16/10/2026
“Dr, I’ve already extracted teeth. Why do I still need expansion?”
Sometimes, even after extractions, we may still need to create more space by expanding the arch.
There are 2 types of expansion: skeletal expansion and dental expansion.
For adults, the jaws have usually completed most of their growth, so conventional orthodontic expansion is mainly dental expansion—we move the teeth outward within the limits of the surrounding bone.
The important point is: teeth cannot simply be pushed outside the bone. There is a biological limit, determined by the thickness and boundaries of the supporting bone.
For growing children, we have another option: skeletal expansion. Because the jaw is still developing, we may be able to modify the width of the jaw and gain more space than with dental expansion alone.
So, expansion is not simply “making the teeth wider.”
The type of expansion, the patient’s age, growth potential, and the available bone all matter.
For this patient, there was severe crowding together with 2 missing upper lateral incisors.
We decided to use maximum dental expansion within the patient’s biological limits to gain as much space as possible and improve the alignment.
Every patient has a different limit—and knowing that limit is an important part of orthodontic treatment.
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