Resumo

CASTRO, Milena de Fátima Schalcher de et al. Effect of chlorhexidine on the adhesion of glass ionomer cement used in atraumatic restorative treatments through microleakage test. RGO, Rev. gaúch. odontol. (Online) [online]. 2010, vol.58, n.2, pp. 167-171. ISSN 1981-8637.

OBJETIVE: The objective of this study was to assess in vitro how 2% chlorhexidine gel affects the adhesion of the glass ionomer indicated for atraumatic restorative treatments. The assessment was based on the microleakage test. METHODS: A total of 60 bovine incisive teeth were used, where sixty Class V cavities were prepared in the middle of the buccal surface. These teeth were randomly divided into 3 groups (n=20 each), and restored as follows: Group 1: control; Group 2: chlorhexidine administration followed by rinsing and restoration with the ionomer; Group 3: chlorhexidine administration followed by drying with cotton and restoration with the ionomer. Once the restorative procedures were done, the teeth were stored in a humidified holding cabinet at 37ºC for 30 days. After that, the teeth were waterproofed with nail polish and immersed in a 50% silver nitrate solution for 2 hours, rinsed, and finally immersed in a developing solution for 6 hours. They were then rinsed, cut horizontally in the middle of the restoration and the resulting 120 samples were analyzed with a stereo microscope with a magnification of 25X by three examiners, who gave the specimens scores from 0 to 4. RESULTS: The data were statistically analyzed by the non-parametric Kruskal-Wallis test. Significant differences were found among the studied groups (p<0.05). CONCLUSION: When chlorhexidine is administered under the ionomer glass and the cavity is not rinsed, significant infiltration occurs. When chlorhexidine is administered for 2 minutes with subsequent rinsing of the cavity, the result is similar to that to the control group. Nevertheless, microleakage occurred in all groups.

Palavras-chave : chlorhexidine; glass ionomer cements; dental leakage.