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VOLUME 24 , ISSUE 8 ( August, 2023 ) > List of Articles

ORIGINAL RESEARCH

Effect of Cement Type on Fracture Resistance and Mode of Failure of Monolith vs Bilayered Zirconia Single Crowns

Mohammad Mostafa Rayyan, Hadeel Farouk

Keywords : Bilayered, Ceramic, Fracture resistance, Monolith, Zirconia

Citation Information : Rayyan MM, Farouk H. Effect of Cement Type on Fracture Resistance and Mode of Failure of Monolith vs Bilayered Zirconia Single Crowns. J Contemp Dent Pract 2023; 24 (8):576-581.

DOI: 10.5005/jp-journals-10024-3546

License: CC BY-NC 4.0

Published Online: 13-09-2023

Copyright Statement:  Copyright © 2023; The Author(s).


Abstract

Aim: To compare the fracture resistance and the mode of failure between monolith second-generation zirconia and bilayered first-generation zirconia single crowns cemented by resin cement and glass ionomer cement (GIC). Materials and methods: A total of 36 maxillary first premolar crowns (5 mm in length × 4 mm in cervical diameter, with a base of 6 mm) were computer-aided design–computer-aided manufacturing (CAD–CAM) milled. They were divided into the following two groups (n = 18) according to the fabrication techniques: Group M – monolith zirconia crown (1-mm axial thickness and 2-mm occlusal thickness) and group B – bilayer zirconia crown (0.5-mm axial thickness and 1-mm occlusal thickness). Each group was further subdivided into the following two subgroups (n = 9) according to the cement used: Subgroup G – cemented using GIC; subgroup R – cemented using resin cement. All crowns were cemented to their corresponding resin dies and stored in distilled water for 72 hours. Each specimen was mounted to the lower member of the universal testing machine with a load cell of 5 kN and a crosshead speed of 0.5 mm/minute. Failure modes were analyzed for fractured parts using scanning electron microscopy (SEM). Results: Subgroup MR recorded the highest fracture resistance mean value (3616 ± 347.2 N) while the BG subgroup recorded the statistically significant lowest fracture resistance mean value (1728.7 ± 115.3 N). One-way analysis of variance (ANOVA) followed by pairwise Tukey's post hoc tests revealed a statistically significant difference (p = 0.0001) between groups M and B. One-way ANOVA followed by pairwise Tukey's post hoc tests also showed a statistically significant difference (p = 0.0297) between the types of cement used (subgroups G and R). Conclusion: Monolith zirconia crowns had better mean fracture resistance than bilayered zirconia crowns. Resin cement improved the fracture resistance compared to GIC. Monolith zirconia crowns showed bulk fracture while bilayered zirconia crowns showed chipping fracture. Clinical significance: Monolith zirconia crowns present a good prosthetic alternative overcoming the veneer chipping drawback of bilayered zirconia crowns. In addition, resin cement could increase the fracture resistance of zirconia crowns.

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