Artículos de revistas
Avaliação de Diferentes Compósitos na Resistência à Fratura de Núcleos de Preenchimento
Fecha
2010-10-21Registro en:
Pesquisa Brasileira em Odontopediatria e Clinica Integrada, v. 10, n. 2, p. 177-181, 2010.
1519-0501
1983-4632
10.4034/1519.0501.2010.0102.0008
2-s2.0-77957969097
2-s2.0-77957969097.pdf
1843509097437262
6385564645445607
0000-0002-1287-4798
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
Objective: To evaluate and compare the fracture strength of different composite resins used for core buildup. Method: Thirty-six bovine teeth were decoronated at the cervical third to standardize the length of specimens at 20 mm. Under constant irrigation, the canals were prepared with #5 Largo drills corresponding to the size and diameter of #3 Reforpost fiberglass post. The posts were cemented with Enforce resin sealer, being 16 mm inside the root canal and 4 mm outside the root canal, and the material was light-activated for 30 seconds at each side. The specimens were divided into 3 groups (n=12), in which cores (4 mm diameter and 5 mm high) were prepared from a prefabricated standard with three types of composite resins: Group 1: Z100 (3M), Group 2: Z250 (3M) and Group 3: P60 (3M). The specimens were fixed in a cylindrical device with an adaptor at 45o inclination. This device was adapted to a universal testing machine (EMIC) to simulate the force until fracture of the specimen. Data were subjected to ANOVA (p<0.05). Results: The Z250 resin cores presented the highest mean fracture strength (45.453 kgf), while the mean fracture strengths in Group 1 and Group 3 were 38.014 and 39.506 kgf, respectively. P60 caused the largest number of root fractures. Conclusion: Considering the characteristics and properties of the tested resins, Z250 appears as the most indicated for core buildup.