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
BACKGROUND Atraumatic restorative treatment(ART)may be appropriate for populations without accessibility and affordability.More data are required regarding the success rate of ART in anterior teeth.AIM To evaluate the...BACKGROUND Atraumatic restorative treatment(ART)may be appropriate for populations without accessibility and affordability.More data are required regarding the success rate of ART in anterior teeth.AIM To evaluate the clinical performance of restoring class III cavities in anterior teeth of permanent dentition using the ART approach.METHODS A longitudinal interventional field study was carried out at two rural primary health centers,Tumkur district,India.A total of 54 teeth in 39 patients were evaluated for the survival rate of class III restorations in permanent anterior teeth using the ART approach in children and adult populations.Evaluation of ART restoration was carried out using Frencken J criteria,the mean procedure time,patient acceptance and reported pain severity during the ART approach were evaluated using a visual analog scale.Calculation of the cost of ART was also performed.RESULTS The mean time taken to perform the ART procedure was 14.79±5.8 min with the majority of patients reporting only mild pain.At 6 mo follow-up,72.2%remained in a good state,but this reduced to 27%at 12 mo.The cumulative survival rate of the restorations was 94.4%at 6 mo and 80.9%at 12 mo follow-up.Estimation of the direct cost for a single class III restoration was 186.50 INR(2.64 USD).CONCLUSION ART may be a good comprehensive option for basic oral health care for underserved or inaccessible populations,and preventive care for patients.展开更多
目的:测试自粘接树脂水门汀对修复用非贵金属和贵金属材料剪切粘接强度的影响。方法:用5种修复临床常用的金属材料(镍铬合金,钛合金,TypeⅢ金合金,金银钯合金,金属烤瓷金合金)铸造统一标准试件。将试件用6种自粘接树脂水门汀Maxcem(MA),...目的:测试自粘接树脂水门汀对修复用非贵金属和贵金属材料剪切粘接强度的影响。方法:用5种修复临床常用的金属材料(镍铬合金,钛合金,TypeⅢ金合金,金银钯合金,金属烤瓷金合金)铸造统一标准试件。将试件用6种自粘接树脂水门汀Maxcem(MA),Unicem(UN),Breeze(BR),Biscem(BI),Set(SE),Clearfil SA luting(CL)及1种传统树脂水门汀Resicem(RE)粘接。用万能材料试验机测试粘接强度。结果:各种金属的剪切粘接强度平均值为镍铬合金(9.9±7.8)MPa,钛合金(10.2±5.4)MPa,TypeⅢ金合金(2.6±1.9)MPa,金银钯合金(2.2±1.7)MPa,金属烤瓷金合金(5.0±2.3)MPa。BR、BI、CL在钛和镍铬合金组产生的剪切粘接强度高于其他水门汀(P<0.05),也高于其他3种金属材料组(P<0.05)。结论:自粘接树脂水门汀BR、BI、CL对非贵金属的粘接强度高于其他组别树脂水门汀。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.
基金Supported by the deanship of Scientific Research,King Saud University for funding through Vice Deanship of Scientific Research Chairs.
文摘BACKGROUND Atraumatic restorative treatment(ART)may be appropriate for populations without accessibility and affordability.More data are required regarding the success rate of ART in anterior teeth.AIM To evaluate the clinical performance of restoring class III cavities in anterior teeth of permanent dentition using the ART approach.METHODS A longitudinal interventional field study was carried out at two rural primary health centers,Tumkur district,India.A total of 54 teeth in 39 patients were evaluated for the survival rate of class III restorations in permanent anterior teeth using the ART approach in children and adult populations.Evaluation of ART restoration was carried out using Frencken J criteria,the mean procedure time,patient acceptance and reported pain severity during the ART approach were evaluated using a visual analog scale.Calculation of the cost of ART was also performed.RESULTS The mean time taken to perform the ART procedure was 14.79±5.8 min with the majority of patients reporting only mild pain.At 6 mo follow-up,72.2%remained in a good state,but this reduced to 27%at 12 mo.The cumulative survival rate of the restorations was 94.4%at 6 mo and 80.9%at 12 mo follow-up.Estimation of the direct cost for a single class III restoration was 186.50 INR(2.64 USD).CONCLUSION ART may be a good comprehensive option for basic oral health care for underserved or inaccessible populations,and preventive care for patients.
文摘目的:测试自粘接树脂水门汀对修复用非贵金属和贵金属材料剪切粘接强度的影响。方法:用5种修复临床常用的金属材料(镍铬合金,钛合金,TypeⅢ金合金,金银钯合金,金属烤瓷金合金)铸造统一标准试件。将试件用6种自粘接树脂水门汀Maxcem(MA),Unicem(UN),Breeze(BR),Biscem(BI),Set(SE),Clearfil SA luting(CL)及1种传统树脂水门汀Resicem(RE)粘接。用万能材料试验机测试粘接强度。结果:各种金属的剪切粘接强度平均值为镍铬合金(9.9±7.8)MPa,钛合金(10.2±5.4)MPa,TypeⅢ金合金(2.6±1.9)MPa,金银钯合金(2.2±1.7)MPa,金属烤瓷金合金(5.0±2.3)MPa。BR、BI、CL在钛和镍铬合金组产生的剪切粘接强度高于其他水门汀(P<0.05),也高于其他3种金属材料组(P<0.05)。结论:自粘接树脂水门汀BR、BI、CL对非贵金属的粘接强度高于其他组别树脂水门汀。
