Effect of pH on the wettability and fluoride release of an ion-releasing resin composite

• Published in: Operative dentistry Vol. 33; no. 5; pp. 571 - 578
• Main Authors: Namen, Fátima M, Galan, Jr, João, De Deus, Gustavo, Cabreira, Rodrigo Derossi, Filho, Fernando Costa e Silva
• Format: Journal Article
• Language: English
• Published: United States 01-09-2008
• Subjects: Cariostatic Agents - chemistry; Composite Resins - chemistry; Dental Materials - chemistry; Dental Polishing; Dentistry; Fluorides - chemistry; Glycerol - chemistry; Humans; Hydrogen-Ion Concentration; Ion-Selective Electrodes; Lactic Acid - chemistry; Materials Testing; Methacrylates - chemistry; Polymers - chemistry; Surface Properties; Water - chemistry; Wettability
• ISSN: 0361-7734; 1559-2863
• DOI: 10.2341/07-147

The current study evaluated the effect of pH on the wettability and fluoride release of an ion-releasing resin composite. The contact angles and fluoride release related to both finished and non-finished surfaces were evaluated. The specimens were polymerized and either submitted to finishing procedures or left unfinished, then stored for seven days at pH levels of 5.0, 5.5 and 6.8. Contact angles were measured with two different liquids (water and glycerol) and the fluoride release of the solution was determined. The results were statistically examined by one-way ANOVA and Bonferroni test at p < 0.05. The data showed that there were statistically significant differences in contact angles between the finished and unfinished ion releasing resin composites, except at pH 5.0, when measured with water. The highest contact angles were found at pH 6.8, mainly in the unfinished group. The fluoride release showed the highest values in the finished group at pH levels of 5.0 and 5.5 and in the unfinished group at pH 5.5.