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The aim of this study was to evaluate anxiety, stress and symptoms of temporomandibular disorders (TMD) among a sample of participants that practice choir singing as a recreational activity. As the literature shows the positive effects of choir singing on mental and physical health, we hypothesized that anxiety, stress and TMD symptoms would be less frequent in the choir group when compared to participants from the general population. The choir group included 33 adults who participated weekly in a choral singing group as a recreational activity and the comparison group included 40 participants from the general population. Choir singers had significantly lower levels of anxiety and TMD. A significant positive correlation was observed between anxiety and TMD scores. The groups did not differ regarding the presence of stress symptoms. It seems that choir singing was associated with better mental and physical outcomes. This study reinforces the promising benefits of choir singing as a recreational activity. Although we only included amateur singers in our sample, the literature shows that singing as a professional may be an etiologic factor for developing TMD. Future studies should explore differences between professional and amateur choir singers regarding TMD symptoms.

<p><strong>Objective: </strong>evaluate the bond strength of resin cements to new materials for application in intraradicular posts. <strong>Material and Methods: </strong>Five materials were evaluated: fiberglass, PET, polyethylene, polyacetal and PTFE. Two commercial resin cements (Rely X U200 and Rely X Arc) were applied on the test specimens of the materials (9x3mm) and the bonding was evaluated through the shear bond strength test, where the chisel operated with a load of 1kN and a velocity of 0.5mm/min at the cement/material interface. The data were analyzed by the Shapiro-Wilk test, followed by the two-way analysis of variance, performed with the Bonferroni post-test (α=0.05). <strong>Results: </strong>The glass fiber was statistically different from all evaluated materials (p&lt;0.05). There was no statistically significant difference between the other materials (p&gt;0.05). Comparing the two cements, a statistical difference was found between Rely X U200 and Arc only for the glass fiber (p=0). <strong>Conclusion: </strong>PET, polyethylene, polyacetal and PTFE exhibited reduced bond strength compared to the glass fiber.</p><p><strong>Keywords</strong></p><p>Resin cement; PET polymer; Polytetrafluoroethylene.</p>

RESUMO | Objetivo:Considerando os inúmeros benefícios a saúde física e mental proporcionados pelas atividades artísticas, o objetivo deste estudo é avaliar a relação entre a prática recreativa de instrumentos musicais e as disfunções temporomandibulares (DTM) e os distúrbios do sono (DS) em uma amostra de músicos integrantes de orquestras do interior de São Paulo que praticam instrumentos musicais como forma de lazer. Método: Trata-se de um estudo transversal constituído por dois grupos. O grupo controle, com indivíduos da comunidade em geral, apresentou idade média de 28,35 anos (±4,867), enquanto o grupo de músicos instrumentistas, 28,37 anos (±6,712). Ambos os grupos foram constituídos por 43 voluntários, sendo 14 mulheres e 29 homens. Os participantes responderam ao questionário anamnésico de Fonseca e ao questionário de Fletcher e Luckett para avaliar sintomas de DTM e distúrbios do sono, respectivamente. Resultados: Foi encontrada uma forte associação entre a presença de DTM e o tempo de prática musical, de modo que os participantes com pouca prática possuem 8,57 (p=0,002) vezes mais chances de apresentarem DTM do que os participantes com muita prática. Os grupos não diferiram quanto aos sintomas de DTM e DS e quanto a variáveis demográficas. Conclusão: A prática recreativa de instrumentos musicais em longo prazo pode diminuir as chances de desenvolvimento de disfunção temporomandibular. Este estudo reforça que tocar um instrumento musical por lazer traz benefícios para a saúde física, especificamente como fator de proteção ao desenvolvimento de disfunção temporomandibular. ABSTRACT | Effect of music instruments practice in temporomandibular joint dysfunction and sleep disorders • Objective: The aim of this study was to evaluate the relation among recreational practice of musical instruments, temporomandibular disorders (TMDs), and sleep disturbances in a sample of musicians that are members of orchestras in a southeast area of Brazil. The participants practice playing instruments as a leisure activity. Method: this was a cross-sectional study with two groups. The comparison group included members from the general population. Both group included 43 adults, being 14 women and 29 men. The mean age of comparison group is 28.35 (±4.867), and the mean age of musician group is 28.37 (±6.712). The participants completed self-rated questionnaires to assess TMDs symptoms and sleep disturbance. Results: the groups did not differ regarding the presence of TMDs symptoms, sleep disturbance, and demographic variables. A strong and negative correlation was observed between TMDs and time of playing a musical instrument. The participants with less practice in years in playing a musical instrument have 8.57 more chance of having TMDs than the musicians with a long history of playing an instrument. Conclusion: it seems that a long history of practicing a musical instrument as a leisure activity is associated with a lower chance of developing TMDs. This study reinforces the benefits of playing a musical instrument as a leisur...