IN VITRO COMPARISON OF RESISTANCE TO FRACTURE COMPRESSIVE LOAD AND STRENGTH OF TWO RESIN-TWO CEROMER PACKED WITH AND WITHOUT HEAT TREATMENT
DOI:
https://doi.org/10.15332/us.v10i1.1149Keywords:
Composite resins, Resistance to fracture, Hardness testsAbstract
Objective: To compare fracture resistance to compressive load and hardness of two ceromers and two packable composite resins with and without heat treatment.
Methods: One hundred and twenty specimens, distributed equally in six groups: ceromer Adoro-Ivoclar, Gradia-G.C, packable composite resin P60-3M light-curing, light-curing and under heat treatment, SureFil-Dentsply light-curing, light-curing and under heat treatment were evaluated. Compression tests were conducted in a universal test machine with load cell of 10 kN at 0,5 mm/min. Vickers hardness test were performed in a microdurometer with load of 50 gf during 15 seg. Univaried analysis was made to present average and standard deviation, and analysis bivaried with test ANOVA to cross variables.
Results: P60 with heat treatment offered the greatest resistance to the fracture (273.26 MPa) and Adoro (164.13 MPa) showed the lowest value. P60 without heat treatment presented the highest hardness (93.62 VHN) whereas the material that presented less hardness was Gradia (35.35 VHN).
Conclusion: P-60 resin has the greatest hardness and resistance to the fracture. The P-60 resin cured with light plus heat treatment is more resistant to the fracture than without heat treatment.
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