title: [Influence of La2O3 and Li2O on glass powder for infiltrating ZTA all-ceramic dental material formed by gel-casting].
abstract: OBJECTIVE
  The influence of La2O3 and Li2O on glass powder was studied in this paper, which is to infiltrate ZTA all-ceramic dental material formed by gel-casting. The performance of different component was analyzed to optimize glass formula.
  
  
  METHODS
  Six groups of glass powder were designed and prepared by conventional melt-quenching method. ZTA ceramic blocks were covered with glass paste, which were formed by gel-casting and sintered in 1200 degrees centigrade, then infiltrated in 1150 degrees centigrade for twice to make glass/ZTA ceramic composites. By detecting differential thermal analysis and melting range of infiltration glass power, as well as flexural strength, linear shrinkage, SEM and EDS of glass/ZTA ceramic composites, the optimized glass group was determined out. Statistical analysis was performed using SPSS 13.0 software package by means of paired t test or one way ANOVA.
  
  
  RESULTS
  The bending strength of group Li1 was (291.2±27.9) MPa, significantly higher than group Li2 and group La2(P<0.05), and linear shrinkage of group Li1 was only(1.85±0.27)%. SEM and EDS showed glass of group Li1 can lubricate ZTA ceramics well, their structure was compact and had a few small pores. Intergranular fracture existed on cross surface as well as transgranular fracture.
  
  
  CONCLUSIONS
  The results showed that Li1(30%La2O3-15%Al2O3-15%SiO2-15%B2O3-5%Li2O) glass infiltrated ZTA ceramic composite had the best capability. Glass/ZTA composite material can be prepared by gel-casting and infiltrating way, and this process is simple and economically suitable for general dental laboratory.
authors.affiliation: Department of Prosthetics, Wenzhou Medical College, Wenzhou, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Jin
authors.forename: Xiao-fei
authors.initials: XF
authors.lastname: Wang
authors.forename: Zheng-yu
authors.initials: ZY
authors.lastname: Yang
authors.forename: Yi-ping
authors.initials: YP
authors.lastname: Tong
authors.forename: Li
authors.initials: L
authors.lastname: Zhu
authors.forename: Jian-feng
authors.initials: JF
authors.lastname: Ma
mesh_terms: D000537:Aluminum Oxide; D002516:Ceramics; D003764:Dental Materials; D003776:Dental Porcelain; D005898:Glass; D012822:Silicon Dioxide
chemical_list: D003764:Dental Materials; D003776:Dental Porcelain; D012822:Silicon Dioxide; C023506:Glass ceramics; D000537:Aluminum Oxide