title: Clinical longevity of ceramic laminate veneers bonded to teeth with and without existing composite restorations up to 40 months.
abstract: OBJECTIVE
  This study evaluated the survival rate of ceramic laminate veneers bonded to teeth with and without existing composite restorations (ECR).
  
  
  METHODS
  Twenty patients (mean age: 49.7 years) received 92 feldspathic ceramic laminate veneers (Shofu Vintage AL) on the maxillary teeth (intact teeth: n = 26; teeth with ECR: n = 66). Preparations with incisal overlap were made, and ECR of good quality were not removed but conditioned using silica coating (CoJet) and silanization (ESPE-Sil). Enamel and dentin were etched with 38% H3PO4 for 15-30 s and rinsed 30 s; adhesive resin (Excite) was applied, and laminate veneers were then cemented (Variolink Veneer). Restorations were evaluated at baseline and thereafter every 6 months using modified United States Public Health Service criteria.
  
  
  RESULTS
  Mean observation period was 21.6 months. Overall, five absolute failures were encountered (fractures: n = 3; chipping: n = 1; debonding: n = 1), resulting in a survival rate of 94.6% (Kaplan-Meier). Survival rates of the laminates bonded to teeth without (96%) and with ECR (93.5%) did not show significant differences (p > 0.05). Slight marginal defects (16 of 87 laminates) and slight marginal discoloration at the margins were noted (12 of 87 laminates) until the final recall. Secondary caries and endodontic complications were not detected in any of the teeth.
  
  
  CONCLUSIONS
  The clinical survival of ceramic laminate veneers up to 40 months was not significantly influenced when they were bonded onto intact teeth or onto teeth with ECR.
  
  
  CONCLUSIONS
  When no caries is present, it may not be necessary to replace existing composite restorations prior to cementation of ceramic laminate veneers.
authors: Department of Fixed and Removable Prosthodontics, Center for Dentistry and Oral Hygiene, University of Groningen, Antonius Deusinglaan 1, 9713, AV Groningen, The Netherlands. marcogresnigt@yahoo.com
authors: Marco M M
authors: MM
authors: Gresnigt
authors: Warner
authors: W
authors: Kalk
authors: Mutlu
authors: M
authors: Özcan
mesh_terms: D000328:Adult; D000368:Aged; D003188:Composite Resins; D001840:Dental Bonding; D003776:Dental Porcelain; D017268:Dental Prosthesis Retention; D003793:Dental Restoration, Permanent; D003801:Dental Veneers; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D011446:Prospective Studies; D013997:Time Factors; D019231:Tooth Preparation, Prosthodontic; D055815:Young Adult
chemical_list: D003188:Composite Resins; D003776:Dental Porcelain