Orthodontic composite resin bond strength with conventional light and Power Slot curing

Area of Science:

• Orthodontics
• Dental Materials Science
• Biomaterials

Background:

• Direct bonding of orthodontic brackets is crucial for treatment efficacy.
• Light curing systems significantly influence the bond strength and longevity of composite resins used in bracket adhesion.
• Evaluating novel light curing technologies is essential for improving clinical outcomes in orthodontics.

Purpose of the Study:

• To compare the clinical performance of a new composite resin using a conventional versus a turbo-boosted light curing system for direct bonding of orthodontic brackets.
• To assess the failure rates and locations associated with each light curing system in a split-mouth clinical trial.

Main Methods:

• A split-mouth design clinical trial involving 50 patients (32 female, 18 male) over a mean of 12 months.
• 1200 stainless steel brackets were bonded: 600 with conventional light curing (20s per bracket) and 600 with a new Power Slot system (6s per bracket).
• Bracket debonding and failure modes were evaluated on permanent and deciduous teeth.

Main Results:

• The Power Slot light curing system exhibited a significantly lower failure rate (2.3%) compared to the conventional system (4.3%) (p<0.0360).
• No significant differences in failure rates were observed between upper and lower arches or anterior and posterior areas for either system.
• A higher failure rate was noted in the upper arch compared to the lower arch when using the conventional light curing system (p<0.0269).

Conclusions:

• The Power Slot light curing system proved more effective in bonding orthodontic brackets, resulting in fewer failures.
• The primary mode of failure for both systems was at the enamel-adhesive interface.
• Neither light curing system caused significant damage to the enamel upon bracket debonding.