Introdução: A disfunção temporomandibular (DTM) pode estar presente, em média, em 50% da população onde apresentam algum sinal ou sintoma da patologia. Objetivo: revisar a epidemiologia da disfunção temporomandibular na literatura; com ênfase nas seguintes variáveis: gênero, faixa etária e sinais e sintomas. Material e método: As bases de dados utilizadas foram Pubmed, Scielo, Bireme e Lilacs em que foram coletados artigos através das palavras-chaves que foram: Epidemiologia; Transtornos da Articulação Temporomandibular; Sinais e Sintomas. Já os critérios de inclusão apresentados foram: literatura que aborde a temática em estudo, literatura dos últimos anos, estudos epidemiológicos e clínicos, revisão sistemática, literatura em português e inglês. Enquanto que os critérios de exclusão foram: carta ao editor, artigo de opinião, literatura duplicada em base de dados, por fim literatura que não apresenta as variáveis estudadas. Resultado: A epidemiologia da disfunção temporomandibular apresenta-se muito prevalente em populações distintas, como idosos, adolescentes e principalmente em adultos jovens. Conclusão: Os sinais e sintomas mais frequentes são dor muscular, dor articular, estalido e tensão emocional.
The loss of dental structure caused by endodontic treatment is responsible for a decrease in tooth resistance, which increases susceptibility to fracture. Therefore, it is important that minimally invasive treatments be performed to preserve the dental structure and increase the resistance to fracture of endodontically treated posterior teeth. To evaluate under axial loads, using the finite element method, the stress distribution in endodontically treated molars restored with both transfixed or vertical glass fiber posts (GFP) and resin composite. An endodontically treated molar 3D-model was analyzed using finite element analyses under four different conditions, class II resin composite (G1, control model), vertical glass fiber post (G2), transfixed glass fiber posts (G3) and vertical and transfixed glass fiber posts (G4). Ideal contacts were considered between restoration/resin composite and resin composite/tooth. An axial load (300 N) was applied to the occlusal surface. The resulting tensile stresses were calculated for the enamel and dentin tissue from five different viewports (occlusal, buccal, palatal, mesial and distal views). According to the stress maps, similar stress trends were observed, regardless of the glass fiber post treatment. In addition, for the G1 model (without GFP), a high-stress magnitude can be noticed in the proximal faces of enamel (7.7 to 14 MPa) and dentin (2.1 to 3.3 MPa) tissue. The use of transfixed glass fiber post is not indicated to reduce the stresses, under axial loads, in both enamel and dentin tissue in endodontically treated molar with a class II cavity.
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