Graduate student, Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
Professor, Department of Statistics, Kyungpook National University, Daegu, Republic of Korea.
J Prosthet Dent. 2020 Sep;124(3):379.e1-379.e6. doi: 10.1016/j.prosdent.2020.04.004. Epub 2020 Jul 4.
Accurate image matching of the scan with the design of the scan body is essential to replicate the actual implant position in the software program. In situations where the scan part of the scan body is partially embedded in the gingival tissue, the influence of the scan image deficiency on the accuracy of image matching has not been clarified.
The purpose of this in vitro study was to examine the effects of scan body exposure and different operators on the accuracy of image matching of the scan body.
Six groups with different scan body exposures (fully exposed, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, and 2.5 mm less exposed) were digitized, and the scan images were transferred to a CAD software program, where the design of the scan body was matched to the scan image of each group. Based on the position of the scan body design, a virtual implant was created. The image matching process was performed 7 times for each group by 2 operators (N=84). The linear and angular deviations of the virtual implants were analyzed 3-dimensionally. Two-way ANOVA, equivalence, and concordance correlation coefficient statistics were used to verify the effects of scan body exposure and operator on the image matching.
As the exposure of the scan body was reduced, the deviations in implant positioning were significantly increased (P<.001). The concordance correlation coefficient indicated strong agreement between the 2 operators.
Reduced exposure of the scan body significantly influenced the accuracy of implant positioning in the software program. Operator differences may not affect the accuracy of scan body image matching.
准确匹配扫描件与扫描体设计对于在软件程序中复制实际植入物位置至关重要。在扫描体的扫描部分部分嵌入牙龈组织的情况下，扫描图像缺陷对图像匹配准确性的影响尚未明确。
本体外研究的目的是检查扫描体暴露程度和不同操作人员对扫描体图像匹配准确性的影响。
将 6 组具有不同扫描体暴露程度（完全暴露、0.5 毫米、1.0 毫米、1.5 毫米、2.0 毫米和 2.5 毫米暴露较少）的扫描体进行数字化，并将扫描图像传输到 CAD 软件程序中，在该程序中，将扫描体的设计与每组的扫描图像匹配。根据扫描体设计的位置，创建一个虚拟植入物。对每个组由 2 名操作人员（N=84）进行 7 次图像匹配过程。对虚拟植入物的线性和角度偏差进行三维分析。使用双向方差分析、等效性和一致性相关系数统计来验证扫描体暴露和操作人员对图像匹配的影响。
随着扫描体暴露程度的降低，植入物定位的偏差显著增加（P<.001）。一致性相关系数表明 2 名操作人员之间具有很强的一致性。
扫描体暴露程度的降低显著影响了软件程序中植入物定位的准确性。操作人员的差异可能不会影响扫描体图像匹配的准确性。
