The separation of the nasal bridge is called an open roof deformity. Osteotomies will have to be performed to close the open roof deformity. This is the only way the separation of the nasal bridge can be corrected.
It sounds like you're describing an open roof deformity, which can be corrected with revision surgery. This is an unusual problem after correction of a deviated septum, but see a surgeon with experience in rhinoplasty revision surgery.
I do not know what you are referring to for a septoplasty is done to correct breathing problems and is separate from a rhinoplasty which would be for the outside of the nose. If there is a separation of the nasal bones, then it probably needs a more complete infracture or rebreaking of the bones which should correct it.
Correction of Nasal Bridge Defect After Septoplasty
The separation at the bridge of your nose can be corrected. Consult with a few experienced and skilled rhinoplasty surgeons before carefully choosing the surgeon to correct your deformity.
Good luck and be well.
Yes this can be corrected. You should see an experienced revision rhinoplasty surgeon as to the cause and possible ways to correct the problem. If it is only a dent, it can be repaired with a graft from your septum.
Rarely the outside of the nose can change after septoplasty
I usually tell my patients that Septoplasty is only for the inside of the nose and breathing. There should be no external changes. However, I have seen a number of patients operated on elsewhere who have had dents and even fallen nasal tips. This has to do with weakening of the septal cartilage. What works for most patients may not for some. These changes can be surgically corrected using grafts of your own cartilage.
Pretty much anything can be corrected or improved in the nose but the important issue is diagnosis and planning. Without pictures or examination its impossible to determine what you mean by a separated bridge. If there is a separation between the bony and cartilagenous part of the bridge then that can be corrected with Spreader grafts and dorsal onlay grafts. The first thing is examination.