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Objectives <p>The objective of this in vitro study was to evaluate whether a reduced phosphoric acid etching time would have an impact on the microtensile bond strength (µTBS) of different universal adhesives to dentin using a bulk-fill composite.</p> Methods <p>Forty-eight freshly extracted non-carious human molars were immersed in acrylic resin and cut to a height of 4&#xa0;mm from the highest tubercle crest towards the cervical region. Dentin surfaces were subjected to 37% phosphoric acid pretreatment for 0, 3, or 15&#xa0;s (s), rinsed with water for 20&#xa0;s and gently dried, and wet-bonded. Two universal adhesives (Single Bond Universal, 3&#xa0;M-ESPE; Adhese Universal, Ivoclar Vivadent) were used in this study. The Tofflemire matrix was added to each tooth, and a bulk-fill resin composite (Tetric EvoCeram Bulk-Fill, Ivoclar Vivadent) with a thickness of 5&#xa0;mm was applied. The tooth composite blocks were cured using a light-emitting diode unit for either 20–40&#xa0;s. Twelve groups were included (four teeth per group). All samples were immersed in distilled water for 24 h at 37°C. The samples were sectioned under water cooling to obtain multiple sticks approximately 1.0 × 1.0 × 8 mm<sup>3</sup> in size using a non-trimming technique with water cooling. The µTBS test was performed (<i>n</i> = 20 sticks for each group). The data were analysed via a Welch analysis of variance (ANOVA) and the Games–Howell post hoc test (SPSS 23.0). The interactions between the three factors were analysed with a three-way ANOVA.</p> Results <p>Significant differences were observed among the experimental groups (<i>p</i> &lt; 0.05). Both adhesives exhibited the highest bond-strength values in the groups for which acid was applied to the dentin for 3&#xa0;s and the composite resin was light-cured for 40&#xa0;s, resulting in statistically significantly higher values for these two groups compared with the other groups (<i>p</i> &lt; 0.05).</p> Conclusion <p>Reducing the etching time to 3&#xa0;s compared to the traditional etching time of 15&#xa0;s increased the micro-tensile bond strength of the bulk-fill composite to dentin using universal adhesives.</p>

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Does reducing the acid-etching time increase the micro-tensile bond strength of a bulk fill composite to dentin using different universal adhesives?

  • 期刊论文

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  • 发表日期：

    2025年3月20日

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  • Elif Öztürk,
  • Omer Taha Meric,
  • Dilek Helvacioglu-Yigit

摘要

Objectives

The objective of this in vitro study was to evaluate whether a reduced phosphoric acid etching time would have an impact on the microtensile bond strength (µTBS) of different universal adhesives to dentin using a bulk-fill composite.

Methods

Forty-eight freshly extracted non-carious human molars were immersed in acrylic resin and cut to a height of 4 mm from the highest tubercle crest towards the cervical region. Dentin surfaces were subjected to 37% phosphoric acid pretreatment for 0, 3, or 15 s (s), rinsed with water for 20 s and gently dried, and wet-bonded. Two universal adhesives (Single Bond Universal, 3 M-ESPE; Adhese Universal, Ivoclar Vivadent) were used in this study. The Tofflemire matrix was added to each tooth, and a bulk-fill resin composite (Tetric EvoCeram Bulk-Fill, Ivoclar Vivadent) with a thickness of 5 mm was applied. The tooth composite blocks were cured using a light-emitting diode unit for either 20–40 s. Twelve groups were included (four teeth per group). All samples were immersed in distilled water for 24 h at 37°C. The samples were sectioned under water cooling to obtain multiple sticks approximately 1.0 × 1.0 × 8 mm3 in size using a non-trimming technique with water cooling. The µTBS test was performed (n = 20 sticks for each group). The data were analysed via a Welch analysis of variance (ANOVA) and the Games–Howell post hoc test (SPSS 23.0). The interactions between the three factors were analysed with a three-way ANOVA.

Results

Significant differences were observed among the experimental groups (p < 0.05). Both adhesives exhibited the highest bond-strength values in the groups for which acid was applied to the dentin for 3 s and the composite resin was light-cured for 40 s, resulting in statistically significantly higher values for these two groups compared with the other groups (p < 0.05).

Conclusion

Reducing the etching time to 3 s compared to the traditional etching time of 15 s increased the micro-tensile bond strength of the bulk-fill composite to dentin using universal adhesives.