SciELO - Scientific Electronic Library Online

 
vol.27 número1Orthodontic bonding to porcelain surfaces: in vitro shear bond strengthEvaluation of the lengths and angles of the tips of rotatory files in root canal preparations índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Revista Odonto Ciência

versión On-line ISSN 1980-6523

Resumen

PASQUALIN, Fábio Henrique et al. In vitro fracture resistance of glass-fiber and cast metal posts with different designs. Rev. odonto ciênc. [online]. 2012, vol.27, n.1, pp. 52-57. ISSN 1980-6523.  http://dx.doi.org/10.1590/S1980-65232012000100010.

PURPOSE: To evaluate the in vitro fracture resistance of roots with glass-fiber and metal dowels with different designs. METHODS: Fifty-endodontically treated maxillary central incisors were embedded in acrylic resin. Ten of them received only the coronary preparation, and the remaining forty were embedded (except for 4mm of the cervical area) after removing the clinical crowns. Specimens were divided into five groups (n=10): control (teeth with only coronary preparation), cylindrical cast dowel, conical cast dowel, cylindrical glass-fiber dowel and conical glass-fiber dowel. Specimens were subjected to an increasing compressive load (N) until fracture. RESULTS: ANOVA indicated significant difference (P<.05) among the groups, and the Tukey-Kramer´s test identified these differences. The control group (867±243 N) presented the highest values and was statistically similar to cylindrical glass-fiber dowel group (711±180 N). There is no significant difference among the metal dowel cylindrical (435±245 N) or conical (585±164 N) group and conical glass-fiber dowel (453±112 N). Cylindrical glass-fiber dowel (711±180 N) and conical cast dowel and core (585±164 N) groups had intermediate values and did not differ from each other. CONCLUSIONS: Cylindrical glass fiber dowels represent a viable alternative to the cast-metal dowel cylindrical or conical. Cylindrical glass fiber dowels also increase endodontically treated incisors' resistance to fracture.

Palabras llave : Fiber dowel; metallic dowel; dowel failure; resistance to fracture.

        · resumen en Portugués     · texto en Inglés     · pdf en Inglés