The dermabrasion helped to reduce the pores to some degree.
Scarred skin was removed from my chin, cheeks, temples and forehead - but not my nose. The new healthy skin definately had nice tight pores but my nose still had some large ones.
In my opinion, I would credit accutane with keeping the new skin with small pores - I went on two rounds after the dermabrasion.
Also, I use Retin A daily. I believe it has helped my skin to be less oily.
I have less break outs, and the fine lines are kept to a minimum.
I had the dermabrasion 10 years ago. I know that doctors are focusing on lazers rather than surgery to improve acne scars. I'm not sure if it is being used anymore.
I hope my info helps.