Since the last two decades, restorative dentistry has been witnessing an increased acceptance of the use of the well-known all-ceramic materials for the fabrication of single dental restorations, such as inlays, onlay...Since the last two decades, restorative dentistry has been witnessing an increased acceptance of the use of the well-known all-ceramic materials for the fabrication of single dental restorations, such as inlays, onlays, crowns, anterior and posterior fixed partial dentures (PFPDs). These restorations certainly offer the potential for better biocompatibility coupled with superior aesthetic qualities, especially when compared with the conventional prostheses made from porcelain that is fused with metal ceramic restorations. However, brittleness and extreme sensitivity of all-ceramic materials to micro-like defects or cracks that are inherently present, or may grow, in their microstructure during different laboratory fabrication steps, during necessary clinical adjustments, or from post-placement chewing activity, remain major shortcomings of these dental restorations. In fact, many researchers are of the opinion that the improved mechanical properties can significantly improve the lifetime of all-ceramic restorations and result in enhanced reliability. Therefore, efforts of researchers, as well as manufacturers, have been directed towards the improvement of the mechanical properties in order to overcome such limitations. This article reviews the characterization of the most important mechanical properties that can delineate the behavior of all-ceramic dental materials upon loading. These include fracture mechanics, the brittle nature of ceramics, the relationship between microstructural features and fracture behavior, sources of cracks and flaws that may initiate a fracture and the effect of different fabrication procedures and/or clinical adjustments on the mechanical behavior of dental ceramics are also reviewed and discussed.展开更多
目的探讨CEREC计算机辅助设计与制作(computer aided design and computer aided manufacturing,CAD/CAM)全瓷高嵌体微创修复根管治疗后的后牙牙体缺损的临床疗效。方法选择126例大面积缺损的后牙,经过完善的根管治疗后,采用CEREC CAD/...目的探讨CEREC计算机辅助设计与制作(computer aided design and computer aided manufacturing,CAD/CAM)全瓷高嵌体微创修复根管治疗后的后牙牙体缺损的临床疗效。方法选择126例大面积缺损的后牙,经过完善的根管治疗后,采用CEREC CAD/CAM全瓷高嵌体修复缺损牙冠,修复后即刻对患者进行满意度调查,术后即刻及1年后随访,均按照改良的美国公共卫生部(United States Public Health Service,USPHS)标准对修复体进行临床评价。结果患者满意度在91%以上。根据改良USPHS标准,术后即刻及1年后复查时修复体边缘适合性达到A级分别为92.1%和91.3%(c2=0.052,P=0.820),外形达A级前后两次均为97.6%,表面质地达到A级分别为95.2%和93.7%(c2=0.303,P=0.582),颜色匹配达到A级分别为80.2%和81.7%(c2=0.103,P=0.748)。仅出现1例瓷破裂。结论 CEREC CAD/CAM全瓷高嵌体修复后牙牙体缺损效果良好,远期效果有待观察。展开更多
目的观察全瓷嵌体修复治疗儿童第一恒磨牙重度缺损的临床效果。方法已行完善牙髓治疗的第一恒磨牙严重牙体缺损患者34例,年龄7～15岁,共40颗患牙,使用CEREC系统进行全瓷修复,制备8颗全瓷嵌体和32颗高嵌体,使用复合树脂水门汀粘固。修复...目的观察全瓷嵌体修复治疗儿童第一恒磨牙重度缺损的临床效果。方法已行完善牙髓治疗的第一恒磨牙严重牙体缺损患者34例,年龄7～15岁,共40颗患牙,使用CEREC系统进行全瓷修复,制备8颗全瓷嵌体和32颗高嵌体,使用复合树脂水门汀粘固。修复后即刻和24个月时对患者进行满意度调查,12个月和24个月使用改良美国公共卫生服务(United States Public Health Service,USPHS)标准评价临床疗效,评价项目包括继发龋、边缘适合性、外形、颜色匹配、破裂、解剖形态、邻接关系、牙龈健康状况。结果 40颗全瓷修复儿童第一恒磨牙,修复后24个月,修复体的继发龋、外形、破裂三项指标都100%达到A级,边缘适合性、颜色匹配、解剖形态、邻接关系和牙龈健康状况其他指标也85%以上达A级。24个月和12个月结果比较,各项指标差异均无统计学意义(P>0.05)。患者修复后即刻、修复后24个月的主观评价满意率均达94%以上。结论使用CEREC椅旁全瓷嵌体/高嵌体微创修复可以作为儿童恒磨牙严重牙体缺损的有效治疗方案,疗效确切,满意度高。展开更多
文摘Since the last two decades, restorative dentistry has been witnessing an increased acceptance of the use of the well-known all-ceramic materials for the fabrication of single dental restorations, such as inlays, onlays, crowns, anterior and posterior fixed partial dentures (PFPDs). These restorations certainly offer the potential for better biocompatibility coupled with superior aesthetic qualities, especially when compared with the conventional prostheses made from porcelain that is fused with metal ceramic restorations. However, brittleness and extreme sensitivity of all-ceramic materials to micro-like defects or cracks that are inherently present, or may grow, in their microstructure during different laboratory fabrication steps, during necessary clinical adjustments, or from post-placement chewing activity, remain major shortcomings of these dental restorations. In fact, many researchers are of the opinion that the improved mechanical properties can significantly improve the lifetime of all-ceramic restorations and result in enhanced reliability. Therefore, efforts of researchers, as well as manufacturers, have been directed towards the improvement of the mechanical properties in order to overcome such limitations. This article reviews the characterization of the most important mechanical properties that can delineate the behavior of all-ceramic dental materials upon loading. These include fracture mechanics, the brittle nature of ceramics, the relationship between microstructural features and fracture behavior, sources of cracks and flaws that may initiate a fracture and the effect of different fabrication procedures and/or clinical adjustments on the mechanical behavior of dental ceramics are also reviewed and discussed.
文摘目的探讨CEREC计算机辅助设计与制作(computer aided design and computer aided manufacturing,CAD/CAM)全瓷高嵌体微创修复根管治疗后的后牙牙体缺损的临床疗效。方法选择126例大面积缺损的后牙,经过完善的根管治疗后,采用CEREC CAD/CAM全瓷高嵌体修复缺损牙冠,修复后即刻对患者进行满意度调查,术后即刻及1年后随访,均按照改良的美国公共卫生部(United States Public Health Service,USPHS)标准对修复体进行临床评价。结果患者满意度在91%以上。根据改良USPHS标准,术后即刻及1年后复查时修复体边缘适合性达到A级分别为92.1%和91.3%(c2=0.052,P=0.820),外形达A级前后两次均为97.6%,表面质地达到A级分别为95.2%和93.7%(c2=0.303,P=0.582),颜色匹配达到A级分别为80.2%和81.7%(c2=0.103,P=0.748)。仅出现1例瓷破裂。结论 CEREC CAD/CAM全瓷高嵌体修复后牙牙体缺损效果良好,远期效果有待观察。
文摘目的观察全瓷嵌体修复治疗儿童第一恒磨牙重度缺损的临床效果。方法已行完善牙髓治疗的第一恒磨牙严重牙体缺损患者34例,年龄7～15岁,共40颗患牙,使用CEREC系统进行全瓷修复,制备8颗全瓷嵌体和32颗高嵌体,使用复合树脂水门汀粘固。修复后即刻和24个月时对患者进行满意度调查,12个月和24个月使用改良美国公共卫生服务(United States Public Health Service,USPHS)标准评价临床疗效,评价项目包括继发龋、边缘适合性、外形、颜色匹配、破裂、解剖形态、邻接关系、牙龈健康状况。结果 40颗全瓷修复儿童第一恒磨牙,修复后24个月,修复体的继发龋、外形、破裂三项指标都100%达到A级,边缘适合性、颜色匹配、解剖形态、邻接关系和牙龈健康状况其他指标也85%以上达A级。24个月和12个月结果比较,各项指标差异均无统计学意义(P>0.05)。患者修复后即刻、修复后24个月的主观评价满意率均达94%以上。结论使用CEREC椅旁全瓷嵌体/高嵌体微创修复可以作为儿童恒磨牙严重牙体缺损的有效治疗方案,疗效确切,满意度高。
