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Previous issue date: 2017-11-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq / The current applications of nanotechnology in dentistry include adhesive systems
and composite resins, but they are still quite limited in dental materials. Dental stone
is a widely used material, and the incorporation of silica nanoparticles is still
unexplored. The purpose of this study is to evaluate the behavior of the mechanical
properties of dental stones with the addition of silica nanoparticles at different
concentrations. A total of 180 samples were prepared, 90 for each dental stone
(Durone and Fuji Rock). For the control group (CG), no silica particles were added,
while test group 1 (TG1) had silica nanoparticles added to 1% by weight, and test
group 2 (TG2) had silica nanoparticles added to 5% by weight. The roughness,
diametral tensile strength (DTS) and compressive strength were measured 24 hours
after the start of spatulation. The mean roughness values for Durone were CG= 0,55,
TG1= 0,36 and TG2= 0,28 ?m and for Fuji Rock were CG= 0,47, TG1= 0,31 and
TG2= 0,35 ?m. The mean DTS values for Durone were CG= 6,03, TG1= 5,17 and
TG2= 5,02 MPa and for Fuji Rock were CG= 6,41, TG1= 5,23 and TG2= 4,56 MPa.
The mean compressive strength values for Durone were CG= 35,44, TG1= 32,70
and TG2= 32,44 MPa and for Fuji Rock were CG= 42,97, TG1= 31,22 and TG2=
29,86 MPa. Surface roughness was statistically lower for the Durone and Fuji Rock
stones (p< 0,001) when silica nanoparticles were added. For DTS and compressive
strength, the addition of silica nanoparticles did not lead to statistically better results
when compared to the control groups (p> 0,05). / A nanotecnologia na Odontologia est? presente nos sistemas adesivos e nas resinas
compostas, sendo sua aplica??o ainda bastante limitada nos materiais dent?rios. O
gesso odontol?gico ? um material amplamente utilizado e a incorpora??o de
nanopart?culas de s?lica ? desconhecida. O objetivo do estudo ? avaliar o
comportamento das propriedades mec?nicas dos gessos odontol?gicos a partir da
adi??o de nanopart?culas de s?lica em diferentes concentra??es. Foram
confeccionadas 180 amostras, sendo 90 para cada gesso (Durone e Fuji Rock). No
grupo controle (GC) n?o foram adicionadas part?culas, no grupo teste 1 (GT1) foram
adicionadas 1% em peso e o grupo teste 2 (GT2) recebeu 5% em peso de
nanopart?culas de s?lica. Os testes de rugosidade, tra??o diametral (DTS) e
compress?o foram realizados ap?s 24 horas do in?cio da espatula??o. Os valores
m?dios de rugosidade para o Durone foram de GC= 0,55, GT1= 0,36 e GT2= 0,28
?m e para o Fuji Rock foram de GC= 0,47, GT1= 0,31 e GT2= 0,35 ?m. Para DTS
foram de GC= 6,03, GT1= 5,17 e GT2= 5,02 MPa para o Durone e para o Fuji Rock
foram de GC= 6,41, GT1= 5,23 e GT2= 4,56 MPa. Para compress?o foram de GC=
35,44, GT1= 32,70 e GT2= 32,44 MPa para o Durone e para o Fuji Rock foram de
GC= 42,97, GT1= 31,22 e GT2= 29,86 MPa. Houve uma menor rugosidade
superficial estatisticamente para os gessos Durone e Fuji Rock (p< 0,001) quando
adicionadas nanopart?culas de s?lica. Para a DTS e compress?o n?o houve
estatisticamente resultados melhores quando adicionadas nanopart?culas de s?lica
em compara??o aos grupos controles (p> 0,05).
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/7904 |
| Date | 24 November 2017 |
| Creators | Cesero, Leonardo de |
| Contributors | Mota, Eduardo Gon?alves |
| 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, 600, -2070498469879244349, 2075167498588264571, -2555911436985713659 |
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