Journal article
Effects of different radiation doses on the microhardness, superficial morphology, and mineral components of human enamel
Archives of oral biology, Vol.80, pp.130-135
08/01/2017
DOI: 10.1016/j.archoralbio.2017.04.007
PMID: 28414987
Abstract
Objective: To evaluate the effects of three different radiotherapy doses (20, 40, and 70 Gy) 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 50 g for 30 s. 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 0.1 M 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.
Details
- Title: Subtitle
- Effects of different radiation doses on the microhardness, superficial morphology, and mineral components of human enamel
- Creators
- Sandra Ribeiro de Barros da Cunha - Universidade de São PauloFelipe Paiva Fonseca - Universidade Federal de Minas GeraisPedro Augusto Minorin Mendes Ramos - Hosp Sirio Libanes, Dept Med Physicist, Rua Dona Adma Jafet 91, Sao Paulo, SP, BrazilCecilia Maria Kalil Haddad - Hosp Sirio Libanes, Dept Med Physicist, Rua Dona Adma Jafet 91, Sao Paulo, SP, BrazilEduardo Rodrigues Fregnani - Hospital Sírio-LibanêsAna Cecilia Correa Aranha - Universidade de São Paulo
- Resource Type
- Journal article
- Publication Details
- Archives of oral biology, Vol.80, pp.130-135
- DOI
- 10.1016/j.archoralbio.2017.04.007
- PMID
- 28414987
- NLM abbreviation
- Arch Oral Biol
- ISSN
- 0003-9969
- eISSN
- 1879-1506
- Publisher
- Elsevier
- Number of pages
- 6
- Grant note
- Sirio-Libanes Hospital School of Dentistry of the University of Sao Paulo
- Language
- English
- Date published
- 08/01/2017
- Academic Unit
- Operative Dentistry
- Record Identifier
- 9984696852002771
Metrics
6 Record Views