Avaliação dos efeitos da desinfecção química e com radiação ultravioleta na estabilidade dimensional de diferentes materiais de moldagem odontológicos
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Data
2021
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Universidade Brasil
Resumo
The disinfection of molds obtained with dental impression materials is within the
biosafety protocols, in the control of cross-infection of microorganisms in dental offices,
prosthesis laboratories, professionals and patients, being currently the target of greater
attention due to the pandemic of COVID-19, with the implementation of alternative
disinfection protocols and methods. The purpose of this study was to compare the
effects of disinfection by ultraviolet radiation and chemical disinfection on dimensional
stability of different dental molding materials. Acrylic resin mannequin molds with
irreversible hydrocolloidal materials (alginate) (n = 25) and elastomer (condensation
silicone) (n = 25) were used with different disinfection methods (n = 5): G1- negative
control: no treatment, G2- Glutaraldehyde 2% (10 min), G3- Sodium hypochlorite 1%
(10 min), G4- UV-C radiation (λ = 254 nm) (30 s), G5- Autoclave (positive control) (15
min). The molds after the treatments were cast with special plaster. After 24 h, the
plaster models were measured by a calibrated, blinded researcher, with a caliper in
determined places on the upper first molar: mesio-distal (MD-O) and vestibulo-lingual
(VL-O) and buccal cervical-occlusal face (CV-B) and mesio-distal (MD-V). The data
were tabulated and analyzed using the statistical tests of Kolmogorov-Smirnov, ANOVA
one-way and Tukey tests (p <0.05). There were no statistically significant differences
in the linear values of plaster models between chemical (Glutaraldehyde 2%, sodium
hypochlorite 1%) and physical (UV-C radiation) disinfection methods with the control
(p> 0.05), the autoclave showed a significant difference in relation to the control and
the different methods of disinfection (p <0.05) with greater dimensional change for both
impression materials. It can be concluded that the methods of chemical disinfection
(Glutaraldehyde 2%, Sodium hypochlorite 1%) and physical (UV-C radiation)
maintained the dimensional stability of the dental impression materials alginate and
elastomer (condensation silicone).
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Palavras-chave
Alginato, Bioengenharia, Desinfecção, Elastômeros, Radiação ultravioleta