RESUMO
A three year clinical and laboratory evaluation of class I and H highly viscous glass ionomer restorations was conducted. Medifil IX glass ionomer capsules were used. The clinical evaluation included testing vitality, retention, structural integrity, anatomic form, secondary caries, marginal adaptation. interfacial staining, sensitivity, surface smoothness, surface staining, and patients satisfaction. The laboratory study included a three year leakage study for class I and M cavities using rhodamyne red dye to assess leakage at the axial and gingival margins using the Stereo Micro-scope. The cut specimens were later examined under the TSM [Conofocal Microscope]. The axial and gingival dap distances were also measured using the stereomicroscope and image analysis system. The clinical study revealed a 92% success rate after three years for class I restorations and a 79% success rate for class II restorations. For class I and classll cavities leakage scores were maximum at 24 hours, minimal at one year and increased more at two and again at three years. Gingival maiUnal gap distances were statistically lower than the axial gaps. There was no significant differences in axial and gingival gap distances between the different time intervals. It was concluded that such a material performed satisfactorily for three years in class I cavities. In class II cavities, whenever a heavy load is anticipated its use should be limited to two years only