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Background <p>The aim of this study was to evaluate the shear bond strength (SBS) of aligner attachments bonded to enamel, composite-restored, and lithium disilicate glass-ceramic surfaces using flowable and high-viscosity resin composites.</p> Methods <p>Ninety extracted premolars were divided into three groups (<i>n</i> = 30) according to surface type: enamel (Group 1), composite resin restoration (Group 2), and lithium disilicate glass-ceramic (Group 3). Groups 1 and 2 were etched with 37% phosphoric acid, while Group 3 was etched with 9.6% hydrofluoric acid. A universal adhesive was applied to all specimens. Each group was divided into two subgroups based on composite type (flowable or high-viscosity universal; <i>n</i> = 15). SBS and adhesive remnant index (ARI) were evaluated. One-way ANOVA, Student’s t-test, and Fisher Freeman Halton test were used for statistical analyses (<i>p</i> &lt; 0.05).</p> Results <p>The highest SBS were obtained in Group 1 bonded with high-viscosity universal composite attachments (mean (± SD), 19.6 (± 6.7&#xa0;MPa)), and the lowest were obtained in Group 2 bonded with flowable composite attachments (mean (± SD), 7.3 (± 1.8&#xa0;MPa)). Comparison of three groups within themselves according to the composite resin factor, the mean SBS of Group 2 for high-viscosity universal resin was higher than for flowable resin (<i>p</i> &lt; 0.001). ARI scores did not show a significant correlation with either tooth surface or composite resin type.</p> Conclusions <p>High-viscosity resin composite provides more reliable bond strength than flowable composite when bonding aligner attachments to composite-restored surfaces. Both composite types demonstrated clinically acceptable bond strength on enamel and lithium disilicate surfaces.</p>

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In vitro evaluation of aligner attachment bond strength on enamel, composite, and lithium disilicate surfaces using different resin composites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Gediz Aksoz Oner,
  • Irem Sozen Yanik,
  • Dilara Sahin Hazir,
  • Ezgi Atik

摘要

Background

The aim of this study was to evaluate the shear bond strength (SBS) of aligner attachments bonded to enamel, composite-restored, and lithium disilicate glass-ceramic surfaces using flowable and high-viscosity resin composites.

Methods

Ninety extracted premolars were divided into three groups (n = 30) according to surface type: enamel (Group 1), composite resin restoration (Group 2), and lithium disilicate glass-ceramic (Group 3). Groups 1 and 2 were etched with 37% phosphoric acid, while Group 3 was etched with 9.6% hydrofluoric acid. A universal adhesive was applied to all specimens. Each group was divided into two subgroups based on composite type (flowable or high-viscosity universal; n = 15). SBS and adhesive remnant index (ARI) were evaluated. One-way ANOVA, Student’s t-test, and Fisher Freeman Halton test were used for statistical analyses (p < 0.05).

Results

The highest SBS were obtained in Group 1 bonded with high-viscosity universal composite attachments (mean (± SD), 19.6 (± 6.7 MPa)), and the lowest were obtained in Group 2 bonded with flowable composite attachments (mean (± SD), 7.3 (± 1.8 MPa)). Comparison of three groups within themselves according to the composite resin factor, the mean SBS of Group 2 for high-viscosity universal resin was higher than for flowable resin (p < 0.001). ARI scores did not show a significant correlation with either tooth surface or composite resin type.

Conclusions

High-viscosity resin composite provides more reliable bond strength than flowable composite when bonding aligner attachments to composite-restored surfaces. Both composite types demonstrated clinically acceptable bond strength on enamel and lithium disilicate surfaces.