Abstract：
OBJECTIVE: To compare the mucosal morphological difference in distal-extension area of mandibular dentition defect taken by intra-oral digital scanning and selective pressure impression techniques.
METHODS: Seventeen patients with Kennedy Class I and Class II dentition defect in lower jaw were included, including twenty-two distal-extensions. Intraoral digital scanning and functional impression technique were taken in each patients, respectively. Laboratory cast scanner was used to scan the plaster casts made from the selective pressure impression to obtain the three-dimensional data. All the data were stored in STL format. The 3D data collecting from intra-oral digital scanning and selective pressure impression from the same patient were compared by Geomagic Control 2014 software. Root mean square of 2.5mm diameter area was calculated in 5,10,15 mm from terminal tooth. Pearson\'s correlation test was used to analyze the correlation of the distance and morphological difference with SPSS 20.0 software package.
RESULTS: Mean mucosal morphological difference of jaw distal-extension edentulous area taken by intra-oral digital scanning and selective pressure impression techniques was (0.37±0.12) mm. There was positive correlation between distance from terminal tooth and mucosal morphological difference(P＜0.05). Morphological differences in 5, 10, 15 mm from terminal tooth were (0.14±0.11) mm, (0.22±0.13) mm and (0.39±0.16) mm, respectively.
CONCLUSIONS: In this study, there was positive correlation between the length of distal-extension edentulous area and mucosal morphological difference, while the kind of ridge defect and mucosal thickness may also affect the morphological difference quantity.
METHODS: Seventeen patients with Kennedy Class I and Class II dentition defect in lower jaw were included, including twenty-two distal-extensions. Intraoral digital scanning and functional impression technique were taken in each patients, respectively. Laboratory cast scanner was used to scan the plaster casts made from the selective pressure impression to obtain the three-dimensional data. All the data were stored in STL format. The 3D data collecting from intra-oral digital scanning and selective pressure impression from the same patient were compared by Geomagic Control 2014 software. Root mean square of 2.5mm diameter area was calculated in 5,10,15 mm from terminal tooth. Pearson\'s correlation test was used to analyze the correlation of the distance and morphological difference with SPSS 20.0 software package.
RESULTS: Mean mucosal morphological difference of jaw distal-extension edentulous area taken by intra-oral digital scanning and selective pressure impression techniques was (0.37±0.12) mm. There was positive correlation between distance from terminal tooth and mucosal morphological difference(P＜0.05). Morphological differences in 5, 10, 15 mm from terminal tooth were (0.14±0.11) mm, (0.22±0.13) mm and (0.39±0.16) mm, respectively.
CONCLUSIONS: In this study, there was positive correlation between the length of distal-extension edentulous area and mucosal morphological difference, while the kind of ridge defect and mucosal thickness may also affect the morphological difference quantity.
摘要：
目的：比较口腔内数字扫描和选择性压力印模技术在下颌牙列缺损远端延伸区的粘膜形态差异。
方法：纳入17例KennedyI类和II类牙列缺损患者，包括22个远端延伸。每位患者均采用口内数字扫描和功能印模技术，分别。使用实验室铸模扫描仪扫描由选择性压力印模制成的石膏铸模，以获得三维数据。所有数据以STL格式存储。通过GeomagicControl2014软件比较了从同一患者的口腔内数字扫描和选择性压力印模收集的3D数据。在距末端牙齿5,10,15mm处计算2.5mm直径面积的均方根。采用Pearson相关检验,用SPSS20.0软件包分析距离与形态差异的相关性。
结果：通过口腔内数字扫描和选择性压力印模技术获取的颌骨远端延伸无牙区的平均粘膜形态差异为（0.37±0.12）mm。距终牙距离与粘膜形态差异呈正相关(P＜0.05).距终牙5、10、15mm的形态差异为(0.14±0.11)mm,(0.22±0.13)mm,(0.39±0.16)mm,分别。
结论：在这项研究中，远端延伸缺牙区长度与粘膜形态差异呈正相关，而脊缺损的种类和粘膜厚度也可能影响形态差异的数量。
方法：纳入17例KennedyI类和II类牙列缺损患者，包括22个远端延伸。每位患者均采用口内数字扫描和功能印模技术，分别。使用实验室铸模扫描仪扫描由选择性压力印模制成的石膏铸模，以获得三维数据。所有数据以STL格式存储。通过GeomagicControl2014软件比较了从同一患者的口腔内数字扫描和选择性压力印模收集的3D数据。在距末端牙齿5,10,15mm处计算2.5mm直径面积的均方根。采用Pearson相关检验,用SPSS20.0软件包分析距离与形态差异的相关性。
结果：通过口腔内数字扫描和选择性压力印模技术获取的颌骨远端延伸无牙区的平均粘膜形态差异为（0.37±0.12）mm。距终牙距离与粘膜形态差异呈正相关(P＜0.05).距终牙5、10、15mm的形态差异为(0.14±0.11)mm,(0.22±0.13)mm,(0.39±0.16)mm,分别。
结论：在这项研究中，远端延伸缺牙区长度与粘膜形态差异呈正相关，而脊缺损的种类和粘膜厚度也可能影响形态差异的数量。
