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Volume 34 , Issue 3
May/June 2021

Pages 324333

Evaluating the Marginal Integrity and Clinical Outcome of Posterior Zirconia Inlay-Retained Fixed Dental Prostheses: A Randomized Clinical Trial

Mohamed T. El Halawani, BDS, MSc/Yehia S. Aboushady, BDS, MSc, PhD/Sally M. Abdel Kader, BDS, MSc, PhD/Luca Solimei, DDS/Stefano Benedicenti, DDS

DOI: 10.11607/ijp.7081

Purpose: To assess the short-term outcomes of two different conservative preparation designs for posterior zirconia inlay-retained fixed dental prostheses (IRFDPs) and to analyze the marginal integrity of such restorations. Materials and Methods: Thirty patients with a missing maxillary first molar participated in this study and were divided randomly into two groups: one that received abutment preparations for inlay retainers (ID group, n = 20), including a proximal box and an occlusal extension, and one that received only proximal box preparations (PB group, n = 10). Zirconia IRFDPs were bonded in position and followed up after 2 weeks, 6 months, 1 year, and then annually. The in situ restorations were duplicated utilizing a single-step putty/ wash impression technique at the 2-week and 2-year follow-up visits. Restoration margins were evaluated under scanning electron microscopy, and marginal continuity was calculated as a percentage of the whole margin at the tooth-cement (TC) interface and the zirconia-cement (ZC) interface. Results: After a mean observation period of 26.2 months, all restorations were still in function. The only complication encountered was debonding of restorations; however, they were re-bonded back in place without issue. The cumulative Kaplan-Meier 2-year survival rate for the IRFDPs was 86.6%. There was a significant difference between the two groups regarding percentage of continuous margins (P < .05) after 2 years, with the percentage of continuous margins in the ID group at 92.8% and 91.5% at the TC and ZC interfaces, respectively, and in the PB group at 84.1% and 78.6%, respectively. Conclusion: Zirconia-based monolithic IRFDPs can be recommended for short-term replacement of a single maxillary molar.

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