RESUMO
The aim of this study was to compare the size and shape of bone fragments produced by the ultrasonic and drilling procedures in implant site preparation. Six pieces of rib selected as experimental animal model of 15 cm in length and at least 13 mm of thickness were used. The samples were treated and divided into 2 groups as follows: group A (GA) ultrasonic implant site preparation technique; group B (GB) traditional surgical drill technique. Ultrasonic implant site preparation (GA) was carried out using a sequence of progressive diameter (1.00 mm, 2.00 mm and 3.00 mm) conical inserts at a depth of 10 mm. Standard drill implant site procedure (GB) was carried out with a sequence of 1.00 mm, 2.00 mm, and 3.00 mm cylindrical twist drills, for preparing an implant site at a depth of 10 mm. From each group bone fragments (0.1 gr) were collected from both cortical and cancellous bone preparation and their dimensions were evaluated by optic microscope analysis. The bone debris dimensions procured by cortical bone of Group A and Group B were, respectively, 0.14×0.16 mm (±0.13) and 1.15 ×0.92 mm (±0.68). The bone debris dimensions procured by cancellous bone of Group A and Group B were, respectively, 0.15×0.10 mm (±0.10) and 1.98×1.27 mm (±0.94). Ultrasonic implant site preparation technique was able to micronize bone and to remove all debris with cooling system. Surgical drills tend to fracture bone, creating a weaker structure and fragments of larger size, which remain in considerable quantity over bone walls during site preparation. Within the limits of the present study, the ultrasonic implant preparation was able to produce reduced bone sediments and a clear bed implant favoring osseointegration.
Assuntos
Osteotomia , Ultrassom , Animais , Osso e Ossos/diagnóstico por imagem , Osso e Ossos/cirurgia , Bovinos , Modelos Animais , OsseointegraçãoRESUMO
The aim of this investigation was to conduct a comparative histometric analysis of bone-implant interface between a rough titanium surface and smooth implants in low-density human jawbone after 3, 6, and 12 months of submerged, undisturbed healing. Six adult volunteer patients undergoing standard implant placement were enrolled in this project. Each patient received 1 smooth and 1 rough implant. After 3, 6, and 12 months, the implants were harvested for histometric analysis. The values of bone-implant contact were the following: 3 months smooth 6.2%, 3 months rough 58.9%, 6 months smooth 3.55%, 6 months rough 72.9%, 12 months smooth 6.7%, and 12 months rough 76.75%. The results showed that in low-density bone the rough surface dramatically enhanced the amount of bone-to-implant contact. Because of the small number of implants examined, definite conclusions cannot be drawn, even though the statistical analysis showed significant differences between the smooth and rough groups (P = .0129; F = 76.065). Nevertheless, a trend was evident in these observations: while a rough implant surface may enhance the rate of osseointegration, it is not able to significantly change the bone density, and an implant placed low-density bone is at a higher risk of failure when occlusal loading begins.
Assuntos
Implantação Dentária Endóssea , Implantes Dentários , Planejamento de Prótese Dentária , Mandíbula/patologia , Titânio/química , Adulto , Análise de Variância , Força de Mordida , Densidade Óssea , Falha de Restauração Dentária , Feminino , Seguimentos , Humanos , Masculino , Mandíbula/cirurgia , Osseointegração , Osteogênese , Fatores de Risco , Propriedades de SuperfícieRESUMO
Los autores describen un estudio anatómico de músculos, aponeurosis, órganos, vasos, nervios y linfáticos de la pelvis extraídos tanto de autores clásicos y modernos como estudio de piezas anatómicas realizados en la Cátedra de Anatomía que dirige el Dr. Emilio Czerniuk, de la Facultad de Medicina de la UBA. Se hace una descripción completa de la técnica de la prostatectomía radical, sus indicaciones, contyraindicaciones y sus complicaciones. Los autores proponen diversas alternativas para su solución.Para la anastomosis de la uretra con la vejiga se describe la técnica de Flocks y se propone una modificación. Esta técnica se indica únicamenteen los cánceres localizados de próstata y se hace especial hicapié en el hecho de que una cirugía oncológica debe extirpar todo el tumor y sus adyacencias para que no queden límites positivos
Assuntos
Humanos , Prostatectomia , Prostatectomia/efeitos adversos , Prostatectomia , Neoplasias da Próstata/cirurgia , Excisão de Linfonodo , Pelve , Uretra/cirurgiaRESUMO
Los autores describen un estudio anatómico de músculos, aponeurosis, órganos, vasos, nervios y linfáticos de la pelvis extraídos tanto de autores clásicos y modernos como estudio de piezas anatómicas realizados en la Cátedra de Anatomía que dirige el Dr. Emilio Czerniuk, de la Facultad de Medicina de la UBA. Se hace una descripción completa de la técnica de la prostatectomía radical, sus indicaciones, contyraindicaciones y sus complicaciones. Los autores proponen diversas alternativas para su solución.Para la anastomosis de la uretra con la vejiga se describe la técnica de Flocks y se propone una modificación. Esta técnica se indica únicamenteen los cánceres localizados de próstata y se hace especial hicapié en el hecho de que una cirugía oncológica debe extirpar todo el tumor y sus adyacencias para que no queden límites positivos(AU)
