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A Journal on Dentistry and Maxillofacial Surgery
Minerva Stomatologica 2010 November-December;59(11-12):645-51
e-Modulus of resin cements as a function of curing source and storage time
Dutra-Corrêa M. 1, Alves Cunha L. 2, De Araújo M. A. M. 2, Carneiro Valera M. 2 ✉
1 Department of Restorative Dentistry, Paulista University (UNIP), São Paulo, Brazil;
2 Department of Restorative Dentistry, São Paulo State University (UNESP), São José dos Campos, Brazil
AIM: The aim of this study was to evaluate the e-modulus of two resin cements, with different curing sources and storage times, by flexural strength.
METHODS: Ninety-six rectangular specimens were prepared from 2 dual-cured resin cements (Bistite II DC and Panavia F 2.0). A QTH light-curing unit (XL 3000) and a light-emitting diode (Optilight CL) were used for curing. The specimens were stored for 24 hours or 30 days. Testing consisted of three-point flexural strength, with 50 kg of load and crosshead speed of 0.5 mm/min. Data were analyzed with analysis of variance and Tukey test (5%).
RESULTS: When QTH light curing was used, Panavia had flexural strengths of 183.30 MPa at 24h and 112.30 at 30 days; whereas, Bistite had strengths of 160.20 MPA at 24h and 120.20 MPa at 30 days. However, when LED was used, the values were significantly lower for both cements. The main effects of cement type, storage time and curing unit type were statistically significant, as were the statistical interactions of cement/curing unit and time/curing unit.
CONCLUSION: The experimental effects of cement type, storage time and curing unit type profoundly affected e-modulus.