2015
Influence of Incorporating Sodium Fluoride on Flexural Strength, Water Absorption and Solubility of Adhesive Resin Cements
Jpn J Conserv Dent
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- Volume
- 58
- Number
- 1
- First page
- 10
- Last page
- 16
- Language
- Japanese
- Publishing type
- DOI
- 10.11471/shikahozon.58.10
- Publisher
- The Japanese Society of Conservative Dentistry
Purpose: By incorporating sodium fluoride in adhesive resin cement, the release of fluoride from the cement is expected to strengthen the teeth and prevent secondary caries. However, there is a concern that such fluoride incorporation and release could impair the physical properties of the cement. In this study, we investigated the influence of incorporating sodium fluoride on the flexural strength, water absorption and solubility of adhesive resin cement.<br> Materials and Methods: The experimental resin cements were prepared at concentrations of 0-20 wt% sodium fluoride. The amounts of fluoride released from the cements were measured from day 1 to day 84. Next, a three-point bending test of the experimental resin cements was performed after initial curing (24 hours storage in water at 37°C) and after thermal cycle loading (5°C-55°C, 10,000 times). Furthermore, water absorption and solubility following 30 days immersion in water were measured.<br> Results: Fluoride release increased with an increase in the content rate of sodium fluoride. After initial curing, the three-point bending strengths of 5 wt% and 10 wt% sodium fluoride compounded cement were not statistically decreased compared to those of sodium fluoride 0 wt%, but were significantly reduced by incorporation of more than 15 wt%. There were no significant differences in the strength between 15 wt% sodium fluoride compounded cement and 20 wt% sodium fluoride compounded cement. Similar results were also observed in the comparison of flexural strength after thermal cycle loading. Regarding the 30-day water absorption amount, there was no significant difference between 5 wt% sodium fluoride compounded cement and that of 0 wt% sodium fluoride cement. However, the 30-day water absorption of 10 wt% sodium fluoride compounded cement was significantly increased compared to that of 0 wt% sodium fluoride compounded cement. The solubility was not significantly different between the content rate of 0-10 wt% sodium fluoride.<br> Conclusion: Increasing the sodium fluoride content improved the amount of fluoride release. On the other hand, the flexural strength of the cement was decreased, and the amounts of water absorption and solubility were increased. Within the limit of this study, it is suggested that 10 wt% sodium fluoride compounded cement could provide fluoride release without decreasing mechanical strength.
- Link information
- ID information
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- DOI : 10.11471/shikahozon.58.10
- ISSN : 0387-2343
- CiNii Articles ID : 130005005978