Contoured implants, also called anatomical or teardrop-shaped implants, are shaped like a natural breast and create a sloped shape when placed over the chest muscles. Round breast implants have that, well, "round" Victoria's Secret or Playboy model shape. Contoured implants may flip over if the surgeon does not create the pocket correctly, resulting in a misshapen breast. Not true with round implants. If a round breast implant flips, it still looks the same. Your decision on implant shape should be based on how you want your new breasts to look.
Buttocks fillers are typically not helpful for patients who have experienced massive weight loss since they cannot remove excess skin. They can be an effective, less invasive alternative to a Brazilian butt lift, but the materials required are often quite expensive, especially since they were developed for use in the face, which requires much smaller injections. In addition, most fillers require repeated treatment on a regular basis, increasing their cost and inconvenience over time.
A breast reduction typically includes a lift. However, a lift does not necessarily require a reduction. Both operations have similar incision patterns and resultant scars, but they have different indications. One of the first questions I ask a patient who desires an improved appearance of her breasts is if she would like to be the same size, smaller, or larger. The patient who wants to be the same size and is happy with her breasts when wearing a bra but unhappy with the amount of sagging without a bra is a candidate for a breast lift alone. The patient who desires to be smaller or has one breast noticeably larger than the other, is a candidate for a breast reduction-lift combination. Sometimes patients feel their breasts look smaller after removal of the excess skin with the lift even though no breast tissue was removed; the reason for this is that some of what fills your bra cup is excess skin. The patient with sagging who desires to have larger breasts is a candidate for a breast lift with implants.