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Fluoride release from new light-cured orthodontic bonding agents.
C J McNeill1, W A Wiltshire, C Dawes
1Section of Orthodontics, University of Manitoba, Winnipeg, Manitoba, Canada.
Summary
This study compared fluoride release from orthodontic bonding materials over six months. All tested fluoride-releasing materials showed potential to inhibit enamel decalcification.
Area of Science:
- Orthodontic Materials Science
- Dental Biomaterials
- Fluoride Chemistry
Background:
- Orthodontic bonding materials are crucial for bracket adhesion.
- Understanding fluoride release is vital for assessing anticariogenic potential.
- Previous research indicates varying fluoride release profiles among different materials.
Purpose of the Study:
- To quantify and compare fluoride ion release over time from four orthodontic bonding materials.
- To evaluate the influence of storage medium (distilled water vs. artificial saliva) on fluoride release.
- To determine if fluoride release rates are sufficient to inhibit enamel demineralization.
Main Methods:
- Four orthodontic bonding materials (Assure, Fuji Ortho LC, Python, Transbond XT) were tested.
- Specimens were stored in distilled water and artificial saliva at 37°C for six months.
- Fluoride release was measured using an ion-specific electrode at periodic intervals.
- A secondary test assessed fluoride release from Assure after one year of storage.
Main Results:
- Initial fluoride release was highest for Assure, followed by Fuji Ortho LC, Python, and Transbond XT.
- Fluoride release rates decreased over time but remained stable.
- After six months, Fuji Ortho LC showed the highest cumulative release, followed by Assure, Python, and Transbond XT.
- Storage medium did not significantly impact fluoride release.
- Fluoride release from Assure remained above the inhibitory level for enamel decalcification even after prolonged storage.
Conclusions:
- All three fluoride-containing orthodontic bonding materials demonstrated fluoride release rates theoretically capable of inhibiting enamel decalcification.
- Fuji Ortho LC and Assure exhibited higher fluoride release compared to Python and Transbond XT over the six-month period.
- The storage medium had a minimal effect on fluoride release rates.
- Continued fluoride release suggests a sustained anticariogenic benefit from these materials.