Bond strength of endodontic sealers after intracanal surface pretreatment with CO2 laser

Resumo

The aim of this study was to evaluate in vitro the
bonding of AH Plus and Endofill sealers to intraradicular canal walls
after different dentin surface treatments. Material and methods: Sixty
canines were sectioned obtaining dentin discs with 4-mm thickness
and were embedded in acrylic resin. The canals were prepared
with diamond burs. The specimens were divided into two groups
(n = 30): GI – AH Plus and GII – Endofill and were subdivided into three
groups based on the dentin surface treatment (n = 10): A – distilled
and deionized water (control), B – 17% EDTA, C – CO2 laser with 3W
in continuous mode for 10s. The specimens were submitted to push
out test in a universal testing machine. Results: Tukey test revealed
that the IB (AH Plus/17% EDTA) (17.59 ± 6.04) and IC (AH Plus/CO2
laser) (21.69 ± 4.93) subgroups had the highest values, which were
statistically similar between each other (p > 0.05) and different from
the other subgroups (p < 0.05). IIC subgroup (Endofill/CO2 laser)
(7.25 ± 1.59) had intermediate values, which were statistically similar
to (p > 0.05) IA subgroup (AH Plus/water) (10.99 ± 2.63), IIA subgroup
(Endofill/water) (3.16 ± 0.83) and IIB subgroup (Endofill/ 17% EDTA)
(5.31 ± 3.61), which had the smallest values (p < 0.05). Conclusion:
The treatment of superficial intracanal dentin with CO2 laser and
EDTA favored the adhesion of AH Plus and Endofill sealers.