Effect of low-level laser therapy and calcitonin on bone repair in castrated rats: a densitometric study.

OBJECTIVE: To investigate the healing of bone defects in male rats treated with salmon calcitonin, low-level laser therapy (LLLT), or both. BACKGROUND: Healing of bone defects still represents a challenge to health professionals in several areas. In this article, the effect of calcitonin in combination with LLLT on bone repair was studied. Densitometry was used as a valuable tool for the measurement of bone regeneration. METHODS: Sixty male Wistar rats underwent bilateral castration surgery before the creation of a surgical bone defect. The animals were randomly divided into four groups: control, treated with calcitonin (Ca), treated with LLLT (La), and treated with calcitonin and LLLT (CaLa). Groups Ca and CaLa received 2 IU/kg of synthetic salmon calcitonin intramuscularly three times a week. Groups La and CaLa received laser therapy using a gallium-aluminum-arsenide laser (10 mW, 20 J/cm(2), wavelength 830 nm). Control animals were submitted to sham irradiation. The animals were sacrificed 7, 14, and 21 days after surgery, and bone defects were analyzed using densitometry. RESULTS: The CaLa group had a higher degree of bone regeneration 14 and 21 days after surgery. CONCLUSIONS: The La and CaLa had significantly higher bone mineral density than the control and Ca groups.

Homeopathic treatment for bone regeneration: experimental study.

AIM AND METHOD: The objective of this research was to study the effect of homeopathic treatment with Plumbum metallicum (Plumbum met.) on mandibular bone repair in rats. MATERIALS AND METHODS: We analyzed the mandibles of 60 male rats, approximately 3-month-old, randomly divided into three groups of 20 animals each: control, treated with calcitonin, and treated with a homeopathic medicine. A circumscribed bone defect measuring 4mm in diameter was made in the mandible and covered with a polytetrafluorethylene (PTFE) barrier. The group treated with calcitonin received 2IU/kg intramuscularly three times a week; the group treated with Plumbum met. 30c received three drops in water every day. The animals were sacrificed after 7, 14, 21 and 28 days. The mandibles were removed and submitted to histologic and histomorphometric analyses. RESULTS: Data were analyzed statistically by two-way ANOVA and by the Tukey test. The interaction effect (ANOVA, F df(6; 48)=4.64; p=0.001<0.05) indicated that the relationship between treatments was not the same at each time of sacrifice. Although statistical analysis of the histomorphometric data showed a similar results for the treated and control groups. But histological analysis showed complete filling of the surgical defect throughout its extent was only for the group treated with Plumbum met. CONCLUSION: The study demonstrated that for repair of surgical defects in rat mandibles Plumbum met. 30c and control did not differ significantly in histomorphometric terms.

Evaluation of staining methods for cytologic diagnosis of oral lesions.

OBJECTIVE: To compare the efficacy ofPapanicolaou, hematoxylin-eosin (H-E), Leishman and periodic acid-Schiff (PAS) staining for cytologic diagnosis of oral lesions. STUDY DESIGN: Patients from the Discipline of Stomatology, São José dos Campos Dental School, from the wards of Hosapital Heliópolis and from the dentistry outpatient clinic of the University Hospital, University of São Paulo Medical School, with the following diseases, were selected: erythematous candidiasis (n=9), pseudomembranous candidiasis (n=10), squamous cell carcinoma (n=19), herpes simplex (n=8), paracoccidioidomycosis (n=8) and pemphigus vulgaris (n=1). RESULTS: The different staining methods were compared regarding the quality of definition of cytoplasmic and nuclear morphologic characteristics and the identification of bacteria, fungi, inflammatory cells and secretions. Papanicolaou and H-E staining were considered better methods. In cases of fungal infections, PAS staining is useful and should be applied as a complementary method. CONCLUSION: Within the limitations of this study, it can be concluded that the cytologic diagnosis of oral lesions along with different staining methods is a useful tool for oral diagnosis.

Estudo do efeito do plumbum metallicum 30ch na reparação óssea em mandíbula de ratos sem barreira mecânica / Study of of plumbum metallicum 30ch effect in bone repair of rat mandibles without

Objetivos: O objetivo deste trabalho foi avaliar os efeitos da administração sistêmica do chumbo, preparadode acordo com a farmacotécnica homeopática Plumbum metallicum 30CH, na reparação óssea. Material emétodos: foram utilizados trinta ratos machos com três meses de idade, nos quais foram confeccionadosdefeitos cirúrgicos trans-ósseos com broca de aço nº 06 na região do ângulo da mandíbula do lado direito, semutilização de barreira mecânica. Cada animal do grupo experimental recebeu três gotas diárias de Plumbummetallicum 30CH acrescidas à mamadeira de água. Os animais do grupo controle receberam apenas água. Trêsanimais foram sacrificados nos seguintes períodos experimentais: um, sete, 14, 21 e 28 dias após a cirurgia.Após o sacrifício, as mandíbulas foram removidas, descalcificadas e submetidas ao preparo histológico derotina. Foram submetidas a cortes semi-seriados e coradas pelos métodos de hematoxilina-eosina e tricômicode Masson para análise histológica em microscópio de luz. Resultados: os resultados obtidos neste trabalhomostraram que o medicamento foi eficiente na estimulação da reparação óssea. A análise histológica qualitativamostrou evidência de efeito favorável do Plumbum mettalicum 30 CH. Apesar da interferência dotecido muscular, os animais mostraram, já a partir do período de 14 dias, neoformação óssea em praticamentetoda a extensão do defeito. Conclusão: a utilização do Plumbum metallicum 30CH favoreceu a reparação dedefeitos ósseos em mandíbula de ratos machos, sem a utilização de barreira mecânica.