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:: Volume 6, Number 1 (March- 2017) ::
CJDR 2017, 6(1): 8-14 Back to browse issues page
The effect of powder/liquid ratio on microleakage of resin-modified glass-ionomer
Sepide Ostadi Joybari, Ghazaleh Ahmadizenouz, Soraya Khafri, Samane Qarehkhani *
Assistant Professor ,Dental Materials Research Center, Department Pedodontics, Faculty of Dentistry, Babol University of Medical Sciences , sgharekhani@gmail.com
Abstract:   (839 Views)

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 &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 manufacturer’s recommended ratio, without conditioning; Group2: The manufacturer’s recommended ratio with conditioning; Group 3: 20% lower than the manufacturer’s ratio without conditioning; Group4: 20% lower than the manufacturer’s ratio with conditioning; Group 5: 20% higher than the manufacturer’s ratio without conditioning; Group6: 20% higher than the manufacturer’s 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 P<0.05.

Results: 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: Dental leakages, Glass-ionomer cement, Dental cements
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Type of Study: Original Article | Subject: Operative Dentistry
* Corresponding Author Address: Babol,Iran.
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DOI: 10.22088/acadpub.BUMS.6.1.8


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Ostadi Joybari S, Ahmadizenouz G, Khafri S, Qarehkhani S. The effect of powder/liquid ratio on microleakage of resin-modified glass-ionomer . CJDR. 2017; 6 (1) :8-14
URL: http://cjdr.ir/article-1-195-en.html
Volume 6, Number 1 (March- 2017) Back to browse issues page
مجله تحقیقات دندانپزشکی کاسپین Caspian Journal of Dental Research
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