RESUMEN
O sistema de conexão em Prótese Parcial removível (PPR) tem por função determinar, de forma rígida ou semi-rígida, a ligação dos retentores, aplicados sobre dentes, à sela, que recobre a fibromucosa, sendo, portanto, mediador entre dois elementos que reagem de maneira diferente diante dos esforços mastigatórios. As conexões podem ser rígidas, elásticas ou articuladas. Na conexão rígida, a carga que incide nos dentes artificiais é transmitida, sem ser dissipada, para os elementos de suporte, semelhante a uma prótese fixa. As conexões não-rígidas foram desenvolvidas nas próteses removíveis a encaixe. A denominada conexão elastica (barra rompe-forças) foi idealizada quando da observação de aparelhos removíveis dentomucossuportados, em que se observavam duas estruturas distintas, fibromucosa e ligamento periodontal, sendo responsáveis por transmitir simultaneamente a força recebida pela prótese removível. Deste modo, esta conexão possbilitará uma distribuição equânime das carghas mastigatórias entre a fibromucosa e os dentes suporte. O presente artigo tem como objetivo relatar o emprego da conexão elástica em um caso clínico realizado na disciplina de PPR da FOUFBA e a possibilidade de ter sucesso com este sistema
Asunto(s)
Persona de Mediana Edad , Humanos , Femenino , Abrazadera Dental , Dentadura Parcial Removible , Técnica de Perno Muñón , Pilares Dentales , Diseño de Prótesis Dental , Retención de Prótesis DentalesRESUMEN
OBJECTIVE: The aim of the present investigation was to assess histologically the effect of LLLT (GaAIAs, 830 nm, 40 mW, CW, (Phi) approximately 0.6 mm, 16 J/cm(2) per session) on the repair of surgical defects created in the femur of the Wistar Albinus rat. The defects were filled to lyophilized bovine bone (Gen-ox), organic matrix) associated or not to GTR (Gen-derm). BACKGROUND DATA: A major problem on modern Dentistry is the recovery of bone defects caused by trauma, surgical procedures or pathologies. Several types of biomaterials have been used in order to improve the repair of these defects. These materials are often associated to procedures of GTR. Previous studies have shown positive effects of LLLT on the repair of soft tissue wounds, but there are a few on its effects on bone healing. METHODS: Surgical bone defects were created in 42 animals divided into five groups: Group I (control, 6 animals); Group II (Gen-ox, 9 animals); Group III (Gen-ox + Laser, 9 animals); Group IV (Gen-ox + Gen-derm, 9 animals); Group V (Gen-ox + Gen-derm + Laser, 9 animals). The animals on the irradiated group received 16 J/cm(2) per session divided into four points around the defect (4 J/cm(2)) being the first irradiation immediately after surgery and repeated seven times at every 48 h. The animals were humanly killed after 15, 21, and 30 days. RESULTS: The results of the present investigation showed histological evidence of improved amount of collagen fibers at early stages of the bone healing (15 days) and increased amount of well organized bone trabeculae at the end of the experimental period (30 days) on irradiated animals compared to non irradiated ones. CONCLUSIONS: It is concluded that a positive biomodulative effect on the healing process of one defect associated or not to the use of organic lyophilized bone and biological bovine lyophilized membrane on the femur of the rat.
Asunto(s)
Regeneración Ósea/efectos de la radiación , Trasplante Óseo/métodos , Terapia por Luz de Baja Intensidad/métodos , Animales , Regeneración Ósea/fisiología , Colágeno/biosíntesis , Colágeno/efectos de la radiación , Femenino , Fémur/efectos de la radiación , Masculino , Modelos Animales , Ratas , Ratas WistarRESUMEN
OBJECTIVE: The aim of this study was to histologically assess the effect of low-level laser therapy (LLLT) (lambda830 nm) on the repair of standardized bone defects of the femur of Wistar albinus rats grafted with inorganic bovine bone and associated (or not) with decalcified bovine cortical bone membrane. BACKGROUND DATA: Bone loss may be a result of pathology, trauma, or surgical procedure. Extensive studies on the process of bone repair have been undertaken, and several techniques for the correction of bone defects have been proposed. Amongst them is the use of several types of grafts, the use of membranes, and the combination of both techniques. There is evidence in the literature of the positive effect of LLLT on the healing of soft tissue wounds. However, its effect on bone healing is not completely understood. MATERIALS AND METHODS: Five randomized groups were studied: group I (control); group IIA (Gen-ox); group IIB (Gen-ox + LLLT); group IIIA (Gen-ox + Gen-derm); and group IIIB (Gen-ox + Gen-derm + LLLT). Bone defects were created at the femur and were treated according to the group. The animals of irradiated groups were irradiated every 48 h for 15 days; the first irradiation was performed immediately after the procedure. The animals were irradiated transcutaneuosly at four points around the defect. At each point, a dose of 4 J/cm2 was given (phi approximately equal to 0.6 mm, 40 mW), and the total dose per session was 16 J/cm2. The animals were humanely killed at 15, 21, and 30 days after surgery. The specimens were routinely processed to wax, serially cut, stained with H&E and Picrosirius stains, and analyzed under light microscopy. RESULTS: The results showed more advanced repair of the irradiated groups when compared to the non-irradiated ones. The repair of the irradiated group was characterized by both increased bone formation and on the amount of collagen fibers around the graft within the cavity, as early as the 15th day after surgery, considering the osteoconductive capacity of the Gen-ox and the increment of the cortical repair in specimens with Gen-derm membrane. CONCLUSION: It is concluded that LLLT had a positive effect on the repair of bone defect by graft associated or not with the use of biological membrane.
Asunto(s)
Regeneración Ósea/efectos de la radiación , Trasplante Óseo/métodos , Terapia por Luz de Baja Intensidad/métodos , Animales , Bovinos , Femenino , Fémur/efectos de la radiación , Masculino , Ratas , Ratas WistarRESUMEN
Cirurgiões-Dentistas estão sujeitos a sofrerem ínumeras injúrias, durante a prática odontológica, dentre elas está o risco de adquirir doenças infecto-contagiosas devido ao constante contato com sangue, fluídos eoutros tecidos possivelmente contaminados. Relatos prévios apontam atitudes que favorecem a infecção cruzada, bem como comportamentos discriminatórios que prejudicam a relação paciente-profissional. Neste estudo utilizou um questionário para avaliar os conhecimentos dos alunos de odontologia da Universidade Federal da Paraíba com relação a aspectos gerais das infecçõespelos HIV e VHB, bem como a disposição dos alunos em realizarem atendimento em pacientes com doenças infecto-contagiosas. Os resultados mostraram deficiência no conhecimento das vias de transmissão e meios de prevenção, principalmente da Hepatite B, onde 27,2 por cento relataram saber as formas de prevenção; e 68,6 por cento e 54,4 por cento dos estudantes mostraram-se dispostos a atender pacientes com HIV e VHB respectivamente. Assim, percebeu-se que a maioria dos alunos não possui posturas discriminatórias; porém, o repasse de informações básicas como transmissão e prevenção de doenças infecto-contagiosas, principalmente da Hepatite B precisam ser reavaliadas