不同磨耗程度的下颌第一磨牙咬合接触区域的口内扫描精度对比

发布时间：2018-04-27 10:50

本文选题：Cerec系统 + 咬合接触　；参考：《南昌大学》2016年硕士论文

【摘要】：目的:对比研究Cerec系统对轻、中度磨耗下颌第一磨牙口内咬合接触的扫描精度差异,并探讨轻、中度磨耗下颌第一磨牙咬合接触区域的分布差异,为Cerec椅旁系统制作的修复体咬合接触精度的提高及临床调牙合提供理论依据。方法:选取2015年5月至2015年12月来我院修复科就诊或进行口腔咨询的患者,知情同意后按照Smith and Knight磨耗指数标准,对受检者的下颌第一磨牙咬合面进行磨耗程度分类;依据纳入标准选择其中42名受检者的84颗牙齿作为研究对象,按照磨耗程度分组,I组为轻度磨耗组,II组为中度磨耗组,使用Cerec Omnicam系统对受检者进行口内光学印模,通过Inlab软件获取下颌第一磨牙的虚拟咬合接触分布图像;使用40μm厚度宝诗咬合纸在受检者口内进行牙尖交错位紧咬合,Canon EOS 600D数码单反相机拍摄下颌第一磨牙口内咬合接触印迹图像,利用Adobe Photoshop CS6图像软件分析轻、中度磨耗下颌第一磨牙咬合接触区域分布差异,并计算虚拟咬合与口内咬合接触区域的重叠率,评估Cerec系统对两种磨耗程度的下颌第一磨牙口内咬合接触的扫描精度。结果:1、轻度磨耗组的牙尖交错位咬合接触分布区域主要分布于远中尖顶及近远中舌斜面、远中颊尖顶及近远中舌斜面、近中颊尖顶及近远中舌斜面、远中舌尖远中颊斜面和牙合面远中边缘嵴,中度磨耗组咬合接触区域则分布于下颌第一磨牙的远中尖顶及近远中舌斜面、远中颊尖顶及近远中舌斜面、近中颊尖顶及近远中舌斜面、远中舌尖远中颊斜面、中央窝和牙合面近远中边缘嵴,两组间的咬合接触分布区域差异具有统计学意义(p0.05);2、轻度磨耗组咬合接触区域重叠率为86.68±1.41,中度磨耗组的咬合接触区域重叠率为87.60±2.06,中度磨耗组咬合接触区域的重叠率要高于轻度磨耗组,差异具有统计学意义(p0.05)。结论:1、轻度磨耗组下颌第一磨牙牙尖交错位咬合接触区域分布较为集中,咬合接触区域多分布于功能尖顶及其牙尖斜面和远中边缘嵴,随着磨耗程度的加深,咬合接触分布范围扩大,相比轻度磨耗组,中度磨耗组中的下颌第一磨牙咬合接触增加了中央窝和近中边缘嵴两个咬合接触区域;2、Cerec椅旁系统对中度磨耗组的下颌第一磨牙牙尖交错位咬合接触的扫描精度高于轻度磨耗组。
[Abstract]:Objective: to compare the scanning accuracy of Cerec system between mild and moderate wear mandibular first molar intraoral occlusal contact, and to explore the distribution of the first mandibular first molar occlusion contact area between mild and moderate wear. It provides a theoretical basis for the improvement of occlusal contact accuracy and clinical occlusal adjustment of prosthesis made by Cerec chair system. Methods: from May 2015 to December 2015, the patients who were admitted to our hospital from May 2015 to December 2015 for oral consultation were selected. According to the Smith and Knight wear index standard, the first mandibular molar occlusal surface was classified according to the degree of wear. According to the inclusion criteria, 84 teeth of 42 subjects were selected as study objects. According to the degree of wear, group I was divided into mild wear group and moderate wear group. Cerec Omnicam system was used to carry out intraoral optical impression on the subjects. The virtual occlusal contact distribution images of mandibular first molar were obtained by Inlab software. A 40 渭 m thick Baoshi bite paper was used to capture the first mandibular first molar intraoral occlusal contact imprinting image with interlocking occlusal canon EOS 600D digital SLR camera, and Adobe Photoshop CS6 image software was used to analyze the light. The distribution of the first mandibular first molar occlusal contact area was different, and the overlap rate between the virtual occlusion and the intraoral occlusion was calculated to evaluate the scanning accuracy of the Cerec system for the occlusion of the first mandibular first molar. Results in the mild attrition group, the occlusal contact area in the interlocking position of the cusp was mainly distributed on the distal tip and the proximal middle tongue, the distal buccal tip and the proximal middle tongue, the proximal middle buccal tip and the proximal distal lingual oblique. The distal tip of the tongue and the distal marginal ridge of the occlusal surface were distributed in the distal tip of the first mandibular molars and the proximal distal oblique surface of the tongue, the distal buccal tip and the proximal distal oblique surface of the tongue in the moderate attrition group, while in the moderate attrition group, the occlusal contact area was located on the distal tip of the first mandibular molars and the proximal distal lingual oblique plane. The apex of the mesiobuccal canine and the oblique surface of the proximal middle tongue, the distal tip of the tongue, the central fossa and the occlusal surface near the distal marginal ridge, The difference of occlusal contact area between the two groups was statistically significant (p 0.05). The overlap rate of occlusal contact area was 86.68 卤1.41 in mild wear group, 87.60 卤2.06 in moderate wear group, and 87.60 卤2.06 in moderate wear group. The overlap rate of occlusal contact area in moderate wear group was 87.60 卤2.06.The overlap rate of occlusion contact area was 86.68 卤1.41 in mild wear group. Higher than the mild wear group, The difference was statistically significant (P 0.05). Conclusion the occlusal contact area of the mandibular first molar cusp in the mild wear group was more concentrated, and the occlusal contact area was mostly distributed in the functional cusp, its cusp inclined plane and distal marginal ridge, and with the increase of wear degree, the occlusal contact area of the mandibular first molar was more concentrated than that of the control group. The distribution of occlusal contact was wider than that of mild wear group. The occlusal contact of the mandibular first molar in the moderate wear group increased the scanning accuracy of the occlusal contact between the central fossa and the proximal marginal ridge of the mandibular first molar in the interlocking position of the mandibular first molar in the moderate wear group was higher than that in the mild wear group.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：R783

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