The presence of Li_(2)Si_(2)O_(5) and LiAlSi_(4)O_(10) could effectively improve the elastic modulus and transmittance of lithium disilicate(LD)glass-ceramics.Through synergistically modulation of the crystal content ...The presence of Li_(2)Si_(2)O_(5) and LiAlSi_(4)O_(10) could effectively improve the elastic modulus and transmittance of lithium disilicate(LD)glass-ceramics.Through synergistically modulation of the crystal content and grain size,we obtained high strength and high transmittance of LD glass-ceramics.The optimal sample had a high transmittance of 90.3%,the hardness was 7.72 GPa,the fracture toughness was 1.07 MPa·m^(1/2),and the elastic modulus was 103.1 GPa.展开更多
Li_(2)O-Al_(2)O_(3)-SiO_(2)(LAS)glass-ceramics were prepared by a melting method.Effects of different Al_(2)O_(3)content on the structure,crystallization,transmittance and fracture toughness of LAS glassceramics were ...Li_(2)O-Al_(2)O_(3)-SiO_(2)(LAS)glass-ceramics were prepared by a melting method.Effects of different Al_(2)O_(3)content on the structure,crystallization,transmittance and fracture toughness of LAS glassceramics were investigated by means of XRD,FESEM and other methods as well.The results showed that the glass transition temperature and crystallization temperature of samples increased as the content of Al_(2)O_(3)increased from 4.1 wt%to 13.1 wt%,which restrained the precipitation of lithium disilicate crystals.The main crystalline phase of glass-ceramics transformed from lithium disilicate and petalite to silicon dioxide,which reduced the fracture toughness of glass-ceramics.When the Al_(2)O_(3)content was 7.1 wt%,the specimen had outstanding transmittance and fracture toughness.The transmittance was 90.32%.The fracture toughness was 1.13 MPa•m^(1/2).Compared with high-alumina glass,the fracture toughness of the glass-ceramic was greatly improved,and it could be used as a new type of protective material for mobile devices.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Funded by the National Natural Science Foundation of China(No.52372014)the Key R&D Project of Hubei Province(No.2022BAA025)the Key R&D Project of Jincheng City(No.20220120)。
文摘The presence of Li_(2)Si_(2)O_(5) and LiAlSi_(4)O_(10) could effectively improve the elastic modulus and transmittance of lithium disilicate(LD)glass-ceramics.Through synergistically modulation of the crystal content and grain size,we obtained high strength and high transmittance of LD glass-ceramics.The optimal sample had a high transmittance of 90.3%,the hardness was 7.72 GPa,the fracture toughness was 1.07 MPa·m^(1/2),and the elastic modulus was 103.1 GPa.
基金State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology)(No.2011DA105356)。
文摘Li_(2)O-Al_(2)O_(3)-SiO_(2)(LAS)glass-ceramics were prepared by a melting method.Effects of different Al_(2)O_(3)content on the structure,crystallization,transmittance and fracture toughness of LAS glassceramics were investigated by means of XRD,FESEM and other methods as well.The results showed that the glass transition temperature and crystallization temperature of samples increased as the content of Al_(2)O_(3)increased from 4.1 wt%to 13.1 wt%,which restrained the precipitation of lithium disilicate crystals.The main crystalline phase of glass-ceramics transformed from lithium disilicate and petalite to silicon dioxide,which reduced the fracture toughness of glass-ceramics.When the Al_(2)O_(3)content was 7.1 wt%,the specimen had outstanding transmittance and fracture toughness.The transmittance was 90.32%.The fracture toughness was 1.13 MPa•m^(1/2).Compared with high-alumina glass,the fracture toughness of the glass-ceramic was greatly improved,and it could be used as a new type of protective material for mobile devices.
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。
