Evaluation of Shear Bond Strength of Orthodontic Brackets with Color-changing Adhesives on Fluorosed Teeth: A...

To evaluate and compare the shear bond strength (SBS) and adhesive remnant index (ARI) scores of four different orthodontic bracket system bonded to fluorosed enamel surfaces using two color-changing adhesive materials.

The sample consisted of 48 extracted human premolar teeth with fluorosis, intended for orthodontic purposes. These were divided into two groups: group I and group II, each comprising 24 samples. Group I samples were bonded with Ormco Grengloo, while group II samples were bonded with 3M Transbond XT Plus. Each group was further subdivided into four subgroups of six samples each, based on the type of brackets used: subgroup A - metal conventional brackets (CBs), subgroup B - metal self-ligating brackets (SLBs), subgroup C - ceramic CBs, and subgroup D - ceramic SLBs. Prior to bonding, all teeth were thermocycled 500 times. The brackets were then debonded using a universal testing machine at a crosshead speed of 1 mm/min. The debonding force was applied in the occlusogingival direction and recorded in Newtons. Statistical comparison of the bond strengths among subgroups was carried out using the ANOVA test.

The analysis revealed a material- and bracket-type-dependent variations in SBS. In group I, subgroup B exhibited the highest SBS, while subgroup C showed the lowest. In group II, subgroup D demonstrated the highest SBS, whereas subgroup A had the lowest. These differences were statistically analyzed using ANOVA, confirming significant variation based on both adhesive type and bracket configuration.

These findings suggest that SLBs, both metal and ceramic, generally provide stronger bonds compared to CBs, regardless of the adhesive used. Ormco Grengloo adhesive appears to be more effective for bonding metal CBs and metal SLBs, while Transbond XT Plus excels in bonding ceramic CBs and ceramic SLBs.

This study helps orthodontists choose the best bracket-adhesive combinations for fluorosed teeth, improving bond strength, reducing treatment delays, and making bonding easier with color-changing adhesives. It supports personalized treatment, better bracket retention, and fewer bond failures in patients with enamel fluorosis, making orthodontic care more effective and efficient. How to cite this article: Goswami M, Wadhawan A, Nagar S, et al. Evaluation of Shear Bond Strength of Orthodontic Brackets with Color-changing Adhesives on Fluorosed Teeth: A Randomized Clinical Trial. J Contemp Dent Pract 2025;26(7):652-657.