The effect of powder/liquid ratio on microleakage of resin-modified glass-ionomer
Author(s):
Abstract:
Introduction
Resin modified glass-ionomer cement (RMGI) is prepared by manual mixing of powder and liquid. Different mixing ratios influence on the RMGI properties. The aim was to compare the effect of different mixing ratios on the microleakage of RMGI.Materials and Methods
In this in vitro study, 60 Class V cavities (3×2×1.5 mm) with the gingival margin of 1 mm apical to the cement-enamel junction were prepared on the buccal and lingual surfaces of 30 sound premolars. The teeth were randomly divided into 6 groups. Group 1: The manufacturers recommended ratio, without conditioning; Group2: The manufacturers recommended ratio with conditioning; Group 3: 20% lower than the manufacturers ratio without conditioning; Group4: 20% lower than the manufacturers ratio with conditioning; Group 5: 20% higher than the manufacturers ratio without conditioning; Group6: 20% higher than the manufacturers ratio with conditioning. After thermocycling, the microleakage was evaluated using silver nitrate staining. The teeth were cut into two mesial and distal halves, and the microleakage at occlusal and gingival margins was recorded based on a 0‒3 scoring system under a stereomicroscope. Data were analyzed using Kruskal-Wallis and Mann-Whitney tests with significance level at PResults
The maximum microleakage at gingival margins was recorded for group 4, which was significantly higher than that of group 2 and 6 (P=0.043 and P=0.043, respectively). No significant differences were observed in the microleakage between occlusal and gingival margins.Conclusion
A 20% reduction in P/L ratio of RMGI increases the gingival microleakage when surface conditioning was appli.Keywords:
Language:
English
Published:
Caspian Journal of Dental Research, Volume:6 Issue: 1, Mar 2017
Pages:
8 to 14
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