The purpose of this study is to evaluate of shear bond strength of light-curing composite resin to light-curing glass ionomer cement.
Composite resin and glass ionomer cement have been widely used as an esthetic filling materials in dental clinics. To achieve better clinical results, sandwich technic was developed with conpensating for disadvantages of these two materials. Especially, light-curing glass ionomer cement provided greately improved bonding strength of teeth or composite resin, and then excellent clinical results can be acquired.
In this study, 6 commercial light-curing glass ionomer cements(3 commercial restorative materials Fuji II LC, Vanglass VLC, Vitremer, and 3 commercial lining materials : Fuji Lining LC, Baseline VLC, Vitrebond) were devided two groups. According to manufacturer´s appointment, no surface treatment was referred to N groups. Supposing of clinical practice, surface grinding with water ;spray at 320 grit sand paper, 40 seconds etching with 37% phosphoric acid, 20 seconds washing 20 seconds air drying was referred to E groups. Totally 12 experimental groups were devided, and all 120 specimens from 10 specimens of each groups were made. After light-curing composite resin was bonded to right-curing glass ionomer cement, shear bond strength was tested by Instron universal testing machine between glass ionomer cement and composit resin. The data were analyzed statistically by Student´s t-test and ANOVA.
The obtained results were as follows;
1. In light-curing glass ionomer cement, restorative materials showed higher shear bond strength to composite resin than lining matenals(p<0.05).
2. Variglass VLC of restorative material group and Baseline VLC of lining material group have highest shear bond strength to composite resin(p<0.001).
3. In light-curing glass ionomer cement:, surface grinding and acid etching reduced shear bond strengthto composite resin(p<0.001).
4. VGN group is highest shear bond strength to composite resin, VBE group is lowest shear bond strength to composite resin(p<0.001).
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