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Dive into the research topics where Maria Emília Santos Pereira Ramos is active.

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Featured researches published by Maria Emília Santos Pereira Ramos.


Oral Surgery Oral Medicine Oral Pathology Oral Radiology and Endodontology | 2008

Evaluation of mutagenic effects of formocresol: detection of DNA-protein cross-links and micronucleus in mouse bone marrow.

Maria Emília Santos Pereira Ramos; Bruno C. Cavalcanti; Letícia Veras Costa Lotufo; Manoel Odorico de Moraes; Eneida de Moraes Marcílio Cerqueira; Cláudia Pessoa

OBJECTIVE The genotoxic potential of formocresol was assessed by comet assay on human peripheral blood lymphocytes and in vivo micronucleus in mice. STUDY DESIGN Peripheral blood lymphocytes, obtained from healthy donors, were exposed directly with different dilutions of formocresol for 45 minutes at 37 degrees C. To verify the possibility of formocresol to induce DNA-protein cross-links, treated lymphocytes were incubated with proteinase K. Micronucleus test was performed on male Swiss mice treated with several dilutions of formocresol by single intraperitoneal injection. After treatment, bone marrow was sampled 24 and 48 hours after formocresol administration. RESULTS Formocresol did not produce detectable DNA damage as evaluated by comet assay. However, after proteinase K exposure, a dose-dependent increase of DNA migration was observed. Formocresol induced a significant increase in micronucleus frequencies at the highest dilution only at 24 hours after administration. CONCLUSION Formocresol induced DNA-protein cross-links and an increased frequency of micronucleus.


Mutagenesis | 2016

Evaluation of the genotoxicity and cytotoxicity of filling pastes used for pulp therapy on deciduous teeth using the micronucleus test on bone marrow from mice (Mus musculus)

Nilton C. N. Santos; Maria Emília Santos Pereira Ramos; Aline F. B. Ramos; Adriana B. Cerqueira; Eneida de Moraes Marcílio Cerqueira

Pulp therapy is the last resort for preserving deciduous teeth. However, the genotoxic and cytotoxic effects of many products used in this therapy are not well established. The aim of this study was to use the micronucleus test on bone marrow from mice to evaluate the genotoxic and cytotoxic effects of four filling pastes: zinc oxide, calcium hydroxide P.A., mineral trioxide aggregate and an iodoform paste (iodoform + camphorated + paramonochlorophenol + rifamycin + prednisolone). Male Swiss mice were divided into 4 groups of 10 animals, each exposed to one of the pastes, and were subdivided according to the dilutions tested: 1/10, 1/50, 1/500 and 1/1000 administered intraperitoneally (0.1ml/10g of weight). Cyclophosphamide was the positive control. The negative controls were dimethylsulfoxide and buffered saline solution. Five animals were killed 24h and five 48h after the treatment. The material was processed in accordance with Schmid (1976) and micronuclei were counted in 1000 polychromatic erythrocytes (PCE), under an optical microscope in a blinded test. Cytotoxicity was evaluated using the PCE/normochromatic erythrocyte (NCE) ratio in 200 erythrocytes. The micronucleus analysis results were evaluated using the conditional test for comparing proportions in situations of rare events. Analysis of variance and Tukeys test were used to evaluate the PCE/NCE ratio. There was significantly greater occurrence of micronuclei in the animals treated with iodoform paste at all the dilutions tested, at both sacrifice times. Greater occurrence of micronuclei was observed among the animals treated with zinc oxide and sacrificed 48h after the treatment, at the dilutions 1:50; 1:500 and 1:1000. Calcium hydroxide P.A. and mineral trioxide aggregate did not present any genotoxic or cytotoxic effects. The genotoxicity and cytotoxicity of zinc oxide and iodoform paste revealed here constitute an initial step towards their contraindication, but additional studies will be necessary in order to securely establish the risks involved in their use.


Rev. ABO nac | 2004

Fibroma ossificante periférico: relato de um caso clínico

Tarsila Morais de Carvalho Freitas; Jener Gonçalves de Farias; Valéria Souza Freitas; Maria Emília Santos Pereira Ramos; Ruy Paschoal Ramos Júnior


Oral Surgery, Oral Medicine, Oral Pathology, and Oral Radiology | 2018

Prevalence of Central Maxillary Lesions in a Referral Center

Tarsila De Carvalho Freitas Ramos; Hemilly Karol Andrade dos Santos; Antonio Varela Cancio; Valéria Souza Freitas; Maria Emília Santos Pereira Ramos; Márcio Campos Oliveira; Jener Gonçalves de Farias


Oral Surgery, Oral Medicine, Oral Pathology, and Oral Radiology | 2018

Oral Paracoccidioidomycosis Mimicking Squamous Cell Carcinoma: A Case Report

Tarsila De Carvalho Freitas Ramos; Lorena De Araújo Almeida; Jener Gonçalves de Farias; Antonio Varela Cancio; Maria Emília Santos Pereira Ramos; Valéria Souza Freitas; Márcio Campos Oliveira


Oral Surgery, Oral Medicine, Oral Pathology, and Oral Radiology | 2018

Mucoepidermoid Carcinoma: a Case Report

Márcio Campos Oliveira; Maria Emília Santos Pereira Ramos; Joana Dourado Martins; Jener Gonçalves de Farias; Antonio Varela Cancio; Valéria Souza Freitas; Tarsila De Carvalho Freitas Ramos


Oral Surgery, Oral Medicine, Oral Pathology, and Oral Radiology | 2017

OP - LANGERHANS CELL HISTIOCYTOSIS ON THE UPPER LIP: A CASE REPORT

Márcio Campos Oliveira; Jener Gonçalves de Farias; Antonio Varela Cancio; Ana Paula Eufrázio Do Nascimento Andrade; Valéria Souza Freitas; Maria Emília Santos Pereira Ramos; Jorge Esguiche Leon


Oral Surgery, Oral Medicine, Oral Pathology, and Oral Radiology | 2017

ORAL CICATRICIAL PEMPHIGOID IN A YOUNG WOMAN: A CASE REPORT

Tarsila De Carvalho Freitas Ramos; Márcio Campos Oliveira; Jener Gonçalves de Farias; Valéria Souza Freitas; Michelle Miranda Lopes Falcão; Joana Dourado Martins; Maria Emília Santos Pereira Ramos


Oral Surgery, Oral Medicine, Oral Pathology, and Oral Radiology | 2017

RECURRENT PARACOCCIDIOIDOMYCOSIS: A CASE REPORT

Márcio Campos Oliveira; Maria Emília Santos Pereira Ramos; Michelle Miranda Lopes Falcão; Valéria Souza Freitas; Jener Gonçalves de Farias; Ana Paula Eufrázio Do Nascimento Andrade; Tarsila De Carvalho Freitas Ramos


Oral Surgery, Oral Medicine, Oral Pathology, and Oral Radiology | 2015

Kuttner Tumor in Submandibular Gland: A Case Report

Isabela Fátima Araújo Souza; Elton Aguiar Oliveira; Jean Nunes dos Santos; Michelle Miranda Lopes Falcão; Maria Emília Santos Pereira Ramos; Tarsila De Carvalho Freitas Ramos; Valéria Souza Freitas

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Valéria Souza Freitas

State University of Feira de Santana

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Márcio Campos Oliveira

Federal University of Rio Grande do Norte

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Antonio Varela Cancio

State University of Feira de Santana

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Michelle Miranda Lopes Falcão

State University of Feira de Santana

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Joana Dourado Martins

State University of Feira de Santana

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