Precision of fit: The Procera AllCeram crown

Statement of problem. Strength, color stability, and precision of fit are requirements for all-ceramic restorations. The Procera AllCeram crown system, composed of a densely sintered high-purity alumina core combined with a low fusing surface porcelain, appears to satisfy most of these requirements. However, eval uation of marginal fit has not been reported. Purpose. This study measured the precision of fit of the Procera AllCeram crown fabricated with Procera CAD/CAM technology for the premolar and molar teeth fit to a die. Material and methods. Five ivorine maxillary first premolars and first molars were prepared for full-coverage crowns. Preparations were standardized with a convergence angle of 10 degrees, chamfer margins of 1.3 to 1.5 mm circumferentially, and occlusal reduction of 2.0 mm. AllCeram crowns were fabricated for the dies, and the fit of the crown to the die was determined by using a standardized procedure with a silicone impression material that served a dual role: (1) as a retrievable luting agent, and (2) to replicate the internal aspects of the crown. Laser videography was used to measure the gap dimension between the crowns and the dies at the marginal opening, the axial wall, the cusp tip, and the occlusal adaptation measurement locations. Mean gap dimensions and standard deviations (SDs) were calculated for marginal opening, internal adaptation, and precision of fit. Results. Mean gap dimensions and standard deviations at the marginal opening for the premolar and molar crowns were 56.0 mu m SD +/- 21 and 63.0 mu m SD +/- 13 mu m, respectively. The mean gap dimensions and SDs of the internal adaptation were 69.0 mu m SD +/- 17 mu m for axial wall, 48.0 mu m SD +/- 12 mu m for cusp tip, and 36.0 mu m SD +/- 7 mu m for occlusal adaptation for the premolar crowns; and 49.0 mu m SD +/- 3 mu m axial wall, 67.0 mu m SD +/- 21 mu m cusp tip, and 74.0 mu m SD +/- 29 mu m occlusal adaptation for molar crowns. Precision of fit and SDs for premolar and molar crowns were 52.0 mu m SD +/- 19 mu m and 63.0 mu m SD +/- 20 mu m, respectively. Mean marginal openings and precision of fit gap dimensions for the crown groups were not significantly different at the .05 level. However, gap dimensions that defined the internal adaptation at the measurement locations were different (P less than or equal to .05). Conclusion. Mean gap dimensions for marginal openings, internal adaptation, and precision of fit for the crown groups were below 70 mu m These findings show that the crowns studied can be prescribed with confidence knowing that the precision of fit will consistently be less than 70 mu m.