Which one is safer and permanent in a butt? A silicon Implants or a Fat Transfer?

To pick one over the other with regard to safety isn't really possible as each carries different risks.  The risk of infection with insertion of an implant (which would require removal) is greater than the infectious risk with fat transfer.  With regard to permanence of your result, you should achieve that with both but may note fluctuations with the fat transfer (Brazilian Butt Lift, BBL) technique.  The size of your implant won't change.  Your initial result after a BBL may regress somewhat in the early postoperative period as some of the fat will inevitably not survive the transfer.  I think the most imperative question, however, is what is best for your individual physique.  Silicone implants do an excellent job of enlarging and reshaping the buttocks, but the remainder of the body is left unchanged.  With a BBL you are afforded the very significant advantage of reducing and redefining the waist with liposuction.  By reducing the circumference of your waist and increasing the circumference around your hips/butt at the same time, you greatly improve your waist to hip ratio.  Bringing this ratio to an "ideal" proportion will give you the feminine, curvy figure that you are likely seeking.  However, having a BBL is entirely contingent upon the availability of fat.  If you are very thin, it is possible that you may have no option other than an implant-based buttock augmentation.  This would mean that you already have petite waist and only need to increase the hip/buttock circumference to get the proportion you desire.

Hello Mandy,A BBL requires a significant amount of fat to be transferred to the buttock to achieve projection and along with aggressive liposuction of the lower back and hips a beautiful buttock contour can be achieved.  Concerning safety, this procedure does not involve any foreign body as it is completely your natural fat.  Buttock implants can still have some benefit in very slim women who do not have enough fat to transfer, but can have a very high complication rate including infection, chronic pain and rotation. If you are very slim and not a candidate for a BBL, I recommend making sure to find a very experienced plastic surgeon who has placed a number of buttock implants and is aware of how to care for any associated complications.Best of Luck!Dr. Rednam

I would recommend fat grafting over implants.  I have abandoned the use of implants for buttock augmentation due to the high complication rate.  Fat grafting works so much better and has long lasting natural results.