Repair of silorane-based dental composites: Influence of surface treatments

Repair of silorane-based composites: Microtensile bond strength of silorane-based composites repaired with methacrylate-based composites

“…However, in this study, fatigue simulation did not change the bond strengths in any of the test. In our previous study, in contrast to common experience, fatigue simulation increased the bond strength of repaired silorane-based composite materials under the same conditions of fatigue used in this study except for the group treated by silane coupling agent and bonding agent, and we concluded that the improved repair strength after fatigue simulation seems to be a result of the post-curing effects of the bonding agent and repair materials 13) . The reason why fatigue simulation did not change the bond strengths in the present study despite identical conditions of fatigue is that the repair bond strengths between the dissimilar composites (siloranebased composite and methacrylate-based composite) were not durable.…”

“…In our previous study, it is reported that the application of Xeno V had nearly no additional benefit on the repair strength of Ceram X for the same reason 12) . Higher-filled or less sculptable composite materials such as Filtek Silorane might benefit more from the application of a bonding agent, as described in our precious study of the repair strength of Silorane 13) . In addition, silorane-based composites are hydrophobic compared to methacrylate-based composites, and thus the bonding agent might not have increased the wettability of the surfaces.…”

“…Before fatigue simulation, all treatments of this study led to bonding between the silorane-based material and the methacrylate-based repair composite that is strong enough to be clinically useful, compared with the repair bond strength between the same composites under the same conditions in our previous studies for reference 12,13) . Thermocycling is a combination of hydrolytic degradation and thermal stresses and is a method to simulate temperature-related breakdown by repeated sudden temperature changes.…”

“…3). In our previous study about the repair of silorane-based dental composites, the digitized SEM image revealed that 5.1% of the exposed surface of aged silorane-based composite could be identified as uncovered filler surface 13) . We concluded that in spite of the smaller proportion of uncovered filler surface on the silorane-based composite, surface treatment with silane was more effective than just roughening the surface, suggesting that silane imparts a beneficial effect through its excellent wetting properties.…”

“…The most common suggestions include increased surface roughness 7,8) , silane treatment 9,10) and the application of a low viscous bonding agent 10,11) . In our previous study, we evaluated the effects of surface treatments on the bond strengths of repaired methacrylate-based dental composite materials including nanofillers 12) and repaired silorane-based dental composite materials 13) . The purpose of the present study was to evaluate how to optimize the bond strength of silorane-based dental composites when they are repaired with a methacrylate-based restorative material.…”