Hu Xiaoli, Lei Lizhen, Cui Minyi, Huang Zhuwei, Zhang Xiaolei
Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.
Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Sun Yat-sen University, Guangzhou, China.
J Int Med Res. 2019 Oct;47(10):4701-4710. doi: 10.1177/0300060519860960. Epub 2019 Aug 2.
To investigate the periapical bone thicknesses of maxillary posterior teeth at the preferred level for root resection (3 mm apical to the root end) and to determine vertical distances from apex to maxillary sinus floor (MSF) using cone beam computed tomography (CBCT) scans.
CBCT scans were collected from 341 subjects (2389 teeth). Associations of bone thicknesses and vertical distances with age and sex were determined by one-way analysis of variance.
At the level of root-end resection, buccal bone was the thickest over the mesiobuccal roots of second molars (mean, 2.99 mm) and thinnest over the double-root first premolars (mean, 0.29 mm). In maxillary posterior teeth, thicker buccal bone was found in men than in women. The mesiobuccal roots of second molars were nearest to the MSF (mean, 1.33 mm), and were also most frequently extended into the sinus cavity (15.81%). Subjects more than 40 years of age had larger vertical distances from root apices to MSF in the molar region, compared with younger subjects.
Generally, periapical bone was thicker in men, and root apices were located nearer to the MSF in younger subjects. Age and sex should be considered before endodontic microsurgery.
使用锥形束计算机断层扫描（CBCT）研究上颌后牙在牙根切除术首选水平（根尖向根尖下方3mm）的根尖周骨厚度，并确定根尖至上颌窦底（MSF）的垂直距离。
收集了341名受试者（2389颗牙齿）的CBCT扫描数据。通过单因素方差分析确定骨厚度和垂直距离与年龄和性别的关联。
在根尖切除术水平，颊侧骨在第二磨牙近中颊根处最厚（平均2.99mm），在双根第一前磨牙处最薄（平均0.29mm）。在上颌后牙中，男性的颊侧骨比女性厚。第二磨牙的近中颊根最靠近上颌窦底（平均1.33mm），并且也最常延伸至窦腔内（15.81%）。与年轻受试者相比，40岁以上的受试者在磨牙区域根尖至MSF的垂直距离更大。
一般来说，男性的根尖周骨更厚，年轻受试者的根尖更靠近上颌窦底。在进行牙髓显微手术前应考虑年龄和性别。
