ABSTRACT Purpose The aim of this study was to determine the factors associated with temporomandibular disorders (TMD) in the non-institutionalized and institutionalized elderly population of Feira de Santana, Bahia, Brazil. Methods A cross-sectional study was carried out in 307 subjects over 60 years old of both genders, where 80 are institutionalized and 227 are non-institutionalized. The evaluation of TMD signs and symptoms was performed using the Fonseca Anamnestic Index (IAF) as to sociodemographic, systemic and otological factors. The results were analyzed by correlating the study factors and the prevalence of TMD. A 95% confidence interval (CI) and a 5% significance level were established for all the tests used. Results The results showed that 50.5% of the subjects presented some degree of TMD. The prevalence of TMD was 49.8% among non-institutionalized elderly individuals and of 52.5% among institutionalized individuals. Variation in the prevalence of TMD, with statistical significance according to gender, age, income, tinnitus, dizziness, and depression was observed. Conclusion The prevalence of TMD was significant among the elderly population. There was no statistically significant difference between the prevalence of TMD in institutionalized and non-institutionalized individuals. Identifying TMD in the elderly population may be difficult because the symptoms of these disorders are similar to symptoms commonly presented in some systemic disorders associated with aging.

The aim of this study was to evaluate the following acrylic resins: Clássico®, QC-20® and Lucitone®, recommended specifically for thermal polymerization, and Acron MC® and VIPI-WAVE®, made for polymerization by microwave energy. The resins were evaluated regarding their surface nanohardness and modulus of elasticity, while varying the polymerization time recommended by the manufacturer. They were also compared as to the presence of water absorbed by the samples. The technique used was nanoindentation, using the Nano Indenter XP®, MTS. According to an intra-group analysis, when using the polymerization time recommended by the manufacturer, a variation of 0.14 to 0.23 GPa for nanohardness and 2.61 to 3.73 GPa for modulus of elasticity was observed for the thermally polymerized resins. The variation for the resins made for polymerization by microwave energy was 0.15 to 0.22 GPa for nanohardness and 2.94 to 3.73 GPa for modulus of elasticity. The conclusion was that the Classico® resin presented higher nanohardness and higher modulus of elasticity values when compared to those of the same group, while Acron MC® presented the highest values for the same characteristics when compared to those of the same group. The water absorption evaluation showed that all the thermal polymerization resins, except for Lucitone®, presented significant nanohardness differences when submitted to dehydration or rehydration, while only Acron MC® presented no significant differences when submitted to a double polymerization time. Regarding the modulus of elasticity, it was observed that all the tested materials and products, except for Lucitone®, showed a significant increase in modulus of elasticity when submitted to a lack of hydration.