牙科金属铸造修复体内部缺陷的X射线像质计评价法  

Evaluation method with radiographic image quality indicator for internal defects of dental casting metallic restoration

作　　者：李媛[1] 郑刚[1] 林红[1] 

机构地区：[1]北京大学口腔医学院·口腔医院口腔材料研究室口腔数字化医疗技术和材料国家工程实验室,北京100081

出　　处：《北京大学学报（医学版）》2014年第6期963-968,共6页Journal of Peking University:Health Sciences

摘　　要：目的:为了在患者安装修复体前,有效检测出修复体内部存在的缺陷,本研究设计了一种新型的牙科专用像质计。方法:应用X射线像质计评价法,对127例金属铸造修复体咬合面的近似厚度和修复体的内部质量进行评价,并与测量咬合面厚度的传统卡规法比较测量值的准确性。结果:在127例金属铸造修复体中,金属铸造冠/桥共26个病例,其中9例咬合面厚度小于0.7 mm,最薄处厚度仅为0.2 mm;牙科专用像质计测得值与传统卡规测得值基本一致。56个金属烤瓷铸造冠/桥中2例金属内冠厚度小于0.3 mm。45个铸造支架可摘局部义齿的金属铸造基托厚度均大于1.0 mm,未发现过薄现象。发现1例纯钛可摘局部义齿的卡环影像不均匀,内部存在气孔缺陷。结论:使用牙科专用像质计评价金属铸造修复体的X射线底片时,可以避免因成像背景不同而产生的视觉误差,因此可以在发现修复体咬合面缺陷的同时,通过比较推算咬合面缺陷处厚度。Objective：To develop a new kind of dental radiographic image quality indicator （IQI） for internal quality of casting metallic restoration to influence on its usage life.Methods：Radiographic image quality indicator method was used to evaluate the depth of the defects region and internal quality of 127 casting metallic restoration and the accuracy was compared with that of conventional callipers method.Results：In the 127 cases of casting metallic restoration,9 were found the thickness less than 0.7mm and the thinnest thickness only 0.2 mm in 26 casting metallic crowns or bridges＇ occlusal defects region.The data measured by image quality indicator were consistent with those measured by conventional gauging.Two metal inner crowns were found the thickness less than 0.3 mm in 56 porcelain crowns or bridges.The thickness of casting removable partial denture was more than 1.0 mm,but thinner regions were not found.It was found that in a titanium partial denture,the X-ray image of clasp was not uniform and there were internal porosity defects in the clasp.Conclusion：Special dental image quality indicator can solve the visual error problems caused by different observing backgrounds and estimate the depth of the defects region in the casting.

关 键 词：牙修复体 牙科铸造技术 放射摄影术 牙科 数字 像质计 

分 类 号：R783.1[医药卫生—口腔医学]