Marginal Design Evaluation for CAM Obtained Zirconia Based Crown Frameworks
Aim: The purpose of the study was to investigate the influence of two factors on the fit of zirconia-based frameworks: the teeth preparation design and the achieving technology. Materials and methods: Sixteen maxillary molar working dies were created from two master dies and divided into four groups. The master dies were fabricated with two different preparation designs: chamfer, and shoulder. Zirconia based crown frameworks were obtained through classical modeling/CAM, and CAD/CAM procedures. For both the Cercon system was used. Marginal and internal fit for all restorations were measured on the dies using cross-sections. Results: The mean gap size varied between 81.07 and 98.53 μm for the tested groups. There was no the significant difference in the fit of CAM obtained zirconia-based frameworks, irrespective of the studied technologies or preparation designs. Conclusion: Based on the results of this study, both marginal designs and achieving technologies are within acceptable ranges.
L. Sandu et al., "Marginal Design Evaluation for CAM Obtained Zirconia Based Crown Frameworks", Advanced Materials Research, Vol. 213, pp. 349-353, 2011