title: [Effects of laser welding on bond of porcelain fused cast pure titanium].
abstract: OBJECTIVE
  To investigate the influence of the laser welding on bond of porcelain fused to cast pure titanium.
  
  
  METHODS
  Twenty cast titanium plates were divided into two groups: laser welded group and control group. The low-fusing porcelain was fused to the laser welded cast pure titanium plates at fusion zone. The bond strength of the porcelain to laser welded cast pure titanium was measured by the three-point bending test. The interface of titanium and porcelain was investigated by scanning electron microscopy (SEM) and energy depressive X-ray detector (EDX). The non-welded titanium plates were used as comparison.
  
  
  RESULTS
  No significant difference of the bond strength was found between laser-welded samples [(46.85 +/- 0.76) MPa] and the controls [(41.71 +/- 0.55) MPa] (P > 0.05). The SEM displayed the interface presented similar irregularities with a predominance. The titanium diffused to low-fusing porcelain, while silicon and aluminum diffused to titanium basement.
  
  
  CONCLUSIONS
  Laser welding does not affect low-fusing porcelain fused to pure titanium.
authors.affiliation: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Juan-fang
authors.initials: JF
authors.lastname: Zhu
authors.forename: Hui-ming
authors.initials: HM
authors.lastname: He
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
authors.forename: Zhong-yi
authors.initials: ZY
authors.lastname: Wang
mesh_terms: D003735:Dental Casting Technique; D003776:Dental Porcelain; D012994:Dental Soldering / Q000379:methods*; D007834:Lasers; D008422:Materials Testing; D014025:Titanium
chemical_list: D003776:Dental Porcelain; D014025:Titanium