Retention system for implant-supported dentures used by brazilian dentists who work in implant dentistry

Objective: To provide the dentists with support in the choice of the cement or screw type of retention for implant-supported dentures, according to the patient’s problem. Methods: An opinion questionnaire was applied to a sample of 468 participants, all dentists working in the field of Implant Dentistry, of whom 272 (58.1%) participated in the 4th International Congress of Osseointegration of APCD, held in São Paulo (SP) from 6 to 9 May 2004, 119 (25.4%) participated in the 2nd International Congress of Implant Dentistry of Minas Gerais, between 10 and 12 June 2004 and 77 (16.5%) were professors and specialization and master students from São Leopoldo Mandic. Results: The results showed that 254 participants opted for the screw-retained system while 214 opted for the cement-retained system. Conclusion: There was a preference for the use of the screw-retained system, and that both cemented and screw-retained systems have advantages and disadvantages, so that the dentist is left to decide and evaluate them in order to indicate and use them with confidence in different clinical cases

Crystal of hemoglobin in capybaras (Hydrochaeris hidrochaeris) blood and its skillful importance

O presente trabalho teve como objetivo selecionar um método para identificação de animais, fornecendo subsídios indispensáveis para a caracterização ou descaracterização de crime, tanto na matança de animais silvestres como torturas de animais domésticos, ambos protegidos por lei, bem como verificar a cristalização da hemoglobina, mais precisamente da oxihemoglobina, em sangue “in natura”, com anticoagulante e coagulado de capivaras. Foram utilizadas preparações modificadas de Costa (1929) que possui baixo custo de implantação, rapidez na obtenção dos resultados, por ser de fácil preparação e manejo. Após a compilação e análise dos dados verificou-se que a quantidade, o tamanho, a cor, o local e o contorno do cristal não estão associados ao sexo do animal e que a quantidade de cristal depende da técnica empregada, sendo a técnica 2 (o sangue fresco oxalatado é centrifugado, o sedimento é laqueado pela saponina; adiciona-se sulfato de sódio, agita-se energicamente e em seguida centrifuga-se durante 10 minutos na velocidade 4) a que produz mais cristais, maiores, com coloração mais intensa (rosa intenso) e com distribuição regular na lâmina.The aim of this work was to select a method for animal identification, supplying important subsidies to characterize or not of crime as much as slaughter of wild animals as tortures of domestic ones, both protected by law, as well as verify the crystallization of the hemoglobin, precisely oxihemoglobin, in blood ‘in nature’ with anticoagulant and coagulate in capybaras. Preparations modified by Costa were used in this work. This technique has a low cost of implementation, it is fast to obtain results and it is easy to prepare and handle. After the compilation and data analysis, it was verified the amount, size, color, site and the contour of the crystal are not associated with the sex of animal; also, the amount of the crystal depends on the applied technique, where the technique 2 (fresh blood oxalate is spinet, the sediment is lacqued with saporin; sulfate of sodium is added and mix it up energetically during 10 minutes at speed 4) the one that yelled more crystals, bigger crystals intense coloration (pink intense) and regularly distributed in the blade

A importancia pericial do estudo comparativo histomorfologico do esmalte, dentina e cemento de dentes humanos e de outros animais

Orientador: Eduardo DarugeDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: Não informadoAbstract: Not informed.MestradoOdontologia Legal e DeontologiaMestre em Odontologi

A importancia pericial do estudo comparativo histomorfologico do osso humano e de outros generos

Orientador: Eduardo DarugeTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: É fato notório que a identificação do osso ou fragmento deste contribui sobremaneira no esclarecimento de questões jurídicas. Quando não dispomos do esqueleto completo ou de ossos íntegros, a análise de características histomorfológicas ósseas tornam-se fator decisivo para a elucidação de certos casos de identificação. O propósito do presente estudo foi ampliar ou buscar novas possibilidades na identificação de fragmentos ósseos de seres humanos e de outros 19 mamíferos de maior proximidade com o homem. Assim analisamos os sistemas de Havers, os canais de Havers, os osteócitos e os canalículos dos osteócitos, do homem, da anta, do aracambé, do boi, da cabra, do cachorro-do-mato, do cão, da capivara, do carneiro, do cateto, do cavalo, do coelho, da cutia, do gato, do macaco-prego, da onça, do ouriço, do porco, do tamanduá-bandeira e do veado-cervo. Realizamos cortes histológicos por desgaste no tecido ósseo de cada mamífero estudado, no sentido longitudinal e transversal, e analisamos em microscopia de luz. Os resultados demonstram com clareza e precisão que a análise histomorfológica das estruturas citadas possibilitam a identificação e diferenciação dos gêneros _estudados, ou então, excluem a possibilidade do fragmento ósseo examinado pertencer ao gênero HOMOAbstract: It is very well known that the identification of the bone or abone fragment means an extremely valuable contribution when the clarification of juridical issues is being performed. When the complete skeleton or whole bones are not available, the analysis of the osseous histomorphologic characteristics becomes a decisive factor for the elucidation of certain cases of identification. This present study has been conducted aiming at enlarging or searching for new possibilities for identifying osseous fragments of human beings or of some nineteen (19) mammals with characteristics closest to those of the human beings. Thus, the systems and the canaIs of Harvers as well as the osteocytes and the canaliculi of the osteocytes of the human beings, the anta, the aracambé, the OX, the goat, the grison, the dog, the capivara, the sheep, the cateto, the horse, the rabbit, the agouti, the cat, the capuchin monkey, the puma, the hedgehog, the pig, the tamanduá-bandeira (the great anteater), and the veado-cervo (any deer) have been analyzed. The osseous tissue of the mammals have been histologically cut by abrasion - in the longitudinal and transversal way - and analyzed under light microscopy. The results have clearly and accurately shown that the histomorphologic analysis of the above mentioned structures makes it possible either to identify and differentiate the genders studied or to exclude the possibility that the osseous fragment may belong to the gender HOMODoutoradoDoutor em Odontologia Legal e Deontologi

Finite Element Analysis of 2 Immediate Loading Systems in Edentulous Mandible: Rigid and Semirigid Splinting of Implants

Purpose: The objective of this study was to evaluate the stress on the cortical bone around single body dental implants supporting mandibular complete fixed denture with rigid (Neopronto System-Neodent) or semirigid splinting system (Barra Distal System-Neodent). Methods and Materials: Stress levels on several system components were analyzed through finite element analysis. Focusing on stress concentration at cortical bone around single body dental implants supporting mandibular complete fixed dentures with rigid ( Neopronto System-Neodent) or semirigid splinting system ( Barra Distal System-Neodent), after axial and oblique occlusal loading simulation, applied in the last cantilever element. Results: The results showed that semirigid implant splinting generated lower von Mises stress in the cortical bone under axial loading. Rigid implant splinting generated higher von Mises stress in the cortical bone under oblique loading. Conclusion: It was concluded that the use of a semirigid system for rehabilitation of edentulous mandibles by means of immediate implant-supported fixed complete denture is recommended, because it reduces stress concentration in the cortical bone. As a consequence, bone level is better preserved, and implant survival is improved. Nevertheless, for both situations the cortical bone integrity was protected, because the maximum stress level findings were lower than those pointed in the literature as being harmful. The maximum stress limit for cortical bone (167 MPa) represents the threshold between plastic and elastic state for a given material. Because any force is applied to an object, and there is no deformation, we can conclude that the elastic threshold was not surpassed, keeping its structural integrity. If the force is higher than the plastic threshold, the object will suffer permanent deformation. In cortical bone, this represents the beginning of bone resorption and/or remodeling processes, which, according to our simulated loading, would not occur. ( Implant Dent 2010; 19:39-49