There is a chance that the wisdom tooth may close a diastema ?

Don't count on it: Sometimes wisdom teeth can erupt in such a poor alignment that it can crowd the teeth in front of it. But to hope that the force would close a diastema (space between other teeth,) notably the front two upper or lower teeth, is not a high probability.

Unlikely: Unlikely. See orthodontist for advice about diastema. See oral surgeon for advice about wisdom teeth

No Chance: However, there will be no problem getting your braces to close the diastema, on 2 weeks after removing your wisdom teeth. Ask your orthodontist for more information.