Repairability of dental siloranes in vitro.

OBJECTIVES

Aim of the study was the investigation of the repairability of a silorane (Filtek Silorane, 3M Espe, Seefeld, Germany) after different surface pretreatments in vitro.

METHODS

54 silorane specimens (5 mm × 5 mm × 5 mm) were fabricated and stored in saline solution (24 h/37°C). Their surface was polished with abrasive paper (600 grit), etched with phosphoric acid (10 s) and rinsed with water (30 s). Repair was performed with a silorane based on one of the 9 treatment protocols (each n=6): no additional treatment (NAT), silorane primer (P) and silorane bond (B), B only, sandblasting (SB), SB plus P/B, SB plus B, CoJet and silane (CJ), CJ plus P/B, CJ plus B. Whole silorane specimens (5 mm × 5 mm × 10 mm) with no repair served as control. Specimens were sectioned and microtensile bond strength (μTBS) was measured (30 beams per group, surface area approx. 1.2 mm², crosshead-speed 1 mm/min) statistical analysis (ANOVA, Tukey HSD, p<0.05) was performed.

RESULTS

μTBS of the specimens was significantly influenced by the surface pretreatment (p<0.001). The highest μTBS was determined for CJ/B and SB/B, which were not significantly different from the control. NAT, SB and CJ benefited from an additional treatment with B (p<0.01). The additional use of P did not improve μTBS, but was detrimental for the SB and CJ groups (p<0.05).

SIGNIFICANCE

Siloranes can be repaired with either SB or CJ in combination with a silorane bond, the additional use of silorane primer is disadvantageous.