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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN:
Vol. 6, No. 21, 2007, pp. 1349-1352
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Bioline Code: os07019
Full paper language: English
Document type: Research Article
Document available free of charge
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Brazilian Journal of Oral Sciences, Vol. 6, No. 21, 2007, pp. 1349-1352
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Impact fracture strength applied todental modeling materials
Dias, Sérgio Candido; Moysés, Marcos Ribeiro; Agnelli, José Augusto M.; Ávila, Gisseli Bertozzi; Ribeiro, José Carlos Rabelo & Pereira, Luciano José
Abstract
The aim of the present study was to analyze the impact fracture
strength using plaster and resin modeling materials. The
analysis was made using nine dies having plaster III bases
and internal portion of laboratory-type addition silicone. Nine
test specimens were produced of each following material: type
IV Durone plaster, type IV Fuji Rock plaster, type IV Rock Plus
plaster, type V Durone plaster, Epoxiglass 1504 epoxy resin,
epoxy resin modified with diatomite and epoxy resin modified
with diatomite. The tests were performed in a Ceast testing
machine. At the moment of fracture, the machine recorded a
value (Energy), using a formula to obtain the impact strength
value in joules per meter. Statistical and variance analyses and
Student’s t test revealed that pure or silanized diatomite
increased the impact fracture strength of models made of
Epoxiglass 1504 epoxy resin and that silanizing the filler led to
a further gain in impact fracture strength. The models made of
Epoxiglass 1504 displayed greater impact fracture strength than
those made of plaster types IV and V. No statistically significant
differences were found among the analyzed plasters. Models
prepared with epoxy resin displayed in general greater impact
fracture strength than models made of plasters.
Keywords
resin, plaster, dental impression materials
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