Effect Of Surface Treatment Reagents And Treatment Time On Bond Strength Between Glass Fiber Posts And Resin Cement

ObjectiveAt present,there is no uniform standard for the treatment time of chemical reagents and reagents used for surface treatment of glass fiber posts.Therefore,it is of great significance to study the effects of surface treatment reagents and treatment time on the bond strength between glass fiber post and resin cement.In this study,two kinds of chemical reagents were used to pretreat the glass fiber posts at different times,and the influence of the glass fiber posts on the bonding strength between the glass fiber posts and the resin cements was evaluated,in order to provide theoretical and research basis for the clinical use of fiber posts.MethodAccording to the different surface treatment methods,48 glass fiber posts were randomly divided into 8 groups of 6 each.Group A was the control group(no special treatment);Group B was the silane group(silanization treatment for 1 min);Group C was the hydrogen peroxide treatment group,divided into 3 groups,C1 group(30%H2O2 surface treatment for 5 min+Silanization 1 min),C2 group(30%H2O2 surface treatment 10 min+silanization 1 min),C3 group(30%H2O2 surface treatment 15 min+silanization 1 min);Group D is phosphoric acid treatment group,divided into 3 groups,D1 group(35%phosphoric acid surface treatment 30 s+silanization 1 min),D2 group(35%phosphoric acid surface treatment 60 s+silanization 1 min),D3 group(35%phosphoric acid surface treatment 90 s+silanization 1 min);use A silicone rubber impression material and a transparent polyethylene resin tube are used to make a mold,and the surface-treated fiber post is fixed in the center of the plastic tube and perpendicular to the bottom surface.After the resin cement is injected into the mold,the photo-curing lamp is uniformly irradiated from different directions,and the mold is irradiated.After removal,a cylindrical resin block is obtained;the resin block is sliced at a thickness of 1 mm per piece perpendicular to the longitudinal axis of the fiber post using a low speed cutter,and the sample amount is 20 per group;the micro-extrusion test was carried out on the sheet specimen using a universal testing machine,and the maximum breaking load value F was recorded,and the bonding area S and the bonding strength P of the fiber post section in the specimen were calculated;after that,the stereoscopic microscope was used to observe the micro-injection test;the thin slices were observed for the failure mode of the test piece;one glass fiber post was randomly selected from each group,and the surface morphology of the fiber post was observed under a scanning electron microscope(SEM);the statistical analysis of the experimental data was performed by SPSS 25.0 software,five groups of A,B,C1,C2,and C3 and A,B,D1,D2,and D3 were analyzed by one-way analysis of variance,and then LSD-t test was used to compare the two groups,the failure mode distribution of each group of test pieces was compared by the χ2 test.Result1.Bonding strength of each group:Group A(15.27 ± 1.16)Mpa,Group B(15.71 ±1.01)Mpa,Group C1(21.57 ± 1.83)Mpa,Group C2(24.07 ± 1.56)Mpa,Group C3(24.80±1.40)Mpa,D1 group(17.77± 1.77)Mpa,D2 group(19.30±0.96)Mpa,D3 group(19.05±1.16)Mpa.2.The failure mode of the specimen sample is dominated by bond failure.3.The SEM results show that the surface of the fiber post has different degrees of matrix dissolution and fiber bundle exposure after treatment,but the fiber bundle integrity is not destroyed.4.Comparison of five groups A,B,C1,C2,C3:There was no significant difference between group A and group B,group C2 and group C3(P>0.05),and the differences between the two groups were statistically significant(P<0.05);A,B,D1,D2,D3 five groups:A and B group,D2 and D3 group no significant difference(P>0.05),the other two groups were statistically significant(P<0.05).ConclusionThe results show that the optimal treatment time of 30%hydrogen peroxide solution is 10 min,and the optimal treatment time of 35%phosphoric acid is 60 s.30%hydrogen peroxide solution treated the surface of the fiber post for 10 min,the bonding strength is maximum,which has great clinical application significance.