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AbstractAbstract
[en] The treatment of head and neck cancer is associated with a series of oral toxicities. In this context, recent clinical evidence demonstrated that head and neck radiotherapy causes changes in the microvasculature and innervation. However, such changes have not been demonstrated by morphological studies of the pulp tissue derived from cancer patients. Therefore, this essay aimed to investigate direct effects of radiation on the microvasculature, innervation and extracellular matrix of the pulp from patients with head and neck cancer who underwent radiotherapy. Forty samples of human dental pulp were used and were divided into two groups. In the irradiated group, 23 samples from patients who concluded head and neck radiotherapy were used. The control group was composed with 17 pulp samples obtained from patients without previous history of radiotherapy. Samples from both groups were histologically processed and stained with hematoxylin and eosin for a morphological evaluation of the microvasculature, innervation and extracellular matrix of the pulps. Subsequently, an immunohistochemical (IHC) analysis of proteins related to vascularisation (CD-34 and smooth muscle actin), innervation (S-100, NCAM/CD56 and neurofilament) and extracellular matrix (vimentin) of the pulps was performed. The morphological study identified the presence and preservation of the microvasculature, nerve bundles and extracellular matrix of all studied samples. The IHC analysis confirmed the morphological findings and demonstrated a preserved expression for the studied markers in all samples. In conclusion, direct effects of radiotherapy are not able to generate morphological changes in the microvasculature, innervation or extracellular matrix of the dental pulp from patients with head and neck cancer. (author)
Original Title
Avaliação dos efeitos diretos da radioterapia sobre a microvascularização, a inervação e a matriz extracelular da polpa dental de pacientes oncológicos
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Source
2013; 89 p; Diss. (M.Sc.)
Record Type
Miscellaneous
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Thesis/Dissertation
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