下颌后牙区骨皮质厚度对牙种植精度的影响

Influence of cortical bone thickness in mandibular posterior region on the accuracy of implantation

目的 探讨下颌后牙区局部骨皮质厚度(cortical bone thickness,CBT)对牙种植精度的影响。方法 纳入2020年6—12月间就诊于中国科学技术大学附属第一医院口腔医学中心的下颌后牙区牙种植患者30例,平均年龄43.1岁,共植入种植体37枚。于术后CBCT中测量种植体颈部颊、舌侧CBT并计算均值,将均值分为两组(A组为CBT≥1.5 mm;B组为CBT<1.5 mm)并分析各种植体植入顶点、末端及角度偏差。结果 CBT≥1.5 mm组的牙种植精度在植入顶点、植入末端及植入角度方面均优于CBT<1.5 mm组(P<0.05)。结论 种植区骨皮质厚度较低时,牙种植精度可能降低,因此临床上对于此类患者应更加谨慎对待。

Objective To investigate the influence of cortical bone thickness(CBT) in mandibular posterior region on dental implantation accuracy.Methods A total of 30 patients at an average age of 43.1 with 37 implants in mandibular posterior dental area who were admitted to Stomatology Center of the First Affiliated Hospital of University of Science and Technology of China from June to December 2020 were included.CBT of bone in the implant area was measured in postoperative CBCT,and implants were divided into two groups according to CBT(group A,CBT≥1.5 mm;group B,CBT<1.5 mm).The deviation of implantations in the implant neck and apex as well as the angular errors were analyzed with precision verification software.Results The implant accuracy of CBT≥1.5 mm group was better than that of CBT<1.5 mm group in terms of implant point,implant end and implant angle(P<0.05).Conclusion When the thickness of bone cortex in the proposed planting area is low,precision of dental implantation may be reduced.Therefore,such patients should be treated with more caution in clinical practice.