RESUMO
PURPOSE: To evaluate the effect of implant osteotomy on immediate bone cell viability, comparing guided surgery for implant placement with the classic drilling procedure. MATERIALS AND METHODS: For this study, 20 rabbits were used. The animals were divided into a guided surgery group (GG) and a control group (CG) and were then divided into 4 subgroups--subgroups 1, 2, 3, and 4--corresponding to drills used 10, 20, 30, and 40 times, respectively. All animals received 5 osteotomies in each tibia, by use of the classic drilling procedure in one tibia and guided surgery in the other tibia. The osteotomized areas were removed and processed immunohistochemically for detection of osteocalcin, receptor activator of nuclear factor κB ligand (RANKL), osteoprotegerin (OPG), and caspase 3. RESULTS: Immunohistochemical analysis showed that osteocalcin expression was initially higher in the CG and remained constant after drill reutilization. Although the expressions of RANKL and OPG were not statistically different for the GG and CG, the RANKL/OPG ratio tended to be higher for the GG. Moreover, caspase 3 expression was elevated in the GG, proportionally to the number of osteotomies, indicating an increase in the apoptosis index in the GG. CONCLUSIONS: The classic drilling procedure is more favorable to cell viability than guided surgery.
Assuntos
Osso e Ossos/citologia , Implantação Dentária Endóssea/métodos , Cirurgia Assistida por Computador , Animais , Osso e Ossos/metabolismo , Caspase 3/biossíntese , Caspase 3/genética , Sobrevivência Celular , Implantação Dentária Endóssea/instrumentação , Temperatura Alta/efeitos adversos , Masculino , Modelos Anatômicos , Osteocalcina/biossíntese , Osteocalcina/genética , Osteoprotegerina/biossíntese , Osteoprotegerina/genética , Ligante RANK/biossíntese , Ligante RANK/genética , Coelhos , Cirurgia Assistida por Computador/efeitos adversos , Tíbia/cirurgia , Tomografia Computadorizada por Raios XRESUMO
PURPOSE: The aim of this study was to evaluate the satisfaction of patients rehabilitated with zygomatic fixtures and prosthesis with immediate loading. MATERIALS AND METHODS: The study selected patients who were rehabilitated with zygomatic implants at the clinic of the Latin American Institute for Dental Research and Education (ILAPEO. Curitiba-PR. Brasil) between 2005 and 2009. The patients were asked to answer a control-questionnaire during their follow-up visits. Data were collected regarding the level of patient satisfaction, reason for dissatisfaction, number of post-operative clinical sessions, and the type of complication. Sixteen patients were selected: 10 females and 6 males. RESULTS: Half of the patients were completely satisfied while the other half were satisfied with some complaints. The complaints were related to hygiene, esthetics, phonetics, and discomfort during chewing. Regarding the post-operative evaluation, 50% of the patients were attended due to the prosthesis (62.5%) and the implant (37.5%). CONCLUSIONS: The treatment with zygomatic fixtures is predictable and reliable. The patients were satisfied both with implants and prosthesis.