Abstract
Objective: To evaluate the wear behavior of human enamel and chipping of veneered and monolithic zirconia for posterior full coverage restorations. Material and methods: Thirty-four zirconia full coverage restorations (seventeen in each group) were fabricated. The patients were divided into two groups according to the type of zirconia used; group 1 (comparator group) veneered zirconia crowns and group 2 (intervention group) monolithic zirconia single crowns. All crowns were lab fabricated and polished. For opposing teeth wear measurements 3D non-contact profilometer was used where epoxy resin replicas were constructed for opposing arch immediately after crowns cementation, three, six and twelve months. Restoration chipping was measured using modified United States Public Health Services (USPHS) criteria. Results: All restorations were reported as alpha with no chipping. There was no statistically significant difference between (Group 1) and (Group 2) for wear test. Conclusion: Both monolithic and veneered restorations revealed satisfactory mechanical properties with no chipping after one year of clinical use. Wear of opposing enamel was clinically acceptable for both materials. Keywords Ceramics; Chipping; Monolithic zirconia; Veneered zirconia; Wear.
Highlights
M odern dentistry has evolved through many materials and techniques where ceramics had major impact on this development
There’s lack of sufficient clinical and laboratory evidence regarding the clinical behavior of this new material especially wear behavior as wear evaluation is a time-consuming and expensive procedures [23,24,25,26]. The purpose of this randomized controlled clinical trial was to evaluate chipping and wear of human enamel opposing to full coverage posterior restoration fabricated either from veneered or monolithic zirconia
The null hypothesis was that there would be no difference in the wear or chipping behavior of veneered zirconia compared to monolithic zirconia posterior ceramic crown restoration
Summary
To evaluate the wear behavior of human enamel and chipping of veneered and monolithic zirconia for posterior full coverage restorations. Material and methods: Thirty-four zirconia full coverage restorations (seventeen in each group) were fabricated. Conclusion: Both monolithic and veneered restorations revealed satisfactory mechanical properties with no chipping after one year of clinical use. Objetivo: Avaliar o comportamento ao desgaste do esmalte humano e lascamento de zircônia estratificada e monolítica para coroas totais posteriores. Material e métodos: Trinta e quatro coroas totais de zircônia (dezessete em cada grupo) foram fabricadas. Conclusão: Ambas as coroas monolíticas e estratificadas revelaram propriedades mecânicas satisfatórias sem lascamento após um ano de uso clínico. Ceramics; Chipping; Monolithic zirconia; Cerâmica; lascamento; Zircônia monolítica; Veneered zirconia; Wear
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