition during remodelling — rare in oral mucosa |
Tooth Extraction
Simple (Closed) Extraction
Simple extraction is performed on a tooth that is visible and accessible with standard instruments without requiring surgical incision. The technique: (1) Adequate anaesthesia — both local infiltration (or inferior alveolar block for mandibular molars) and infiltration of the palatal/lingual surface; check fully profound before beginning (ask about sensation, not pain — tingling/numbness not the same as anaesthesia); (2) Luxation of the periodontal ligament — use a straight elevator (Warwick James, Couplands) inserted into the PDL space to disrupt PDL fibres and dilate the socket; apply apically directed force, rotate, and lever gently — do not use excessive force; (3) Extraction forceps — beaks placed on the long axis of the tooth roots (not the crown — this fractures the crown); apply controlled, slow, deliberate rocking (buccal-lingual) force to dilate the socket further; then deliver the tooth in the direction of least resistance; for upper anterior teeth, rotational force (figure-8 motion) is appropriate; for lower anterior teeth, labio-lingual rocking; for posterior teeth, figure-8 or buccal-lingual; (4) Socket management — inspect socket for retained fragments; irrigate; compress socket walls with gauze to reduce haemorrhage; verify bleeding controlled; give post-operative instructions.
Surgical (Open) Extraction
Surgical extraction is required when a tooth cannot be removed by simple extraction — including: badly broken-down crowns (no crown to grip with forceps); hypercementosis (bulbous roots); dilacerated roots; impacted or partially erupted teeth; teeth with root apices near the inferior alveolar nerve or maxillary sinus. The approach: raise a mucoperiosteal flap to expose the alveolar bone, use a bur to remove bone around the tooth and/or section the tooth, extract the root(s) individually, irrigate, and close the flap with sutures.
Flap Design Principles
A mucoperiosteal flap is full-thickness: the incision divides mucosal epithelium, lamina propria, and periosteum in one cut; the flap is elevated with a periosteal elevator (Mitchell’s trimmer or Howarth’s elevator). The flap is elevated as a complete periosteal unit — this is important because the periosteum contains the vascular supply; partial-thickness incisions (splitting the mucosa from the periosteum) are occasionally used in some procedures (e.g., free gingival grafts) but not for surgical extraction.
Vertical releasing incisions must avoid: (a) the mental foramen (below the mandibular premolars — vertical incision anterior to first premolar risks nerve damage); (b) the papillae (interdental papillae are difficult to suture — incisions should not bisect papillae but rather go through the papilla base or via the sulcus); (c) the greater palatine foramen (palatal flaps).
Impacted Teeth
Third Molar Classification
Third molar impaction affects ~25–35% of the population in Western countries. Impaction occurs when the tooth fails to erupt fully into functional occlusion due to lack of space (most common cause), abnormal angulation, or physical obstruction. Assessment: panoramic radiograph is mandatory (relationship to IAN, adjacent second molar, follicle size); CBCT for high-IAN risk cases.
| Classification System | Categories | Significance |
|---|---|---|
| Winter’s angulation | Vertical, mesioangular, horizontal, distoangular, transverse/inverted | Determines the direction of force needed for delivery and the need for bone removal/tooth sectioning. Horizontal and distoangular are most complex |
| Pell-Gregory — depth | Class A (occlusal surface ≥ second molar occlusal plane); Class B (between occlusal and cervical line); Class C (below CEJ of second molar) | Deeper impaction → more bone removal → greater difficulty → higher complication risk |
| Pell-Gregory — ramus space | Class I (full mesio-distal width in front of ramus); Class II (half in ramus); Class III (fully within ramus) | Less space in ramus → more difficult delivery; Class III often requires crown sectioning or tooth division |
| Follicle size | Normal follicle ≤2.5mm; expanded follicle >2.5–3mm; pericoronal cyst if >5mm | Enlarged follicle may indicate dentigerous cyst formation — submit all soft tissue for histopathology |
Indications for third molar removal: Recurrent pericoronitis (infection/inflammation around the crown); caries in the third molar or adjacent second molar not amenable to restoration; periodontal disease distal to second molar (bone loss from retained impacted third molar); dentigerous cyst or tumour associated with follicle; pathological fracture of the mandible; orthodontic reasons (space creation or prevention of anterior crowding — controversial evidence). Contraindications: high-risk patient (systemic condition, anticoagulants, bisphosphonate-related osteonecrosis risk); high IAN risk without patient consent for coronectomy; tooth symptom-free with adequate bone support and no pathology in older patient (risk of complications may outweigh benefit).
Post-Surgical Complications
| Complication | Onset | Features | Management |
|---|---|---|---|
| Dry socket (alveolar osteitis) | 2–4 days | Severe throbbing pain; empty socket; bare bone; fetor oris; no signs of infection (no pus, normal WBC) | Warm saline irrigation; sedative dressing (ZOE gauze/Alvogyl); change every 2–3 days; no antibiotics |
| Post-extraction haemorrhage | Immediately (reactionary) or 2–7 days (secondary) | Bleeding from socket; reactionary = immediate post-op bleeding; secondary = infection-related vessel erosion days later | Pressure with gauze (20 min); suturing socket; haemostatic agents (oxidised cellulose, fibrin foam, tranexamic acid mouthwash); check for coagulation disorder or anticoagulant use |
| Inferior alveolar nerve injury | Immediate (during surgery) | Paraesthesia, anaesthesia, or dysaesthesia of lower lip and chin; ipsilateral to procedure | Monitor — most neuropraxias resolve spontaneously in weeks to months; axonotmesis may take longer; neurotmesis (complete transection) may be permanent. Vitamins B1, B6, B12 supplementation may assist. Refer to OMFS if no improvement at 6–8 weeks |
| Lingual nerve injury | Immediate | Paraesthesia/anaesthesia of ipsilateral anterior two-thirds of tongue + floor of mouth; loss of taste (chorda tympani) | Monitor; refer to OMFS if persisting beyond 6 weeks. Lingual nerve injury in third molar surgery incidence: ~0.5–2% temporary; <0.1–0.5% permanent (higher for lingual split technique — now abandoned) |
| Oro-antral communication (OAC) | During extraction (maxillary posterior teeth) | Nose blow test positive (air whistles from socket); maxillary sinus visible or exposed; more common with large maxillary molar root proximity to sinus | Small OAC (<5mm): figure-8 suture, Spongostan/haemostatic plug, no nose blowing, antibiotics (amoxicillin + metronidazole); large OAC (>5mm): buccal advancement flap immediately; antibiotic + decongestant. If not treated → oro-antral fistula (epithelialised communication — requires surgical closure) |
| Post-operative infection | 3–7 days | Increasing pain after day 2–3 (not resolving); fever; swelling; erythema; purulence in socket; trismus | Incision and drainage (I&D) if fluctuant; antibiotics (amoxicillin ± metronidazole, or clindamycin if penicillin-allergic); irrigate socket; analgesics; monitor for spread (cellulitis, Ludwig’s angina) |
| Fracture of adjacent tooth or restoration | During extraction | Crack or fracture of adjacent tooth or existing restoration; recognised during procedure | Document; assess extent; repair or refer as indicated; inform patient; document in notes |
Surgical Instruments
Understanding the function of key surgical instruments is tested in board examinations: Elevators: Warwick James (straight and curved — periosteal elevator, inter-radicular use), Coupland’s (straight, chisel-tip — elevates periodontal ligament), Cryer (crossed, right and left pair — inter-radicular between root tips in mandibular molar socket), Winter’s crossbar elevator (T-bar handle — leverage). Forceps (upper): Upper straight forceps (incisors/canines); upper premolar forceps (one pointed and one flat beak — premolars); upper molar forceps (two broad curved beaks — molars, one pointed beak for buccal furcation); upper bayonet forceps (premolars/third molars/roots). Forceps (lower): Lower universal forceps (anterior/premolars — parallel beaks); lower molar forceps (angled, pointed beaks for furcation); lower root forceps. Retractors: Kilner cheek retractor; Minnesota retractor. Rongeurs/bone files: Used to smooth alveolar bone after extraction (alveoloplasty). Suture materials: Resorbable — Vicryl (polyglactin — resorbs by hydrolysis in 56–70 days; used for most mucosal closure); Catgut (collagen — resorbs by proteolysis in 7–10 days; rapid); MONOCRYL (poliglecaprone — resorbs 91–119 days). Non-resorbable — silk (braided; comfortable but harbours plaque — remove at 7–10 days); nylon (monofilament — strong; non-reactive).
Medical Considerations in Oral Surgery
Anticoagulants: Patients on warfarin: check INR on day of procedure; most simple extractions can be performed safely with INR ≤3.5 with local haemostatic measures; do not routinely stop warfarin (stopping increases thromboembolism risk far more than the modest increase in surgical bleeding). Tranexamic acid mouthwash (5% — 10mL, 2 minutes, 4 times daily for 5 days post-operatively) is evidence-based haemostatic adjunct. NOACs (rivaroxaban, apixaban, dabigatran) — most guidelines suggest timing the extraction to coincide with trough drug level (morning dose of a twice-daily NOAC — extract in the afternoon; for once-daily, skip the morning dose only if advised by the prescribing physician). Do not routinely stop.
Bisphosphonates (MRONJ risk): Medication-related osteonecrosis of the jaw (MRONJ) is a serious complication of bisphosphonate or denosumab therapy. The jaw is uniquely vulnerable because: high bone turnover in the jaw (dental function, chewing, extraction); rich vascularity → high bisphosphonate concentration in jaw bone; dental procedures create mucosal breaches that allow bacteria to reach already compromised bone. The risk is dose and duration dependent: low with oral bisphosphonates for osteoporosis (<4 years, low dose); significantly higher with intravenous bisphosphonates for malignancy (zolendronic acid). Management: refer complex cases to OMFS; obtain a “drug holiday” (bisphosphonate holiday of 2–3 months before extraction) from the prescribing physician for high-risk IV bisphosphonate patients, if oncologically safe; promote meticulous non-surgical dental care to avoid extractions wherever possible; if extraction unavoidable, ensure best possible tissue closure, CHX rinse, and close monitoring.
Clinical Considerations
- Never attempt a forceps extraction without adequate anaesthesia, elevator use, and PDL disruption: The most common cause of root fracture during extraction is applying forceps force to a tooth whose PDL is intact. The correct sequence is: infiltrate/block, wait for full anaesthesia, use an elevator to disrupt the PDL first (tearing the PDL fibres reduces the force required for extraction by ~50%), then apply forceps. If the root fractures, assess accessibility, attempt root elevation with Cryer elevators, and do not persist with blind probing — refer if not easily retrieved.
- Post-operative instructions must be clear and given both verbally and in writing: Instructions should include: do not rinse for 24 hours (preserve clot); bite on gauze for 30–60 minutes; if oozing, bite on moist gauze for further 30 minutes; avoid smoking for at least 72 hours (dry socket risk); avoid hot drinks for 24 hours (vasodilation → more bleeding); soft diet for 1–3 days; take analgesics regularly (not PRN — for the first 48 hours, take paracetamol + ibuprofen on a scheduled basis); expect mild swelling and oozing in the first 24–48 hours — this is normal; return or call if bleeding does not stop, severe pain develops after 2 days (possible dry socket), or fever develops (possible infection).
- Maxillary posterior root tips can be displaced into the maxillary sinus — do not push: If a maxillary molar root tip is near the sinus floor and resists retrieval, avoid applying apical-directed pressure which risks displacing the fragment into the antrum. Options: (a) attempt surgical retrieval with small curved elevators from the lateral approach; (b) if the fragment is small (<3mm) and the patient is asymptomatic, consider leaving it and monitoring with a periapical radiograph (many small fragments integrate without complications); (c) if displaced into the sinus, refer to OMFS for Caldwell-Luc approach or functional endoscopic sinus surgery (FESS) retrieval. Document all decisions carefully.
- Haemostasis in the anticoagulated patient relies on local measures — not reversal of medication: For most simple extractions and many surgical extractions in anticoagulated patients, local haemostatic measures are sufficient: good socket compression; tight flap closure if surgically opened; intrasocket haemostatic agents (oxidised regenerated cellulose — Surgicel; Spongostan gelatin foam; BioDent fibrin foam); tranexamic acid mouthwash (5%, four times daily for 5 days). Reversing anticoagulation increases the risk of stroke, myocardial infarction, or DVT/PE — risks that far outweigh the controllable surgical bleeding risk.
- Suture selection matters — use resorbable sutures for routine oral surgery when possible: Non-resorbable sutures (silk, nylon, prolene) require a post-operative appointment for removal at 7–10 days. Patient compliance with suture removal is variable — retained sutures beyond 14 days accumulate plaque, harbour bacteria, and cause tissue reactions. Resorbable sutures (Vicryl 3/0 or 4/0) are appropriate for most routine oral mucosal closures — they maintain adequate tensile strength for the first 3–4 weeks (adequate for mucosal healing) and then resorb without requiring removal. Silk is appropriate for non-compliant patients only if suture removal can be guaranteed, or when precise tissue approximation is critical and a return appointment is reliable.
Common Mistakes & Misconceptions
- Misconception: “Dry socket is an infection and requires antibiotics.”
Correction: Dry socket (alveolar osteitis) is NOT an infection — it is a wound healing failure characterised by premature clot loss and exposed alveolar bone. There is no bacterial cause requiring antibiotic treatment. The treatment is purely symptomatic and supportive: irrigation and sedative dressing. Prescribing antibiotics for dry socket is inappropriate, contributes to antibiotic resistance, and does not accelerate healing. If there are signs of true infection (purulence, fever, lymphadenopathy, spreading erythema), that is a separate diagnosis that does require antibiotics alongside drainage. - Misconception: “Macrophages are the first cells to arrive at a wound.”
Correction: Neutrophils (polymorphonuclear leukocytes) are the first cells to arrive at a wound — they migrate from vessels within 1–2 hours of wounding and peak at 24–48 hours. They provide antimicrobial defence and initial debridement. Macrophages arrive at approximately day 2–3 and take over from neutrophils as the dominant cellular component of inflammation by day 3–4. The macrophage is arguably more important for wound progression — it releases the growth factors (PDGF, TGF-β, VEGF) that signal fibroblasts and endothelial cells to begin the proliferative phase. - Misconception: “Wound tensile strength returns to normal after healing is complete.”
Correction: Healed wounds never achieve the tensile strength of unwounded tissue. Maximum tensile strength is ~80% of unwounded tissue, achieved at approximately one year. At 3 weeks post-injury, tensile strength is only ~20% — which is why activities that stress the wound (vigorous eating, trauma) must be avoided. At 6 weeks, strength is ~70%. The clinical implication: patients must understand that “healed” surgical sites are not as strong as uninjured tissue, and that wound breakdown can occur with excessive mechanical stress even weeks after apparent healing. - Misconception: “The distal rest on the posterior abutment tooth for a simple extraction — wait, that’s RPD — for surgery: ‘Always stop warfarin before extractions.'”
Correction: This is one of the most commonly mismanaged clinical situations. Stopping warfarin before dental extraction significantly increases the risk of life-threatening thromboembolic events (stroke, MI, DVT/PE) — a far greater risk than controllable surgical haemorrhage in the dental setting. Evidence-based guidelines recommend continuing warfarin (if INR ≤3.5) and using local haemostatic measures instead. The INR should be checked within 24–72 hours of the procedure. If the INR is >3.5, defer the extraction and liaise with the patient’s medical team to adjust dosing — do not stop warfarin without medical input. - Misconception: “A mesioangular impaction is always the most complex third molar to remove.”
Correction: The mesioangular impaction is often one of the easier lower third molar angulations to remove — the mesial tilt provides an accessible path of delivery by removing bone from the distal aspect and delivering the tooth mesially. The distoangular impaction is generally considered the most difficult because the tooth is tilted distally into the ramus — there is no distal bone space for delivery, the crown must be sectioned to change the path of delivery, and access is limited by the anterior surface of the ramus. The horizontal impaction is also complex due to the proximity to the IAN and the need for sectioning.
Related Topics
References & Sources
- Fragiskos FD (ed) (2007). Oral Surgery. Springer. [Comprehensive oral surgery text — extractions, flap design, impacted teeth, complications]
- Pedlar J, Frame JW (2007). Oral and Maxillofacial Surgery, 2nd ed. Churchill Livingstone. [Standard OMFS reference — surgical principles, wound healing, complication management]
- Lodi G, Figini L, Sardella A, et al. (2012). Antibiotics to prevent complications following tooth extractions. Cochrane Database of Systematic Reviews, 11:CD003811. [Cochrane review — antibiotics for extraction complications; no evidence for routine antibiotic use in healthy patients]
- Blum IR (2002). Contemporary views on dry socket (alveolar osteitis): a clinical appraisal of standardization, aetiopathogenesis and management. International Journal of Oral and Maxillofacial Surgery, 31(3):309–317. [Comprehensive review of dry socket — incidence, pathogenesis, risk factors, treatment]
- Ruggiero SL, Dodson TB, Fantasia J, et al. (2014). American Association of Oral and Maxillofacial Surgeons Position Paper on Medication-Related Osteonecrosis of the Jaw — 2014 Update. Journal of Oral and Maxillofacial Surgery, 72(10):1938–1956. [AAOMS MRONJ guidelines — bisphosphonate and denosumab risk, management]
- Regan D, Srinivasan A, Petridis L, et al. (2020). Evidence-based guidance for the management of dental patients on anticoagulants. British Dental Journal, 228(4):257–262. [Current guidance — continuing vs. stopping anticoagulants for dental extractions]
- Gaudy JF, Arreto CD (2005). Manual of Surgical Pharmacology in Odontology and Stomatology. Éditions CdP. [Pharmacology reference — haemostatic agents, suture materials, antibiotic prophylaxis]
- Kumar V, Abbas AK, Aster JC (2021). Robbins and Cotran Pathologic Basis of Disease, 10th ed. Elsevier. [Chapter 3 — Tissue Renewal, Regeneration, and Repair: the authoritative reference for wound healing phases, cellular biology, and scar formation]
Summary
Oral surgery rests on a foundation of wound healing biology and surgical technique. Wound healing progresses through four phases: haemostasis (clot formation — the scaffold), inflammation (neutrophils first, then macrophages — debridement and signalling), proliferation (fibroblasts, angiogenesis, granulation tissue, epithelialisation), and remodelling (collagen maturation to ~80% tensile strength at 1 year). Dry socket is the most common post-extraction complication — premature clot dissolution → bare bone exposure → severe pain from days 2–4; it is NOT an infection and does not require antibiotics; treatment is sedative dressing (ZOE gauze). Flap design requires adequate blood supply (wider base), incisions over sound bone, and adequate access. Third molars are classified by angulation (Winter’s: vertical/mesioangular/horizontal/distoangular — distoangular is most difficult) and depth (Pell-Gregory Class A/B/C). Medical considerations: do not stop warfarin routinely (local haemostasis is the approach); bisphosphonate-related osteonecrosis requires specialist planning for extractions in high-risk patients.
Key Takeaways
- Wound healing cell sequence: Neutrophils first (day 1–2) → Macrophages (day 2–3, growth factors) → Fibroblasts (proliferation, collagen) → Remodelling. Tensile strength: 20% at 3 weeks; 70% at 6 weeks; 80% maximum at 1 year.
- Dry socket: Days 2–4; bare bone in socket; severe pain; NOT infection; no antibiotics. Treatment: warm saline irrigation + ZOE sedative dressing, changed every 2–3 days. Risk factors: smoking, female OCP users, traumatic extraction.
- Flap design: Base wider than apex (blood supply). Incisions over sound bone (not over defects). Trapezoidal = maximum access. Avoid mental foramen (above lower premolars), papillae, and greater palatine foramen.
- Third molar difficulty: Distoangular = most difficult. Mesioangular = often easiest. Horizontal = most IAN risk. Use CBCT if panoramic shows IAN proximity. Coronectomy if high IAN risk on CBCT.
- Anticoagulation: Do NOT stop warfarin routinely (INR ≤3.5 safe with local haemostasis). Use tranexamic acid mouthwash, haemostatic agents, tight closure. Check INR pre-op. Stopping warfarin risks stroke/MI — not justified for dental extractions.
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