![]() ![]() The structural reliability of this combination of materials is primarily controlled by the properties of the core, 1 1- Rekow D, Thompson VP. The classic crown consists of a bilayer restoration: a strong and stiff ceramic core veneered with aesthetic porcelain. Although distinct, damage modes revealed potential to cause bulk fracture in both glass ceramic and resin nanoceramic crowns.Ĭeramics Dental crowns Fatigue Computer-aided design Polymersįull crowns have been widely used to restore extensively damaged teeth. ![]() The results suggest that if debonding issues can be resolved, resin nanoceramic figures can be an alternative to posterior crowns. Chief damage modes were radial cracks for RNC and inner cone cracks for LD, presenting no statistical difference. Considering subsurface damage, 53.8% of RNC and 46.2% of LD crowns survived the fatigue test, presenting no statistical difference. There were no debonding, cohesive or catastrophic failures. Survival data was subjected to Fisher's exact test damage modes were subjected to Mann-Whitney test (p<0.05). Specimens presenting fractures or severe subsurface damage were considered as failures. ![]() Surviving specimens were embedded in epoxy resin, polished and subsurface damage was analyzed. ![]() Specimens and indenters were inspected every 500,000 cycles and suspended when presenting fractures or debonding. Twenty-six resin nanoceramic (RNC) and lithium disilicate glass ceramic (LD) 2 mm monolithic crowns (n=13) were cemented on composite resin replicas of a prepared tooth and subjected to cyclic load with lithium disilicate indenters for 2 million cycles. To evaluate the fatigue strength and damage modes of monolithic posterior resin nanoceramic and lithium disilicate glass ceramic crowns. Polymer-based composite materials have been proposed as an alternative for single unit restorations, due to their resilient and shock absorbing behavior, in contrast to the brittleness of ceramic materials that could result in failure by fracture. Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Prótese, Bauru, São Paulo, Brasil. Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Dentários, Bauru, São Paulo, Brasil. Corresponding address: Fernanda Ferruzzi Curso de Odontologia, Centro Universitário Ingá. ![]()
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