An up to 5-year clinical evaluation of posterior in-ceram CAD/CAM core crowns

Int J Prosthodont. 2002 Sep-Oct;15(5):451-6.


Purpose: This study evaluated the clinical performance of posterior CAD/CAM-generated In-Ceram Alumina and In-Ceram Spinell core crowns.

Materials and methods: Nineteen In-Ceram Spinell core crowns (four premolars and 15 molars) and 24 In-Ceram Alumina core crowns (two premolars and 22 molars) in 21 patients were examined using modified USPHS criteria at baseline and after a mean service time of 39 +/- 11 months. The crown copings were machined from Vitablocs In-Ceram Alumina and Vitablocs In-Ceram Spinell using the Cerec 2 CAD/CAM system.

Results: Two molar In-Ceram Alumina core crowns fractured after respective service times of 14 and 17 months in the same patient. The Kaplan-Meier survival rate regarding fracture of the ceramic was 92% for In-Ceram Alumina and 100% for In-Ceram Spinell. At the follow-up examination, 80% alpha ratings and 18% beta ratings for In-Ceram Alumina core crowns and 84% alpha ratings and 15% beta ratings for In-Ceram Spinell core crowns were recorded.

Conclusion: Despite the two fractures, the clinical quality of CAD/CAM-generated In-Ceram Alumina and In-Ceram Spinell posterior crowns was excellent. Within the limitations of this study, both types of crowns appeared to be feasible.

Publication types

  • Comparative Study
  • Evaluation Study

MeSH terms

  • Adult
  • Aged
  • Aluminum Oxide
  • Bicuspid
  • Computer-Aided Design*
  • Crowns*
  • Dental Porcelain*
  • Dental Prosthesis Design*
  • Dental Restoration Failure
  • Female
  • Humans
  • Magnesium Oxide
  • Male
  • Middle Aged
  • Molar
  • Survival Analysis


  • spinell
  • Dental Porcelain
  • Magnesium Oxide
  • Aluminum Oxide