The aim of this study was to evaluate the bonding strength of a siloranebased composite when two different types of equipment was used for preparation of dentin (Er-YAG laser and carbide bur)
Materials and Methods:
Sixteen decay-free human molars sectioned in mesio-distal aspect. Dentin specimens were treated either with carbide bur or with an Erbium:YAG laser. Silorane System Adhesive and Single Bond were applied, according to manufacturer's instructions. In order to eliminate the bonded surface, a cylindrical teflon mould (3 x 4 mm) was placed over the bonded area. The composite were used, combined for each one of the adhesive systems (Filtek silorane and Z-250). The specimens stored in water at 370 C, for 24h and then stressed at a rate of 0.05 mm/min until failure. Failure patterns were analyzed at stereomicroscope and SEM.
A 2-way ANOVA was conducted. Pairwise comparisons, the Bonferoni test were used.
The main effect of Material, Z-250 and Silorane was not significant p=0.457. The main effect of Treatment bur cut and laser irradiation was not significant p=0.457. Also the interaction effect between Material and Treatment was found to be not significant p=0.974. Particularly there was not any significant difference between the mean values of Z-250 and Silorane when carbide bur cut was used p=0.582. There was no significant difference between the mean values of Z-250 and Silorane when laser irradiation was used p=0.614. In addition, there was no significant difference between the mean values of bur and laser when material Z-250 was used, p=0.614 and there was no significant difference between the mean values of bur and laser when material Silorane was used p=0.582.
Adhesion of a siloranebased composite bonded to the Er-YAG laser-irradiated dentin using its adhesive appeared equal to those obtained for a bur-cutting dentin.