title: Long-term survival of porcelain laminate veneers using two preparation designs: a retrospective study.
abstract: OBJECTIVE
  This study evaluated the long-term survival of anterior porcelain laminate veneers placed with and without incisal porcelain coverage.
  
  
  METHODS
  Two prosthodontists in a private dental practice placed 110 labial feldspathic porcelain veneers in 50 patients; 46 veneers were provided with incisal porcelain coverage, and 64 were not. The veneers were evaluated retrospectively from case records for up to 7 years (mean 4 years).
  
  
  RESULTS
  At 5, 6, and 7 years, the cumulative survival estimates were 95.8% for veneers with incisal porcelain coverage and 85.5% for those without incisal coverage. The difference was not statistically significant. Six of the nine failures occurred from porcelain fracture in the veneers without incisal coverage.
  
  
  CONCLUSIONS
  Although there was a trend for better long-term survival of the veneers with incisal porcelain coverage, this finding was not statistically significant.
authors.affiliation: Dental School, The University of Adelaide, South Australia. roger.smales@adelaide.edu.au
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Smales
authors.forename: Soheila
authors.initials: S
authors.lastname: Etemadi
mesh_terms: D000293:Adolescent; D000328:Adult; D016009:Chi-Square Distribution; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003801:Dental Veneers; D005260:Female; D006801:Humans; D015993:Life Tables; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D012189:Retrospective Studies
chemical_list: D003776:Dental Porcelain