Flowable composite an alternative orthodontic bonding adhesive: an in vitro study

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Orthodontic Adhesives

Background:

• BisGMA-based adhesives are widely used in orthodontics.
• Ormocer-based adhesives offer potential advantages in biocompatibility and handling.
• Evaluating novel adhesive formulations is crucial for improving clinical outcomes.

Purpose of the Study:

• To compare the clinical applicability of an Ormocer-based flowable adhesive (Admira fow) against a BisGMA-based adhesive (Transbond XT) and an Ormocer-based packable adhesive (Admira).
• To assess shear bond strength (SBS) and mode of bond failure for these orthodontic adhesives.

Main Methods:

• Sixty human premolars were bonded with metal brackets using Transbond XT, Admira, or Admira fow.
• Shear bond strength was evaluated using an Instron universal testing machine.
• The mode of bond failure was assessed using the modified ARI index and Kaplan-Meier survival analysis.

Main Results:

• Transbond XT exhibited the highest mean SBS, followed by Admira fow, and then Admira.
• While not statistically significant across all groups, a significant difference was noted between Transbond XT and Admira.
• All groups showed a cohesive type of bond failure (60-70%), and survival analysis indicated no statistically significant difference in median survival time.

Conclusions:

• Flowable Ormocer-based adhesives show promise as alternatives to conventional BisGMA-based adhesives.
• Admira fow demonstrates comparable bond strength and debonding properties, warranting further clinical investigation.
• The biocompatibility of Admira fow further supports its consideration as an alternative bonding system in orthodontics.