Department of Oral and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Department of Periodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Long Term Eff Med Implants. 2022;32(1):33-43. doi: 10.1615/JLongTermEffMedImplants.2021039328.
Dental implant is a commonly used treatment modality for replacement of the missing teeth. The aim of the present study was to evaluate a number of bone-related factors at the implant site preoperatively by cone-beam computed tomography (CBCT).
A total of 400 implant sites were evaluated on CBCT images. The height, width, angle of residual ridge, thickness of cortical bone crest, and the ridge concavity were evaluated on cross sectional images at four regions: the anterior maxilla, anterior mandible, posterior maxilla, and posterior mandible.
The highest thickness of cortical bone was observed in posterior mandible followed by anterior mandible, anterior maxilla, and posterior maxilla. In the mandible, the mean buccal concavity was higher in the anterior than in the posterior region (P = 0.0094). The measurements indicated that in both the maxilla (P = 0.0256) and mandible (P < 0.0001), the residual ridge width was lower in the anterior than in the posterior region; while the height of the residual ridge was higher in the anterior than in the posterior region in the mandible (P < 0.0001). In the maxilla, the remaining ridge angle in the anterior region was greater than that in the posterior region (P < 0.0001).
Anatomical variations detected on CBCT results in personalized treatment planning considering best site and the best fixture in terms of size and position prior to implant fixture insertion.
种植牙是一种常用的缺失牙修复方法。本研究旨在通过锥形束 CT（CBCT）术前评估种植部位的一些与骨相关的因素。
对 400 个种植部位的 CBCT 图像进行评估。在四个区域（上颌前区、下颌前区、上颌后区和下颌后区）的横断面上评估剩余牙槽嵴的高度、宽度、角度、皮质骨嵴厚度和牙槽嵴凹陷。
下颌后区皮质骨最厚，其次是下颌前区、上颌前区和上颌后区。在下颌骨中，前区颊侧凹陷大于后区（P = 0.0094）。测量结果表明，在上颌骨（P = 0.0256）和下颌骨（P < 0.0001）中，前区的剩余牙槽嵴宽度均低于后区；而在下颌骨中，前区的剩余牙槽嵴高度高于后区（P < 0.0001）。在上颌骨中，前区的剩余牙槽嵴角度大于后区（P < 0.0001）。
CBCT 结果检测到的解剖学变异可在植入前根据尺寸和位置，针对最佳部位和最佳植入体进行个性化治疗规划。
