目的研究冷热循环对CAD/CAM树脂陶瓷复合材料表面粗糙度及形貌的影响。方法以树脂陶瓷复合材料LU(Lava Ultimate),CE(Cerasmart),HY(Hyramic润瓷),VE(Vita Enamic)为实验组,以长石质玻璃陶瓷VM(Vita Mark Ⅱ)为对照组,分别在抛光即刻和...目的研究冷热循环对CAD/CAM树脂陶瓷复合材料表面粗糙度及形貌的影响。方法以树脂陶瓷复合材料LU(Lava Ultimate),CE(Cerasmart),HY(Hyramic润瓷),VE(Vita Enamic)为实验组,以长石质玻璃陶瓷VM(Vita Mark Ⅱ)为对照组,分别在抛光即刻和经10000次冷热循环后(冷热循环仪设置高温55℃,低温5℃,浸水时间为30s),测量表面粗糙度R_(a)并进行统计学分析,扫描电子显微镜(SEM)观测试件表面形貌。结果在抛光即刻,LU、CE、HY和VE组的R_(a)值在0.095~0.106μm之间,组间差异均无统计学意义(P>0.05)。VM组R_(a)值最小,为(0.054±0.014)μm,与其他4组相比差异具有统计学意义(P<0.05)。经冷热循环后,各组材料R_(a)值均增大,但与抛光即刻相比差异无统计学意义(P>0.05)。老化后,VM组R_(a)值仍小于其他4组,差异具有统计学意义(P<0.05)。SEM下表面形貌无明显变化。结论经冷热循环后,CAD/CAM树脂陶瓷复合材料和玻璃陶瓷表面微结构均较稳定。展开更多
A new type of polymer-infiltrated-ceramic-network composites (PICNs) was fabricated by infiltrating methacrylate-based monomers into partially sintered porous ceramics.The mechanical properties (flexural strength,flex...A new type of polymer-infiltrated-ceramic-network composites (PICNs) was fabricated by infiltrating methacrylate-based monomers into partially sintered porous ceramics.The mechanical properties (flexural strength,flexural modulus,elastic modulus,Vickers hardness,fracture toughness) were investigated and compared with that of the natural tooth and common commercial CAD/CAM blocks.Our results indicated that sintering temperature and corresponding density of porous ceramics have an obvious influence on the mechanical properties,and PICNs could highly mimic the natural tooth in mechanical properties.The biocompatibility experiments evaluated through in vitro cell attachment and proliferation of BMSCs showed good biocompatibility.The mechanical properties and biocompatibility confirmed that PICN could be a promising candidate for CAD/CAM blocks for dental restoration.展开更多
Layered porous ceramic used for polymer-infiltrated-ceramic-network materials(PICNs) may be a promising candidate for dental restoration.The effect of sintering temperature of ceramic green bodies on mechanical and op...Layered porous ceramic used for polymer-infiltrated-ceramic-network materials(PICNs) may be a promising candidate for dental restoration.The effect of sintering temperature of ceramic green bodies on mechanical and optical properties of PICNs is unclear.The purpose was to fabricate PICNs and evaluate their mechanical and optical properties.Polymer-infiltrated layered silicates for dental restorative materials were prepared via infiltrating polymerizable monomers into partially sintered porous silicates and thermo-curing.Bending samples for flexural strength and fracture toughness were fabricated(sample numbers of n=15).Vickers hardness and elastic modulus were measured via nano-indentation(n=10).One-way ANOVA and Weibull statistics were used for statistical analysis.Optical property was characterized by spectral reflectance.Brittleness index was used to characterize the machinability of the materials.Microstructures and phase structures were investigated using scanning electron microscopy(SEM) and X-ray diffractometer(XRD),respectively.Flexural strength of polymer-infiltrated layered silicates varied from 91.29 to 155.19 MPa,fracture toughness ranged from 1.186 to 1.782 MPa·m^1/2,Vickers hardness ranged from 1.165 to 9.596 GPa,and elastic modulus ranged from 25.35 to 100.50 GPa.The formed glass phases at 1200 and 1300℃ showed influences on corresponding optical property,which could be observed from spectral reflectance.A kind of PICNs was fabricated by infiltrating polymerizable monomers into layered porous ceramic networks.Sintering temperature could have dramatic effects on the mechanical and optical properties of porous ceramics and PICNs.These kinds of materials possess similar properties to that of natural tooth and could be used for dental restoration.展开更多
文摘目的研究冷热循环对CAD/CAM树脂陶瓷复合材料表面粗糙度及形貌的影响。方法以树脂陶瓷复合材料LU(Lava Ultimate),CE(Cerasmart),HY(Hyramic润瓷),VE(Vita Enamic)为实验组,以长石质玻璃陶瓷VM(Vita Mark Ⅱ)为对照组,分别在抛光即刻和经10000次冷热循环后(冷热循环仪设置高温55℃,低温5℃,浸水时间为30s),测量表面粗糙度R_(a)并进行统计学分析,扫描电子显微镜(SEM)观测试件表面形貌。结果在抛光即刻,LU、CE、HY和VE组的R_(a)值在0.095~0.106μm之间,组间差异均无统计学意义(P>0.05)。VM组R_(a)值最小,为(0.054±0.014)μm,与其他4组相比差异具有统计学意义(P<0.05)。经冷热循环后,各组材料R_(a)值均增大,但与抛光即刻相比差异无统计学意义(P>0.05)。老化后,VM组R_(a)值仍小于其他4组,差异具有统计学意义(P<0.05)。SEM下表面形貌无明显变化。结论经冷热循环后,CAD/CAM树脂陶瓷复合材料和玻璃陶瓷表面微结构均较稳定。
基金This work was financially supported by the National Natural Science Foundation of China
文摘A new type of polymer-infiltrated-ceramic-network composites (PICNs) was fabricated by infiltrating methacrylate-based monomers into partially sintered porous ceramics.The mechanical properties (flexural strength,flexural modulus,elastic modulus,Vickers hardness,fracture toughness) were investigated and compared with that of the natural tooth and common commercial CAD/CAM blocks.Our results indicated that sintering temperature and corresponding density of porous ceramics have an obvious influence on the mechanical properties,and PICNs could highly mimic the natural tooth in mechanical properties.The biocompatibility experiments evaluated through in vitro cell attachment and proliferation of BMSCs showed good biocompatibility.The mechanical properties and biocompatibility confirmed that PICN could be a promising candidate for CAD/CAM blocks for dental restoration.
基金financially supported by Beijing Municipal Science and Technology Commission(No.Z171100002017009)the National Natural Science Foundation of China(Nos.51532003,51221291,51328203 and 81671026)
文摘Layered porous ceramic used for polymer-infiltrated-ceramic-network materials(PICNs) may be a promising candidate for dental restoration.The effect of sintering temperature of ceramic green bodies on mechanical and optical properties of PICNs is unclear.The purpose was to fabricate PICNs and evaluate their mechanical and optical properties.Polymer-infiltrated layered silicates for dental restorative materials were prepared via infiltrating polymerizable monomers into partially sintered porous silicates and thermo-curing.Bending samples for flexural strength and fracture toughness were fabricated(sample numbers of n=15).Vickers hardness and elastic modulus were measured via nano-indentation(n=10).One-way ANOVA and Weibull statistics were used for statistical analysis.Optical property was characterized by spectral reflectance.Brittleness index was used to characterize the machinability of the materials.Microstructures and phase structures were investigated using scanning electron microscopy(SEM) and X-ray diffractometer(XRD),respectively.Flexural strength of polymer-infiltrated layered silicates varied from 91.29 to 155.19 MPa,fracture toughness ranged from 1.186 to 1.782 MPa·m^1/2,Vickers hardness ranged from 1.165 to 9.596 GPa,and elastic modulus ranged from 25.35 to 100.50 GPa.The formed glass phases at 1200 and 1300℃ showed influences on corresponding optical property,which could be observed from spectral reflectance.A kind of PICNs was fabricated by infiltrating polymerizable monomers into layered porous ceramic networks.Sintering temperature could have dramatic effects on the mechanical and optical properties of porous ceramics and PICNs.These kinds of materials possess similar properties to that of natural tooth and could be used for dental restoration.
