title: [Interface bond and compatibility between GI-II glass/alumina composite and Vitadur alpha veneering porcelain].
abstract: OBJECTIVE
  Multiple layer techniques were commonly employed in fabricating all-ceramic restorations. Bond and compatibility between layers were vitally important for the clinical success of the restorations. The purposes of this study were to investigate the bond of the interface between the GI-II glass/alumina composite and Vitadur alpha veneering porcelain, and to study the thermal compatibility between them.
  
  
  METHODS
  Prepared a bar shaped specimen of GI-II glass/alumina composite 25 mm x 5 mm x 1 mm in size, with bottom surface pre-notched. The upper surface was veneered with Vitadur alpha veneering porcelain (0.2 mm opaque dentin and 0.6 mm dentin porcelain), then fractured and the fracture surface were examined under scanning electron microscope (SEM) and electron microprobe analyzer (EMPA) with electron beam of 10 micrometer in diameter; ten all-ceramic single crowns for an upper right central incisor were fabricated and the temperatures of thermal shock resistance were tested.
  
  
  RESULTS
  SEM observation showed tight bond between the composite and the porcelain; The results of EMPA showed that penetration of Na, Al elements from glass/alumina into veneering porcelain and Si, K, Ca elements from veneering porcelain into glass/alumina occurred after sintering baking; The temperature of thermal shock resistance for anterior crowns in this study was 158 +/- 10.3 degrees C, cracks were mainly distributed in veneering porcelain with thicker layer.
  
  
  CONCLUSIONS
  Chemical bond exists between the GI-II glass/alumina composite and Vitadur alpha veneering porcelain, and there is good thermal compatibility between them.
authors.affiliation: Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Yukun
authors.initials: Y
authors.lastname: Meng
authors.forename: Yonglie
authors.initials: Y
authors.lastname: Chao
authors.forename: Yunmao
authors.initials: Y
authors.lastname: Liao
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D006801:Humans; D008855:Microscopy, Electron, Scanning
chemical_list: D003776:Dental Porcelain; D000537:Aluminum Oxide