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Previous issue date: 2018-03-26 / Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Aims: 1) to evaluate the fracture resistance of posterior full-contour crowns of lithium dissilicate, lithium silicate reinforced by zirconia or translucent zirconia cemented on solid abutments; 2) to evaluate if the presence of a zirconia coping can increase the fracture resistance of lithium dissilicate crowns compared to monolithic ceramics made in lithium dissilicate, lithium silicate reinforced by zirconia or translucent zirconia. Materials and methods: Forty RN (regular-neck, Straumann) implant analogs and 4.0 mm solid abutments (Straumann) were embedded in acrylic resin and divided into 5 groups (n = 8): 1) e.max CAD; 2) Celtra Duo; 3) Incoris zirconia TZI; 4) 0.6 mm zirconia coping + e.max CAD; 5) 0.3 mm zirconia coping + e.max CAD. After preparation of the specimens, they were subjected to mechanical fatigue testing with 200N and 500,000 cycles. Following, the samples were submitted to the fracture resistance testing. Results: the means in Newtons (N) were as follows: e.max CAD 210.6Na ? 1447; Celtra Duo 2026Nb ? 355.8; zirconia TZI 2850Nc ? 287.6; 0.6 mm coping + e.max CAD 851Nd ? 108.1; 0.3 mm coping + e.max CAD 980Nd ? 133. Conclusion: monolithic translucent zirconia crowns cemented on solid abutments showed the higher fracture resistance in comparison to lithium dissilicate (e.max CAD) and lithium silicate reinforced by zirconia (Celtra Duo). The use of a zirconia coping associated with lithium dissilicate does not promote superior fracture resistance than monolithic crowns regardless of the thickness of coping and veneering ceramics. / Objetivos: 1) Avaliar a resist?ncia ? fratura de coroas cer?micas de dissilicato de l?tio, silicato de l?tio refor?ada por zirc?nia e zirc?nia transl?cida cimentadas sobre pilares s?lidos; 2) Avaliar se a presen?a de um coping em zirc?nia pode aumentar a resist?ncia ? fratura de coroas de dissilicato de l?tio quando comparadas ?s cer?micas monol?ticas confeccionadas em dissilicato de l?tio, zirc?nia transl?cida ou silicato de l?tio refor?ada por zirc?nia cimentadas sobre pilares s?lidos.
Materiais e m?todos: Quarenta an?logos de implantes RN (regular neck, Straumann) e pilares s?lidos 4.0mm (Straumann) foram inclu?dos em resina acr?lica e divididos em 5 grupos (n=8) os quais receberam as seguintes coroas prot?ticas cimentadas: 1) e.max CAD; 2) Celtra Duo; 3) zirc?nia Incoris TZI; 4) coping zirc?nia 0,6mm + e.max CAD; 5) coping zirc?nia 0,3mm + e.max CAD. Ap?s confec??o dos corpos de prova os mesmos foram submetidos ? fadiga mec?nica com carga de 200N e 500.000 ciclos. Na sequ?ncia foram submetidos ao ensaio de carga m?xima de carregamento.
Resultados: as m?dias de resist?ncia ? fratura obtidas foram: e.max CAD 1447Na ? 210,6; Celtra Duo 2026Nb ? 355,8; zirc?nia TZI 2850Nc ? 287,6; coping 0,6mm + e.max CAD 851Nd ? 108,1; coping 0,3mm + e.max CAD 980Nd ? 133.
Conclus?o: Coroas monol?ticas realizadas em zirc?nia transl?cida cimentadas sobre pilares s?lidos apresentaram a maior resist?ncia ? fratura quando comparadas ao dissilicato de l?tio (e.max CAD) e silicato de l?tio refor?ado por zirc?nia (Celtra Duo). O uso de um coping de zirc?nia associado ao dissilicato de l?tio n?o promove resist?ncia ? fratura superior as coroas monol?ticas independentemente das espessuras do coping e da cer?mica de cobertura.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/8223 |
| Date | 26 March 2018 |
| Creators | Stona, Deborah |
| Contributors | Burnett Jr., Luiz Henrique |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, Brasil, Escola de Ci?ncias da Sa?de |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 500, 600, -2070498469879244349, -2555911436985713659 |
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