Apicoectomy
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Direct answer
Apicoectomy — modern texts prefer root-end resection, and the full procedure is resection with retrograde filling — is the surgical endodontic operation performed when a root-canal-treated tooth keeps its apical infection despite adequate conservative treatment. Through a mucoperiosteal flap, bone over the apex is removed, the apical three millimetres of root are resected, a small retrograde cavity is prepared with ultrasonic tips, and it is sealed with mineral trioxide aggregate or a comparable material. Indications include persistent or enlarging periapical lesions after root canal treatment and retreatment, irretrievable separated instruments or overextended fills, true apical cysts, apical root fractures, and canal anatomy that defeats orthograde access. Reported success in contemporary series commonly sits in the high-eighty-to-ninety percent range. Upper teeth demand respect for the maxillary sinus, lower molars for the inferior alveolar nerve — which is why the operation is an anterior-tooth favourite.
What you must remember
- Vocabulary: apicoectomy (also spelled apicectomy) = removal of the root apex; the complete procedure today is root-end resection plus ultrasonic retrograde preparation plus a root-end filling — using all three terms earns marks.
- The 3 mm rule with minimal bevel: resecting about three millimetres eliminates most accessory canals and the apical delta, where residual infection hides; the cut stays near-perpendicular to the long axis, because a steep bevel exposes dentinal tubules and creates a leakage path.
- Indications: persistent apical periodontitis after adequate root canal treatment and retreatment, unretrievable separated instruments, gross overfill, apical cyst, vertical root fracture confined to the apex, calcified or inaccessible canals, and posts that cannot be removed.
- Not indicated: a tooth with hopeless periodontal support, an unfavourable crown-root ratio, or a deep vertical root fracture — extraction or implant is the honest answer.
- Technique sequence: radiographic measurement, trapezoidal flap (semilunar incisions largely historical), irrigated osteotomy, 3 mm resection, inspection for isthmuses and microfractures, 3 mm ultrasonic retro-cavity, MTA (or IRM or Super EBA), radiographic check, closure.
- Material history: amalgam, the classical retrofill, fell from favour for corrosion, leakage, tattoos, and moisture sensitivity; MTA is the modern benchmark.
- Local danger map: upper lateral incisors, premolars, and molars abut the maxillary sinus (a small breach usually heals; inform and give sinus precautions); lower premolars and molars sit over the inferior alveolar canal — measure on the preoperative radiograph before you cut.
Worked example: the failed root canal on an upper lateral incisor
A young woman has had two root canal treatments on tooth 12; the periapical radiolucency has grown and biting is tender. The crown is sound, probing depths normal — a textbook indication. Measure the lesion on the IOPA and note the apex against stable bony landmarks, so the osteotomy is targeted. Anaesthesia: infraorbital, local, and palatal infiltration. Flap: a full-thickness trapezoidal flap with vertical releasing incisions over sound bone — the semilunar flap of older textbooks compromises both blood supply and access. Osteotomy with a round bur under constant saline over the apex bulge; the curetted granuloma goes to histopathology, since it may be a cyst. Resect three millimetres with a fissure bur at a minimal bevel, inspect the cut face, prepare a three millimetre retro-cavity with an ultrasonic tip, and pack MTA. Irrigate, check the final film, reposition, suture; review at one week, then radiographically. Each step answers a why: full-thickness flap because periosteum carries blood supply; minimal bevel because tubules leak; three-millimetre cavity because a shallow plug is a plug in name only.
Where students slip
Three slips recur. First, students present apicoectomy as the first resort for any apical lesion — the examiner's counter is "what would you try before surgery?" and the answer is orthograde retreatment, whose success in well-selected cases rivals surgery. Second, the amalgam era lingers: answers still list amalgam as the retrofill of choice; the contemporary answer is MTA, with IRM and Super EBA as alternatives. Third, the bevel: candidates describe a 45-degree cut out of habit and lose the mark for not knowing why modern technique favours a near-perpendicular resection. Indian university convention frames this as "surgical endodontics," a 10-mark essay marked on definition, indications and contraindications, steps, retrofill materials, and success factors — five heads, in that order. The most reliable viva question is "why resect three millimetres?" — hold the apical delta and lateral canal answer ready.
Frequently asked questions
What is apicoectomy and when is it indicated?
Root-end resection with retrograde filling, indicated for persistent periapical infection after adequate root canal treatment and retreatment, irretrievable separated instruments or overfill, apical cysts, and inaccessible canal anatomy.
Why are three millimetres of the root apex removed?
The apical three millimetres contain most accessory canals and the apical delta where residual infected tissue and necrotic debris survive, so resecting this zone removes the hidden reservoirs of infection.
Which material is preferred for the retrograde filling and why?
Mineral trioxide aggregate — it seals well in the presence of moisture, is biocompatible and osteoinductive — while amalgam has been abandoned for corrosion, leakage, and tattoo formation.
Why is the semilunar flap no longer preferred?
It gives limited access, cuts across unattached mucosa with poorer blood supply, scars visibly, and cannot be extended — full mucoperiosteal flaps have replaced it.
What caution governs apicoectomy near the maxillary sinus?
The apex may lie close to or through the sinus floor; a small breach usually heals with sinus precautions, but the surgeon must measure the relation preoperatively and avoid pushing debris or the resected apex into the sinus.