Marginal Adaptation and Microleakage comparison between two Zirconia Oxide systems with the same cement

Abstract

Goal: To compare the marginal fit and micro-leakage of Lava™ and Zirkon zahn® copings using the same cement as adhesive. Materials and Methods: Twenty extracted superior premolars were divided into two groups. Teeth in the first group were prepared to receive Lava™ copings, while teeth in the second group were prepared for Zirkon zahn® copings. Copings were prepared following each system´s standard procedure. Marginal fit was measured in micrometers in eight different regions, both before and after being bound with RelyX™ U100 cement. Once thermocycled, samples were soaked in 2% fuchsin dye solution and buccolingually sliced, microleakage was measured, both in the vestibular and palatal regions. Results: A statistically significant difference in marginal fit between the two zirconia systems was found. Lava™ registered the best adaptation values: 19.7µm before cementation and 15.0µm after, while Zirkon zahn® reported marginal fit values of 28.1µm (before) and 22.8µm (after cementation). In contrast, we found no significant difference in microleakage: Lava™ averaged 314.2µm and Zirkon zahn® 319.8µm. Conclusion: Lava™ registered better marginal fit values than Zirkon zahn®, but no significant difference in microleakage. Key Words: Marginal fit, microleakage, zirconia, CAD-CAM.