Immunohistochemistry of resorption and inflammation factors in the periodontal ligament of human deciduous teeth

Abstract: The understanding of the biological mechanisms involved in root resorption in deciduous teeth is important to the future development of preventive measures and treatments of this condition. The aim of the present study was to compare the expression and immunostaining of iNOS, MMP-9, OPG and RANKL in the periodontal ligament (PDL) of deciduous teeth with physiologic root resorption (GI), inflammatory pathological root resorption (GII) and permanent teeth (GIII), the negative control. Teeth in GI (n = 10), GII (n = 10) and (GIII) (n = 10) were submitted to immunohistochemical analysis to determine the expression of iNOS, MMP-9, OPG, and RANKL. The immunostaining was analysed by optical density. Statistical analysis included one-way ANOVA, followed by Student-Newman-Keuls post hoc test (p < 0.05). The results showed that iNOS, MMP-9 and RANKL expression in the PDL was higher in GII compared to GI and GIII (p < 0.05). Moreover, RANKL expression was higher in GI compared to GIII (p < 0.001), while OPG immunolabelling was lower in GII compared to GI and GIII (p < 0.001). The PDL of deciduous teeth bearing inflammatory processed exhibited upregulation of resorption-associated factors as well as enzymes related to tissue degradation which, in turn explains the exacerbation and greater susceptibility of those teeth to root resorption process.

Characterization of biopsychosocial factors of patients with chronic nonspecific low back pain / Caracterização de fatores biopsicossociais de pacientes com dor lombar crônica inespecífica

ABSTRACT BACKGROUND AND OBJECTIVES: Low back pain is considered a public health problem worldwide and has a personal, social, occupational and economic impact. Psychosocial signs such as inappropriate beliefs about pain, fear of movement, anxiety, stress, depression and low job satisfaction are characteristics of individuals with low back pain. These clinical signs are mediators of chronic pain and disability. The present study aimed to assess psychological comorbidities in patients with chronic non-specific low back pain who are undergoing physical therapy and patients awaiting physical therapy; in addition to characterizing the psychosocial profile of these individuals. METHODS: This research was carried out with 31 individuals recruited from physical therapy clinics in the region of greater Florianópolis. They were divided into two groups: Treatment (TG) and non-treatment (CG). The following self-report instruments were applied: Hospital Anxiety and Depression Scale (HADS), Health Status Questionnaire (SF-36V2), Visual Analog Scale (VAS), Oswestry Low Back Pain Disability Index (OLBPDI), Fear-Avoidance Belief Questionnaire (FABQ) and Pain Castatrophizing Scale (PCS). RESULTS: Significant differences (p<0.05) were observed in the scores of the instruments applied between the groups. The CG had higher averages than the GT. CONCLUSION: The results obtained in this study support previous findings about the benefits of physical therapy for individuals with chronic nonspecific low back pain, suggesting that, in addition to reducing pain and disability, there are benefits related to psychosocial factors.

RESUMO JUSTIFICATIVA E OBJETIVOS A dor lombar é considerada um problema de saúde pública em todo o mundo e gera impacto pessoal, social, ocupacional e econômico. Os sinais psicossociais como crenças inapropriadas sobre a dor, medo do movimento, ansiedade, estresse, depressão e baixa satisfação no trabalho são características de indivíduos com lombalgia. Esses sinais clínicos são mediadores da dor crônica e incapacidade. O presente estudo teve como objetivo avaliar as comorbidades psicológicas em pacientes com dor lombar crônica inespecífica que estão em atendimento fisioterapêutico e pacientes que aguardam o atendimento de fisioterapia; além de caracterizar o perfil psicossocial desses indivíduos. MÉTODOS Estudo realizado com 31 indivíduos, recrutados em clínicas de fisioterapia na região da grande Florianópolis. Foram divididos em dois grupos: tratamento (GT/n=16) e não tratamento (GC/n=15). Foram aplicados os seguintes instrumentos de autorrelato: Hospital Anxiety and Depression Scale (HADS), Health Status Questionnaire (SF-36V2), Escala Analógica Visual (EAV), Oswestry Low Back Pain Disability Index (OLBPDI), Fear-Avoidance Belief Questionnaire (FABQ) and Pain Castatrophizing Scale (PCS). RESULTADOS: Foram observadas diferenças significativas (p<0,05) nos escores dos instrumentos aplicados entre os grupos. Sendo que o GC apresentou médias maiores que o GT. CONCLUSÃO Os resultados obtidos neste estudo apoiam descobertas anteriores sobre os benefícios da fisioterapia para indivíduos com dor lombar crônica inespecífica, sugerindo que, além da redução da dor e incapacidade, há benefícios relacionados aos fatores psicossociais.

Dança, Insuficiência Cardíaca e Função Erétil: Perspectiva de Melhor Manejo Clínico? / Dance, Heart Failure and Erectile Function: Perspective of Better Clinical Management?

Na fisiopatologia da Insuficiência Cardíaca (IC) tem-se dado destaque à hiperatividade simpática e à inflamação sistêmica de baixa intensidade, aspectos também presentes na disfunção erétil (DE). O exercício físico constitui-se estratégia que proporciona melhora desses parâmetros sendo plausível a hipótese de que quando exercido por meio da dança proporcionaria melhores resultados. Ao unir atividade física e música, a dança seria capaz, dentre outros mecanismos favoráveis, aprimorar o funcionamento das redes neurais centrais e periféricas, contribuindo para o restabelecimento da normalidade da função neuro-hormonal e redução da resposta inflamatória, o que aumentaria a eficácia do tratamento tanto da IC quanto da DE.

Biological compatibility of the endodontic paste prepared with tetracycline, thiamphenicol and zinc oxide implanted on the subcutaneous tissue of rats / Compatibilidad biológica de pasta endodóntica preparada con tetraciclina,tiamfenicol y óxido de zinc, implantado en el tejido subcutáneo de ratas

An important requirement for endodontic paste with antibiotics placed in direct contact with living tissues is biocompatibility. The aim of this study was to evaluate the paste biocompatibility prepared with zinc oxide (1.25mg), tetracycline (8mg) and thiamphenicol (26.67mg). The paste and its components were implanted separately through polyethylene sterile tubes of 10mm in length and 1.3mm in diameter, in the subcutaneous tissue of rats with the experiment control at intervals of 3, 7, 15 and 30 days. Each day 6 rats were used, being 3 of them with implant of the substances in four sites placed on the back of the animals and 3 sham animals where it was implanted the polyethylene empty tubes. The experimental animals were anesthetized in an intra-peritoneal way with ketamina and xilazina (0.75ml / g body weight). After the experimental periods, the animals were anesthetized with the same anesthetic overdose. It was held an excision biopsy of the implant area with 10 mm to the security limit included in paraffin following a plan of random histological cut and uniformlyisotropic or oriented cuts according to stereological principles, getting a statistical estimative of the relative amount of inflammatory cells or not on the test system, getting as a result the paste biocompatibility, being the zinc oxide the most toxic element for the cell quality found.

Un requisito importante para la pasta endodóntica preparada con antibióticos, que es colocada en contacto directo con los tejidos vivos es la biocompatibilidad. El objetivo de este estudio fue evaluar la biocompatibilidad de la pasta preparada con óxido del zinc (1,25mg), tetraciclina (8mg) y el tiamfenicol (26,67mg). La pasta y sus componentes fueron implantados por separado a través de tubos estériles de polietileno de 10 mm de longitud y de 1,3mm de diámetro en el tejido subcutáneo de ratas en intervalos de 3, 7, 15 y 30 días. Cada día, 6 ratas fueron implantadas en cuatro sitios ubicados en la parte posterior de los animales, 3 de ellas con el implante de las sustancias y 3 fueron implantados con los tubos de polietileno vacíos. Los animales del experimento fueron anestesiados intraperitteonealmen, con ketamina y xilasina (0,75 ml/g peso corporal). Después de los periodos experimentales, los animales fueron anestesiados con la misma sobredosis anestésica. Fue realizada una biopsia exisional del área del implante con 10 mm de límite de seguridad, luego se realizaron cortes histológico al azar uniformemente isotrópicos o orientados según los principios esteriológicos, consiguiendo un estimativo estadístico de la cantidad relativa de células inflamatorias en el sistema de prueba. Se obtuvieron resultados de la biocompatibilidad de la pasta, siendo el óxido del zinc el elemento mas tóxico según la cualidad de las células que fueron encontradas.