The article introduces a new method for three-dimensional reproduction of edentulous dental casts,and wax occlusion rims with jaw relation by using a commercial high-speed line laser scanner and reverse engineering so...The article introduces a new method for three-dimensional reproduction of edentulous dental casts,and wax occlusion rims with jaw relation by using a commercial high-speed line laser scanner and reverse engineering software and evaluates the method’s accuracy in vitro.The method comprises three main steps：（i）acquisition of the three-dimensional stereolithography data of maxillary and mandibular edentulous dental casts and wax occlusion rims;（ii）acquisition of the three-dimensional stereolithography data of jaw relations;and（iii）registration of these data with the reverse engineering software and completing reconstruction.To evaluate the accuracy of this method,dental casts and wax occlusion rims of 10 edentulous patients were used.The lengths of eight lines between common anatomic landmarks were measured directly on the casts and occlusion rims by using a vernier caliper and on the three-dimensional computerized images by using the software measurement tool.The direct data were considered as the true values.The paired-samples t-test was used for statistical analysis.The mean differences between the direct and the computerized measurements were mostly less than 0.04 mm and were not significant（P.0.05）.Statistical significance among 10 patients was assessed using one-way analysis of variance（P,0.05）.The result showed that the 10 patients were considered statistically no significant.Therefore,accurate three-dimensional reproduction of the edentulous dental casts,wax occlusion rims,and jaw relations was achieved.The proposed method enables the visualization of occlusion from different views and would help to meet the demand for the computer-aided design of removable complete dentures.展开更多
目的比较CEREC3D/inLab MC XL系统5种扫描方法构建数字化模型的精度,探寻最佳的扫描方法。方法用一个标准的种植基台作为扫描对象,分别用inEos顶端拍摄、旋转拍摄、顶端和旋转联合拍摄、inLab MC XL激光扫描、CEREC蓝光拍摄5种扫描方法...目的比较CEREC3D/inLab MC XL系统5种扫描方法构建数字化模型的精度,探寻最佳的扫描方法。方法用一个标准的种植基台作为扫描对象,分别用inEos顶端拍摄、旋转拍摄、顶端和旋转联合拍摄、inLab MC XL激光扫描、CEREC蓝光拍摄5种扫描方法构建数字化模型。测量种植基台及各数字化模型的上表面直径,颈缘直径及上表面至颈缘的距离,测量结果用SAS9.2进行统计学分析。结果肉眼观察5种扫描方法构建的数字化模型存在明显差异,inEos旋转拍摄构建的数字化模型细节反映最清楚,各线、角清晰;inEos顶端拍摄和CEREC蓝光拍摄构建的数字化模型轴面的细节不够清楚,倒凹部分被忽略,有一定的失真,边缘反映不够清楚。SNK-q检验显示采用inEos旋转拍摄和inLab MC XL激光扫描2种扫描方法构建的数字化模型与实测结果差异无统计学意义(P>0.05),其他3种扫描方法构建的数字化模型与实测结果差异均有统计学意义(P<0.05)。结论 CEREC3D/inLab MC XL系统的5种扫描方法中,inEos旋转拍摄和inLab MC XL激光扫描2种扫描方法可以构建较准确的数字化模型,inEos顶端拍摄、inEos顶端和旋转联合拍摄以及CEREC蓝光拍摄略差。展开更多
文摘目的评价计算机辅助设计与制造(computer aided design and computer aided manufacturing,CAD/CAM)新型纳米复合陶瓷Lava Ultimate髓超嵌体和长石质瓷Vita TriLuxe髓超嵌体修复根管治疗后牙体缺损的临床效果。方法选取2017年1—12月于南京市口腔医院牙体牙髓病科就诊的58例患者根管治疗后缺损磨牙60颗,随机均分为两组,其中观察组30颗,采用Lava Ultimate髓超嵌体修复;对照组30颗,采用Vita TriLuxe髓超嵌体修复。根据改良美国公共卫生署(United States Public Health Service,USPHS)标准,比较两组临床修复效果。结果 60颗修复体均效果良好,无修复体脱落,仅在对照组发现1例修复体折裂情况;观察组在边缘密合性、完整性、继发龋和牙龈炎症方面与对照组比较,差异无统计学意义(P> 0.05);但观察组的对颌牙磨耗情况轻于对照组,差异有统计学意义(P <0.05)。结论 Vita TriLuxe髓超嵌体和Lava Ultimate髓超嵌体皆可用于修复根管治疗后的牙体缺损,新型纳米复合陶瓷Lava Ultimate相较于长石质瓷Vita TriLuxe更能减少对颌牙的磨耗,值得临床推广应用。
基金the Twelfth Five-Year National Key Technologies Research and Development Program of China(grant no.2012BAI07B00)the National High Technology Research and Development Program(‘863’Program)of China(grant nos.2013AA040801 and 2013AA040802)+1 种基金the National Natural Science Foundation of China(grant no.81271181)the Scientific Research Innovation Foundation for Youth Doctors of Peking University School of Stomatology(2011)
文摘The article introduces a new method for three-dimensional reproduction of edentulous dental casts,and wax occlusion rims with jaw relation by using a commercial high-speed line laser scanner and reverse engineering software and evaluates the method’s accuracy in vitro.The method comprises three main steps：（i）acquisition of the three-dimensional stereolithography data of maxillary and mandibular edentulous dental casts and wax occlusion rims;（ii）acquisition of the three-dimensional stereolithography data of jaw relations;and（iii）registration of these data with the reverse engineering software and completing reconstruction.To evaluate the accuracy of this method,dental casts and wax occlusion rims of 10 edentulous patients were used.The lengths of eight lines between common anatomic landmarks were measured directly on the casts and occlusion rims by using a vernier caliper and on the three-dimensional computerized images by using the software measurement tool.The direct data were considered as the true values.The paired-samples t-test was used for statistical analysis.The mean differences between the direct and the computerized measurements were mostly less than 0.04 mm and were not significant（P.0.05）.Statistical significance among 10 patients was assessed using one-way analysis of variance（P,0.05）.The result showed that the 10 patients were considered statistically no significant.Therefore,accurate three-dimensional reproduction of the edentulous dental casts,wax occlusion rims,and jaw relations was achieved.The proposed method enables the visualization of occlusion from different views and would help to meet the demand for the computer-aided design of removable complete dentures.
文摘目的比较CEREC3D/inLab MC XL系统5种扫描方法构建数字化模型的精度,探寻最佳的扫描方法。方法用一个标准的种植基台作为扫描对象,分别用inEos顶端拍摄、旋转拍摄、顶端和旋转联合拍摄、inLab MC XL激光扫描、CEREC蓝光拍摄5种扫描方法构建数字化模型。测量种植基台及各数字化模型的上表面直径,颈缘直径及上表面至颈缘的距离,测量结果用SAS9.2进行统计学分析。结果肉眼观察5种扫描方法构建的数字化模型存在明显差异,inEos旋转拍摄构建的数字化模型细节反映最清楚,各线、角清晰;inEos顶端拍摄和CEREC蓝光拍摄构建的数字化模型轴面的细节不够清楚,倒凹部分被忽略,有一定的失真,边缘反映不够清楚。SNK-q检验显示采用inEos旋转拍摄和inLab MC XL激光扫描2种扫描方法构建的数字化模型与实测结果差异无统计学意义(P>0.05),其他3种扫描方法构建的数字化模型与实测结果差异均有统计学意义(P<0.05)。结论 CEREC3D/inLab MC XL系统的5种扫描方法中,inEos旋转拍摄和inLab MC XL激光扫描2种扫描方法可以构建较准确的数字化模型,inEos顶端拍摄、inEos顶端和旋转联合拍摄以及CEREC蓝光拍摄略差。
