Has Dermaroller same effect like fractional laser?
Definitely YES! But the mechanism of action of a fractional laser is totally different. A laser beam sets a burn wound that results in necrosis. After an inflammatory process the lasered proteins transform into fibrotic tissue in forms of micro scars. Only 20% of the skin can be fractionally lasered at a time. Therefore a minimum of 5 sessions must be anticipated.  Nerve cells are “melted” by the hot laser beam, therefore the treatment is relatively painful. As the physician cannot see the previous set scars under the epidermis in a follow-up treatment, it is extremely difficult for him to set an even scar pattern. This is the reason why more treatments are required as initially anticipated. But overall, as reported in clinical trials and besides costly investment in lasers, both therapies have about the same results in facial rejuvenation.