In the 1980s, the models of the Third and of the Fourth generations of breast implant devices were sequential advances in manufacturing technology, such as elastomer-coated shells that decreased gel-bleed (filler leakage), and a thicker (increased-cohesion) filler gel. Sociologically, the manufacturers of prosthetic breasts then designed and made anatomic models (natural breast) and shaped models (round, tapered) that realistically corresponded with the breast- and body- types of women. The tapered models of breast implant have a uniformly textured surface, which reduces the rotation of the prosthesis within the implant pocket; the round models of breast implant are available in smooth-surface- and textured-surface- types.
2000	European Union	European Committee on Quality Assurance & Medical Devices in Plastic Surgery (EQUAM)	"Additional medical studies have not demonstrated any association between silicone-gel filled breast implants and traditional auto-immune or connective tissue diseases, cancer, nor any other malignant disease. . . . EQUAM continues to believe that there is no scientific evidence that silicone allergy, silicone intoxication, atypical disease or a 'new silicone disease' exists."[34]

2. You buttock's structural anatomy is also an important factor.  A V-shaped buttock typically requires more fat transfer to achieve a satisfactory improvement than an A-shaped buttock.  Transferred fat cells need to grow their own blood supply from the surrounding buttock tissues in order to survive.  In order for this to happen, the transferred fat cells need to be gently interwoven between your buttocks' living cells to survive.  Therefore, each person's buttocks can only receive a certain amount of fat, and exceeding that amount will not be effective.  A generous amount of fat is typically transferred at the time of surgery, knowing that some of the fat will go away during the recovery period.
The woman wanting a lift is usually slightly different. She had breasts she was happy with before, she had loving kids who she may or may not have breastfed, exercised and had a good life. They come wanting to restore the youthful breast they once they had(or better), they hate that it is slightly more deflated than before and it's slightly more south then they'd like. The formal name of this operation is "Mastopexy" and that's why you hear terms like "Mastopexy augmentation" because often in order to restore the youthfulness of the breast you not only need to reposition the nipple/areolar complex "up" with a mastopexy, you also need to provide some additional volume with an implant, hence augmentation as well. The discussion with implant also is entirely different discussion all together, but this highlights the primary difference in the reduction and a lift.

Case 39: The facial plastic surgeons at PROFILES Beverly Hills tailor every Rhinoplasty to achieve just what you are looking for. Sometimes, the most subtle of changes take just as much effort as the most dramatic ones. This pretty model didn’t want to drastically change her look. Her Los Angeles Finesse Rhinoplasty gave her the refinement she wanted, especially on her front and three-quarter views. Along with fat transfer to the lower eye area, her overall look was softened to make her that much more camera ready.
In general, silicone-gel-filled implants are smoother, softer and feel more like natural breast tissue than their saline-filled counterparts. Silicone implants feel like a semisolid gel, while saline implants are often likened to water balloons. Silicone-gel implants are also less likely to wrinkle and ripple than saline breast implants. Wrinkling is actually considered one of the major disadvantages of saline implants. The thinner the woman and the less breast tissue she has, the more likely the saline implant's crinkles and wrinkles will be felt and even seen.
Breast reduction involves reducing the size of the breast. A breast lift involves lifting the nipple-areolar complex and reducing the excess skin of the breast. Breast reductions can involve just liposuction in patients who have more fatty tissue than glandular breast tissue. Liposuction alone indeed does reduce the volume of the breasts. However, sagging of the breast can result and liposuction alone is therefore performed usually in highly selected patients.
In the early 1990s, the national health ministries of the listed countries reviewed the pertinent studies for causal links among silicone-gel breast implants and systemic and auto-immune diseases. The collective conclusion is that there is no evidence establishing a causal connection between the implantation of silicone breast implants and either type of disease. The Danish study Long-term Health Status of Danish Women with Silicone Breast Implants (2004) reported that women who had breast implants for an average of 19 years were no more likely to report an excessive number of rheumatic disease symptoms than would the women of the control group.[26] The follow-up study Mortality Rates Among Augmentation Mammoplasty Patients: An Update (2006) reported a decreased standardized mortality ratio and an increased risk of lung cancer death among breast implant patients, than among patients for other types of plastic surgery; the mortality rate differences were attributed to tobacco smoking.[27] The study Mortality Among Canadian Women with Cosmetic Breast Implants (2006), about some 25,000 women with breast implants, reported a 43 per cent lower rate of breast cancer among them than among the general populace, and a lower-than-average risk of cancer.[28]
After reviewing the medical data, the U.S. Food and Drug Administration concluded that TDA-induced breast cancer was an infinitesimal health-risk to women with breast implants, and did not justify legally requiring physicians to explain the matter to their patients. In the event, polyurethane-coated breast implants remain in plastic surgery practice in Europe and in South America; and no manufacturer has sought FDA approval for medical sales of such breast implants in the U.S.[93]
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