Related Experiment Videos
Effect of brushing on fluoride release from 3 bracket adhesives
Robert N Staley1, Steven J Mack, James S Wefel
1Department of Orthodontics, University of Iowa, Iowa City 52242, USA. robert-staley@uiowa.edu
Summary
Brushing with fluoride toothpaste significantly boosted fluoride release from orthodontic bracket adhesives and teeth. Resin-modified glass ionomer showed the highest sustained fluoride release over time.
Area of Science:
- Dental Materials Science
- Orthodontics
- Fluoride Chemistry
Background:
- Orthodontic treatment often involves bonding brackets to teeth using various adhesives.
- Fluoride-releasing materials are utilized in dentistry to enhance caries resistance.
- The interaction between dentifrices and orthodontic adhesives regarding fluoride release is not fully understood.
Purpose of the Study:
- To compare fluoride ion release from three orthodontic bracket adhesives: a light-cured composite resin, a fluoride-releasing composite resin, and a resin-modified glass ionomer.
- To evaluate the effect of brushing with a fluoridated dentifrice on fluoride ion release from these adhesives and from unbonded control teeth.
Main Methods:
- An in vitro study using 60 extracted human teeth, randomly assigned to six groups (three adhesive types with and without brushing, plus a control group that was brushed).
- Teeth were bonded, placed in deionized water, and subjected to brushing with a 1500 ppm fluoride toothpaste.
- Fluoride ion concentrations in the surrounding deionized water were measured at multiple time points for up to 93 days.
Main Results:
- Brushing significantly increased fluoride ion release from all tested composite resin and resin-modified glass ionomer adhesives, as well as from control teeth.
- Unbonded control teeth absorbed and re-released significant amounts of fluoride from the toothpaste.
- Brushed groups with fluoride-releasing composite resin and resin-modified glass ionomer showed significantly higher fluoride release in the later measurement periods compared to their non-brushed counterparts.
- Resin-modified glass ionomer groups consistently released significantly more fluoride than other groups, even at 90 and 93 days post-bonding.
Conclusions:
- Brushing with fluoridated toothpaste enhances fluoride release from orthodontic bracket adhesives and enamel.
- Fluoride-releasing orthodontic adhesives, particularly resin-modified glass ionomer, can contribute to sustained fluoride availability in the oral environment.
- The findings suggest a potential benefit of using fluoride-releasing adhesives in orthodontic patients to aid in caries prevention.