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Title: Latex and nonlatex orthodontic elastics: in vitro and in vivo evaluations of tissue compatibility and surface structure
Author: Martínez Colomer, Sara
Gatón Hernández, Patrícia
Romano, Fábio Lourenço
Rossi, Andiara De
Fukada, Sandra Yasuyo
Nelson Filho, Paulo
Consolaro, Alberto
Silva, Raquel Assed Bezerra da
Silva, Léa Assed Bezerra da
Keywords: Materials dentals
Gomes i resines
Microscòpia electrònica d'escombratge
Dental materials
Gums and resins
Scanning electron microscopy
Issue Date: 11-Jun-2015
Publisher: Allen Press Inc.
Abstract: Objective: to test the null hypothesis that there is no difference between latex and nonlatex orthodontic elastics with respect to tissue compatibility and surface structure. Materials and methods: latex and nonlatex elastics were implanted in the subcutaneous connective tissue of 45 Wistar rats. In the control groups, no material was implanted (sham). After 24 hours, 3, 7, 14, and 21 days, the animals were euthanized; tissue samples were processed and analyzed by descriptive and semi-quantitative microscopic analysis and quantification of plasma extravasation. The surface structure of elastics was evaluated by scanning electron microscopy (SEM). The results were analyzed by analysis of variance (ANOVA), Tukey test and Kruskal-Wallis test at 5% significance level. Results: peri-implant plasma extravasation was significantly higher (P < .05) in the animals that received latex elastics compared with those with nonlatex elastics and those that were control animals. The microscopic analysis revealed a more intense inflammatory infiltrate in the initial periods without statistically significant difference (P > .05) between the experimental and control groups. The SEM analysis revealed that the latex elastics presented microspheres and porosities, while the nonlatex elastics exhibited crystals on their surface and absence of porosities. Conclusion: the null hypothesis was rejected since the latex elastics were more irritating to the connective tissue than the nonlatex elastics in the initial periods and presented a more porous surface.
Note: Reproducció del document publicat a:
It is part of: The Angle Orthodontist, 2015, vol. 86, num. 2, p. 278-284
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ISSN: 0003-3219
Appears in Collections:Articles publicats en revistes (Odontostomatologia)

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