Effect of thermal cycling on the composite-composite repair bond strength
10.3760/cma.j.issn.1002-0098.2015.08.009
- VernacularTitle:温度循环老化对复合树脂间粘接强度的影响
- Author:
Chang LIU
1
;
Fei LIN
;
Lin YUE
Author Information
1. 100081,北京大学口腔医学院·口腔医院牙体牙髓科
- Keywords:
Composite resins;
Resin cements;
Tensile strength;
Bonding;
Thermal cycling
- From:
Chinese Journal of Stomatology
2015;50(8):483-487
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of aging of the composite and the adhesive interface on composite-composite repair bond strength.Methods Methacrylate-based composite resin(Clearfil AP-X,composite A) and silorane-based composite resin(Filtek P90,composite B) and their corresponding adhesive,Clearfil SE Bond(adhesive a) and Filtek P90 System Adhesive(adhesive b),were selected in this study.Twenty-four substrates were prepared from composite A or B separately and divided into three groups,each group had 8 substrates:group one,new composites were adhered to the substrates with the use of adhesive a or b,followed by cutting the blocks into sticks;group two,new composites were adhered to the substrates using adhesive a or b,followed by cutting into sticks and thermal cycling;group three,substrates were thermocycled,then polished and adhered new composites using adhesive a or b,followed by cutting into sticks.Each group had 8 combinations of substrate(A,B)-adhesive(a,b)-repair composite(A,B).Fifteen sticks without flaws in each combination of 3 groups were selected utilizing stereomicroscope.The data were analyzed by independent samples t test.Results In group two,the microtensile strength(MS) of combinations using adhesive a and composite A or B to repair[A-a-A:(45.0±3.2) MPa,B-a-A:(41.7±3.3) MPa,A-a-B:(28.6±3.9) MPa,B-a-B:(47.7±6.6) MPa],and using adhesive b and composite A to repair[A-b-A:(44.2±4.7) MPa,B-b-A:(38.0±3.2) MPa] decreased significantly compared with corresponding combinations in group 1[A-a-A:(70.7±5.5) MPa,B-a-A:(60.3±5.1) MPa,A-a-B:(44.2±1.6) MPa,B-a-B:(54.1±3.2) MPa,A-b-A:(65.6±7.2) MPa,B-b-A:(59.1±4.1) MPa] (P＜0.05).However,there was no significant difference between the MS of combinations using adhesive b and composite B to repair in group one and the MS of combinations in group two(P＞0.05).The MS of all combinations in group three decreased significantly(P＜0.05).Conclusions Aging of the composite and the adhesive interface might affect the composite-composite repair bond strength.
