Optimized sintering and mechanical properties of Y-TZP ceramics for dental restorations by adding lithium disilicate glass ceramics  

作　　者：Ke LI Jiancun RAO Congqin NING 

机构地区：[1]State Key Laboratory of High Performance Ceramics and Superfine Micro structure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]AIM Lab,Maryland NanoCenter,University of Maryland,College Park,MD 20742,USA [4]The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials,Shanghai Normal University,Shanghai 200234,China

出　　处：《Journal of Advanced Ceramics》2021年第6期1326-1337,共12页先进陶瓷（英文）

基　　金：supported by the Shanghai Committee of Science and Technology,China(No.17441904100).

摘　　要：The novel dental ceramics can be fabricated at lower temperatures when sol-gel derived lithium disilicate glass ceramics(LDGC)was used as an additive for yttria stabilized tetragonal zirconia polycrystalline(Y-TZP)ceramics.The effect of LDGC on the sintering,mechanical,and translucent properties of Y-TZP ceramics was investigated in the present study.The results showed that the LDGC additive effectively improved the densification of Y-TZP at 1100℃,which was much lower than the sintering temperature for pure Y-TZP.When sintered at 1100℃,the Y-TZP with 1 wt%LDGC reached a relative density of 95.45%,and prossessed a flexural strength of 482.4 MPa and a fracture toughness of 5.94 MPa-m12.Moreover,its translucency was also improved.While,the addition of LDGC could result in an escape of yttrium atoms from the grain lattice of zirconia,which induced the tetragonal-monoclinic transformation of zirconia and abnormal growth of monoclinic grains.The escaped yttrium atoms diffused into the intergranular glass phase.The results indicated that the novel Y-TZP-LDGC ceramics has a great potential to be used for all-ceramic restorations.

关 键 词：yttria stabilized tetragonal zirconia polycrystalline(Y-TZP) lithium disilicate glass ceramics(LDGC) SINTERING mechanical properties dental restoration 

分 类 号：R783.1[医药卫生—口腔医学] TQ174.1[医药卫生—临床医学]