Wang Z, Zhou L, Xu D L, Xu S L
Dental Implant Center, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China(Present address: Department of Stomatology, First People's Hospital of Baiyun District, Guangzhou 510400, China).
Dental Implant Center, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2017 Nov 9;52(11):656-660. doi: 10.3760/cma.j.issn.1002-0098.2017.11.002.
To examine the root position of the maxillary central incisors and to provide clinical reference before the immediate implant placement. Cone-beam CT (CBCT) data of the maxillary central incisors of 934 patients (934 incisors) was selected and the root position classsified. The sagittal root position in the alveolar bone was classified as buccal, middle, or palatal. The buccally positoined type was further classified into three subtypes of Ⅰ,Ⅱ, and Ⅲ. Most of the maxillary incisor root (95.4% [891/934]) was positioned buccally. Among the buccal-type incisors, the subtypes Ⅰ, Ⅱ and Ⅲ accounted for 47.5% (423/891), 44.2% (394/891), and 8.3% (74/891). In the 4 mm apical to the cemento-enamel junction and the middle of the root, the thickest buccal bone wall was 0.86 and 0.95 mm, the thickest palatal bone wall was 1.65 and 2.37 mm. In the apical location, the thickest buccal bone wall was 1.89 mm, the thickest palatal bone wall was 7.83 mm. Most of the maxillary central incisors studied are positioned buccally, and half of these patients have adequate buccal bone and are suitable for immediate implant placement.
观察上颌中切牙的牙根位置，为即刻种植术前提供临床参考。选取934例患者上颌中切牙的锥形束CT（CBCT）数据（934颗切牙）并对牙根位置进行分类。牙槽骨内牙根的矢状位分为颊侧、中间或腭侧。颊侧位置型进一步分为Ⅰ、Ⅱ、Ⅲ三个亚型。大多数上颌切牙牙根（95.4%[891/934]）位于颊侧。在颊侧型切牙中，Ⅰ、Ⅱ、Ⅲ亚型分别占47.5%（423/891）、44.2%（394/891）和8.3%（74/891）。在牙骨质-釉质界根尖4mm处及牙根中部，最厚的颊侧骨壁分别为0.86mm和0.95mm，最厚的腭侧骨壁分别为1.65mm和2.37mm。在根尖部位，最厚的颊侧骨壁为1.89mm，最厚的腭侧骨壁为7.83mm。研究的大多数上颌中切牙位于颊侧，其中一半患者颊侧骨量充足，适合即刻种植。
