title: Comparing government (school) vs. private (non-school) dental laboratories in marginal adaptation of single porcelain-fused-to-metal crowns.
abstract: OBJECTIVE
  The purpose of this study was to compare school and non-school dental laboratories in marginal adaptation of single Porcelain-Fused-to-Metal (PFM) crowns.
  
  
  METHODS
  Six dental laboratories (three school- and three non-school laboratories) participated in this study. Each dental laboratory was requested to fabricate PFM crowns for three different ivorine teeth on different typodont jaw models (n=18). The crowns received from the laboratories and fitted in their abutments using fit-checker under uniform pressure. We examined 162 sites viewed under a scanning electron microscope to measure the vertical and horizontal marginal discrepancy.
  
  
  RESULTS
  The mean vertical marginal discrepancy for school dental laboratories was 208.9 µm, while for non-school dental laboratories was 182.8 µm. For the horizontal marginal discrepancy, the median values were 48.5 µm for school dental laboratories and 50 µm for non-school dental laboratories.
  
  
  CONCLUSIONS
  There was no statistically significant difference in the mean vertical and median horizontal values between school and non-school dental laboratories. However, a significant difference was observed within the non-school laboratories.
authors.affiliation: King Saud University, College of Dentistry, PO Box 60169, Riyadh-11545, Saudi Arabia, Tel: +966 (0) 11 4677325, Fax: +966 (0) 11 4679015, e-mail: ialshiddi@ksu.edu.sa.
authors.forename: I F
authors.initials: IF
authors.lastname: Alshiddi
authors.forename: S R
authors.initials: SR
authors.lastname: Habib
authors.forename: F Y
authors.initials: FY
authors.lastname: Al-Mazrou
authors.forename: A M
authors.initials: AM
authors.lastname: Aly
authors.forename: A M
authors.initials: AM
authors.lastname: Al-Zaid