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A Journal on Dentistry and Maxillofacial Surgery
Minerva Stomatologica 2008 November-December;57(11-12):577-85
Changes in hardness and surface topography of tissue conditioners submitted to chemical disinfection
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.