International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 14 , ISSUE 2 ( April-June, 2024 ) > List of Articles

ORIGINAL RESEARCH

Evaluation of Shear Bond Strength of CAD/CAM Ultra-translucent Zirconia and Lithium Disilicate Ceramics Bonded to Enamel: An In Vitro Study

Ibrahim A Elsisi, Omnia Nabil, Shereen A Amin

Keywords : Enamel substrate, Lithium disilicate, 10-methacryloyloxydecyl dihydrogen phosphate-based cement, Shear bond strength, 5-mol% yttria-stabilized tetragonal zirconia polycrystal

Citation Information : Elsisi IA, Nabil O, Amin SA. Evaluation of Shear Bond Strength of CAD/CAM Ultra-translucent Zirconia and Lithium Disilicate Ceramics Bonded to Enamel: An In Vitro Study. Int J Prosthodont Restor Dent 2024; 14 (2):86-93.

DOI: 10.5005/jp-journals-10019-1449

License: CC BY-NC 4.0

Published Online: 29-06-2024

Copyright Statement:  Copyright © 2024; The Author(s).


Abstract

Purpose: The purpose of this in vitro study was to compare the efficacy of bonding 5-mol% yttria-stabilized tetragonal zirconia polycrystal (5Y-PSZ) zirconia (Zr) to enamel relative to lithium (Li) disilicate glass-ceramic. Materials and methods: A total of 36 disk-shaped samples (4 × 2 mm2) were produced by milling process from two groups—Li disilicate (Li group) (IPS e.max CAD, n = 18) and 5Y-PSZ (Zr group) [KATANA Ultra-Translucent Multi-layered (UTML), (n = 18)]. All samples were subjected to a surface conditioning protocol for optimal bonding with a total-etch methacryloyloxydecyl dihydrogen phosphate (MDP) containing adhesive resin cement (Variolink Esthetic DC). Subsequently, a shear bond strength test was performed. The evaluation of failure modes and analysis of the surface was conducted using a light microscope. Failure modes were categorized into adhesive, cohesive, and mixed. The Mann–Whitney U test was utilized to assess statistically significant differences between the two groups. Qualitative data were presented as frequencies and percentages. The Chi-squared test was utilized for all comparative analyses. Results: There was no statistically significant difference in shear bond strength between the two groups (36.57 ± 30.81 MPa for the Li group and 34.11 ± 22.88 MPa for the Zr group). The failure modes varied between adhesive (40, 50%), mixed (30, 40%), and cohesive (30, 10%) in the Li and Zr groups, respectively, with insignificant differences between them (p = 0.53). Conclusion: A 5-mol% yttria-stabilized tetragonal Zr polycrystal showed high shear bond strength similar to Li disilicate glass-ceramic. Air blasting of Zr followed by primers and resin cements based on 10-MDP monomer has proven its efficiency in Zr-resin bonding. Both ultra-translucent 5Y-PSZ Zr and Li disilicate offer viable options for esthetic restorations on anterior teeth.


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