title: Comparison of two different veneer preparation designs in vital teeth.
abstract: OBJECTIVE
  To compare the clinical performance of two different veneer preparation designs (overlap and nonoverlap) on anterior veneer restorations in vital teeth in a retrospective clinical study.
  
  
  METHODS
  In this study, 292 anterior all-ceramic veneer restorations in vital teeth were clinically examined in 74 patients. The preparation designs were categorized by the amount of tooth reduction on the final casts, with 245 in the overlap and 47 nonoverlap group.
  
  
  RESULTS
  After a mean ± SD observation time of 124.25 ± 60.61 months, 20 failures occurred. All failures occurred in the overlap design. Restorations with nonoverlap preparation designs showed significantly fewer failures than restorations with overlap preparation design (P = .018, log-rank).
  
  
  CONCLUSIONS
  Based on the findings of this study, whenever feasible, a preparation design without incisal overlap is recommended, especially in vital teeth..
authors.affiliation: Clinical Department of Restorative and Prosthetic Dentistry, Innsbruck Medical University, Innsbruck, Austria. ulrike.beier@i-med.ac.at
authors.forename: Ulrike Stephanie
authors.initials: US
authors.lastname: Beier
authors.forename: Matilda
authors.initials: M
authors.lastname: Dhima
authors.forename: Sreenivas
authors.initials: S
authors.lastname: Koka
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Salinas
authors.forename: Herbert
authors.initials: H
authors.lastname: Dumfahrt
mesh_terms: D000328:Adult; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003801:Dental Veneers; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D012189:Retrospective Studies