New generation of color bonding: a comparative in vitro study

Area of Science:

• Orthodontic Materials Science
• Dental Adhesives Research
• Biomaterials Engineering

Background:

• Newer composite resin adhesives feature chromatic agents that change color during setting, facilitating easier flash removal.
• This color change aids in reducing plaque accumulation, promoting improved patient oral hygiene.

Purpose of the Study:

• To compare the shear bond strengths of different light-cure orthodontic bonding agents.
• Evaluated glass ionomer, conventional composite resin, and color-changing composite resin.
• Assessed bonding agents with conventional etch and self-etch primer methods.

Main Methods:

• Maxillary premolars (n=300) were bonded in five experimental groups.
• Shear bond strength testing was performed using an INSTRON machine.
• Statistical analysis included Kruskal-Wallis ANOVA and Mann-Whitney tests with Bon Ferroni adjustment.

Main Results:

• Light-cure conventional composite resin with conventional etchant exhibited the highest shear bond strength.
• Glass ionomer resin adhesive demonstrated the lowest shear bond strength.
• No significant difference was found between conventional composite with conventional etchant and color-changing composite with either etchant or self-etch primer.

Conclusions:

• Color-changing composites and self-etch primers are advantageous for patients with high DMFT scores or compromised hygiene.
• These materials are recommended for direct bonding in specific patient populations.
• The study concludes that color-changing materials are highly suitable for direct orthodontic bonding.