ArticleFrontiers in dental medicine2026
Effect of laser pulse energy and repair composite viscosity on the repair shear bond strength of aged bulk-fill resin composites.
Article in Frontiers in dental medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Repairing failed resin composite restorations remains clinically challenging, and the longevity of repaired restorations depends on achieving a strong interfacial bond. This study evaluated the influence of different surface treatments and repair composite types on the repair shear bond strength (RBS) of aged bulk-fill resin composites. Materials and methods: One hundred and fifteen standardized Filtek™ One Bulk-Fill Restorative (3M) composite discs (4 mm × 10 mm) were thermocycled (5,000 cycles, 5-55 °C). Specimens were divided into five surface treatment groups: Er:YAG laser at 50 mJ (L50), 150 mJ (L150), and 250 mJ (L250), air abrasion (A), and diamond bur control (B). After surface treatment, a universal adhesive was applied, and three composite cylinders (2 mm × 2 mm) were built per specimen using either Filtek Z250 XT Nano-Hybrid (N), Filtek Bulk-Fill Flowable (F), or Filtek One Bulk-Fill Restorative (R) ( Results: Surface treatment and its interaction with the repair composite type significantly influenced RBS ( Conclusions: High-energy Er:YAG laser (250 mJ) and air abrasion significantly enhanced repair bond strength by generating retentive surface topographies. The repair composite type had minimal influence, though low-viscosity materials performed better on highly ablated surfaces due to improved flow and adaptation.
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