Indications and Contraindications for Periradicular Surgery - Failed previous endodontic treatment - Anatomical deviations preventing access or preparation of canal - Procedural errors causing persistent periapical radiolucency, swelling, and pain - Exploratory surgery identifying possible root fractures or perforations - Suspicious or non-healing lesions requiring biopsy - Severe systemic disease affecting healing (contraindication) - Poor periodontal support or coronal seal (contraindication) - Inflammation persists after conventional root canal treatment (contraindication) - Poor oral hygiene increasing infection risk (contraindication) - Lack of appropriate surgical access or unusual bone structure (contraindication)

Procedure and Assessment for Periradicular Surgery - Assessment involves history, clinical exam, and special investigations - Anaesthesia and haemostasis achieved with local anaesthetic and topical agents - Flap design options include full and limited mucoperiosteal flaps - Bone removal and curettage for optimal visualisation and cleaning - Apicectomy and retrograde preparation and filling for sealing the root surface - Thorough history and clinical exam for assessment before surgery - Radiography to identify disease presence and evaluate root treatment - Examination of tooth's relationship to neighboring structures - Vitality testing of adjacent teeth and occlusal loading assessment - Assessment of cortical bone thickness, regional anatomy, and root condition

Complications and Management of Periradicular Surgery - Periradicular surgery has a risk of complications, which can be minimised by the surgeon. - Pain and swelling are common post-surgery and can be managed with prescription analgesics. - Swelling can be minimised by applying pressure with an ice pack for four to six hours after surgery. - Damage to blood vessels during surgery can lead to hemorrhage; severe hemorrhage is rare but serious. - Infection of the surgical site can result from poor surgical technique, poor oral hygiene, or smoking.

Outcomes of Periradicular Surgery - Various benchmarks are used to assess the outcome of periradicular surgery. - Success is evaluated radiographically and clinically. - Successful outcomes include resolution of previous signs and symptoms and reduction of periapical radiolucency. - Incomplete outcomes show partial healing and persistent periapical radiolucency. - Unsuccessful outcomes are characterised by unresolved signs and symptoms and lack of bony replacement.

Root Canal Filling and Other Considerations - The outcome of periradicular surgery depends on factors including the root canal filling. - The filling promotes cementum and bone formation and acts as a barrier for the root canal. - Amalgam filling was commonly used until the 1990s when safety concerns arose. - Calcium-enriched mixture (CEM) cement and mineral trioxide aggregate (MTA) are considered more suitable for root-end fillings. - CEM cement is superior to MTA as a root-end filling material. - Considerations in the revision of previous surgical procedures, including persistent symptoms and incomplete healing.