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Online ISSN 1827-174X
Cunegatti Zottis A. 1, Caldas Cosme D. 1, Brasiliense Elsemann R. 2, Mitsuo Silva Oshima H. 1, Arai Shinkai R. S. 1
1 Pontificial Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
2 University of Santa Cruz Santa Cruz do Sul, RS, Brazil
Aim. The aim of this study was to evaluate the longitudinal effect of chemical disinfection on Shore A hardness, surface roughness (Ra) and morphology of two tissue conditioners (Dura Conditioner® [DC] and Softone® [SO]).
Methods. Twenty-four specimens (2 mm-thick) were made of each material and randomly divided into three groups (N.=8): control (no disinfection), 10 000 ppm chloride solution (sodium hypochlorite) and Corega Tabs® solution (peroxide solution). Soaking was performed daily for 15 min, and Shore A hardness and Ra were measured at baseline and 3, 7, 10, and 14 days. Data were analyzed by repeated measures ANOVA and Bonferroni’s test (a= 0.05).
Results. Chemical disinfection for 14 days with sodium hypochlorite and Corega Tabs affected differently the tested materials. Hardness varied from 8 to 20 for DC and from 8 to 23 for SO with significant interaction (P<0.05) between material and disinfection treatment up to day 7. Ra values (in µm) varied from 1.51 to 4.35 for DC and from 2.08 to 4.15 for SO; there was a significant difference between disinfection treatments (P=0.043) but not between materials (P=0.119). Sodium hypochlorite groups displayed smaller Ra values than the control groups, but did not differ from Corega Tabs® groups. Scanning electron microscopy showed different pattern of degradation for each material.
Conclusion. The results suggest that the effect of chemical disinfection on degradation of tissue conditioners is material-specific, but hardness is less affected than surface topography. The overall results support the use of the tested materials for up to three days, independently from the disinfection treatment.