摘要
目的：评估不同牙体组织厚度和窝洞深度对内冠修复中口内扫描仪（IOS）准确性的影响。
方法：使用下颌牙模模型，左侧下颌第一磨牙替换为提取的人体真实牙齿。制备具有不同深度（3.5 mm和5 mm）和剩余壁厚度（1.5 mm和0.5 mm）的内冠窝洞。使用高精度外口扫描仪扫描主模型，数据导出为STL格式。每组使用TRIOS 3 IOS进行十次口内扫描。在Geomagic Design X软件中，使用均方根（RMS）值分析真度，使用四分位距（IQR）分析精密度。使用独立样本T检验和单因素方差分析检验各组间RMS值的差异。
结果：不同窝洞深度和剩余牙体组织厚度的组别之间，RMS和IQR值存在显著差异（P< 0.001）。剩余牙体结构较薄且窝洞较深的组别表现出更大的偏差，表明扫描准确性降低。
临床意义：窝洞深度和牙体组织厚度显著影响内冠修复中口内扫描仪的准确性。
原文摘要
PURPOSE: To evaluate the effects of different tooth structure thicknesses and cavity depths on the accuracy of intraoral scanners (IOS) in endocrown restorations.
METHODS: A mandibular typodont model was used, with the left mandibular first molar replaced by an extracted real human tooth. Endocrown cavities with varying depths (3.5 mm and 5 mm) and remaining wall thicknesses (1.5 mm and 0.5 mm) were prepared. Master models were scanned using a high-precision extraoral scanner, and the data were exported in STL format. Ten intraoral scans were performed for each group using the TRIOS 3 IOS. Scanning accuracy was analyzed using the Root Mean Square (RMS) value for trueness and the Interquartile Range (IQR) for precision in Geomagic Design X software. The differences in RMS values among the groups were examined using Independent Samples T test and one-way ANOVA test.
RESULTS: Significant differences in RMS and IQR values were observed between groups with different cavity depths and remaining tooth structure thicknesses (P< 0.001). Groups with thinner remaining tooth structures and deeper cavities exhibited greater deviations, indicating reduced scanning accuracy.
CLINICAL SIGNIFICANCE: Cavity depth and tooth structure thickness significantly influenced the accuracy of intraoral scanners in endocrown restorations.
出处
American journal of dentistry 2026;39(4):211-216.
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