Two-Year Interfacial Bond Durability and Nanoleakage of Repaired Silorane-Based Resin Composite

Abstract

Silane application is not mandatory for repairing silorane-based resin composite, which can be successfully repaired even with different repair adhesive/materials. However, early signs of nanoleakage can be detected. SUMMARYObjectives: To investigate the effect of silane primer application, intermediate adhesive agent/repair composite, and storage period on the interfacial microtensile bond strength (lTBS) of repaired silorane-based resin composite compared with unrepaired composites and on the nanoleakage.Methods: Forty-eight 1-month-old substrate specimens from Filtek P90 were roughened, etched, and distributed over two groups (n=24) based on receiving silane (Clearfil Ceramic Primer) or not. Then, half of the specimens (n=12) were repaired with P90 System Adhesive/Filtek P90 and the other half with Adper Scotchbond Multipurpose adhesive/Filtek Z250 resin composite. Within each repair category, repaired specimens were stored in artificial saliva at 378C for either 24 hours (n=6) or two years before being serially sectioned into sticks (0.6 6 0.01 mm 2 ). From each specimen, two sticks were prepared for nanoleakage determination and four sticks were used for lTBS testing. Additional unrepaired specimens from each composite (n=12) were made to determine the cohesive strength at 24 hours and two years. Mean lTBS were calculated and statistically analyzed. Modes of failure were also determined.Results: General linear model analysis revealed no significant effect for the silane priming, intermediate adhesive agent/repair composite, and storage period or for their interactions on the lTBS values of the repaired specimens. There was no significant difference between the cohesive strength of Filtek P90 and Filtek Z250; both were significantly higher

Effect of surface conditioning methods, adhesive systems and resin composite on repair strength of dimethacrylate and silorane resin composites

“…Similar results were observed in a previous study using only the primer of LS compared to repairs using only the adhesive resin of this system [10]. On other hand, AS is a conventional two-steps self-etching adhesive The present study evaluated the effect of combination of resin composite, adhesive system, and surface conditioning on the repair bond strength of silorane composite, differing from previous studies [10,15,18,23,24]. The results demonstrated that the combination of surface conditioning with a bur, followed by application of methacrylatebased adhesive resin could be advised for the repair of silorane resin composite.…”

“…The specimens were removed from the matrix and the area to be repaired was finished with abrasive discs (Soflex, 3M ESPE) to remove the oxygen-inhibited layer. The specimens were stored in distilled water at 37 o C for 24 h [3,15].…”

“…Although previous studies have evaluated the silorane repair [10][11][12][13][14][15], none of them investigated the influence of other adhesives different than the silorane specific adhesive in combination with different surface conditioning methods and resin composites.…”

“…However, limited information is available on the repair potential of low shrinkage silorane composite and its compatibility with the methacrylate-based resin composite [10][11][12][13][14][15].…”

Reparability of giomer using different mechanical surface treatments

“…Repair is more conservative compared to the replacement of restorations and can increase the longevity of restorations at a lower cost (5). In addition, it might prevent pulpal irritation (6,7) and detrimental changes in odontoblasts (1). …”