Background The lithium disilicate-based ceramic is a newly developed all-ceramic material, which is lithium disilicate-based and could be used for fabricating almost all kinds of restorations. The extent of light atte...Background The lithium disilicate-based ceramic is a newly developed all-ceramic material, which is lithium disilicate-based and could be used for fabricating almost all kinds of restorations. The extent of light attenuation by ceramic material was material-dependent. Ceramic materials with different crystal composition or crystalline content would exhibit distinct light-absorbing characteristics. The aim of this study was to analyze the influence of ceramic thickness and light-curing time on the polymerization of a dual-curing resin luting material with a lithium disilicate-based ceramic. Methods A lithium disilicate-based ceramic was used in this study. The light attenuation caused by ceramic with different thickness was determined using a spectral radiometer. The commercial dual-cured resin cement was light-cured directly or through ceramic discs with different thickness （1, 2 and 3 mm, respectively） for different times （10, 20, 30, 40, 50 and 60 seconds, respectively）. The polymerization efficiency of resin cement was expressed in terms as Vickers hardness （VHN） measured after 24 hours storage. Two-way analysis of variance （ANOVA） and Tukey＇s HSD tests were used to determine differences. Results Intensity of polymerizing light transmitted through ceramic discs was reduced from 584 mW/cm2 to about 216 mW/cm2, 80 mW/cm2 and 52 mW/cm2 at thicknesses of 1 mm, 2 mm and 3 mm, respectively. Resin cement specimens self-cured alone showed significantly lower hardness values. When resin cement was light-cured through ceramic discs with a thickness of 1 mm, 2 mm and 3 mm, no further increasing in hardness values was observed when light-curing time was more than 30 seconds, 40 seconds and 60 seconds, respectively. Conclusions Within the limitation of the present study, ceramic thickness and light-curing time had remarkable influence on the polymerization of dual-cured resin cement. When resin cement is light-cured beneath a lithium disilicate ceramic with different thickness, prolonging light-curing tim展开更多
目的:探讨超薄瓷贴面关闭上颌前牙散在间隙的临床效果。方法:选择2015年12月~2016年12月于河南大学赛思口腔医院修复科就诊需要关闭上颌前牙散在间隙患者52例,共计158颗前牙,采用二硅酸锂玻璃陶瓷制作超薄瓷贴面关闭间隙。修复体完成后...目的:探讨超薄瓷贴面关闭上颌前牙散在间隙的临床效果。方法:选择2015年12月~2016年12月于河南大学赛思口腔医院修复科就诊需要关闭上颌前牙散在间隙患者52例,共计158颗前牙,采用二硅酸锂玻璃陶瓷制作超薄瓷贴面关闭间隙。修复体完成后按照改良美国公共卫生署(United States Public Health Service,USPHS)标准对修复体从颜色匹配、完整性、边缘着色、边缘适合性、术后敏感、继发龋及牙龈反应7个方面进行评价。结果:修复体戴入1个月,所有指标均达A级;6个月复诊,6颗(3.8%)颜色匹配为B级,2颗(1.3%)边缘着色为B级,2颗(1.3%)牙龈反应为B级;12个月复诊,2颗(1.3%)修复体完整性为C级,1颗(0.6%)边缘着色为B级,1颗(0.6%)牙龈反应为B级;24个月复诊,1颗(0.6%)颜色匹配为C级,1颗(0.6%)修复体完整性为B级;36个月复诊,1颗(0.6%)修复体完整性为B级。结论:使用超薄瓷贴面关闭上颌前牙散在间隙,对牙体损伤小,美学效果佳,符合现在口腔修复微创理念。展开更多
基金This study was supported in part by a grant from the National Natural Science Foundation of China （No. 51002185）.
文摘Background The lithium disilicate-based ceramic is a newly developed all-ceramic material, which is lithium disilicate-based and could be used for fabricating almost all kinds of restorations. The extent of light attenuation by ceramic material was material-dependent. Ceramic materials with different crystal composition or crystalline content would exhibit distinct light-absorbing characteristics. The aim of this study was to analyze the influence of ceramic thickness and light-curing time on the polymerization of a dual-curing resin luting material with a lithium disilicate-based ceramic. Methods A lithium disilicate-based ceramic was used in this study. The light attenuation caused by ceramic with different thickness was determined using a spectral radiometer. The commercial dual-cured resin cement was light-cured directly or through ceramic discs with different thickness （1, 2 and 3 mm, respectively） for different times （10, 20, 30, 40, 50 and 60 seconds, respectively）. The polymerization efficiency of resin cement was expressed in terms as Vickers hardness （VHN） measured after 24 hours storage. Two-way analysis of variance （ANOVA） and Tukey＇s HSD tests were used to determine differences. Results Intensity of polymerizing light transmitted through ceramic discs was reduced from 584 mW/cm2 to about 216 mW/cm2, 80 mW/cm2 and 52 mW/cm2 at thicknesses of 1 mm, 2 mm and 3 mm, respectively. Resin cement specimens self-cured alone showed significantly lower hardness values. When resin cement was light-cured through ceramic discs with a thickness of 1 mm, 2 mm and 3 mm, no further increasing in hardness values was observed when light-curing time was more than 30 seconds, 40 seconds and 60 seconds, respectively. Conclusions Within the limitation of the present study, ceramic thickness and light-curing time had remarkable influence on the polymerization of dual-cured resin cement. When resin cement is light-cured beneath a lithium disilicate ceramic with different thickness, prolonging light-curing tim
文摘目的:探讨超薄瓷贴面关闭上颌前牙散在间隙的临床效果。方法:选择2015年12月~2016年12月于河南大学赛思口腔医院修复科就诊需要关闭上颌前牙散在间隙患者52例,共计158颗前牙,采用二硅酸锂玻璃陶瓷制作超薄瓷贴面关闭间隙。修复体完成后按照改良美国公共卫生署(United States Public Health Service,USPHS)标准对修复体从颜色匹配、完整性、边缘着色、边缘适合性、术后敏感、继发龋及牙龈反应7个方面进行评价。结果:修复体戴入1个月,所有指标均达A级;6个月复诊,6颗(3.8%)颜色匹配为B级,2颗(1.3%)边缘着色为B级,2颗(1.3%)牙龈反应为B级;12个月复诊,2颗(1.3%)修复体完整性为C级,1颗(0.6%)边缘着色为B级,1颗(0.6%)牙龈反应为B级;24个月复诊,1颗(0.6%)颜色匹配为C级,1颗(0.6%)修复体完整性为B级;36个月复诊,1颗(0.6%)修复体完整性为B级。结论:使用超薄瓷贴面关闭上颌前牙散在间隙,对牙体损伤小,美学效果佳,符合现在口腔修复微创理念。
