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Oral Health-related quality of life after coronectomy for impacted mandibular third molar1096Gregory’s classification). We also recorded the proximity of the IAN to the third molar roots. With 3-dimensional computed tomography, we confirmed the relationship between the IAN and the roots of the impacted mandibular third molar.Surgical procedureThe impacted mandibular third molar coronectomy was performed with the patient under local anesthesia. All surgeries were performed by one surgeon in a standardized fashion, with a similar technique in all cases. All patients received a standardized, mandibular nerve block injection, with additional local infiltration of the buccal nerve. The location, temperature, type, and amount of anesthetic (40 mg articaine/hydrochloride with .01 mg epinephrine, administered with a 1.7-mL syringe, Ultracain D-S forte; SanofiAventis, Netherlands BV, Gouda, the Netherlands), and the type of needle (27 gauge/.40 × 35 mm) were all standardized, according to the hospital protocol. A triangular flap was used in all patients. Briefly, an incision was started at the distobuccal edge of the second molar, then dropped at a slight oblique angle, and then curved forward into the mandibular vestibule. The second part of the incision started from the mandibular ramus and ended at the distobuccal aspect of the second molar. Any bone overlying the crown of the impacted third molar was removed with a round surgical bur, which exposed the cementoenamel junction of the tooth. Next, a fissure bur was used to separate the crown from the roots. The root was shortened to 3-4 mm below the bony margin and checked for mobility. Copious irrigation with sterile saline was performed with rotary instrumentation. Dental follicular soft tissue was removed, and the socket was thoroughly irrigated with saline. The surgical site was primarily closed with 3/0 Undyed Vicryl Rapide (Ethicon, Somerville, MA, USA). Immediately after surgery, the details of the procedure were recorded.Postoperative managementAfter surgery, all patients were instructed to bite on gauze for 30 min. They were also instructed not to rinse or spit during the first 24 h postoperatively. Ibuprofen (600 mg Brufen, Abbot BV, Hoofddorp, the Netherlands) was prescribed three times a day. No postoperative antibiotics were prescribed. The day after surgery, patients began rinsing the mouth with a 0.12% aqueous chlorhexidine mouth rinse for 1 min twice per day for 7 days. Patients were