Dental Journals
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An up to 5-year clinical evaluation of posterior in-ceram CAD/CAM core crowns.
Bindl A, Mormann WH. - Int J Prosthodont. 2002 Sep-Oct;15(5):451-6.
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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.
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