title: [Comparative adaptation of crowns of selective laser melting and wax-lost-casting method].
abstract: OBJECTIVE
  To investigate the marginal adaptation of crowns fabricated by selective laser melting (SLM) and wax-lost-casting method, so as to provide an experimental basis for clinic.
  
  
  METHODS
  Co-Cr alloy full crown were fabricated by SLM and wax-lost-casting for 24 samples in each group. All crowns were cemented with zinc phosphate cement and cut along longitudinal axis by line cutting machine. The gap between crown tissue surface and die was measured by 6-point measuring method with scanning electron microscope (SEM). The marginal adaptation of crowns fabricated by SLM and wax-lost-casting were compared statistically.
  
  
  RESULTS
  The gap between SLM crowns were (36.51 ± 2.94), (49.36 ± 3.31), (56.48 ± 3.35), (42.20 ± 3.60) µm, and wax-lost-casting crowns were (68.86 ± 5.41), (58.86 ± 6.10), (70.62 ± 5.79), (69.90 ± 6.00) µm. There were significant difference between two groups (P < 0.05).
  
  
  CONCLUSIONS
  Co-Cr alloy full crown fabricated by wax-lost-casting method and SLM method provide acceptable marginal adaptation in clinic, and the marginal adaptation of SLM is better than that of wax-lost-casting method.
authors.affiliation: Department of Prosthodontics, Shanghai Stomatological Disease Center, Shanghai 200031, China.
authors.forename: Guo-qiang
authors.initials: GQ
authors.lastname: Li
authors.forename: Qing-yi
authors.initials: QY
authors.lastname: Shen
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Gao
authors.forename: Xue-ying
authors.initials: XY
authors.lastname: Wu
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Wen-an
authors.initials: WA
authors.lastname: Dai
mesh_terms: D002858:Chromium Alloys; D017076:Computer-Aided Design; D003442:Crowns; D003735:Dental Casting Technique; D018772:Dental Marginal Adaptation; D017267:Dental Prosthesis Design; D005615:Freezing; D007834:Lasers
chemical_list: D002858:Chromium Alloys