Bagis Nilsun, Eren Hakan, Kolsuz Mehmet Eray, Kurt Mehmet Hakan, Avsever Hakan, Orhan Kaan
Faculty of Dentistry, Department of Periodontology, Ankara University, Ankara, Turkey.
Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Ankara University, Ankara, Turkey.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2018 Mar;125(3):260-267. doi: 10.1016/j.oooo.2017.11.010. Epub 2017 Nov 23.
This study assessed the use of different voxel resolutions in a cone beam computed tomography (CBCT) unit for the detection of artificially induced periodontal bone defects created using burr, burr and chemicals, and only chemicals.
Seven dry skulls were used in this study. In total, 65 dehiscence defects, 43 fenestration defects, and 76 control sites with no periodontal defects were examined. Images were obtained from a CBCT unit (3 D Accuitomo; J Morita Mfg. Corp., Kyoto, Japan), using 3 field-of-view (FOV) sizes (4 × 4 cm; 6 × 6 cm; and 8 × 8 cm) and 4 scan modes (standard, high-definition, high-fidelity, and low-dose).
Overall, κ coefficients for interobserver agreement on burr-induced periodontal defects ranged from 0.336 to 0.795, with the lowest κ value (indicating a fair degree of agreement) obtained for images acquired in standard mode with a voxel size of 0.160 mm. κ coefficients for the detection of periodontal defects were highest (indicating moderate to high degrees of interobserver agreement) for smaller voxel sizes and high-resolution images. Statistical comparison among groups (burr, burr + chemicals, and chemicals only) was performed using 1-way analysis of variance with post hoc tests.
The CBCT scan mode may affect the diagnosis of periodontal defects. The technique used to create periodontal defects also affected diagnosis. For this kind of experiment, burr-induced or burr + chemical-induced defects should be used, rather than those induced solely using a chemical technique.
本研究评估了在锥形束计算机断层扫描（CBCT）设备中使用不同体素分辨率检测使用牙钻、牙钻加化学物质以及仅使用化学物质制造的人工诱导牙周骨缺损的情况。
本研究使用了七个干燥颅骨。总共检查了65个骨裂缺损、43个开窗缺损以及76个无牙周缺损的对照部位。使用CBCT设备（3D Accuitomo；日本京都森田制造公司）获取图像，采用3种视野（FOV）尺寸（4×4厘米；6×6厘米；8×8厘米）和4种扫描模式（标准、高清、高保真和低剂量）。
总体而言，观察者间对牙钻诱导的牙周缺损一致性的κ系数范围为0.336至0.795，其中在标准模式下以0.160毫米体素大小获取的图像κ值最低（表明一致性程度一般）。对于较小体素大小和高分辨率图像，牙周缺损检测的κ系数最高（表明观察者间一致性程度为中度至高）。使用单因素方差分析及事后检验对各组（牙钻、牙钻+化学物质、仅化学物质）进行统计学比较。
CBCT扫描模式可能影响牙周缺损的诊断。制造牙周缺损所使用的技术也会影响诊断。对于此类实验，应使用牙钻诱导或牙钻+化学物质诱导的缺损，而非仅使用化学技术诱导的缺损。
