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Journal of Applied Oral Science

Print version ISSN 1678-7757On-line version ISSN 1678-7765


MORAES, Ivaldo Gomes de; MORAES, Fernanda Gomes de; MORI, Graziela Garrido  and  GONCALVES, Silvana Beltrami. Influence of calcium hydroxide on dyes for dentin labeling, anlyzed by means of a new methodology. J. Appl. Oral Sci. [online]. 2005, vol.13, n.3, pp.218-221. ISSN 1678-7757.

The objective of this study was to evaluate the influence of calcium hydroxide in intracanal dressing on the ability of the dyes rhodamine B and methylene blue to label the dentine. Forty extracted human mandibular premolars had their canals instrumented and were divided into four groups: in two groups, the canals were filled with a calcium hydroxide paste and the others remained in distilled water. After 15 days, in two groups (with and without dressing), the canals were obturated with sealer containing methylene blue, whereas the others contained rhodamine B. For analysis, the roots were transversally sectioned in their cervical, medium and apical thirds, and the labeling was analyzed. The Mann-Whitney test showed statistically significant difference between the dressing/methylene blue group and the others. Based on these results, it was concluded that calcium hydroxide in intracanal dressing negatively interferes with the labeling ability of methylene blue.

Keywords : Methylene blue; Rhodamine B; Dental leakage; Root canal filling materials.

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