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<p>This <i>in vitro</i> study aimed to evaluate the shear bond strength of four different bioactive restorative materials to dentin prepared using either a high-speed bur or Er, Cr: YSGG laser. A total of 120 extracted human molars were divided into two groups (<i>n</i> = 60) based on dentin surface preparation: high-speed diamond bur or Er,Cr:YSGG laser (3&#xa0;W, 20&#xa0;Hz, 70% H₂O, 60% air). Each group was further divided into four subgroups (<i>n</i> = 15) according to the restorative material: Group I–glass hybrid (EQUIA Forte HT), Group II–bioactive resin composite (Activa BioActive-Restorative), Group III–giomer (Beautifil II), and Group IV–alkasite (Cention Forte). Materials were applied per manufacturers’ instructions using a standardized Teflon mold system. After 24&#xa0;h, shear bond strength was tested with a universal testing machine at 1.0&#xa0;mm/min. One sample per group was examined under SEM to assess the resin–dentin interface. Data were analyzed using two-way ANOVA and Games Howell post hoc test (<i>p</i> &lt; 0.05). Group IV showed the highest bond strength in both surface treatments, while Group I had the lowest (<i>p</i> &lt; 0.05). In Group II, laser treatment resulted in a statistically significant reduction in bond strength compared to bur-prepared surfaces (<i>p</i> &lt; 0.05), whereas surface preparation had no significant effect on the bond strength of the remaining groups. Adhesive failures were most common, though cohesive failures were more frequent in Group II-Bur and Group I-Laser. The bonding performance of bioactive restorative materials was influenced by both their composition and the dentin surface preparation method. Cention Forte showed the most reliable adhesion on both bur- and laser-prepared dentin, whereas EQUIA Forte HT exhibited lower bonding performance.</p>

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Can lasers replace conventional methods in optimizing bond strength of bioactive materials?

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Cansu Atalay,
  • Ahmet Burak Yuksel,
  • Ayse Ruya Yazici

摘要

This in vitro study aimed to evaluate the shear bond strength of four different bioactive restorative materials to dentin prepared using either a high-speed bur or Er, Cr: YSGG laser. A total of 120 extracted human molars were divided into two groups (n = 60) based on dentin surface preparation: high-speed diamond bur or Er,Cr:YSGG laser (3 W, 20 Hz, 70% H₂O, 60% air). Each group was further divided into four subgroups (n = 15) according to the restorative material: Group I–glass hybrid (EQUIA Forte HT), Group II–bioactive resin composite (Activa BioActive-Restorative), Group III–giomer (Beautifil II), and Group IV–alkasite (Cention Forte). Materials were applied per manufacturers’ instructions using a standardized Teflon mold system. After 24 h, shear bond strength was tested with a universal testing machine at 1.0 mm/min. One sample per group was examined under SEM to assess the resin–dentin interface. Data were analyzed using two-way ANOVA and Games Howell post hoc test (p < 0.05). Group IV showed the highest bond strength in both surface treatments, while Group I had the lowest (p < 0.05). In Group II, laser treatment resulted in a statistically significant reduction in bond strength compared to bur-prepared surfaces (p < 0.05), whereas surface preparation had no significant effect on the bond strength of the remaining groups. Adhesive failures were most common, though cohesive failures were more frequent in Group II-Bur and Group I-Laser. The bonding performance of bioactive restorative materials was influenced by both their composition and the dentin surface preparation method. Cention Forte showed the most reliable adhesion on both bur- and laser-prepared dentin, whereas EQUIA Forte HT exhibited lower bonding performance.