public DataModel<ExameBean> listaExames() {
        ExameDAO exame = new ExameDAO();
        if (exame.getExames() != null) {
            examesBean.removeAll(examesBean);
            for (ExameDAO e : exame.getExames()) {
                examesBean.add(new ExameBean(e.getIdExame(), e.getNome(), e.getValor()));
            }
            return new ListDataModel(examesBean);
        }
        return null;
    }