Fracture resistance and failure mode of monolithic zirconia, veneered zirconia, and metal-ceramic full-coverage restorations: A comparative in vitro study.
Saleh N Almohammed, Annalita M Dourado, Firas A Al Quran
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引用次数: 0
Abstract
Purpose: To evaluate and compare the fracture mode and strength of monolithic zirconia to veneered zirconia and metal-ceramic full-coverage restorations following artificial aging. The main concern was to test the performance of translucent zirconia in terms of load-bearing capacity.
Materials and methods: Two mandibular first molars were prepared and scanned for their respective groups of full-coverage restorations. 75 full-coverage restorations were fabricated and divided into five groups: two groups for monolithic zirconia, two groups for veneered zirconia, and one group for metal-ceramic. 75 light-cured hybrid composite resin dies were fabricated to serve as abutments. Before cementation, all full-coverage restorations were subjected to accelerated aging. After cementation, all full-coverage restorations were subjected to compressive loading until fracture in an electromechanical universal testing machine. A two-way nested analysis of variance and Tukey test were used to analyze the results with 95% confidence levels.
Results: Monolithic zirconia full-coverage restorations showed the highest mean fracture resistance of 4,201 N, followed by metal-ceramic full-coverage restorations of 3,609.3 N, and the veneered zirconia full-coverage restorations showed the lowest of 2,524.6 N. The main mode of failure was cohesive bulk fracture for the monolithic zirconia group, cohesive/adhesive failure along with infrastructure damage for the veneered zirconia group and cohesive/adhesive failure without infrastructure damage for the metal-ceramic group.
Conclusions: Monolithic zirconia full-coverage restorations showed superior resistance to fracture in comparison to metal-ceramic full-coverage restorations and are highly reliable in terms of load-bearing capacity within the posterior regions of the mouth.
期刊介绍：
Official Journal of the European Association for Osseointegration (EAO), the International College of Prosthodontists (ICP), the German Society of Prosthodontics and Dental Materials Science (DGPro), and the Italian Academy of Prosthetic Dentistry (AIOP)
Prosthodontics demands a clinical research emphasis on patient- and dentist-mediated concerns in the management of oral rehabilitation needs. It is about making and implementing the best clinical decisions to enhance patients'' quality of life via applied biologic architecture - a role that far exceeds that of traditional prosthetic dentistry, with its emphasis on materials and techniques. The International Journal of Prosthodontics is dedicated to exploring and developing this conceptual shift in the role of today''s prosthodontist, clinician, and educator alike. The editorial board is composed of a distinguished team of leading international scholars.
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