Complications in oral surgery INTRODUCTION Oral surgical procedures can be compli cated by various untoward incidents d uring the surgery or in the recovery phase. The best way in the management o f complications is prevention. CLASSIFICATION The complications can be classified as follows- 1. Intra-operative complications- a) Local complications b) Systemic complications. 2. Post-operative complications- a) Immediate Local complications Systemic complications. b) Delayed Local complications Systemic complications. Intra-operative complications a) Haemorrhage. b) Nerve injury. c) Oro-antral perforation and fistula formation. d) Oro-nasal fistula. e) Fracture of the bone or tooth. f) TMJ dislocation. g) Displacement of tooth into spaces. h)Fracture of maxillary tuberosity. i) Damage to the adjoining dental structures. j) Angio-neurotic oedema. k) Emphysema Post-operative complications a)Infection b) Trismus. c) Dry socket. d) Swelling and pain.