The goal of this study was to evaluate the distribution of stresses generated around implants with different internal-cone abutments by photoelastic (PA) and finite element analysis (FEA). For FEA, implant and abutments with different internal-cone connections (H- hexagonal and S- solid) were scanned, 3D meshes were modeled and objects were loaded with computer software. Trabecular and cortical bones and photoelastic resin blocks were simulated. The PA was performed with photoelastic resin blocks where implants were included and different abutments were bolted. Specimens were observed in the circular polariscope with the application device attached, where loads were applied on same conditions as FEA. FEA images showed very similar stress distribution between two models with different abutments. Differences were observed between stress distribution in bone and resin blocks; PA images resembled those obtained on resin block FEA. PA images were also quantitatively analyzed by comparing the values assigned to fringes. It was observed that S abutment distributes loads more evenly to bone adjacent to an implant when compared to H abutment, for both analysis methods used. It was observed that the PA has generated very similar results to those obtained in FEA with the resin block.

The modified design of the zirconia coping reduces the stress concentration at the interface with the veneer ceramic, and the simplified preparation can exert a stress distribution similar to that of the anatomical preparation at and near the load point, when load is applied to the center of the crown.

To evaluate the effects of bonding agent and thermo-mechanical cycling on the flexural bond strength of a gold and cobalt-chromium alloy to a feldspathic ceramic. Sixty-four metal bars were fused (3 × 25 × 0.5 mm 3 ): 32 with a gold alloy and 32 with a cobalt-chromium (Co-Cr) alloy. Over the bars' central area (8 × 3 mm 2 ), a bonding agent and two glass-ceramic layers were fired, totaling 1 mm in ceramic thickness. Eight specimens of each alloy were randomly divided according to the bonding agent (application or the absence thereof) and the thermo-mechanical cycle (3,000 thermo-cycles and 20,000 mechanical-cycles; or no cycling). The flexural bond strength between the metal alloy and the ceramic was evaluated by a three-point bending test and data were subjected to three-way ANOVA and Tukey's test (α = 0.05). The failure mode was classified. No significant interactions were observed among the three factors evaluated (alloy, bonding agent, and thermo-mechanical cycling; p = 0.5734). There was no statistically significant difference between the alloys (p = 0.8559). The interaction between alloy/bonding agent (p = 0.0001) showed that, for the gold alloy, the group with the bonding agent showed mean values of flexural bond strength significantly higher than those of the group without the bonding agent, while, for the Co-Cr alloy, the groups with or without bonding agent had similar mean values of flexural bond strength. The interaction between alloy/thermo-mechanical cycling (p = 0.0001) showed that, for the gold alloy, the non-cycled group had flexural bond strength mean values significantly greater than those of the cycled group, while for the Co-Cr alloy, both non-cycled and cycled groups had similar mean values. The bonding agent significantly improved the flexural bond strength between the ceramic and the gold alloy, but had no influence on the Co-Cr alloy. Thermo-mechanical cycling decreased the flexural bond strength of the gold alloy specimens, but did not affect the Co-Cr specimens.

Objetivo: Avaliar a prevalência da Disfunção Temporomandibular em idosos não institucionalizados. Métodos: Foi realizado um estudo transversal, desenvolvido com idosos não institucionalizados, com idade igual ou superior a 60 anos, cadastrados no Programa da Saúde da Família do Município de Areia/ Paraíba-Brasil, no período de janeiro a junho de 2013. Utilizou-se como instrumento de coleta o Índice Anamnésico de Fonseca (DMF). Resultados: A prevalência de DTM no grupo estudado foi de 46,5%. A maioria dos idosos era do gênero feminino (63,0%),  faixa etária entre 60 e 69 anos (46,3%), casados (53,6%), analfabetos (59,7%), aposentados (87,6%) e com renda de até um salário mínimo (86,3%). Verificou-se associação significativa entre a prevalência da DTM e as variáveis: genêro, escolaridade e renda. A DTM foi mais prevalente no genêro feminino (49,%), entre os analfabetos(49,9%) e entre aqueles que tinham renda até um salário mínimo(49,1%). Quanto ao grau de severidade da disfunção destacou-se a DTM leve, verificando-se associação significativa com estado civil (p=0,011) e com a renda (p=0,036. Conclusão: Pode-se verificar que, nos idosos estudados, a prevalência de DTM  foi de 46,5%,com predominância do grau de severidade leve, atingindo com mais frequência as mulheres.

Although the majority of cystic jaw lesions are well studied, discussed and defined, the Lateral Periodontal Cyst is a relatively uncommon lesion and its etiology has not been yet clarified. For the rarity of the lesion, a case of Lateral Periodontal Cyst is reported with focus on clinical, radiographic and microscopic aspects.