BACKGROUND The purpose of this study was to investigate the trueness of intraoral scanning of residual ridge in edentulous regions during in vitro evaluation of inter-operator validity. METHODS Both edentulous maxillary and partially edentulous mandibular models were selected as a simulation model. As reference data, scanning of two models was performed using a dental laboratory scanner (D900, 3Shape A/S). Five dentists used an intraoral scanner (TRIOS 2, 3Shape A/S) five times to capture intraoral scanner data, and the "zig-zag" scanning technique was used. They did not have experience with using intraoral scanners in clinical treatment. The intraoral scanner data was overlapped with the reference data (Dental System, 3Shape A/S). Regarding differences that occurred between the reference and intraoral scanner data, the vertical maximum distance of the difference and the integral value obtained by integrating the total distance were analyzed. RESULTS In terms of the maximum distances of the difference on the maxillary model, the means of five operators were as follows: premolar region, 0.30 mm; molar region, 0.18 mm; and midline region, 0.18 mm. The integral values were as follows: premolar region, 4.17 mm2; molar region, 6.82 mm2; and midline region, 4.70 mm2. Significant inter-operator differences were observed with regard to the integral values of the distance in the premolar and midline regions and with regard to the maximum distance in the premolar region, respectively. The maximum distances of the difference in the free end saddles on mandibular model were as follows: right side, 0.05 mm; and left side, 0.08 mm. The areas were as follows: right side, 0.78 mm2; and left side, 1.60 mm2. No significant inter-operator differences were observed in either region. CONCLUSIONS The present study demonstrated satisfactory trueness of intraoral scanning of the residual ridge in edentulous regions during in vitro evaluation of inter-operator validity.

中文翻译：

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将口腔内扫描仪应用于无牙区域的残留脊：体外评估操作者之间的有效性，以确认真实性。

背景技术这项研究的目的是调查在对操作者之间的有效性进行体外评估时，对无牙区域残留进行口腔内扫描的真实性。方法选择无牙颌上颌模型和部分无牙颌模型作为仿真模型。作为参考数据，使用牙科实验室扫描仪（D900，3Shape A / S）进行了两种模型的扫描。五名牙医五次使用口腔扫描仪（TRIOS 2、3Shape A / S）捕获口腔扫描仪数据，并使用“之字形”扫描技术。他们没有在临床治疗中使用口内扫描仪的经验。口内扫描仪数据与参考数据（Dental System，3Shape A / S）重叠。关于参考和口内扫描仪数据之间的差异，分析了差的垂直最大距离和对总距离求积分得到的积分值。结果就上颌骨模型的最大距离差异而言，五名操作者的平均值为：前磨牙区，0.30 mm；上颌磨牙区。摩尔区，0.18 mm; 中线区域为0.18毫米。积分值如下：前磨牙区，4.17mm 2；磨牙区。摩尔区，6.82 mm2; 中线区域为4.70平方毫米。在前磨牙和中线区域的距离的积分值以及在前磨牙区域的最大距离方面，观察到明显的操作者间差异。下颌模型的自由端鞍座之间的最大差异距离如下：右侧为0.05毫米；右侧为0.05毫米。左侧为0.08毫米。区域如下：右侧，0.78平方毫米; 左侧为1.60平方毫米。在两个区域中均未观察到操作员之间的显着差异。结论本研究证明了在对操作者之间的有效性进行体外评估的过程中，对无牙区域残留脊的口腔内扫描的真实性令人满意。