口内扫描数字化模型用于评价慢性牙周炎患者牙龈软组织区域准确度的初步研究

摘要

Objective To explore the relation between precision of intraoral scanning digitized model's evaluation on gingival paren-chyma,and pocket depth,gingivitis inflammation degree,arch width, and anatomical position, thereby providing experimental refer-ence for clinical application. Methods 30 patients with chronic periodontitis who had undergone supragingival scaling and periodontal probing examination were selected to obtain traditional plaster models. 3Shape Trios intraoral scanner was used for intraoral scanning to obtain digitized models.3Shape D810 was used to scan plaster model and the scanning result was translated into STL-format file,which was imported into Geomagic Qualify 2012 software,to compare the 3D deviation value of gingiva, incisor, premolar teeth, molar and gingival parenchyma of full dentition in two types of models.The one-sample t-test,chi-square test,Pearson correlation coefficient were used to analyze the relation between 3D deviation magnitude of gingiva and pocket depth(PD),gingivitis inflammation degree and arch width of each probed site. The variance analysis in method of randomized blocks design was adopted to analyze whether digitized models for anatomical position were different in gingival accuracy,and Tukey test was used to make a further pairwise analysis. Results The 3D deviation magnitude between intraoral scanning digitized model and traditional plaster model was not correlated to pocket depth,gin-givitis inflammation degree or arch width(P>0.05),but was correlated to anatomical position of teeth. The precision of molar region was lower compared with incisor and premolar region. Conclusion The intraoral scanning digitized model can be an alternative to tra-ditional plaster model in terms of gingival tissue and is clinically applicable.%目的 探索口内扫描数字化模型牙龈软组织准确度与牙周袋深度、牙龈炎症程度、牙弓宽度以及解剖位置等因素的关系,为临床应用提供实验依据.方法 选取30例已接受龈上洁治术及牙周探诊检查的慢性牙周炎患者,获取传统石膏模型.3Shape Trios口内扫描仪口内扫描获得数字化模型.3Shape D810对石膏模型进行扫描,最终转化为STL格式文件,导入Geomagic Qualify 2012软件中,分别比较探诊位点牙龈、切牙、前磨牙、磨牙牙龈及全牙列牙龈软组织两种模型的3D偏差值.使用单样本t检验、卡方检验、Pearson相关系数分析牙龈3D偏差大小与各探诊位点的牙周袋深度(PD)、牙龈炎症程度以及牙弓宽度的关系.随机区组设计的方差分析用于分析不同解剖位置数字化模型牙龈准确度有无差异,用Tukey检验进一步进行两两分析.结果 口内扫描数字化模型与传统石膏模型的3D偏差大小与牙周袋深度、牙龈炎症程度、牙弓宽度无关(P>0.05),与牙齿解剖位置有关(P<0.01),磨牙区域准确度相较于切牙和前磨牙区域降低.结论 口内扫描数字化模型在牙龈组织方面可以代替传统石膏模型应用于临床.