- 作者：Thomas von Arx ; Prof Dr med dent&lowast ; ; thomas.vonarx@zmk.unibe.ch" class="auth_mail" title="E-mail the corresponding author ; Andrea Hä ; nni ; med dent&lowast ; ; Pedram Sendi ; PD Dr med ; Dr med dent&dagger ; ; Daniel Buser ; Prof Dr med dent&lowast ; ; Michael M. Bornstein ; PD Dr med dent&lowast ;
- 关键词：Accessory innervation ; mandibular anatomy ; retromolar canal ; retromolar foramen
- 刊名：Journal of Endodontics
- 出版年：2011
- 出版时间：December 2011
- 年：2011
- 卷：37
- 期：12
- 页码：1630-1635
- 全文大小：883 K
Methods
Patients referred for panoramic radiography were consecutively enrolled, provided a limited cone-beam computed tomography (CBCT) scan had also been taken in the area of interest. Radiographs were retrospectively screened for the presence of a retromolar canal, and linear measurements (distance to second molar, height, width) were taken.
Results
One hundred twenty-one sides in 100 patients were evaluated (100 unilateral and 21 bilateral cases). A total of 31 retromolar canals were identified with CBCT (25.6%). Only 7 of these canals were also seen on the corresponding panoramic radiographs. The existence of a retromolar canal was not statistically related to gender or side. With regard to the linear measurements, the mean distance from the retromolar canal to the second molar was 15.16 mm (±2.39 mm), the mean height of the canal was 11.34 mm (±2.36 mm), and the mean width was 0.99 mm (±0.31 mm).
Conclusions
This radiographic study documents a frequency of 25% for the presence of a retromolar canal. The clinician is advised to preserve this anatomic variation when performing surgery in the retromolar area and to consider additional locoregional anesthesia in the case of failed mandibular block anesthesia.