Zhang Li-Qi, Duan Deng-Hui, Wang En-Bo, Wang Hom-Lay, Liu Zheng
Department of Oral and Maxillofacial Radiology, School and Hospital of Stomatology, Peking University, Beijing, P.R. China.
Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA.
J Oral Implantol. 2022 Oct 1;48(5):386-390. doi: 10.1563/aaid-joi-D-20-00397.
The purpose of his study was to investigate the projected ridge-implant dimensions derived from virtual superimposition of implants on intact first molars mimicking immediate implantation in the mandible (Md1) and maxilla (Mx1) using cone-beam computed tomography (CBCT). The CBCT records of 41 patients (19 males and 22 females) with Md1 or Mx1 were collected. Ten-millimeter-long cylindrical implants with different diameters were virtually positioned at prosthetically ideal angles into interradicular septum using CBCT software. Radiographic alveolar ridge height (ARH), alveolar ridge width (ARW), gap distance, and vertical distance from the implant platform to the alveolar crest were measured. Twenty Mx1s (48.8%) and 21 Md1s (51.2%) were included. The mean ARH values were 7.13 ± 4.32 and 15.64 ± 1.80 mm for Mx1 and Md1, respectively; 87.8% of mesiobuccal sites had gap distance of >2 mm when 6-mm-diameter implants were used. Increasing implant diameter from 6 to 9 mm decreased the percentage of sites with ARW > 2 mm from 80.5% to 41.5% buccally and from 86.4% to 26.8% lingually. The mean vertical distance from the implant platform to the alveolar crest was 1.41 ± 1.09 mm buccally and 1.11 ± 1.10 mm lingually. Immediate implant placement of first molars, especially in the maxilla, requires stringent presurgical evaluation. Implants no wider than 6 mm placed into the interradicular septum may meet acceptable running room and alveolar plate thickness criteria if the jumping distance is grafted. Further clinical trials are needed to confirm these findings in this virtual study.
本研究的目的是利用锥形束计算机断层扫描（CBCT），通过在完整的第一磨牙上虚拟叠加种植体，模拟在下颌骨（Md1）和上颌骨（Mx1）中即刻种植，来研究种植体与牙槽嵴的预计尺寸关系。收集了41例患有Md1或Mx1的患者（19例男性和22例女性）的CBCT记录。使用CBCT软件将不同直径的10毫米长圆柱形种植体以修复理想角度虚拟放置到根间间隔中。测量影像学牙槽嵴高度（ARH）、牙槽嵴宽度（ARW）、间隙距离以及种植体平台到牙槽嵴顶的垂直距离。纳入了20例Mx1（48.8%）和21例Md1（51.2%）。Mx1和Md1的平均ARH值分别为7.13±4.32毫米和15.64±1.80毫米；当使用6毫米直径种植体时，87.8%的近中颊侧部位间隙距离>2毫米。种植体直径从6毫米增加到9毫米时，颊侧ARW>2毫米的部位百分比从80.5%降至41.5%，舌侧从86.4%降至26.8%。种植体平台到牙槽嵴顶的平均垂直距离颊侧为1.41±1.09毫米，舌侧为1.11±1.10毫米。第一磨牙的即刻种植，尤其是在上颌骨中，需要严格的术前评估。如果进行跳跃距离植骨，植入根间间隔不超过6毫米的种植体可能符合可接受的操作空间和牙槽骨板厚度标准。需要进一步的临床试验来证实本虚拟研究中的这些发现。
