Tissue reaction to orthodontic adhesives

Area of Science:

• Dental Materials Science
• Toxicology
• Biocompatibility Testing

Background:

• Direct bonding materials are widely used in dentistry.
• Reports of adverse reactions to dental adhesives prompted toxicity evaluations.
• Understanding adhesive biocompatibility is crucial for patient safety.

Purpose of the Study:

• To assess the toxicity of six dental adhesives in an animal model.
• To identify specific adhesive components responsible for adverse reactions.
• To inform clinicians about potential risks associated with dental adhesives.

Main Methods:

• Thirty-nine hamsters were used to test skin, oral mucosa, and gingival responses.
• Adhesive components and polymerized adhesives were applied topically.
• Gross and histological examinations evaluated toxic responses.

Main Results:

• One adhesive's monomer component induced significant gross irritation and histological inflammation (p < 0.001).
• Other tested adhesives and components did not elicit similar adverse effects.
• The problematic adhesive was modified, and the new product showed no similar adverse reactions.

Conclusions:

• Dental adhesives can exhibit toxic potential, necessitating careful clinical observation.
• Clinicians must be prepared to switch materials if adverse reactions occur.
• Negative results in animal models do not entirely preclude clinical adverse events.