In vitro study of resin-modified glass ionomer cements for cementation of orthodontic bands

1999 ◽  
Vol 60 (5) ◽  
pp. 348-360 ◽  
Author(s):  
Saskia M. Liebmann ◽  
Paul-Georg Jost-Brinkmann
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer

scholarly journals Comparative evaluation of microleakage of nano-filled resin-modified glass ionomer: An in vitro study

2014 ◽  
Vol 08 (04) ◽  
pp. 450-455 ◽  
Author(s):  
Nesrin Eronat ◽  
Emir Yilmaz ◽  
Nazan Kara ◽  
Asli Topaloglu Ak
Keyword(s):  
Third Molar ◽  
In Vitro Study ◽  
High Viscosity ◽  
Vitro Study ◽  
Glass Ionomer ◽  
Class V ◽  
Dye Penetration ◽  
Resin Modified Glass Ionomer ◽  
Group B

ABSTRACT Objective: This in vitro study evaluated the microleakage of a nano-filled resin-modified glass ionomer and a high viscosity glass-ionomer restorations in class V cavities. Materials and Methods: Thirty-two class V cavities prepared on the buccal and lingual surfaces of 16 sound, third molar teeth were randomly assigned into two groups and restored by one of the glass ionomer material; Group A: A high viscosity (Ketac Molar, 3M ESPE) Group B: A nano-filled resin-modified (Ketac N100, 3M ESPE) glass ionomer. One clinician prepared all the cavities. The materials were used according to the manufacturers’ recommendations. The restored teeth were then stored in distilled water at 37°C for 24 h, thermocycled at 5-55°C for 1000 cycles. The specimens were immersed in aqueous solution of Indian ink dye for 48 h at room temperature. They were embedded in resin polyester and sectioned longitudinally in a buccolingual direction. Microleakage was assessed according to the depth of dye penetration along the restoration. The extent of dye penetration at the occlusal and gingival margins was assessed using a stereo microscope. Randomly selected samples from each group were prepared for scanning electron microscope evaluation. The data were statistically analyzed with Friedman and Wilcoxon signed ranks tests. Results: There were statistically significant differences between the microleakage scores of the two groups for both occlusal and gingival scores (P = 0.001). Occlusal and gingival scores for high viscosity glass ionomer (P = 0.024) and nanoionomer (P = 0.021) using Wilcoxon signed ranks tests showed statistically significant differences. High viscosity glass ionomer showed significantly less microleakage compared to the nano-filled resin-modified glass-ionomer (RMGIs) at occlusal margin (P = 0.001). No significant differences were found between the groups at gingival margin (P = 0.0317). Conclusion: Within the limitations of this in vitro study, nano-filled RMGIs restorations did not perform better than high viscosity glass ionomer in class V cavities in terms of microleakage assessment.

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