Objectives:The aim of this study was to evaluate the bond strength between a resin composite core material to prefabricated DT Light Post®, after four different surface treatments. Methods: The fiber posts were divided in 8 groups (n=14). In this present study, Enforce Core® (dual) was tested as core material involving the fiber posts. Firstly, half of them have received a thin layer of One Step Plus®. Each prefabricated post was submitted to one of this treatment: none (N), micro-etcher–Cojet® (M), silane (S) and micro-etcher followed by silane (MS). The core material was inserted between a polyester matrix and the fiber post, then it was curing with halogen light (Optilux 600®-Demetron), according to the manufacturer's instructions. After that, the core build-up samples were stored in distilled water (24h-37ºC). Finally, they were longitudinally sectioned using the Labcut 1010 machine® (0,8mm each slice) and tested in microtensile mode at a crosshead speed of 0,5mm/min. Results: The results were analyzed by Aspin-Welch test. The mean for each group (MPa) with adhesive were:S:11.9 (SD:4,5), MS:12.98 (SD:3.87), M:12.58 (SD:5.12) and N:13.26(SD:3.35). On the other hand, the group without adhesive has shown this data: MS:14.39(SD:4.8), M:9.16(SD:3.28), S:9.83(SD:5.53) and N:13.26(SD:6.8).
Conclusions:For this study, fiber posts treated with S, M or MS pre-conditioned with adhesive have demonstrated higher micortensile means than N (p<0.05). Moreover, the samples without adhesive previous treatment have indicated higher microtensile results with N and MS than S and M individually (p<0.05).