Mechanical-physicochemical properties and biocompatibility of catechin-incorporated adhesive resins.

OBJECTIVES: Several anti-proteolytic dentin therapies are being exhaustively studied in an attempt to reduce dentin bond degradation and improve clinical performance and longevity of adhesive restorations. This study assessed the effect of epigallocatechin-3-gallate (EGCG) on long-term bond strength when incorporated into adhesives. MATERIAL AND METHODS: Adhesive systems were formulated with EGCG concentrations of 0 wt%: (no EGCG; control); 0.5 wt% EGCG; 1.0 wt% EGCG, and 1.5 wt% EGCG. Flexural strength (FS), modulus of elasticity (ME), modulus of resilience (MR), compressive strength (CS), degree of conversion (DC), polymerization shrinkage (PS), percentage of water sorption (%WS), percentage of water solubility (%WL) and cytotoxicity properties were tested. Dentin microtensile bond strength (µTBS) was evaluated after 24 h and again after 6 months of water storage. The adhesive interface was analyzed using scanning electron microscopy (SEM). RESULTS: No significant differences were found among the groups in terms of FS, ME, MR, CS and PS. EGCG-doped adhesives increased the DC relative to the control group. EGCG concentrations of 1.0 wt% and 0.5 wt% decreased the WS of adhesives. WL decreased in all cases in which EGCG was added to adhesives, regardless of the concentration. EGCG concentrations of 1.0 wt% and 0.5 wt% reduced cytotoxicity. EGCG concentrations of 1.0 wt% and 0.5 wt% preserved µTBS after 6 months of storage, while 1.5 wt% EGCG significantly decreased µTBS. SEM: the integrity of the hybrid layer was maintained in the 0.5 wt% and 1.0 wt% EGCG groups. CONCLUSION: EGCG concentrations of 1.0 wt% and 0.5 wt% showed better biological and mechanical performance, preserved bond strength and adhesive interface, and reduced cytotoxicity.

Mechanical-physicochemical properties and biocompatibility of catechin-incorporated adhesive resins

Abstract Several anti-proteolytic dentin therapies are being exhaustively studied in an attempt to reduce dentin bond degradation and improve clinical performance and longevity of adhesive restorations. Objectives This study assessed the effect of epigallocatechin-3-gallate (EGCG) on long-term bond strength when incorporated into adhesives. Material and Methods Adhesive systems were formulated with EGCG concentrations of 0 wt%: (no EGCG; control); 0.5 wt% EGCG; 1.0 wt% EGCG, and 1.5 wt% EGCG. Flexural strength (FS), modulus of elasticity (ME), modulus of resilience (MR), compressive strength (CS), degree of conversion (DC), polymerization shrinkage (PS), percentage of water sorption (%WS), percentage of water solubility (%WL) and cytotoxicity properties were tested. Dentin microtensile bond strength (µTBS) was evaluated after 24 h and again after 6 months of water storage. The adhesive interface was analyzed using scanning electron microscopy (SEM). Results No significant differences were found among the groups in terms of FS, ME, MR, CS and PS. EGCG-doped adhesives increased the DC relative to the control group. EGCG concentrations of 1.0 wt% and 0.5 wt% decreased the WS of adhesives. WL decreased in all cases in which EGCG was added to adhesives, regardless of the concentration. EGCG concentrations of 1.0 wt% and 0.5 wt% reduced cytotoxicity. EGCG concentrations of 1.0 wt% and 0.5 wt% preserved µTBS after 6 months of storage, while 1.5 wt% EGCG significantly decreased µTBS. SEM: the integrity of the hybrid layer was maintained in the 0.5 wt% and 1.0 wt% EGCG groups. Conclusion EGCG concentrations of 1.0 wt% and 0.5 wt% showed better biological and mechanical performance, preserved bond strength and adhesive interface, and reduced cytotoxicity.

Incidência de estresse e sonolência diurna em grávidas / Incidence of stress and diurnal drowsiness in pregnants

A gravidez acarreta várias alterações no corpo da mulher decorrente da interação mãe e feto. A sonolência diurna, é um dos sintomas apresentados pela gestante e traz várias complicações, tanto para o desempenho no trabalho quanto nas atividades do cotidiano, influenciando negativamente na qualidade de vida da gestante. Além da sonolência, o medo das situações inesperadas, indesejadas ou desconhecidas faz com que as grávidas tenham seus níveis de estresse muito elevados. Sendo este transmitido ao bebê quimicamente por hormônios. Este trabalho teve por objetivo verificar o nível de estresse e sonolência diurna em mulheres primíparas. Foram selecionadas dezenove voluntárias, com idades entre dezessete e trinta e três anos (Idade média 23 anos+/-13,42), residentes em Município de Bocaiúva, região norte de Minas Gerais e que utilizavam o PSF(Programa de Saúde da Família). Todas as voluntárias na primeira avaliação encontravam-se no 5º mês de gestação. As gestantes foram acompanhadas mensalmente e em cada consulta do pré-natal responderam ao questionário de Sintomas de Estresse para adultos de Lipp(ISSL) e escala de Sonolência de Epwort (ESE). Evidenciou-se que o 8º mês é o de maior índice de estresse com 100% das gestantes, sendo este de maior componente psicológico ao contrário da sonolência que se mantém em todos os meses estudados. Os valores de sonolência diurna e níveis de estresse e de sonolência diária encontram-se acima da media da população.

Pregnancy brings many changes in the body of a woman from the interaction mother and fetus. The daytime sleepiness, is one of the symptoms displayed by the pregnant and brings several complications, both for the performance at work and in activities of daily life, impacting negatively on the quality of life of the pregnant woman. In addition to sleepiness, the fear of unexpected situations, unwanted or unknown causes the pregnant have their very high levels of stress. This being transmitted to the baby chemically by hormones. This study aimed to ascertain the level os stress and daytime sleepiness in primiparous women. We selected nineteen volunteers, aged between seventwwn and thirty-threeyears ( average age 23 years+/-13.42). living in the Município Bocaiúva, the northern region of Minas gerais and using the PSF ( Health Program Family). All volunteers in the first assessment were in the 5th month of pregnancy. The women were followed up monthkly and in consultation with each prenatal responded to the questionnaire for adult Stress Symptoms of the Lipp (ISSL) and the Spwort Sleepiness Scale (ESS). There was the 8th month is the largest index of stress with 100% of pregnant women, which is the largest component psychological unlike the drowsiness that is maintained in every month studied. The level of dytime sleepiness and levels of stress and sleepiness daily, are above the average population.