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
Dental materials have been continuously developing over a long period of time. Every effort has been made to develop the physical and mechanical properties of the materials to mimic the natural tooth substances. Howev...Dental materials have been continuously developing over a long period of time. Every effort has been made to develop the physical and mechanical properties of the materials to mimic the natural tooth substances. However, that has not yet been achieved, making it necessary to apply conservative dental treatments. Conservative treatments are procedures which minimize the amount of defective tooth structure removed while maximizing the remaining amount of intact tooth structure, and defining the margin of the restoration at the supragingival level. In a substantially destructed tooth, the direct restoration, which is the most conservative restoration, has the limitations on the retention or creation of the proper contour of the restoration. The indirectly partial coverage restoration has recently gained in popularity. This treatment preserves the tooth structure while allowing reconstruction of the destructed structure to enable correct and proper tooth functioning and also provides a satisfactory cosmetic appearance. The purpose of this paper is to review and compare the various conservative techniques of partial coverage restorations and the full coverage treatment with crowns.展开更多
目的:对比美塑树脂贴面与瓷贴面修复前牙间隙的效果。方法:回顾性分析笔者医院2018年2月-2018年12月收治的45例采用瓷贴面进行美容修复的前牙间隙患者的临床资料和2019年1月-2019年10月收治的45例采用美塑树脂贴面进行美容修复的前牙间...目的:对比美塑树脂贴面与瓷贴面修复前牙间隙的效果。方法:回顾性分析笔者医院2018年2月-2018年12月收治的45例采用瓷贴面进行美容修复的前牙间隙患者的临床资料和2019年1月-2019年10月收治的45例采用美塑树脂贴面进行美容修复的前牙间隙患者的临床资料,分别记为对照组和观察组。对比修复后即刻、修复后2年修复体美国公共健康协会(United states public health society,USPHS)的修正标准评分结果、修复成功率和修复体牙髓有活力率,修复前和修复两年后牙周出血指数,修复材料脱落、局部折断及变色染色发生率。结果:观察组修复后即刻、修复后2年的修复体颜色、形态、边缘着色、密合度和继发龋USPHS评价A级者占比、修复成功率和修复体牙髓有活力率均高于对照组(均P<0.05);两组修复后2年牙周出血指数均减少,观察组低于对照组(均P<0.05);观察组总不良事件发生率低于对照组(P<0.05)。结论:美塑树脂贴面与瓷贴面修复前牙间隙均有一定疗效,且均可达到患者满意,但前者的疗效更佳,对牙周出血指数的改善效果更理想,且不良事件发生率更低。展开更多
目的:探讨微创全瓷贴面配合数字化微笑设计(Digital smile design,DSD)技术修复前牙切缘切角缺损的美学效果。方法:选取2019年1月-2022年1月笔者医院接诊的78例前牙切缘切角缺损患者为研究对象,采用区组随机化法分为观察组(116颗患牙)...目的:探讨微创全瓷贴面配合数字化微笑设计(Digital smile design,DSD)技术修复前牙切缘切角缺损的美学效果。方法:选取2019年1月-2022年1月笔者医院接诊的78例前牙切缘切角缺损患者为研究对象,采用区组随机化法分为观察组(116颗患牙)和对照组(120颗患牙),每组39例。对照组采用微创全瓷贴面修复,观察组给予微创全瓷贴面联合DSD技术进行修复。比较两组患者治疗6个月后的满意度、美学效果[美国公共卫生署评估标准(United states public health service,USPHS)],对比治疗前后两组患者的红色美学指数、牙周健康指数[牙龈指数(Gingival index,GI)、牙菌斑指数(Plaque index,PLI)、龈沟出血指数(Sulcus bleeding index,SBI)]的变化。结果:治疗6个月后,两组美学效果各维度评级有显著差异,观察组治疗满意率、红色美学指数评分均显著高于对照组(P<0.05);治疗6个月后,两组GI、PLI、SBI均明显降低,且观察组显著低于对照组(P<0.05)。结论:微创全瓷贴面联合DSD技术修复前牙切缘切角缺损可有效改善牙齿美学效果,提高患者治疗满意度,适合临床推广。展开更多
A system of finished Componeer composite veneers is a unique and having no analogy in the world elaboration of the Swisscompany Coltene/Whaledent, an outcome of almost halfa century experience of the company working i...A system of finished Componeer composite veneers is a unique and having no analogy in the world elaboration of the Swisscompany Coltene/Whaledent, an outcome of almost halfa century experience of the company working in a field of composite materials.It combines the best features of direct and indirect restoration methods. The system is fulfilled of nanocomposite Synergy D6 that hashigh mechanical strength, convenience for workable consistency, color stability and a system of halftone shades, which facilitates colormatching. All this allows achieving excellent aesthetic results in minimal time. Application of an original standard scale givespossibility effectively assess optical properties of dental hard tissues and develop an implementation strategy of restoration before workstarted. Formation of Componeer form, polymerization and polishing at factory allow a practitioner fully utilize effect of＂fluorescence＂ inherent to the material. All this allows us to position the Componeer system as a serious alternative to non-directmethods of restoration with the possibility of both high aesthetic and cosmetic reconstruction reliability.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Dental materials have been continuously developing over a long period of time. Every effort has been made to develop the physical and mechanical properties of the materials to mimic the natural tooth substances. However, that has not yet been achieved, making it necessary to apply conservative dental treatments. Conservative treatments are procedures which minimize the amount of defective tooth structure removed while maximizing the remaining amount of intact tooth structure, and defining the margin of the restoration at the supragingival level. In a substantially destructed tooth, the direct restoration, which is the most conservative restoration, has the limitations on the retention or creation of the proper contour of the restoration. The indirectly partial coverage restoration has recently gained in popularity. This treatment preserves the tooth structure while allowing reconstruction of the destructed structure to enable correct and proper tooth functioning and also provides a satisfactory cosmetic appearance. The purpose of this paper is to review and compare the various conservative techniques of partial coverage restorations and the full coverage treatment with crowns.
文摘目的:对比美塑树脂贴面与瓷贴面修复前牙间隙的效果。方法:回顾性分析笔者医院2018年2月-2018年12月收治的45例采用瓷贴面进行美容修复的前牙间隙患者的临床资料和2019年1月-2019年10月收治的45例采用美塑树脂贴面进行美容修复的前牙间隙患者的临床资料,分别记为对照组和观察组。对比修复后即刻、修复后2年修复体美国公共健康协会(United states public health society,USPHS)的修正标准评分结果、修复成功率和修复体牙髓有活力率,修复前和修复两年后牙周出血指数,修复材料脱落、局部折断及变色染色发生率。结果:观察组修复后即刻、修复后2年的修复体颜色、形态、边缘着色、密合度和继发龋USPHS评价A级者占比、修复成功率和修复体牙髓有活力率均高于对照组(均P<0.05);两组修复后2年牙周出血指数均减少,观察组低于对照组(均P<0.05);观察组总不良事件发生率低于对照组(P<0.05)。结论:美塑树脂贴面与瓷贴面修复前牙间隙均有一定疗效,且均可达到患者满意,但前者的疗效更佳,对牙周出血指数的改善效果更理想,且不良事件发生率更低。
文摘目的:探讨微创全瓷贴面配合数字化微笑设计(Digital smile design,DSD)技术修复前牙切缘切角缺损的美学效果。方法:选取2019年1月-2022年1月笔者医院接诊的78例前牙切缘切角缺损患者为研究对象,采用区组随机化法分为观察组(116颗患牙)和对照组(120颗患牙),每组39例。对照组采用微创全瓷贴面修复,观察组给予微创全瓷贴面联合DSD技术进行修复。比较两组患者治疗6个月后的满意度、美学效果[美国公共卫生署评估标准(United states public health service,USPHS)],对比治疗前后两组患者的红色美学指数、牙周健康指数[牙龈指数(Gingival index,GI)、牙菌斑指数(Plaque index,PLI)、龈沟出血指数(Sulcus bleeding index,SBI)]的变化。结果:治疗6个月后,两组美学效果各维度评级有显著差异,观察组治疗满意率、红色美学指数评分均显著高于对照组(P<0.05);治疗6个月后,两组GI、PLI、SBI均明显降低,且观察组显著低于对照组(P<0.05)。结论:微创全瓷贴面联合DSD技术修复前牙切缘切角缺损可有效改善牙齿美学效果,提高患者治疗满意度,适合临床推广。
文摘A system of finished Componeer composite veneers is a unique and having no analogy in the world elaboration of the Swisscompany Coltene/Whaledent, an outcome of almost halfa century experience of the company working in a field of composite materials.It combines the best features of direct and indirect restoration methods. The system is fulfilled of nanocomposite Synergy D6 that hashigh mechanical strength, convenience for workable consistency, color stability and a system of halftone shades, which facilitates colormatching. All this allows achieving excellent aesthetic results in minimal time. Application of an original standard scale givespossibility effectively assess optical properties of dental hard tissues and develop an implementation strategy of restoration before workstarted. Formation of Componeer form, polymerization and polishing at factory allow a practitioner fully utilize effect of＂fluorescence＂ inherent to the material. All this allows us to position the Componeer system as a serious alternative to non-directmethods of restoration with the possibility of both high aesthetic and cosmetic reconstruction reliability.
