RESUMO
Dental implants are not routinely used for rehabilitation in veterinary dentistry. For some veterinarians, further studies are necessary to be considered for clinical use in animals. The objective of the present in vitro study was to evaluate static fatigue of dental implants and to correlate that with the bite strength of dogs described in the literature. Sixty implants and abutments were used with the smallest diameter of each brand of implant utilized in the study. Three groups (n = 20) were created on the basis of the implant diameter, all with external hex connector: 3.30â mm (group 1), 4.0â mm (group 2) and 5.0â mm (group 3). All groups were subjected to quasi-static loading at 30° to the implant's long axis in a universal machine (model AME-5â kN). The mean fracture strength for group 1 was 964 ± 187â N, for group 2 was 1618 ± 149 N and for group 3 was 2595 ± 161â N. Significant differences between the groups with respect to resistance after the load applications were observed (P < .05). The diameter of implants affects the resistance to external forces during the application of non-axial strength (off-axis loading) and must be considered during the planning of rehabilitation to avoid problems.
Assuntos
Implantes Dentários , Falha de Restauração Dentária , Animais , Força de Mordida , Implantes Dentários/veterinária , Falha de Restauração Dentária/veterinária , Análise do Estresse Dentário/veterinária , Cães , Teste de Materiais/veterináriaRESUMO
PURPOSE:To evaluate the effects of particulate (granule-shaped) SCB on bone repair relating it to its biocompatibility and bone neoformation.METHODS:Thirty Wistar rats were submitted to a one 7-mm-diameter defect and divided equally into three experimental groups, with two different postoperative times of evaluation, 90 and 120 days. Each calvaria defect was filled up with clot (control group), particulated autogenous bone or granulated SCB. Five animals of each group were assessed at 90 and 120 days after surgery. In these two periods, histological and histometric analysis were obtained.RESULTS:The clot group showed a bone resorption trend while the autogenous bone group a bone repair trend. However in the SCB group, the critical defect filled up only with fibrous connective tissue and presented none bone neoformation.CONCLUSION: The sugarcane biopolymer when used in critical size defects was a biocompatible material and proved to be a good material to fill bone cavities, keeping them as uniform areas filled with soft tissue and avoiding the tissue shrinkage.(AU)
Assuntos
Animais , Ratos , Ratos Wistar , Biopolímeros/uso terapêutico , Saccharum , Regeneração Óssea , Transplante Ósseo/veterinária , Implantes Dentários/veterináriaRESUMO
INTRODUCTION: In the present study, the stability and biocompatibility of a 30 percent polymethylmethacrylate (PMMA) filling material implanted in the masseter muscle of rats were investigated according to the cytologic characteristics presented in the graft versus host reaction. METHODS: The study included 20 rats, which were divided into 4 groups: groups I, II, III, and IV corresponded to animals evaluated 7, 14, 45, and 60 days after surgery, respectively. The implant was placed in the right masseter muscle at the level of the mandibular angle. RESULTS: After 7 days, lymphoplasmacytic inflammatory infiltrates, a fibrous capsule, a large number of neutrophils, macrophages, and exudate were observed. The second group (14 days) showed granulation tissue composed of a lymphoplasmacytic inflammatory infiltrate, newly formed vessels, and a fibrous capsule. However, the second group also exhibited regeneration of the muscle fibers, and a decreased number of neutrophils and exudate. After 45 and 60 days, the inflammatory infiltrate decreased in intensity compared to the first 2 groups. CONCLUSIONS: The inflammatory reaction caused by PMMA is transient and does not compromise the function and the shape of the masseter muscle tissue, suggesting that PMMA is biocompatible.
INTRODUÇÃO: Este trabalho busca avaliar, em ratos, a estabilidade e a biocompatibilidade de um material de preenchimento à base de polimetilmetacrilato (PMMA) a 30 por cento implantado no músculo masseter, por meio do padrão, e a organização reacional no tecido receptor. MÉTODO: Foram utilizados 20 ratos, divididos em quatro grupos: grupo I, que correspondeu ao período de 7 dias de pós-operatório; grupo II, de 14 dias; grupo III, de 45 dias; e grupo IV, de 60 dias. O implante foi realizado no músculo masseter direito, na região do ângulo da mandíbula. RESULTADOS: No período de 7 dias, observou-se presença de infiltrado inflamatório linfoplasmocitário, com formação de cápsula fibrosa e presença de grande número de neutrófilos, macrófagos e formação de exsudatos. Em 14 dias, observou-se a formação de um tecido de granulação composto por infiltrado inflamatório linfoplasmocitário, vasos de neoformação e cápsula fibrosa. Porém, nesse tempo experimental, nota-se a regeneração das fibras musculares e a diminuição do número de neutrófilos e exsudatos. Após 45 dias e 60 dias, observou-se, no tecido muscular, diminuição da intensidade do infiltrado inflamatório, comparativamente aos tempos experimentais anteriores. CONCLUSÕES: A reação inflamatória provocada pelo PMMA é transitória e não compromete as funções e o contorno desse tecido muscular, o que sugere que o PMMA é biocompatível.
Assuntos
Animais , Ratos , História do Século XXI , Ratos , Materiais Biocompatíveis , Implantes Dentários , Fibras Musculares Esqueléticas , Polimetil Metacrilato , Inflamação , Mandíbula , Músculo Masseter , Neutrófilos , Ratos/anatomia & histologia , Ratos/imunologia , Materiais Biocompatíveis/análise , Materiais Biocompatíveis/efeitos adversos , Implantes Dentários/efeitos adversos , Implantes Dentários/veterinária , Fibras Musculares Esqueléticas/patologia , Polimetil Metacrilato/análise , Polimetil Metacrilato/uso terapêutico , Inflamação/veterinária , Mandíbula/imunologia , Músculo Masseter/anatomia & histologia , Músculo Masseter/imunologia , Neutrófilos/patologiaRESUMO
Cinco cães de idades, raças e sexos distintos foram atendidos com histórico de perda dentária e subme¬tidos à reabilitação. O planejamento cirúrgico foi realizado por radiografia intraoral e/ ou tomografia computadorizada de feixe cônico e realizados com instrumentos desenvolvidos para utilização em humanos. A moldagem foi realizada incluindo o dente contra-lateral e os antagonistas e a prótese con¬feccionada de em tempo hábil para a instalação de carga imediata. Todos os animais se recuperaram prontamente e em apenas um deles houve a necessidade da troca da prótese em função de retração gengival
Five dogs of different ages, breeds and gender were attended with a history of tooth loss and submit¬ted to rehabilitation. Surgical planning was carried out by intra-oral radiography and/ or cone-beam computerized tomography and the treatment performed with tools developed for use in humans. The molding was carried out including the contra-lateral tooth and antagonists and the prosthesis was ma de in time for the installation by immediate loading. All animals recovered promptly and in only one of them it was needed the exchange of the prosthesis due to receding gums
Assuntos
Animais , Cães , Dente , Implantes Dentários/veterinária , Odontologia/veterinária , Prótese Dentária/veterináriaRESUMO
Cinco cães de idades, raças e sexos distintos foram atendidos com histórico de perda dentária e subme¬tidos à reabilitação. O planejamento cirúrgico foi realizado por radiografia intraoral e/ ou tomografia computadorizada de feixe cônico e realizados com instrumentos desenvolvidos para utilização em humanos. A moldagem foi realizada incluindo o dente contra-lateral e os antagonistas e a prótese con¬feccionada de em tempo hábil para a instalação de carga imediata. Todos os animais se recuperaram prontamente e em apenas um deles houve a necessidade da troca da prótese em função de retração gengival(AU)
Five dogs of different ages, breeds and gender were attended with a history of tooth loss and submit¬ted to rehabilitation. Surgical planning was carried out by intra-oral radiography and/ or cone-beam computerized tomography and the treatment performed with tools developed for use in humans. The molding was carried out including the contra-lateral tooth and antagonists and the prosthesis was ma de in time for the installation by immediate loading. All animals recovered promptly and in only one of them it was needed the exchange of the prosthesis due to receding gums(AU)
Assuntos
Animais , Cães , Prótese Dentária/veterinária , Dente , Implantes Dentários/veterinária , Odontologia/veterináriaRESUMO
Los implantes dentales han evolucionado de forma sustancial en los últimos 40 años; sin embargo, dudas sobre las características de la reparación ósea continúan toda vez que nuevos diseños y nuevos métodos quirúrgicos son aplicados. El objetivo de esta investigación es evidenciar la presencia de tejido mineralizado en diferentes regiones del implante. Se elaboró un estudio basado en un modelo de restauración inmediata, aplicado en la mandíbula de 7 canes machos. Se realizaron las exodontias de los premolares mandibulares y, después de 3 meses de recuperación, se instalaron 2 implantes endóseos bilaterales, siendo uno de tipo cónico y otro de tipo cilíndrico. Después de dos periodos de sacrificio se realizo una evaluación histomorfométrica en los cortes seleccionados. Los resultados se presentan de forma porcentual estableciendo comparaciones entre las áreas cervical, media y apical. Los implantes de morfología cónica sometidos al modelo de restauración inmediata, presentaron mayor formación ósea en todos los niveles evaluados. En todas las condiciones de trabajo el área cervical presentó mayor presencia de tejido mineralizado que el área apical. Concluimos que el modelo de restauración inmediata no es un obstáculo para la instalación de la secuencia apropiada de reparación ósea y que diferentes factores deben estar asociados a la mayor formación ósea presente en el área cervical de los implantes dentales.
Dental implants have evolved of substantial form in the last 40 years; however, doubt about osseous repair characteristic are maintained because new design and surgical method are applied. The aim of this research is show the mineralized tissue in different areas of the implant. Was done a study based to a immediate load model applied in 7 male dogs mandible. Was realized the dental extractions of de bilateral mandibles bicusp and after to 3 month of recuperations was installed two bilaterally implants, been conical and cylindered shape. After of two sacrifices period was realized a histomorphometric analysis in the selection cut. The results are present with perceptual form, establishing cervical, meddle and apical comparison. Conical implants with immediate restoration model were present more osseous formations in all evaluated level. For all conditions of work, cervical area presented more mineralized tissue than apical area. We conclude that immediately restoration model it is not an obstacle for the installation of the appropriate sequence for the osseous reparation and that different factors have been associated to the more osseous formation in the cervical area of the dental implants.