Efeitos da dose de radiação X na resistencia de união de diferentes sistemas adesivoa a dentina / Effect of x-ray radiation dose on the bond strength of different adhesive systems to dentin

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This study investigated the influence of different x-ray radiation doses on the bond strength of adhesive restorations to dentin mediated by systems presenting distinct bonding strategies. Flat dentin surfaces in human molars were obtained and cylinder-shaped specimens for the microshear bond test were build-up with a composite (Z250, 3M ESPE), using three adhesive systems: a total-etch, two-step (Single Bond 2 - SB2, 3M ESPE), a self-etching, two-step (Clearfil SE Bond - CSE, Kuraray), or a self-etching, single step (Adper Prompt - ADP, 3M ESPE). The specimens were assigned to 4 groups (n = 10), according to the x-ray dose: 0 (control), 5, 35 or 70 Gy. Radiation was directed to the surface of the resin cylinders. Microshear testing was conducted after 24 h, and the failure modes classified under magnification (200x). Data were submitted to two-way ANOVA and Holm-Sidak s test (p<0.05). A non-linear regression analysis was carried out with bond strength as dependent variable. Bond strength results were dose- and material-dependent. SB2: control >5 = 35 >70; CSE: control = 5 >35 = 70; ADP: control = 5 = 35 = 70. Generally, SB2 >CSE >ADP. The non-linear regression plots showed that in general, an increase in radiation dose may predict a decrease in bond strength (R2 = 0.905). Failure modes were dependent on the bonding system, generally with no significant influence of radiation. X-ray radiation presented a significant, dose-dependent detrimental effect on the bond to dentin

ASSUNTO(S)

raio x x-ray

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