This is a much often asked question after silicone rhinoplasty when patients want to 'touch up' or improve and refine their results.
In a silicon augmentation rhinoplasty, the body forms a capsule around the silicone implant. As the silicone implant is a foreign material it does not have a blood supply and if there is an infection, it is likely that the implant will need to be removed. This is in contrast to total autologous rhinoplasty where your own tissues are used. Over time, blood supply ingrowth will penetrate these tissues and once the tissue has healed it will have the ability to resist infections and will not have the problems of a foreign body infection
Fillers injections are certainly safe when done by well-trained professionals but it still carries with it a possibility of infection. In the scenarios when you develop infection after the fillers are injected around the capsule or within the capsule of the silicone implant, you would most certainly need to remove the implant. Hence, I would not recommend having filler injections to the nose after rhinoplasty, especially when you have a silicone implant.