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Damage and Fatigue Failure of Conventional and Bulk-Filled Resin Composites

Open Journal of Stomatology 2022年第2期12卷 62-76页

作者： Rana Alkattan subir banerji Sanjukta Deb Centre for Oral Clinical and Translational Sciences Faculty of Dentistry Oral and Craniofacial Sciences King’s College London London United Kingdom Department of Restorative Dental Science King Saud Bin Abdulaziz University for Health Sciences Riyadh Saudi Arabia Department of Prosthodontics University of Melbourne Melbourne Australia

Objectives: Resin-based composites are the most widely used dental restorative materials. Bulk-fill resin composites are of rising interest as they can be clinically applied in thicker increments compared to conventional composites. The purpose of the study was to evaluate the flexural fatigue strength of a conventional and bulk-filled resin composite placed incrementally or non-incrementally. Methods: Resin composite specimens were fabricated using either a conventional (Brilliant EverGlow?) or a bulk-fill (Fill-Up!TM) resin composite by either non-incremental filling (2 × 2 × 25 mm3) or in increments of (1 × 2 × 25 mm3). Specimens were stored in distilled water for 24 h or thermocycled for 5000 cycles. The static flexural strength (σ), flexural fatigue limit (FFL) after 105 cycles and post-fatigue flexural strength (PFσ) were measured. Data were analyzed using ANOVA, with a post-hoc Tukey’s test to compare mean FFL (p σ and PFσ compared to conventional composites regardless of incremental cure or thermocycling (p σ and FFL for conventional composites but not bulk-filled composites. There was no significant difference in PFσ compared to σ after 24 h storage, but a significant increase in PFσ after thermocycling (p < 0.05). Conclusions: The type of composite rather than incremental placement had a greater effect on flexural strength, suggesting that operator placement technique had less influence than material selection. Thermocycling in combination with cyclic loading caused a strengthening effect in the composites, likely due to the absorption and dissipation of stresses, thereby enhancing resistance to fracture.

关键词： Cyclic Fatigue Flexural Fatigue Limit Flexural Strength Bulk-Fill Resin Composite Incremental Layering

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