RESUMO
Degradation of the hybrid layer created in dentin by dentin adhesives is caused by enzyme activities present within the dentin matrix that destroy unprotected collagen fibrils. The aim of the present study was to evaluate the effect of a one-step self-etch adhesive system on dentinal matrix metalloproteinases 2 and 4 (MMP-2 and MMP-9, respectively) using in situ zymography and an enzymatic activity assay. The null hypothesis tested was that there are no differences in the activities of dentinal MMPs before and after treatment with a one-step adhesive system. The MMP-2 and MMP-9 activities in dentin treated with the one-step adhesive, Adper Easy Bond, were quantified using an enzymatic activity assay system. The MMP activities within the hybrid layer created by the one-step adhesive tested were also evaluated using in situ zymography. The enzymatic assay revealed an increase in MMP-2 and MMP-9 activities after treatment with adhesive. In situ zymography indicated that gelatinolytic activity is present within the hybrid layer created with the one-step self-etch adhesive. The host-derived gelatinases were localized within the hybrid layer and remained active after the bonding procedure. It is concluded that the one-step self-etch adhesive investigated activates endogenous MMP-2 and MMP-9 with the dentin matrix, which may cause collagen degradation over time.
Assuntos
Resinas Compostas/química , Adesivos Dentinários/química , Dentina/efeitos dos fármacos , Dentina/enzimologia , Metaloproteinase 2 da Matriz/metabolismo , Metaloproteinase 9 da Matriz/metabolismo , Humanos , Técnicas In Vitro , Dente SerotinoRESUMO
Com o advento dos sistemas adesivos e sua rápida evoluçäo, podemos solucionar, de forma simples e rápida, alguns problemas encontrados na clínica diária, proporcionando ao paciente restauraçöes diretas ou indiretas mais conservativas, estéticas, e devido à sua adesäo às estruturas dentais, com menos microinfiltraçäo e consequente cárie secundária. O objetivo deste trabalho é, através da literatura, mostrar as características dos sistemas adesivos, sua evoluçäo e algumas de suas aplicaçöes na odontologia
