title: A 4- to 6-year retrospective clinical study of cracked teeth restored with bonded indirect resin composite onlays.
abstract: OBJECTIVE
  The purpose of this study was to retrospectively evaluate the clinical performance of bonded indirect resin composite onlays for the treatment of painful, cracked teeth over a 6-year period.
  
  
  METHODS
  Forty-three posterior teeth diagnosed as having a crack were selected in the restorative department of the University of Genoa. Inclusion criteria were sensitivity to biting and cold and a clinically visible crack. Direct composite buildup after removal of the existing restoration was performed before definitive cavity preparation. All composite onlay restorations were cemented with an adhesive technique using a 3-step total etch system and a dual-cure composite cement. Patients were interviewed and clinically examined at 1 week, 4 weeks, and every 6 months.
  
  
  RESULTS
  The effectiveness of bonded onlay restorations was evaluated for a mean observation time of 4.78 years. At 1 week, 38 (88.37%) restored teeth were free of pain, 3 (6.98%) still had sensitivity to cold, and 2 (4.65%) still had sensitivity to cold and chewing. At 4 weeks, 40 (93.02%) teeth were free of pain, 2 (4.65%) still had sensitivity to cold and chewing, and 1 (2.32%) needed endodontic treatment. Two other teeth (4.65%) also needed endodontic treatment, the first after 2 months and the second after 5 months. During the evaluation period, 3 restorations (6.98%) failed, and upon clinical examination, 40 (93.02%) teeth were free of symptoms with a 6-year survival rate of 93.02% (life table analysis).
  
  
  CONCLUSIONS
  Bonded indirect resin composite onlays can be successful in treating painful, cracked teeth. From the findings of this study, it appears that cuspal protection should be incorporated into the design of coronal restorations.
authors: Department of Biophysics, Medicine, and Dentistry, University of Genoa, Italy.
authors: Antonio
authors: A
authors: Signore
authors: Stefano
authors: S
authors: Benedicenti
authors: Ugo
authors: U
authors: Covani
authors: Giambattista
authors: G
authors: Ravera
mesh_terms: D000328:Adult; D000368:Aged; D001641:Bicuspid; D003188:Composite Resins; D003387:Cracked Tooth Syndrome / Q000628:therapy*; D001840:Dental Bonding / Q000379:methods; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D007284:Inlays / Q000379:methods; D053208:Kaplan-Meier Estimate; D015993:Life Tables; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D008963:Molar; D019279:Resin Cements; D019233:Retreatment; D012189:Retrospective Studies
chemical_list: D003188:Composite Resins; D019279:Resin Cements