种植区CT骨密度与扭矩相关性研究

目的通过研究种植区CT骨密度值与扭矩值之间的关系来预测种植体的初期稳定性。由此通过CT扫描来决定该区骨质状况是否适合种植,制定出更加可靠的治疗计划。方法该样本选取了本院12例种植患者的58颗种植体。利用Simplant种植设计软件根据CT影像数据来选择种植位点并制作手术导板,通过软件来测量模拟种植体周围的CT平均骨密度值,通过手术导向模板引导钻孔,按既定的位置植入种植体。测量种植体旋入时所用的扭矩,统计骨密度值与扭矩值并分析两者之间的相关性。结果在临床病例的评估中,骨密度与扭矩之间有着很大的相关性,相关系数为0.671。结论通过术前CT分析及种植模拟可以定量种植位点的骨质,并预测种植体初期稳定性。由此可以帮助手术医师选择最合适的种植方位,种植类型以及外科种植技术,从而制定出更加可靠的治疗计划。

Investigation of correlation between computerized tomography values of the bone and cutting torque values at implant placement

Objective To predict the initial stability（bone quality） during implant placement by presurgical CT scan examinations and determine whether it can be quantified through examine the relationship between computerized tomography（CT） values of bone surrounding endosseous implants and the cutting torque values required for self-tapping during implant placement.Methods The study samples consisted of 12 subjects with 59 implants.Sites for implant placement was determined based on CT data by using implant planning software.The average CT values of the bone surrounding the simulated implants were calculated by the software.Using a stereolithographic drill guide,implants were placed at the locations indicated by the protocol.The cutting torque values required for seft-tapping were measured during implant placement.The resulting CT values and cutting torque values were analyzed statistically for correlation.Results The correlation between CT values and cutting torque values was strong in the clinical cases evaluated,and the correlation coefficient was 0.671.Conclusion These results indicate that it may be possible to predict and quantify initial implant stability and bone quality from presurgical CT diagnosis and implant simulation.It can help Surgery doctor to choose an optimum position,type and protocol for implant.