RESUMEN
AIM: The aim of the present retrospective study was to evaluate the long-term results of tooth autotransplantation using the survival and success rates of transplanted teeth as outcome variables. METHODS: Thirty patients received a total of 44 transplants of immature teeth from 1987 to 1997. Seventeen of those patients with 25 transplants were recalled 10-20 years after tooth transplantation for complete clinical and radiographic examinations, followed by questionnaires that examined the patients' degrees of satisfaction. The incidence of all types of complications was carefully analyzed. Success was defined as being free of all complications over the entire observation period. RESULTS: The long-term survival rate for transplants that were observed after at least 10 years was 96%. The cumulative complication rate (pulpal, periodontal, and operative complication rates) after an observation period of 10-20 years was 38.9%. Therefore, the success rate at 10 years was 61.1%. CONCLUSION: The present study confirms that transplanted teeth have a high long-term survival rate and a lower long-term success rate. This procedure should be recommended and carried out in appropriate patients when necessary because it is the most biological approach, even though it is highly sensitive to technique.
Asunto(s)
Diente/trasplante , Trasplante Autólogo , Estudios de Seguimiento , Humanos , Estudios Retrospectivos , Resultado del TratamientoRESUMEN
Protein binding to implants is governed by the physicochemical properties of the biomaterial surface. The adhesion of a protein onto a solid surface is nonspecific. The aim of this study was to assess the adsorption process of fibrinogen at two different dental implants. The first biomaterial has a sand-blasted titanium surface, whereas the second one is covered by a calcium phosphate coating. After scanning electron microscopy and atomic force microscopy characterization of the implant surfaces, force spectroscopy has been used to determine the unbinding force of fibrinogen adsorbed at the two different substrates. Force-measurement findings indicate that the detachment force of fibrinogen adsorbed onto both surfaces varies as a function of the interaction time. The mean strength of the unbinding forces increases with the interaction time (100 and 1,000 ms, respectively). However, experimental data suggest that fibrinogen fixes to the two studied biomaterials by different mechanisms. Moreover, it appears that, after an interaction time of 1,000 ms, the detachment force of the adsorbed protein is quite larger for the titanium surface than for the calcium phosphate coating.