title: [Comparison of the clinical effects of selective laser melting deposition basal crowns and cobalt chromium alloy base crowns].
abstract: OBJECTIVE
  To evaluate the clinical effects of selective laser melting (SLM) deposition basal crowns and cobalt chromium alloy casting base crowns.
  
  
  METHODS
  One hundred and sixty eight patients treated with either SLM deposition basal crowns (110 teeth) or cobalt chromium alloy casting basal crowns (110 teeth) were followed-up for 1 month, 6 months, 12 months and 24 months. The revised standard of American Public Health Association was used to evaluate the clinical effect of restoration, including the color of porcelain crowns, gingival inflammation, gingival margin discoloration, and crack or fracture. Data analysis was conducted with SPSS 20 software package for Student's t test and Chi-square test.
  
  
  RESULTS
  Six cases were lost to follow-up. The patients who were treated with SLM deposition basal crowns (104 teeth) and cobalt chromium alloy casting base crowns (101 teeth) completed the study. Patients were more satisfied with SLM deposition cobalt chromium alloy porcelain crowns. There was 1 prosthesis with poor marginal fit after 24 months of restoration in SLM crowns. There were 6 prostheses with edge coloring and 8 with poor marginal fit in cobalt chromium alloy casting base crowns, which was significantly different between the 2 groups(P<0.05).
  
  
  CONCLUSIONS
  The SLM deposition copings results in smaller edge coloring and better marginal fit than those of cobalt-chrome copings. Patients are pleased with short-term clinical results.
authors.affiliation: Department of Prosthodontics, Hangzhou Stomatological Hospital. Hangzhou 310014;China.E-mail:hzljm281@gmail.com.
authors.forename: Jing-min
authors.initials: JM
authors.lastname: Li
authors.forename: Wei-qian
authors.initials: WQ
authors.lastname: Wang
authors.forename: Jing-yuan
authors.initials: JY
authors.lastname: Ma
mesh_terms: D002858:Chromium Alloys; D003442:Crowns; D003776:Dental Porcelain; D006801:Humans; D007834:Lasers
chemical_list: D002858:Chromium Alloys; D003776:Dental Porcelain