牙科金属铸造修复体内部缺陷的X射线像质计评价法

发布时间：2018-02-27 13:08

本文关键词： 牙修复体牙科铸造技术放射摄影术牙科数字像质计　出处：《北京大学学报(医学版)》2014年06期 　论文类型：期刊论文

【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。
[Abstract]:Objective: in order to detect the defects in the prosthesis before the prosthesis was installed, a new type of dental image quality meter was designed. The approximate thickness of occlusal surface and the internal quality of the prosthesis in 127 cases of metal casting prosthesis were evaluated, and the accuracy of the measured value was compared with the traditional method of measuring the thickness of the occlusal surface. Results: in 127 cases of metal casting prosthesis, There were 26 cases of metal cast crown / bridge. The thickness of occlusal surface was less than 0.7 mm in 9 cases, and the thickness of the thinnest part was only 0.2 mm. The measured value of dental image quality was basically the same as that measured by traditional caliper. The thickness of inner crown in 2 cases of 56 metal fused porcelain crowns / bridges was less than 0. 3 mm.45. The thickness of metal casting base of removable partial denture was more than 1.0 mm, and no thin phenomenon was found. It was found that the clasp image of one case of pure titanium removable partial denture was not uniform. Conclusion: the visual error caused by different imaging background can be avoided when the dental image quality meter is used to evaluate the X-ray negative of the metal casting prosthesis, so the defects of the prosthesis bite surface can be found at the same time. The thickness of defects in the occlusal surface was calculated by comparison.
【作者单位】：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;
【分类号】：R783.1

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