One-component self-etching primer: a seventh generation of orthodontic bonding system?

Area of Science:

• Orthodontics
• Dental Materials Science
• Adhesive Dentistry

Background:

• Conventional acid-etching requires a separate conditioning step.
• Self-etching adhesive systems offer a simplified bonding procedure.
• Evaluating new adhesive systems is crucial for improving orthodontic treatment efficiency.

Purpose of the Study:

• To compare the shear bond strength (SBS) of orthodontic brackets bonded with a new self-etching adhesive system (Xeno IV) versus a conventional acid-etching method.
• To evaluate the debonding site using the adhesive remnant index (ARI) for both systems.
• To assess the performance of Xeno IV with different composite materials.

Main Methods:

• 180 bovine lower incisors were divided into six groups.
• Groups 1-3 used Transbond XT composite with phosphoric acid, Xeno IV + primer, or Xeno IV only.
• Groups 4-6 used Fuji Ortho LC with no conditioning, phosphoric acid, or Xeno IV.
• Samples underwent thermocycling followed by SBS testing and ARI analysis.

Main Results:

• No statistical differences in SBS were found between groups using Transbond XT with phosphoric acid, Xeno IV + primer, or Xeno IV alone.
• Statistically significant differences in SBS were observed between the Transbond XT groups and the Fuji Ortho LC groups.
• Group 5 (Fuji Ortho LC + acid conditioning) showed the highest ARI score, while Group 4 (Fuji Ortho LC + no conditioning) had the lowest SBS.

Conclusions:

• Xeno IV self-etching adhesive provides comparable bond strengths to conventional acid-etching when used with Transbond XT composite.
• Xeno IV is effective in bonding orthodontic brackets with both Transbond XT composite and Fuji Ortho LC.
• The findings suggest Xeno IV offers a viable alternative for orthodontic bracket bonding, potentially simplifying the procedure.