[Objectives]To explore the difference between the CAD/CAM customized zirconia abutment and the finished titanium abutment in the maxillary anterior region.[Methods]A total of 60 implants were selected from 60 patients...[Objectives]To explore the difference between the CAD/CAM customized zirconia abutment and the finished titanium abutment in the maxillary anterior region.[Methods]A total of 60 implants were selected from 60 patients who had undergone maxillary single anterior implant implantation in the Department of Oral and Maxillofacial Surgery,Affiliated Hospital of Qingdao University from July 2017 to July 2018.They were randomly divided into an observation group and a control group(30 patients/group).The observation group used CAD/CAM customized zirconia abutment and all-ceramic crown,while the control group used finished titanium abutment and all-ceramic crown.Twelve months after the crown restoration,mechanical complications,pink esthetic(another spelling of aesthetic)score(PES)and white esthetic score(WES),and patient satisfaction were used as clinical observation indicators to evaluate the restoration effect.[Results]For 12 months after crown restoration,the implant survival rate of the two groups of patients was 100%,and there was no abutment breakage,loosening,falling off,or screw loosening and breakage.The PES and WES of the observation group were significantly higher than those of the control group(P<0.05).The patient satisfaction of the observation group was significantly higher than those of the control group(P<0.05).[Conclusions]CAD/CAM customized zirconia abutment implant restoration in the maxillary anterior region can obtain good esthetic restoration effect in a short term,and has good clinical application effect.展开更多
Many small-size precise plastic helical involutes gears are used in electrical appliances to transmit rotary movements con- tinuously and smoothly. Ball-end milling is an effective method for trial manufacture or smal...Many small-size precise plastic helical involutes gears are used in electrical appliances to transmit rotary movements con- tinuously and smoothly. Ball-end milling is an effective method for trial manufacture or small batch production of this type of gear, but the precision of the gear is usually low. In this research, the main sources of the errors of the gear, machining errors of the tooth profile and trace of the gear obtained were analyzed. The correction amounts for these errors are then determined by using a CNC gear tester. They are used to generate a new 3D-CAD model for gear machining with better nrecision.展开更多
【目的】采用CAD/CAM标准测试模型评价四种不同临时冠粘结剂的粘结强度。【方法】参照因牙周病拔除的完整上颌中切牙CAD/CAM40副上颌中切牙的树脂测试模型(包括预备体和带固位孔的临时冠),分为4组(氧化锌组、玻璃离子体水门汀组、磷酸...【目的】采用CAD/CAM标准测试模型评价四种不同临时冠粘结剂的粘结强度。【方法】参照因牙周病拔除的完整上颌中切牙CAD/CAM40副上颌中切牙的树脂测试模型(包括预备体和带固位孔的临时冠),分为4组(氧化锌组、玻璃离子体水门汀组、磷酸锌水门汀组和Tempo Cem NE组),每组10副模型,每组分别采用4种不同的临时冠粘结剂进行粘结。采用MTS力学测试机对每一副模型以1mm/min的速度进行粘结强度测试,测出并记录每组每一副模型的粘结强度。【结果】4组的粘结强度分别为氧化锌组(37.48±4.92)N、玻璃离子体水门汀组(52.13±9.28)N、磷酸锌水门汀组(36.16±6.13)N、Tempo Cem NE组(46.21±6.70)N;玻璃离子体水门汀组和Tempo Cem NE组的粘结强度大于氧化锌组和磷酸锌水门汀组,差异具有统计学意义(P<0.05)。【结论】采用CAD/CAM上颌中切牙的标准测试模型进行4种临时冠粘结剂粘结强度的测试,实验结果认为玻璃离子体水门汀和Tempo Cem NE的粘结效果较好,值得临床广泛应用。展开更多
文摘[Objectives]To explore the difference between the CAD/CAM customized zirconia abutment and the finished titanium abutment in the maxillary anterior region.[Methods]A total of 60 implants were selected from 60 patients who had undergone maxillary single anterior implant implantation in the Department of Oral and Maxillofacial Surgery,Affiliated Hospital of Qingdao University from July 2017 to July 2018.They were randomly divided into an observation group and a control group(30 patients/group).The observation group used CAD/CAM customized zirconia abutment and all-ceramic crown,while the control group used finished titanium abutment and all-ceramic crown.Twelve months after the crown restoration,mechanical complications,pink esthetic(another spelling of aesthetic)score(PES)and white esthetic score(WES),and patient satisfaction were used as clinical observation indicators to evaluate the restoration effect.[Results]For 12 months after crown restoration,the implant survival rate of the two groups of patients was 100%,and there was no abutment breakage,loosening,falling off,or screw loosening and breakage.The PES and WES of the observation group were significantly higher than those of the control group(P<0.05).The patient satisfaction of the observation group was significantly higher than those of the control group(P<0.05).[Conclusions]CAD/CAM customized zirconia abutment implant restoration in the maxillary anterior region can obtain good esthetic restoration effect in a short term,and has good clinical application effect.
文摘Many small-size precise plastic helical involutes gears are used in electrical appliances to transmit rotary movements con- tinuously and smoothly. Ball-end milling is an effective method for trial manufacture or small batch production of this type of gear, but the precision of the gear is usually low. In this research, the main sources of the errors of the gear, machining errors of the tooth profile and trace of the gear obtained were analyzed. The correction amounts for these errors are then determined by using a CNC gear tester. They are used to generate a new 3D-CAD model for gear machining with better nrecision.
文摘【目的】采用CAD/CAM标准测试模型评价四种不同临时冠粘结剂的粘结强度。【方法】参照因牙周病拔除的完整上颌中切牙CAD/CAM40副上颌中切牙的树脂测试模型(包括预备体和带固位孔的临时冠),分为4组(氧化锌组、玻璃离子体水门汀组、磷酸锌水门汀组和Tempo Cem NE组),每组10副模型,每组分别采用4种不同的临时冠粘结剂进行粘结。采用MTS力学测试机对每一副模型以1mm/min的速度进行粘结强度测试,测出并记录每组每一副模型的粘结强度。【结果】4组的粘结强度分别为氧化锌组(37.48±4.92)N、玻璃离子体水门汀组(52.13±9.28)N、磷酸锌水门汀组(36.16±6.13)N、Tempo Cem NE组(46.21±6.70)N;玻璃离子体水门汀组和Tempo Cem NE组的粘结强度大于氧化锌组和磷酸锌水门汀组,差异具有统计学意义(P<0.05)。【结论】采用CAD/CAM上颌中切牙的标准测试模型进行4种临时冠粘结剂粘结强度的测试,实验结果认为玻璃离子体水门汀和Tempo Cem NE的粘结效果较好,值得临床广泛应用。
