Related Experiment Video
Updated: Nov 23, 2025
Roughness Impact of Piezoelectric Dental Scaler on Two Distinct Flowable Composite Filling Materials
Published on: January 10, 2025
Surface roughness and chemical composition changes of resin-modified glass ionomer immersed in 0.2% sodium fluoride
Seung-Hwan Ong1, Seung-Hoon Yoo1
1Department of Pediatric Dentistry, College of Dentistry, Dankook University, Cheonan, Republic of Korea.
Background/Purpose:
Glass ionomers undergo degradation when exposed to fluoride, which changes the physico-chemical characteristics of the materials. The purpose of this study was to evaluate the surface changes of resin-modified glass ionomer (RMGI) when immersed in a sodium fluoride (NaF) solution according to pH and time.
Materials And Methods:
120 RMGI specimens were prepared, and 30 specimens were placed in four types of storage solutions for four weeks; pH 7 artificial saliva with or without 0.2% NaF (As7 and NaF7), pH 5 artificial saliva with or without 0.2% NaF (As5 and NaF5). Interferometry and microscopy were performed to evaluate the surface roughness and topography, while spectroscopy was used to analyze the chemical composition changes.
Results:
Rougher topography and increased roughness was exhibited in NaF groups, owing to the disintegration of the polysalt matrix. Reduced Sr and F was exhibited in all groups, whereas NaF group showed a decrease in Al and inorganic components.
Conclusion:
This study suggest that excessive use of fluoride therapy could lead to severe degradation of RMGI.
