Objective:
To establish a material which demonstrates long-term sustained fluoride release. The cement will prevent demineralisation during orthodontic treatment. Dental stone (Dentstone KD, BPB Formula, Nottinghamshire, UK), Dental plaster (Dental Plaster BPB Formula, Nottinghamshire, UK) and Portland cement(name manufacturer) were investigated as a vehicle for fluoride delivery. Glass ionomer cement (Ketac Cem, 3MESPE, Seefeld, Germany) and composite (Transbond XT, 3M, Monrovia CA) as controls.
Methods:
3 discs,10mm x 3mm of each of the 5 material were prepared, each with either
0,1, 5, 15% additional NaF; Discs were stored in 5mL of de-ionised water and fluoride release measured daily for 7 days and weekly for 11 weeks using an ion-selective electrode.
Results:
| Material | NaF Added | Fluoride Release (ppm) | ||
|
|
| Day 1 | Day 7 | Week 11 |
| Dental Stone | 0% | 0.71 | 0.14 | 0.04 |
|
| 1% | 4.87 | 3.33 | 3.13 |
|
| 5% | 6.21 | 3.74 | 3.31 |
|
| 15% | 8.35 | * | * |
| Dental Plaster | 0% | 0.06 | 0.04 | 0.04 |
|
| 1% | 0.43 | 0.22 | 0.33 |
|
| 5% | 6.99 | 1.13 | 1.54 |
|
| 15% | 32.68 | 2.70 | 2.19 |
| Portland Cement | 0% | 0.02 | 0.01 | 0.00 |
|
| 1% | 1.61 | 3.11 | 2.75 |
|
| 5% | 1.73 | 2.99 | 3.25 |
|
| 15% | 3.18 | 4.56 | * |
| Composite | 0% | 0.36 | 0.05 | 0.07 |
|
| 15% | 64.88 | 2.32 | 2.51 |
| Glass Ionomer | 0% | 0.59 | 0.26 | 0.99 |
|
| 1% | 32.69 | 3.47 | 3.49 |
|
| 5% | 32.35 | 3.28 | 1.52 |
|
| 15% | * | * | * |
* = specimen disintegrated, no data available.
Dental stone plus 1% and 5% NaF and dental plaster plus 1% and 5% NaF showed sustained fluoride release compared with Portland cement. Composite and GIC plus 15% and 5% NaF release more fluoride intitially but the release deteriorates after 7 days.
Conclusions:
Dental plaster and dental stone with added fluoride may be useful vehicles for sustained fluoride delivery. Glass ionomer cement and composite with high levels of fluoride added also show significant fluoride release over 11 weeks.