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THE EFFECT OF PREPARATION DESIGN ON THE MARGINAL AND INTERNAL ADAPTATION OF MONOLITHIC TRANSLUCENT ZIRCONIA LAMINATE VENEERS FABRICATED WITH A DIGITAL WORKFLOW
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Abstract
Objective: To evaluate the effect of preparation design on the marginal and internal adaptation of monolithic translucent zirconia laminate veneers fabricated with a digital workflow. Materials and Methods: Two incisal preparation designs, window (W) and butt-joint (B), were prepared on the maxillary central incisors of a typodont. Twenty CAD/CAM-fabricated monolithic translucent zirconia laminate veneers (Z) were divided into two groups: 10 zirconia window (ZW) and 10 zirconia butt-joint (ZB). The silicone replica technique was applied to simulate the cement space, and the replicas were examined under a stereomicroscope. Data were analyzed using the independent t-test (for normally distributed data) and the Mann-Whitney U test (for non-normally distributed data). Results: For marginal adaptation, the mean overall and distal marginal gaps of the ZW group (51,1 ± 3,9 µm and 45,2 ± 5,0 µm) were significantly smaller than those of the ZB group (56,7 ± 6,6 µm and 53,7 ± 7,5 µm); no significant differences were found at the cervical, incisal, and mesial sites. For internal adaptation, the mean overall and incisal third gaps of the ZW group (108,5 ± 7,3 µm and 142,4 ± 18,4 µm) were significantly greater than those of the ZB group (97,5 ± 11,6 µm and 100,8 ± 14,0 µm), while the cervical third gap of the ZW group (81,0 µm) was significantly smaller than that of the ZB group (96,2 µm). No significant differences were found in the middle third. There were significant differences in the gap among the regions within the same group. Conclusions: All marginal and internal gap values were within the clinically acceptable range (<120 µm). The incisal preparation design influenced the adaptation of monolithic translucent zirconia laminate veneers. The window design showed better marginal adaptation, whereas the butt-joint design provided better internal adaptation. There were significant differences in the gap among the regions within the same group
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Keywords
monolithic translucent zirconia, marginal adaptation, internal adaptation, window design, butt-joint design.
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