摘要
目的：通过体外实验探讨Kennedy分类下四种缺牙间隙长度对数字印迹整体精度、准确度和线性精度的影响。
方法：根据Kennedy分类构建四种类型的无牙颌模型，每类制作3个不同缺牙数量的物理模型，共12个模型。使用台式扫描仪收集参考数据，使用数字口内扫描仪获取实验数据。在所有模型的缺牙间隙中点粘结直径为3 mm的氧化锆球，并重复上述扫描过程。使用Geomagic Wrap 2021软件对扫描数据进行对比分析。
结果：各组间精度无显著差异（P＞0.05）。Kennedy I组准确度随缺牙间隙长度增加而显著降低；Kennedy II组中最小缺牙间隙组的准确度显著优于最大缺牙间隙组。Kennedy III和IV组中，最小缺牙间隙组的准确度显著优于其他两组。按缺失牙数量分组时，Kennedy III组整体精度最佳。线性精度分析显示，Kennedy I组最小缺牙间隙组线性精度最优；Kennedy II-IV组中，线性精度随缺牙间隙长度增加而降低。按缺失牙数量分组时，Kennedy III和IV组表现出更好的线性精度（P＜0.05）。
结论：缺牙间隙长度对数字印迹精度有显著影响，总体趋势是随着间隙长度增加，数字印迹的整体精度和线性精度相应下降。游离端缺牙导致数字印迹的整体精度和线性精度降低。当缺失牙位于牙弓前部时，数字印迹的线性精度较高。
原文摘要
PURPOSE: To investigate the effect of 4 edentulous space lengths under Kennedy classification on the overall precision, accuracy and linear precision of digital impressions through in vitro experiments.
METHODS: Four types of edentulous models were constructed according to Kennedy classification, with 3 physical models of different edentulous numbers made for each classification, totaling 12 models. A desktop scanner was used to collect reference data, and a digital intraoral scanner was adopted to obtain experimental data. Zirconia balls with a diameter of 3 mm were bonded to the midpoints of the edentulous spaces of all models, and the above scanning process was repeated. Geomagic Wrap 2021 software was used for comparative analysis of the scanning data.
RESULTS: There was no significant difference in precision among the groups (P＞0.05). The accuracy of Kennedy Ⅰ group decreased significantly with the increase of edentulous space length, the accuracy of the group with the smallest edentulous space in Kennedy Ⅱ group was significantly better than that of the group with the largest edentulous space. In Kennedy Ⅲ and Ⅳ group, the accuracy of the group with the smallest edentulous space was significantly better than that of the other two groups. When grouping by the number of missing teeth, Kennedy Ⅲ group showed the best overall precision. Linear precision analysis revealed that the group with the smallest edentulous space in Kennedy Ⅰ group had the optimal linear precision; in Kennedy Ⅱ-Ⅳ groups, the linear precision decreased with the increase of edentulous space length. Kennedy Ⅲ and Ⅳ group showed better linear precision when grouping by the number of missing teeth(P＜0.05).
CONCLUSIONS: The length of edentulous space has significant effect on the precision of digital impressions, with the overall trend that as the space length increases, the overall precision and linear precision of digital impressions decrease accordingly. The presence of free-end edentulism leads to a decrease in the overall precision and linear precision of digital impressions. The linear precision of digital impressions is higher when the missing teeth are located in the anterior part of the dental arch.
出处
Shanghai journal of stomatology 2026;35(3):258-264.
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