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Volume 16 , Issue 3
May/June 2003

Pages 244ľ248


Marginal and Internal Fit of Cerec 3 CAD/CAM All-Ceramic Crowns

Takashi Nakamura, DDS, PhD/Nobuyoshi Dei, DDS/Tetsuya Kojima, DDS, PhD/


PMID: 12854786

Purpose: The purpose of this study was to examine the effects of the occlusal convergence angle of the abutment and the computerĺs luting space setting on the marginal and internal fit of Cerec 3 computer-aided design/manufacturing (CAD/CAM) all-ceramic crowns. Materials and Methods: Mandibular second premolar all-ceramic crowns were fabricated for nine different conditions using Cerec 3: all combinations of abutments with three different total occlusal convergence angles (4, 8, and 12 degrees) with three different luting space settings (10, 30, and 50 Ám). The completed crowns were seated on the abutments, and the marginal gaps were measured. The internal gaps between the crowns and abutments were also measured, using test-fit silicone paste. Results: When the luting space was set to 10 Ám, the marginal gaps of the crowns were greater than when it was set to 30 or 50 Ám. When the luting space was set to 30 or 50 Ám, the marginal gaps ranged from 53 to 67 Ám and were not affected by the occlusal convergence angle of the abutment. The internal gaps were within a range of 116 to 162 Ám and tended to decrease as the occlusal convergence angle of the abutment decreased. Conclusion: When the luting space was set to 30 Ám, crowns with a good fit could be fabricated on the Cerec 3 system, regardless of the occlusal convergence angle of the abutment. Int J Prosthodont 2003;16:244ľ248.


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