氧化锆单冠制作过程中使用硅橡胶复制法对咬合面形态的影响  

Study on occlusal morphology after CAD/CAM zirconia restoration using silicone replica method

作　　者：王金平[1,2] 赵彬[1] 曹婷婷[1] 王华[1] 

机构地区：[1]山西医科大学口腔医学系,太原030001 [2]太原市中心医院口腔科

出　　处：《山西医科大学学报》2013年第7期565-569,589,共6页Journal of Shanxi Medical University

基　　金：太原市科技项目大学生创新创业专题基金资助项目(120164084)

摘　　要：目的应用硅橡胶复制法建立一种个性化氧化锆单冠的设计制作方法,评价该方法对其咬合面形态的影响。方法用超硬石膏翻制日进标准树脂模型8副作为对照组。将左侧上颌第一磨牙对应的标准全瓷冠树脂预备体就位于该树脂模型上并翻制超硬石膏模型48副,采用随机数字表法,24副模型用于修复体咬合面形态测量,24副模型用于修复体制作,其中个性化组、一次加工成型组、两次加工成型组各选取8副,分别制作8个氧化锆单冠。应用数字化牙颌模型的三维咬合分析方法评价修复体咬合接触分布及面积,并与对照组进行比较。结果个性化组在检测距离分别为16μm、40μm的咬合接触面积与对照组差异无统计学意义(P>0.05),在距离为100μm的咬合接触面积小于对照组(P<0.05),但较其他两组更接近于对照组。其他两组咬合接触面积均显著小于对照组(P<0.001)。个性化组(87.5%稳定的咬合接触)咬合接触的分布和形态与对照组(100%稳定的咬合接触)基本相符。结论用硅橡胶复制法并结合CAD/CAM技术制作的个性化氧化锆单冠咬合面形态较传统方法更接近于原始牙。Objective To establish an individualized CAD/CAM zirconia restoration method using silicon replica and investigate its effect on occlusal morphology. Methods Eight super-hard plaster models were created from a set of standardized dental resin model produced by Nissin as controls.A standard all-ceramic FDP of left maxillary first molar was accommodated on the set of standardized dental resin model,and then forty-eight super-hard plaster models were created and divided into two groups.Twenty-four of them were selected randomly to evaluate the occlusal morphology.And the other twenty-four were used to fabricate CAD/CAM zirconia restorations,and divided into three groups：individualized group,one-molding-processing group,two-molding-processing group.The distribution and area of occlusal contact were investigated using three-dimensional analysis method for digital dental casts and compared with control group.Results The areas of occlusal contact showed no significant difference between individualized group and control group at maximum intermaxillary distance of 16 μm and 40 μm（P 0.05）.The areas of occlusal contact in individualized group at maximum intermaxillary distance of 100 μm were less than that in control group（P 0.05）.Statistically significant difference was found in areas of occlusal contact between the other two groups and control group（P 0.001）.The distribution and areas of occlusal contact in individualized group（occlusal stabilization 87.5%） and control group（occlusal stabilization 100%） were mostly consistent.Conclusion CAD /CAM technique combined with silicone replica method enables a closer reconstruction of teeth than traditional one-molding-processing and two-molding-processing method.

关 键 词：CAD CAM 氧化锆 咬合面 三维 数字化 

分 类 号：R783[医药卫生—口腔医学]