18 research outputs found
Urinary levels of catecholamines among individuals with and without sleep bruxism
Sleep bruxism (SB) is characterized by repetitive and coordinated mandible movements and non-functional teeth contacts during sleep time. Although the etiology of SB is controversial, the literature converges on its multifactorial origin. Occlusal factors, smoking, alcoholism, drug usage, stress, and anxiety have been described as SB trigger factors. Recent studies on this topic discussed the role of neurotransmitters on the development of SB.Thus, the purpose of this study was to detect and quantify the urinary levels of catecholamines, specifically of adrenaline, noradrenaline and dopamine, in subjects with SB and in control individuals.Urine from individuals with SB (n = 20) and without SB (n = 20) was subjected to liquid chromatography. The catecholamine data were compared by Mann-Whitney's test (p a parts per thousand currency sign 0.05).Our analysis showed higher levels of catecholamines in subjects with SB (adrenaline = 111.4 A mu g/24 h; noradrenaline = 261,5 A mu g/24 h; dopamine = 479.5 A mu g/24 h) than in control subjects (adrenaline = 35,0 A mu g/24 h; noradrenaline = 148,7 A mu g/24 h; dopamine = 201,7 A mu g/24 h). Statistical differences were found for the three catecholamines tested.It was concluded that individuals with SB have higher levels of urinary catecholamines
Análise anátomo-radiográfica da persistência do Forame de Huschke Anatomic and radiograph study of the persistence of Foramen of Huschke
OBJETIVO: o objetivo neste trabalho é avaliar e localizar o Forame de Huschke. FORMA DE ESTUDO: anatômico. MATERIAL E MÉTODO: utilizando materiais de contraste como a Guta percha e o sulfato de bário, através de técnicas radiográficas extrabucais, como a panorâmica, submentovértex e a tomografia linear lateral corrigida para a Articulação Têmporo-mandibular, em quatro crânios, onde foi verificada clinicamente a presença do Forame de Huschke. RESULTADO: Os resultados obtidos mostraram que o Forame de Huschke pôde ser observado em crânios secos após a sua evidenciação por meio de material de contraste nestas técnicas radiográficas.<br>AIM: the aim of this study is to assess and locate the Foramen of Huschke. STUDY DESIGN: anatomical. MATERIAL AND METHOD: using contrast material like gutta-percha and barium sulfate, through extraoral radiographs, such as panoramic, submental vertex and corrected saggital linear Temporal Mandibular Joint tomograms in four skulls where we clinically checked the existence of foramen of Huschke. RESULTS: The results proved that the foramen of Huschke can be observed in skulls submitted to contrast using radiographic techniques
Snoring and obstructive sleep apnea syndrome: a reflection on the role of dentistry in the current scientific scenario
INTRODUCTION: Finally the dentist has awaken to the fact that by being a health professional, he has as primary function to take good care of the welfare of patients. In face of this challenge, the dentist starts to understand his role in the treatment of snoring and of obstructive sleep apnea and hypopnea. OBJECTIVE: The current paper has the purpose of discussing the role of this professional in the diagnosis and treatment of these diseases, most specifically of the therapy involving inter-occlusal devices, emphasizing the importance of multidisciplinarity in the reestablishment of the quality of life of the patient
Morse taper internal connection implants: would abutment reseating influence retention?
Abstract Aim: To investigate whether the removal and reseating of the abutment influences the retention of Morse taper implant system. Methods: Two Morse taper implant systems were selected: Bicon Dental ImplantTM system (Bicon, LLC, Boston, MA, USA) and Kopp Implant(r) system (Kopp(r), Curitiba, PR, Brazil). In both systems, the abutment is connected to the implant with a locking taper. To seat the abutment, the same vertical force was applied in both systems. It was measured the compressive force necessary to engage effectively the locking taper connection and the tensile force to displace it. Results: The compressive force was determined by four activations in each abutment-implant set, and the sum of these forces was 21 N and 17 N in the BiconTM and Kopp(r) systems, respectively. Next, a tensile test was performed, revealing that the BiconTM system presented a 208 N resistance, whereas it was 194 N in the Kopp(r) system. Other three rounds of compression and tensile loads were applied, removing and reseating the abutment. We obtained the following tensile values: 367 N, 500 N and 756 N in the BiconTM System and 336 N, 360 N and 420 N in the Kopp(r) system. Conclusions: When the sets were subjected to repeated rounds of compressive and tensile forces, displacing and reseating the abutment, the tensile value increased
Morse taper internal connection implants: would abutment reseating influence retention?
investigate whether the removal and reseating of the abutment influences the retention of Morse taper implant system. Methods: Two Morse taper implant systems were selected: Bicon Dental ImplantTM system (Bicon, LLC, Boston, MA, USA) and Kopp Implant® system (Kopp®, Curitiba, PR, Brazil). In both systems, the abutment is connected to the implant with a locking taper. To seat the abutment, the same vertical force was applied in both systems. It was measured the compressive force necessary to engage effectively the locking taper connection and the tensile force to displace it. Results: The compressive force was determined by four activations in each abutment-implant set, and the sum of these forces was 21 N and 17 N in the BiconTM and Kopp® systems, respectively. Next, a tensile test was performed, revealing that the BiconTM system presented a 208 N resistance, whereas it was 194 N in the Kopp® system. Other three rounds of compression and tensile loads were applied, removing and reseating the abutment. We obtained the following tensile values: 367 N, 500 N and 756 N in the BiconTM System and 336 N, 360 N and 420 N in the Kopp® system. Conclusions: When the sets were subjected to repeated rounds of compressive and tensile forces, displacing and reseating the abutment, the tensile value increased
Uso da radiografia transcraniana para detectar alterações morfológicas no côndilo mandibular
RESUMO Objetivo: o objetivo deste estudo foi avaliar a acurácia das radiografias transcranianas (TRANS) convencionais na identificação das alterações morfolĂłgicas nos cĂ´ndilos mandibulares. MĂ©todos: a amostra consistiu em 36 cĂ´ndilos mandibulares, obtidos a partir de 18 crânios secos humanos, aleatoriamente selecionados, sem identificação de idade, gĂŞnero ou etnia. TrĂŞs especialistas em radiologia oral examinaram as TRANS para identificar possĂveis alterações nos cĂ´ndilos. Um quarto examinador realizou o exame macroscĂłpico, que foi considerado o padrĂŁo ouro do estudo. As imagens das TRANS e os exames macroscĂłpico foram classificados como (1) cĂ´ndilos com alteração ou (0) cĂ´ndilos sem alteração. A análise estatĂstica foi realizada atravĂ©s do teste X 2 e da curva ROC (receiver operator characteristic). O teste Kappa intra e interexaminadores foi realizado para os examinadores 1 a 3. Resultados: o teste X2 mostrou uma associação estatisticamente significativa entre as alterações no cĂ´ndilo vistas nas imagens TRANS e a presença de alterações macroscĂłpicas (p ( 0,05). A área sob a curva ROC foi de 0,83, com 96% de sensibilidade e 70% de especificidade. O valor Kappa para a concordância intraobservador foi de 0,78, enquanto que a concordância interexaminador foi de 0,71. ConclusĂŁo: o uso de radiografias transcranianas apresentou-se como mĂ©todo eficaz para a detecção de alterações morfolĂłgicas no cĂ´ndilo mandibular
Avaliação dos nĂveis de pressĂŁo sonora emitidos pelo aparelho de ressonância magnĂ©tica
RESUMO Objetivo: mensurar o nĂvel de pressĂŁo sonora emitido pelo aparelho de ressonância magnĂ©tica em funcionamento e verificar as sensações auditivas descritas pelos indivĂduos submetidos a este exame apĂłs a realização do mesmo. MĂ©todos: foi realizada a mensuração do ruĂdo produzido, durante a aquisição das imagens, por meio de um medidor de nĂvel de pressĂŁo sonora (decibelĂmetro) e a aplicação de um questionário com a finalidade de verificar as sensações auditivas apresentadas por estes indivĂduos apĂłs a realização do exame. Tal procedimento foi aplicado a 60 indivĂduos submetidos ao exame de ressonância magnĂ©tica do crânio. Resultados: o nĂvel de pressĂŁo sonora mĂ©dia apresentada durante a realização do exame foi inferior ao nĂvel de intensidade considerado como risco para lesões auditivas. No entanto, sensações como zumbido, ansiedade, plenitude auricular e alĂvio apĂłs o tĂ©rmino do exame foram citados pelos indivĂduos apĂłs a execução do mesmo. ConclusĂŁo: Ă© pertinente o uso de protetores auriculares como medida preventiva para o controle do nĂvel de ruĂdo que atinge a cĂłclea do indivĂduo, minimizando desta forma os efeitos fĂsicos e psicossociais decorrentes da exposição ao ruĂdo