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Purpose <p>This in vitro study aimed to compare the shear bond strength (SBS) and Adhesive Remnant Index (ARI) scores of two-step orthodontic bonding systems: self-etching primer (SEP) and a&#xa0;self-adhesive composite. Both systems were compared to a&#xa0;control group with a&#xa0;conventional three-step adhesive.</p> Methods <p>A total of 72&#xa0;extracted maxillary and mandibular premolars were randomly divided into four groups (<i>n</i> = 18): group&#xa0;1(XT), the control group, used Transbond™ XT (conventional adhesive; 3M Unitek, Monrovia, CA, USA); group&#xa0;2 (GC) used GC Ortho Connect™ (self-adhesive composite; GC Orthodontics Inc., Tokyo, Japan); group&#xa0;3 (GCP) used GC primer with GC Ortho Connect™; and group&#xa0;4 (SEP) used Transbond™ Plus Self-Etching Primer with Transbond™ XT. Teeth were stored in water at 37 °C for 24 h prior to SBS testing using an Instron 5543 device (Instron, Norwood, MA, USA), and ARI scores were assessed under a&#xa0;stereomicroscope. Data were analyzed using analysis of variance (ANOVA) and nonparametric tests.</p> Results <p>In total, 60&#xa0;samples were analyzed. The GCP group exhibited the highest SBS (8.35 MPa ± 1.99), significantly higher than the XT (4.99 MPa ± 1.32, <i>p</i> &lt; 0.001) and SEP (5.69 MPa ± 2.10, <i>p</i> = 0.001) groups. The GC group (7.50 MPa ± 1.92) also showed higher SBS than XT (<i>p</i> = 0.003) and the SEP group (<i>p</i> = 0.048). ARI scores showed no significant difference between groups overall (<i>p</i> = 0.303), but the GCP group had significantly higher ARI scores than the SEP group (<i>p</i> = 0.023).</p> Conclusion <p>GC Ortho Connect™ with or without primer demonstrated superior bond strength compared to conventional and self-etching systems, making it a&#xa0;viable alternative for clinical use. Further in vivo studies are needed to confirm these findings.</p>

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Comparative in vitro study of bond strength of two-step orthodontic bonding systems

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Marwan El Helou,
  • Eva Canamas,
  • Emmanuel Nicolas,
  • Alexis Gravier,
  • Elias Estephan,
  • Frederic Cuisinier,
  • Stephane Barthelemi

摘要

Purpose

This in vitro study aimed to compare the shear bond strength (SBS) and Adhesive Remnant Index (ARI) scores of two-step orthodontic bonding systems: self-etching primer (SEP) and a self-adhesive composite. Both systems were compared to a control group with a conventional three-step adhesive.

Methods

A total of 72 extracted maxillary and mandibular premolars were randomly divided into four groups (n = 18): group 1(XT), the control group, used Transbond™ XT (conventional adhesive; 3M Unitek, Monrovia, CA, USA); group 2 (GC) used GC Ortho Connect™ (self-adhesive composite; GC Orthodontics Inc., Tokyo, Japan); group 3 (GCP) used GC primer with GC Ortho Connect™; and group 4 (SEP) used Transbond™ Plus Self-Etching Primer with Transbond™ XT. Teeth were stored in water at 37 °C for 24 h prior to SBS testing using an Instron 5543 device (Instron, Norwood, MA, USA), and ARI scores were assessed under a stereomicroscope. Data were analyzed using analysis of variance (ANOVA) and nonparametric tests.

Results

In total, 60 samples were analyzed. The GCP group exhibited the highest SBS (8.35 MPa ± 1.99), significantly higher than the XT (4.99 MPa ± 1.32, p < 0.001) and SEP (5.69 MPa ± 2.10, p = 0.001) groups. The GC group (7.50 MPa ± 1.92) also showed higher SBS than XT (p = 0.003) and the SEP group (p = 0.048). ARI scores showed no significant difference between groups overall (p = 0.303), but the GCP group had significantly higher ARI scores than the SEP group (p = 0.023).

Conclusion

GC Ortho Connect™ with or without primer demonstrated superior bond strength compared to conventional and self-etching systems, making it a viable alternative for clinical use. Further in vivo studies are needed to confirm these findings.