Long-term clinical results of chairside Cerec CAD/CAM inlays and onlays: a case series

Int J Prosthodont. 2008 Jan-Feb;21(1):53-9.


Purpose: The objective of this follow-up study was to examine the performance of Cerec inlays and onlays, all of which were placed by the same clinician, in terms of clinical quality over a functional period of 15 years.

Materials and methods: Of 200 Cerec inlays and onlays placed consecutively in a private practice by one of the authors (TO) between 1989 and early 1991, 187 were closely monitored over a period of 15 years. All ceramic inlays and onlays had been placed chairside using the Cerec 1 method and had been luted with a bonding composite. Up to 17 years after their placement, a follow-up assessment was conducted, and the restorations were classified using modified United States Public Health Service criteria.

Results: According to Kaplan-Meier analysis, the success rate of Cerec inlays and onlays was 88.7% after 17 years. A total of 21 failures (11%) were found in 17 patients. Of these failures, 76% were attributed to ceramic fractures (62%) or tooth fractures (14%). The reasons for the remaining failures were caries (19%) and endodontic problems (5%). Restorations of premolars presented a lower failure risk than those of molars.

Conclusion: The survival rate probability of 88.7% after up to 17 years of clinical service for Cerec computer-aided design/computer-assisted machining restorations made of Vita Mk I feldspathic ceramic is regarded as a very respectable clinical outcome.

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aluminum Silicates / chemistry
  • Ceramics / chemistry*
  • Color
  • Composite Resins / chemistry
  • Computer-Aided Design*
  • Dental Bonding
  • Dental Marginal Adaptation
  • Dental Porcelain / chemistry*
  • Dental Prosthesis Design*
  • Dental Restoration Failure
  • Female
  • Follow-Up Studies
  • Humans
  • Inlays* / standards
  • Longitudinal Studies
  • Male
  • Middle Aged
  • Potassium Compounds / chemistry
  • Resin Cements / chemistry
  • Surface Properties
  • Survival Analysis
  • Treatment Outcome


  • Aluminum Silicates
  • Composite Resins
  • Potassium Compounds
  • Resin Cements
  • Dental Porcelain
  • feldspar
  • Cerec