Vedpathak Priyanka Ramesh, Gondivkar Shailesh Madhukar, Bhoosreddy Ajay Ramesh, Shah Karan Rajendra, Verma Gaurav Ravishankar, Mehrotra Gayatri Praveen, Nerkar Ashwini Chandrakant
Postgraduate Student, Department of Oral Medicine and Radiology, MGV's KBH Dental College and Hospital , Nashik, Maharashtra, India .
Assistant Professor, Department of Oral Medicine & Radiology, Government Dental College and Hospital , Nagpur, Maharashtra, India .
J Clin Diagn Res. 2016 Aug;10(8):ZC10-3. doi: 10.7860/JCDR/2016/18589.8228. Epub 2016 Aug 1.
Caries under restorations is the most common reason for re-treatment and replacement in restorative failures. To avoid failures of fixed dental prostheses, it is important to diagnose caries under it earlier. Without image degradation and metal artifacts, Cone Beam Computed Tomography (CBCT) can be the solution to detect caries without removing fixed dental prostheses.
The aim of this study was to determine the efficacy of CBCT in detecting caries under fixed dental prostheses.
Each specimen was scanned with CBCT for evaluation of secondary caries under fixed prostheses. Exposure parameters were 60 kVp and 3mA. Field of View (FOV) used was 8cm X 8cm. According to International Caries Detection and Assessment System (ICDAS) criteria, six Grade 6 carious extracted teeth were selected. All teeth were prepared with four different specimens - full metal, metal-ceramic, full ceramic and metal-acrylic crowns for each tooth. Each specimen was scanned by CBCT. T-test was performed for mean gray value differences between caries and noncaries regions of each material. Gray values were recorded and evaluated for different parameters using two-way analysis of variance.
Significant differences were found with respect to material (full metal, metal-ceramic, full ceramic and metal-acrylic) and situation (caries/noncaries) (p<0.001). There were no significant differences with respect to location (anterior or posterior). Mean gray values of caries and noncaries regions were found to be different for each material.
CBCT can be used as a post-treatment diagnostic technique for detecting caries under fixed prostheses without removing it.
修复体下的龋齿是修复失败后重新治疗和更换的最常见原因。为避免固定义齿失败，早期诊断其下方的龋齿很重要。在不出现图像降解和金属伪影的情况下，锥形束计算机断层扫描（CBCT）可以成为在不拆除固定义齿的情况下检测龋齿的解决方案。
本研究的目的是确定CBCT在检测固定义齿下方龋齿方面的有效性。
每个标本均用CBCT扫描，以评估固定修复体下方的继发龋。曝光参数为60 kVp和3mA。使用的视野（FOV）为8cm×8cm。根据国际龋病检测与评估系统（ICDAS）标准，选择了六颗6级龋坏的拔除牙齿。每颗牙齿均制备了四种不同的标本——全金属、金属陶瓷、全陶瓷和金属丙烯酸冠。每个标本均用CBCT扫描。对每种材料的龋损和非龋损区域之间的平均灰度值差异进行t检验。记录灰度值，并使用双向方差分析对不同参数进行评估。
在材料（全金属、金属陶瓷、全陶瓷和金属丙烯酸）和情况（龋坏/非龋坏）方面发现了显著差异（p<0.001）。在位置（前部或后部）方面没有显著差异。发现每种材料的龋损和非龋损区域的平均灰度值不同。
CBCT可作为一种治疗后诊断技术，用于在不拆除固定修复体 的情况下检测其下方的龋齿。
