Article Type

Original Article


Restorative Dentistry



To evaluate the effect of different surface pretreatment agents on µTBS and micromorphology of MDPB-containing adhesive/dentin interface.


In all, 56 human molars were divided according to the used pretreatment material (chlorohexidine, riboflavin, papain, and untreated control group) and then divided according to the aging time (immediate: 24 h and delayed: after 6 months). Teeth were restored using the MDPB-containing bond followed by the resin composite. µTBS test was done followed by failure mode analysis. Another 16 molars following the previous study design were used to evaluate the micromorphology of restoration/tooth interface.


Two-way ANOVA test showed that the ‘adhesive type’ and ‘time’ had significant differences in the µTBS results. Multiple comparison tests showed that surface pretreatment in the immediate groups using CHX had the highest bond strength followed by control, papain, and riboflavin respectively. Furthermore, CHX had a significant difference (P

Delayed groups

Degradation of interface was mostly marked in the riboflavin group. Resin tag infiltration was found the most in the papain group also.


Application of surface pretreatment materials such as CHX or riboflavin before bonding resulted in bond strength deterioration while papain improved results with aging.


CHX, MDPB, microtensile, papain, riboflavin