engleski

The influence of ultrasonic excitation and heat application on the microleakage of glass ionomer cements

Objectives. The aim of this study was to assess the influence of externally applied ‘command set’ methods on the microleakage of several glass- ionomer cements (GIC). Methods. Four different restorative GICs were cured using three different methods: For Review Only standard curing (SC), ultrasonic excitation (UC) and by an external heat source (HC). Different conditioning agents (10% polyacrylic and 10% citric acid) were used. Sample comprised 180 teeth with 360 class V restorations placed on lingual and vestibular tooth surface. After thermocycling the teeth were immersed in a dye solution for 24 h, embedded in acrylic resin, sectioned and evaluated. Oberholtzer criteria were used for evaluation of margins. Data were analyzed using three-way ANOVA. Results. The heat-cured GIC showed statistically significant better marginal adaptation than the other tested groups (SC, UC) (p<0.001). GICs in groups with HC and conditioned cavities showed lower score of microleakage. The highly viscous material Fuji IX GP Fast in HC and conditioned cavities group demonstrated the best marginal adaptation. The other three products behaved very similarly on heating treatment. Leakage at the enamel margins was significantly lower than cementum/dentin margins (p<0.001). Conclusion. Heating of GIC decrease microleakage, improves marginal adaptation of GIC restoration and can be used in clinical practice.

glass ionomer; heat curing; microleakage; ultrasonic curing

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