MARGINAL ADAPTATION AND INTERNAL FIT OF ADVANCED LITHIUM DISILICATE (TESSERA) VERSUS LITHIUM DISILICATE (IPS-EMAX CAD) IMPLANT-SUPPORTED HYBRID ABUTMENT CROWNS (AN INVITRO STUDY)

Document Type : Original Article

Authors

1 Master’s Candidate, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University.

2 Professor of Fixed Prosthodontics, Faculty of Dentistry, Cairo University

3 Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Cairo University

Abstract

Aim: This study aimed to assess the marginal gap and internal fit of implant-supported hybrid abutment crowns (HACs) fabricated from advanced lithium disilicate (CEREC Tessera) and lithium disilicate (IPS e.max CAD).
Materials and Methods: A total of twenty-four HACs were fabricated using a digital workflow from CEREC Tessera and IPS e.max CAD (n=12 per group). Marginal adaptation was evaluated using a stereomicroscope, while internal fit was assessed using the replica technique. The collected data (mean and standard deviation) were statistically analyzed.
Results: A statistically significant difference was observed between the two groups in terms of marginal adaptation (P=0.001), with CEREC Tessera exhibiting a lower marginal gap. However, no statistically significant difference was found between the two tested groups concerning internal fit (P=0.056).
Conclusion: Both CEREC Tessera and IPS e.max CAD hybrid abutment crowns demonstrated clinically acceptable marginal adaptation and internal fit within the established clinical values. These findings support their compatibility for implant-supported restorations.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2025
Pages 2343-2353

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