A Study on Repair Restoration with High Filler Containing Indirect Composites

Surface Treatment for Light Cured Type Resins

Abstract

Purpose: We aimed to know the most effective surface treatment in repair restoration of light cured type of the high filler containing indirect composites.
Method: Indirect composite specimens (2×2×12.5mm) were made of Artglass (AE, AD) and Gradia (GE, GD). Specimens (2×2×25mm) for the bending bond strength test were made of indirect composite specimens and repair resins such as Charisma or Unifil S for the direct method and AE or GE for the indirect method. All resins were polymerized according to the manufacturer's instructions. Four kinds of surface treatments to the bonding surface were used as follows: no treatment (NT), silane treatment (S), bonding treatment (B), silane+bonding treatment (SB).Bending bond strength was determined by the three-point bending test after 24 hours storage in distilled water (37°C).
Results: In the direct method, significantly higher bending bond strength was recognized in SB for AE and in SB for AD, GE and in SB and B for GD (one-way ANOVA, p<0.05). On the other hand, in the indirect method, significantly higher bending bond strength was recognized in SB and S for AE, in SB for AD, in SB, S and B for GE and GD. SEM observation of the adhesion surface after bonding test showed adhesive failure in NT and cohesive failure in SB, S and B.
Conclusions: SB were effective surface treatments in both direct and indirect repair restorations of AE. SB, S and B were effective surface treatments in indirect repair restorations of GE.