Statement of problem

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.

Purpose

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.

Material and methods

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.

Results

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.

Conclusions

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.

中文翻译：

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扫描体曝光和操作员对植入物压痕与扫描体图像匹配精度的影响。

问题陈述

扫描图像与扫描体设计的精确匹配对于复制软件程序中的实际植入位置至关重要。在扫描体的扫描部分部分地嵌入牙龈组织中的情况下，尚未弄清扫描图像不足对图像匹配精度的影响。

目的

这项体外研究的目的是检查扫描体曝光和不同操作员对扫描体图像匹配精度的影响。

材料与方法

将六组具有不同扫描体曝光（完全曝光，分别减少0.5毫米，1.0毫米，1.5毫米，2.0毫米和2.5毫米的曝光）的数字化，然后将扫描图像转移到CAD软件程序中，进行扫描设计身体与每组的扫描图像相匹配。根据扫描主体设计的位置，创建了虚拟植入物。由2个操作员对每个组进行7次图像匹配处理（N = 84）。对虚拟植入物的线性和角度偏差进行了三维分析。使用双向方差分析，当量和一致性相关系数统计数据来验证扫描体曝光和算子对图像匹配的影响。

结果

随着扫描体的暴露减少，植入物位置的偏差明显增加（P <.001）。一致性相关系数表明两个运算符之间有很强的一致性。

结论

减少扫描体的曝光量会严重影响软件程序中植入物定位的准确性。操作员差异可能不会影响扫描身体图像匹配的准确性。