title: Effect of heat-pressing temperature and holding time on the microstructure and flexural strength of lithium disilicate glass-ceramics.
abstract: The present study aimed to evaluate the influence of various heat-pressing procedures (different holding time and heat pressing temperature) on the microstructure and flexural strength of lithium disilicate glass ceramic. An experimental lithium silicate glass ceramic (ELDC) was prepared from the SiO2-Li2O-K2O-Al2O3-ZrO2-P2O5 system and heat-pressed following different procedures by varying temperature and holding time. The flexural strength was tested and microstructure was analyzed. The relationships between the microstructure, mechanical properties and heat-pressing procedures were discussed in-depth. Results verified the feasibility of the application of dental heat-pressing technique in processing the experimental lithium disilicate glass ceramic. Different heat-pressing procedures showed significant influence on microstructure and flexural strength. ELDC heat-pressed at 950℃ with holding time of 15 min achieved an almost pore-free microstructure and the highest flexural strength, which was suitable for dental restorative application.
authors.affiliation: State Key Laboratory of Medical Stomatology, Department of Prosthodontics,  2; Department of Dental Technical Laboratory, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
authors.forename: Fu
authors.initials: F
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Medical Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Chai
authors.affiliation: State Key Laboratory of Medical Stomatology, Department of Dental Technical Laboratory, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
authors.forename: Zaixi
authors.initials: Z
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Medical Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Medical Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Medical Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
authors.forename: Jihua
authors.initials: J
authors.lastname: Chen
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: C493120:lithia disilicate; D003776:Dental Porcelain; C023506:Glass ceramics