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http://hdl.handle.net/1843/58998| Type: | Artigo de Periódico |
| Title: | Effects of different radiation doses on the microhardness, superficial morphology, and mineral components of human enamel |
| Authors: | Sandra Ribeiro de Barros da Cunha Felipe Paiva Fonseca Pedro Augusto Minorin Mendes Ramos Cecília Maria Kalil Haddad Eduardo Rodrigues Fregnani Ana Cecília Corrêa Aranha |
| Abstract: | Objective: To evaluate the effects of three different radiotherapy doses (20, 40, and 70Gy) on the microhardness, superficial morphology, and mineral content (based on Ca and P values) of three different depths of human enamel (cervical, middle, and occlusal). Design: Thirty-four third molars were cut, separated, and prepared. Microhardness samples (n=30) were embedded in acrylic resin and then polished, and depths were delimited. Microhardness tests were performed on cervical, middle, and occlusal enamel pre- and post-radiotherapy with a load of 50g for 30s. For the scanning electron microscopy (SEM) analysis (n=4) and energy dispersive X-ray spectroscopy (EDS) (n=12), samples were fixed in a 3% glutaraldehyde solution, washed in 0.1M cacodylate solution, and dehydrated in crescent concentrations of ethanol. Microhardness data were tested for significant differences using a two-way analysis of variance (ANOVA) and Tukey's test (p<0.05), while SEM and EDS were evaluated qualitatively. Results: The results showed a decrease in microhardness values only in the cervical enamel, regardless of the radiation dose used; no morphological or mineral change was observed. Conclusion: Radiotherapy can affect the microhardness values of only cervical enamel without compromising the morphological or mineral (Ca and P) content at any depth. |
| Subject: | Radiotherapy Spectrometry, X-Ray emission Dental enamel Head and neck neoplasms Hardness Minerals Microscopy, electron, scanning |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | FAO - DEPARTAMENTO DE CLÍNICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1016/j.archoralbio.2017.04.007 |
| URI: | http://hdl.handle.net/1843/58998 |
| Issue Date: | Aug-2017 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0003996917301176?via%3Dihub |
| metadata.dc.relation.ispartof: | Archives of Oral Biology |
| Appears in Collections: | Artigo de Periódico |
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