The influence of temperature of three adhesive systems on bonding to ground enamel / Influencia da temperatura de tres sistemas adesivos na resistencia de união e na interação com esmalte bovino abrasionado

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This study evaluated the influence of adhesive temperature on microtensile (µT) bond strength of a total-etch adhesive, Primer&Bond NT (PBNT) and two self-etching adhesives, Clearfil SE Bond (SEB) and Adper Prompt L-Pop (PLP). Additionally, the etch patterns (EP) and resin-enamel interface were analyzed. Sixty-three bovine incisors were randomly divided into 3 experimental groups (N=21) according to the adhesive. Each group was subdivided into 3 sub-groups according to the temperature (NORM = 20°C; FRIO = 5°C; QNT = 40°C). The buccal enamel surfaces were flattened with 320, 400, 600-grit SiC paper and abrasioned with a diamond bur for 10s under water coolant. The adhesive were applied according to the manufacturers instructions and resin was incrementally placed in 2mm thick. Each resin increment was light cured for 40s. The specimens were sectioned in the middle. For the µT test was used incisal center, accomplished in a universal testing machine, 4 "hour glass" type specimens were tested, after was fractures type classified. The cervical middle was used for interface analyze. The sections were polished and cleanned with Argon Plasma. For the EP, 24 fragments received the same treatment of the specimens used for µT, but the surface was rinsed off after the application of the acidic solutions. EP and interface analyze were examined under a scanning electron microscope (SEM). The bond strength data were analyzed by ANOVA/Tukey test (p<5%). No significant differences were found for NORM adhesives. However, for FRIO, PBNT and APLP presented the lower bond strength means significantly differing from SEB. For QNT, the SEB and PLP presented the lowest bond strength means. Within each adhesive, the SEB used in a QNT, was the only one to present a reduction in a bond strength. There was a more enamel cohesive fracture type to PBNT. However, the self-etching adhesive presented adhesive/cohesive fracture types. The interface aspect was temperature and adhesive depended. When the APLP was applied in normal temperature there was greater similarity with the group PBNT. The result of this study was concluded that the self-etching showed a least aggressive etch patterns in relation to the Phosphoric acid and temperature change influenced adhesive µT bond strength and EP. However, they were adhesive and temperature dependent

ASSUNTO(S)

tensile strength dentistry dentistica resistencia de materiais

ACESSO AO ARTIGO

Documentos Relacionados