HI !
As everyone has said- may take time.
However if your dorsal fragment was an avulsion type injury in which the conjoint part of the extensor mechanism tears off a chunk of bone, if that is not sticking back down with a splint - (? is it a finger spica splint?) after ten weeks then maybe a repair is in order to either pin or suture tendon / tendon+ bony fragment.
Certainly if this is your dominant hand and it is still deformed I would be approaching the Ortho again.
http://www.eorthopod.com/images/Cont...et_intro01.jpg