835 Four Week Fluoride Release of Various Dental Materials

Friday, March 23, 2012: 2 p.m. - 3:15 p.m.
Presentation Type: Poster Session
M. OGLEDZKI, C. DECOTEAU, M. FINKELMAN, G. KUGEL, and R.D. PERRY, Tufts University, Boston, MA

Objectives: Fluoride is known to inhibit caries progression and is commonly added to dental restorative materials to leach out into the oral environment. The goal of this study was to compare the fluoride ion release by four dental materials in Table 1, over the course of 4 weeks.

Methods: Stainless-steel mold was used to prepare 3 cylindrical samples of each material measuring 6mm in height by 4mm in diameter, for a total of 12 samples. Samples were light-cured for 1min on 3 sides and placed into 5ml de-ionized water bath and stored at 37C. During 4weeks, 15 measurements were taken using Thermo-Orion Model 250A pH-meter. Prior to sample measurements, meter was calibrated using blank solution of de-ionized water and 6 standard solution measurements were taken with fluoride concentrations ranging from 4199ppm to 0.04199ppm. Samples were removed from water bath and placed into new vials containing 5ml of de-ionized water and stored at 37C. Water bath was measured for fluoride ions and discarded. Immediately prior to all readings, 0.5ml of TISAB solution was added. After 30days, dimensional measurements were taken and fluoride release was calculated per surface area. One-way ANOVA and Tukey's HSD tests were used to analyze results.

Results: One-way ANOVA showed that a statistically significant difference (p<0.001) exists between products during each of the 4 weeks.

Table-1. Average weekly fluoride release and cumulative fluoride release after 4 weeks in mm/mm.

Product

Week-1

Week-2

Week 3

Week-4

4-Week Cumulative

Riva Bond LC (RB)

4.0662a

0.9153a

0.6644b

0.4934b

6.1393a, b

Vitrebond Plus (VP)

3.2468b

0.9583a

0.7113b

0.5425b

5.4589b

Fuji Bond LC (FB)

3.9766 a

0.9967a

0.7996a

0.6212a

6.3942a,

Optibond Solo Plus (OS)

2.5259c

0.4498b

0.2317c

0.1481c

3.3554c

a,b,c Indicate ranking of materials based on significant differences (p<0.05) in fluoride release

Conclusions: Highest fluoride release occurred during the first week. Weekly fluoride release decreased for all materials. After 2 weeks, FB maintained the highest weekly fluoride release. During 4 weeks, FB and RB showed the highest cumulative fluoride release. OS showed the lowest fluoride release at all times.

This abstract is based on research that was funded entirely or partially by an outside source: SDI

Keywords: Caries, Dental materials, Evaluation, Fluoride and Teeth