Orthodontic Bond Strength Comparison between Two Filled Resin Sealants

Area of Science:

• Dental Materials Science
• Orthodontic Adhesion

Background:

• Orthodontic sealants are crucial for preventing demineralization during orthodontic treatment.
• Understanding the shear bond strength (SBS) of different sealants is vital for effective clinical application.

Purpose of the Study:

• To compare the shear bond strength (SBS) of two resin sealants (L.E.D. Pro Seal and Opal Seal) against a control primer (Transbond XT Primer).

Main Methods:

• Extracted human premolars were randomly assigned to three groups: Transbond XT Primer (control), L.E.D. Pro Seal, and Opal Seal.
• Following acid etching, primers/sealants were applied, followed by bracket bonding with Transbond XT Adhesive.
• Shear bond strength (SBS) was measured after 48 hours of storage in distilled water at 37°C.

Main Results:

• Transbond XT Primer exhibited significantly higher SBS (20.1 MPa) compared to Opal Seal (15.7 MPa).
• L.E.D. Pro Seal (16.5 MPa) and Opal Seal showed comparable SBS, with no significant difference between them.
• The Opal Seal group demonstrated higher adhesive remnant index (ARI) scores, indicating more adhesive left on teeth post-debonding.

Conclusions:

• Opal Seal and L.E.D. Pro Seal demonstrate similar, lower shear bond strengths compared to the Transbond XT Primer.
• These findings suggest that while these sealants offer protection, their adhesive performance may be less robust than traditional primers.