南方医科大学学报

南方医科大学学报 ›› 2023, Vol. 43 ›› Issue (11): 1941-1946.doi: 10.12122/j.issn.1673-4254.2023.11.15

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不同牙位及髓腔固位型深度影响髓超嵌体口内数字印模精度的体外分析

甘红琴，孙舒雨，田瑞雪，刘 芳，李建成，谢小飞   

  1. 蚌埠医学院第一附属医院口腔科，安徽 蚌埠 233000
  • 出版日期:2023-11-20 发布日期:2023-12-08

In vitro analysis of the influence of different tooth positions and retention depths of the pulp cavity on the accuracy of digital impression of the endocrown

GAN Hongqin, SUN Shuyu, TIAN Ruixue, LIU Fang, LI Jiancheng, XIE Xiaofei   

  1. Department of Stomatology, First Affiliated Hospital of Bengbu Medical College, Bengbu 233000, China
  • Online:2023-11-20 Published:2023-12-08

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摘要： 目的 评价牙齿位置和髓腔固位型深度对髓超嵌体口内数字印模准确性的影响。方法 选取右上颌第1磨牙（16）和右下颌第1磨牙（46）的解剖牙树脂模型各4颗，在模型牙上制备髓腔固位型深度为2、3、4、5 mm的髓超嵌体预备体。使用显微CT获得8个参考扫描。导出所有扫描数据，通过Mimics 2021软件三维重建获得参考模型。使用口腔扫描仪获得了每个髓超嵌体预备体的10个数字印模为实验模型。使用3D分析软件Gomagic Wrap 2017进行三维模型的对比分析。计算平均绝对偏差值，以评估数字模型的精确度。结果 以牙位分组时：16的真实度与46的真实度没有显著差异。16的精确度与46的精确度没有显著差异。两牙齿间16平均最大正偏差和负偏差显著小于46（P<0.05），而两颗牙齿各自的平均最大正偏差大于平均最大负偏差（P<0.05）。以洞型深度分组时：5 mm组的真实度显著低于2 mm组、3 mm组及4 mm组（P<0.05）。精确度方面2 mm组显著高于4 mm组及5 mm组（P<0.05），3 mm组显著高于5 mm组（P<0.05）。平均最大正偏差和平均最大负偏差在2 mm组显著低于5 mm组（P<0.05），与其余两组相差较小。结论 牙齿位置对髓超嵌体口内数字印模真实度存在影响，髓腔固位型深度对髓超嵌体口内数字印模精确度有所影响，且大体趋势为随着深度的增加偏差随之变大。

关键词: 髓超嵌体；数字印模；髓腔固位形；显微CT

Abstract: Objective To evaluate the influence of tooth position and retention depth of the dental pulp cavity on the accuracy of intraoral digital impression of endocrown preparation. Methods Dental pulp cavities with retention depths of 2, 3, 4 and 5 mm were prepared on 8 auatomic resin tooth models, including 4 right maxillary first molar (16) and 4 right mandibular first molar (46). Each cavity were scanned for 10 times using 3shape trios3, with micro-CT scans as the reference. All the scan data were exported, and the reference models were obtained by 3D reconstruction with Mimics 2021 software. Gomagic Wrap 2017 was used to analyze the 3D models. The average absolute deviation values were calculated to evaluate the accuracy of the digital models. Results There was no significant difference in the authenticity and precision between models 16 and 46. The mean maximum positive and negative deviations of the model 16 were less than those of the model 46 (P<0.05), and for both the models 16 and 46, the mean maximum positive deviation was significantly greater than the mean maximum negative deviation (P<0.05). The authenticity of the 5 mm group was lower than that of the 2 mm, 3 mm and 4 mm groups (P<0.05). The precision was higher in 2 mm group than in 4 mm and 5 mm groups (P<0.05), and higher in 3 mm group than in 5 mm group (P<0.05). The mean maximum positive and negative deviations in 2 mm group were lower than those in 5 mm group (P<0.05). Conclusion The position of teeth has little influence on intraoral digital impression of the endocrown. The retention depth of the dental pulp cavity affects the accuracy of intraoral digital impression of the endocrown, and a greater depth results in a greater deviation.

Key words: endocrown; digital impressions; pulp retention form; micro-CT