Study of pretreatment with ethanol to compensate premature volatilization of self-etch adhesive system
10.3760/cma.j.issn.1002-0098.2014.06.010
- VernacularTitle:乙醇预处理改善自酸蚀粘接剂的效前挥发初探
- Author:
Hong LI
1
;
Hongye YANG
;
Cui HUANG
;
Donglai DENG
Author Information
1. 山东医学高等专科学校口腔医学教研室
- Keywords:
Dentin-bonding agents;
Ethanol;
Volatilization;
Tensile strength
- From:
Chinese Journal of Stomatology
2014;49(6):362-366
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of pretreatment with ethanol on dentin to compensate premature volatilization of self-etch adhesive system.Methods Thirty-two intact human molars were randomly divided into two groups using a table of random numbers (n =16):A,an acetone-base adhesive (G-bond) and B,an ethanol-based adhesive(Clearfile S3 bond).Then each group was randomly assigned into foursub groups (n =4):group 1,no premature volatilization ; group 2,premature volatilization ; group 3,premature volatilization + stepwise ethanol pretreatments; and group 4,premature volatilization ± absolute ethanol treatment.After composite resin building,microtensile bond strengths(MTBS) of each subgroup were then tested.Fracture modes were classified by stereomicroscopy and representative interface was observed by field-emission scanning electron microscopy (FE-SEM).Results For adhesive A,there was significant difference on MTBS among different subgroups(P ＜0.05) ; the MTBS of group A2[(26 ± 12) MPa] and A4[(27 ±7) MPa] was lower than that of group A1 [(41 ± 11) MPa] and A3[(40 ± 11) MPa] (P ＜ 0.05).No significant different was found between group A2 and A4 (P ＞ 0.05) ; neither between group A1 and A3 (P ＞ 0.05).For adhesive B,there was no difference on MTBS among different subgroups (P ＞ 0.05).FE-SEM showed that the main fracture mode was located at the bottom of the hybrid layer for adhesive A groups,the collagen fibrils were capsulated by resin monomers more densely in group A1 and group A3 in comparison with other two subgroups.For adhesive B groups,the main failure modes were at the top of the hybrid layer.Conclusions Premature volatilization can obviously decrease the bonding strength of acetone-base self-etch adhesives,but has no significant effect on ethanol-based self-etch adhesives.Dentin pretreatment with a series of increasing ethanol concentrations can effectively compensate the adverse effect of premature volatilization of acetone-base self-etch adhesives on bonding strength.
