Are the effects of micro needling different on stretch marks? I know if you need to maintain wrinkles

Hello Cmaala89,
Yes, Microneedling to improve the appearance of stretch marks is permanent on the scars treated. Usually a minimum of 4-6 treatments is required to see the best improvement. I do recommend using PRP during your treatment to aid in quicker healing and optimal results! 
Hope this helps,

Yes, if you are one of the lucky ones to receive an excellent outcome, its yours to keep. Unless you re-stretch your skin. So the results are indeed permanent. 
See the weblink below for all the answers on stretch marks, including the best creams and treatments.

New stretch marks are easier to treat than older ones. For new stretch marks (red-purple-pink), my treatment of choice is V BEAM vascular laser combined with compounded Vitamin A creams or a cream called Stratamark. This can reduce stretch mark colour and width by up to 50% or more. 

Old stretch marks are harder to treat- my preferred option for old, white, silvery- papery stretch marks is a combination of CO2 fractional laser, or with INFINI RF and PRP. I also use Fraxel ReStore 1550, and also lasers in the 1440 to 1540 wavelength. Of all the methods I find microneedling with RF energy and PRP the best, as it has the lowest rate of skin colour changes, and the fastest healing time. Results wise, it outperforms CO2 laser! Still not a miracle cure.

The truth is that stretch mark treatments are HIGHLY variable, depending on your own immune system, your skin type and the age of the stretch marks. Some get a 30% improvement, others up to 80%. Regardless of the treatment multiple sessions are need – anywhere from 3 to 8 sessions. An assessment is the very first step. Regards,

Dr Davin Lim, Laser and aesthetic dermatologist.

Brisbane, Australia. 

Stretch marks result from damaged skin, and in essence are scar tissue.  The effects of microneedling to stretch marks is largely permanent, unless you re-injure the skin.
I usually recommend 3-6 sessions, with or without laser treatment depending on pigmentation.
Good luck to you,
Dr. Powell