title: Efficacy of the technique of piezoelectric corticotomy for orthodontic traction of impacted mandibular third molars.
abstract: Our aim was to assess the efficacy of piezoelectric corticotomy for orthodontic traction of mandibular third molars close to the inferior alveolar nerve. Thirty patients with impacted third molars close to the nerve were included in the study, 15 of whom were treated with conventional orthodontic traction and 15 with piezoelectric corticotomy. We recorded duration of treatment including exposure and orthodontic traction, and time to the final extraction. Postoperative complications including trismus, swelling, and pain were also noted. Alveolar bone levels mesial and distal to the second molars were evaluated on cone-beam computed tomographic (CT) images. Student's t test was used to assess the significance of differences between the groups. After orthodontic treatments all impacted third molars were successfully removed from the inferior alveolar nerve without neurological damage. The mean (SD) duration of surgical exposure in the piezoelectric corticotomy group was significantly longer than that in the conventional group (p=0.01). The mean (SD) duration of traction was 4 (2.3) months after piezoelectric corticotomy, much shorter than the 7.5 (1.3) months in the conventional group (p=0.03). There were no significant differences in postoperative complications between the groups. There was a significant increase in the distal alveolar height of second molars after treatment in both groups (p<0.01). We conclude that the use of piezoelectric corticotomy allows more efficient and faster traction of third molars with a close relation between the root and the inferior alveolar nerve, although it took longer than the traditional technique.
authors: Department of Oral Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiaotong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, PR China.
authors: Zhigui
authors: Z
authors: Ma
authors: Department of Oral Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiaotong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, PR China. Electronic address: xgzmy@163.com.
authors: Guangzhou
authors: G
authors: Xu
authors: Department of Oral Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiaotong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, PR China. Electronic address: yangchi63@hotmail.com.
authors: Chi
authors: C
authors: Yang
authors: Department of Oral Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiaotong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, PR China.
authors: Qianyang
authors: Q
authors: Xie
authors: Department of Oral Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiaotong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, PR China.
authors: Yuqing
authors: Y
authors: Shen
authors: Department of Oral Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiaotong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, PR China.
authors: Shanyong
authors: S
authors: Zhang
mesh_terms: D000328:Adult; D000539:Alveolar Process / Q000000981:diagnostic imaging; D054893:Cone-Beam Computed Tomography / Q000379:methods; D004487:Edema / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000601:surgery*; D008340:Mandibular Nerve / Q000000981:diagnostic imaging; D008963:Molar / Q000000981:diagnostic imaging; D008964:Molar, Third / Q000000981:diagnostic imaging / Q000601:surgery*; D050793:Orthodontic Extrusion / Q000379:methods*; D010027:Osteotomy / Q000379:methods*; D010149:Postoperative Pain / Q000209:etiology; D059745:Piezosurgery / Q000379:methods*; D011183:Postoperative Complications; D011862:Radiography, Panoramic / Q000379:methods; D014092:Tooth Root / Q000000981:diagnostic imaging; D014095:Tooth, Impacted / Q000000981:diagnostic imaging / Q000601:surgery*; D016896:Treatment Outcome; D014313:Trismus / Q000209:etiology; D055815:Young Adult
keywords: Bone formation; Cone-beam CT; Impacted third molar; Orthodontic traction; Piezoelectric corticotomy