title: Improvement in Ti-porcelain bonding by SiO(2) modification of titanium surface through cast method.
abstract: This study aimed to improve Ti-porcelain bonding strength through SiO2 modifications. Wax patterns were coated with SiO2 mixed with tetraethoxy silane (group C), patterns without coating were used as controls and subdivided into sandblasting group (group S) and polishing group (group P). Castingsurfaces were analyzed with XRD, while Ti-ceramic interfaces were characterized using SEM/EDS. Metal-ceramic specimens were tested in three point bending, and characterizations were also analyzed with SEM/EDS of porcelain debonding surfaces. In group C, SiO2 and Ti5Si3 phases were observed; SEM micrograph showed that Ti-porcelain had a compacted interface, and EDS maps of the interface illustrated the diffusion of Si, Al, and Sn to Ti, and cohesive fracture within the bonding agent. The bond strength of group C was 39.04±5.0 MPa, which was 15% higher than that of group S and 32% higher than that of group P. SiO2 coating could improve Ti-porcelain bond strength.
authors.affiliation: Beijing Institute of Dental Research, Capital Medical University School of Stomatology, Beijing Stomatological Hospital, 4 Tian Tan Xi Li, Dongcheng District, Beijing 100050, P.R. China.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Wei
authors.forename: Zutai
authors.initials: Z
authors.lastname: Zhang
authors.forename: Ning
authors.initials: N
authors.lastname: Ding
authors.forename: Dongxiang
authors.initials: D
authors.lastname: Zheng
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Xu
authors.initials: X
authors.lastname: Liu
mesh_terms: D000535:Aluminum / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D001840:Dental Bonding; D003735:Dental Casting Technique; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D006358:Hot Temperature; D006801:Humans; D007283:Inlay Casting Wax / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D012821:Silanes / Q000737:chemistry; D012825:Silicon / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014001:Tin / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D020099:Coated Materials, Biocompatible; D003764:Dental Materials; D012821:Silanes; D003776:Dental Porcelain; C040733:tetraethoxysilane; D014001:Tin; D012822:Silicon Dioxide; D007283:Inlay Casting Wax; D000535:Aluminum; D014025:Titanium; D012825:Silicon