Thirty titanium implants were inserted into bovine rib blocks. Twenty had standardized bone defects (10 with dehiscence and 10 with fenestration), while the remaining 10 were used as control group with no defects. Radiographic examinations held with high-definition CBCT (HD-CBCT) and LD-CBCT with and without application of MAR tool. Images were assessed by four examiners for the presence or absence of peri-implant defects. The area under the area under the receiver operating characteristic (ROC) curve (AUC), sensitivity, specificity, and accuracy were calculated for all radiographic protocols.
In the absence of MAR tool, there was no difference in AUC and diagnostic values between LD-CBCT and HD-CBCT for detection of both defects. When the MAR tool was applied, the AUC values, sensitivity, and accuracy were higher in HD-CBCT than in LD-CBCT for the detection of both defects, especially for the dehiscence, while specificity remained the same.
LD-CBCT can be used in the evaluation of peri-implant dehiscence and fenestration without any decrease in diagnostic accuracy. The application of MAR tool decrease the diagnostic ability of both defects, especially for the detection of dehiscence defects.
方法:将30个钛植入物插入牛肋骨块中。20例具有标准化的骨缺损(10例开裂,10例开窗),其余10例作为无缺陷的对照组。使用高清晰度CBCT(HD-CBCT)和LD-CBCT进行射线照相检查,无论是否使用MAR工具。由四名检查者评估图像是否存在植入物周围缺陷。受试者工作特征(ROC)曲线(AUC)下面积,灵敏度,特异性,并计算所有射线照相方案的准确性.
结果:在没有MAR工具的情况下,LD-CBCT和HD-CBCT检测两种缺陷的AUC和诊断价值无差异.应用MAR工具时,AUC值,灵敏度,对于两种缺陷的检测,HD-CBCT的准确性高于LD-CBCT,尤其是对于开裂,而特异性保持不变。
结论:LD-CBCT可用于评估种植体周围裂开和开窗,而不会降低诊断准确性。MAR工具的应用降低了两种缺陷的诊断能力,特别是用于检测开裂缺陷。