Implant Type · 1 of 5
Silicone gel breast implants
The dominant breast implant type in modern practice — over 95% of implants placed worldwide. Cohesive silicone gel filler with multiple shell, surface, and shape options across five major global brands.
Clinical summary
Silicone gel breast implants are filled with cohesive silicone gel. They feel more natural than saline, have lower rippling rates, and are the dominant choice in modern practice (over 95% of implants worldwide). Modern fifth-generation devices have substantial safety data across multiple decades. The main consideration vs saline is silent rupture — silicone rupture often produces no immediate symptoms, requiring MRI surveillance every 2-3 years. Five major brands available globally: Mentor, Natrelle/Allergan, Motiva, Polytech, Sebbin.
What silicone gel implants are
A silicone gel breast implant is a medical device with two parts:
- Outer shell — a silicone elastomer (rubber-like) envelope, typically with multiple layers (laminated structure for durability). Modern shells are 0.5-1 mm thick.
- Filler — cohesive silicone gel. The cohesiveness varies by manufacturer and product line — from moderately cohesive (softer feel, more natural movement) to highly cohesive ("gummy bear", form-stable, holds shape if shell is breached).
The outer shell can have different surface treatments (smooth, microtextured, macrotextured, polyurethane-coated — see surface reference) and different shape (round, anatomical, ergonomic — see shape reference). The fill material (silicone gel) is the same category across all of these — what varies is shell, surface, shape, and the specific gel formulation.
Five generations of evolution
| Generation | Era | Characteristics | Status |
|---|
| 1st | 1962-1970s | Thick shell, viscous gel; firm; high contracture rates | Obsolete |
| 2nd | 1970s-1980s | Thinner shell, less viscous gel; softer feel but bleed-through and rupture risk | Obsolete; subject of older safety concerns |
| 3rd | 1980s-1990s | Multi-layer shell, lower bleed; moratorium era in USA (1992-2006) | Obsolete |
| 4th | 1990s-2010s | Cohesive gel; lower bleed; texture variants developed | Largely replaced by 5th gen |
| 5th | 2010s-present | Highly cohesive gel; advanced shell barriers; form-stable options; refined surface technologies | Modern standard |
Implants used in 2026 are fifth-generation devices — substantially different from the 1980s and 1990s implants that drew historical safety concerns. Patient questions about "silicone implant safety" often reference older-generation data that does not reflect modern devices.
Advantages over saline
- Natural feel. Silicone gel mimics breast tissue density. In patients with thin overlying tissue, this is the most noticeable difference vs saline.
- Lower rippling rates. Saline implants ripple visibly in patients with less than 2 cm of overlying breast tissue. Silicone gel rippling is substantially less.
- More natural movement. Silicone gel responds to gravity and position more like natural breast tissue.
- Better aesthetic outcomes in thin patients. Patients with low BMI or minimal breast tissue have better results with silicone gel due to reduced visibility of implant edges.
- Modern cohesive variants maintain shape if rupture occurs. Older silicone gel could leak; modern cohesive gel stays in place.
Important considerations
Silent rupture and surveillance
The major consideration with silicone gel: rupture often produces no immediate symptoms. The cohesive gel typically stays within the capsule (the scar tissue surrounding the implant), so no visible deflation occurs. The patient may never know rupture has happened without imaging surveillance.
- FDA recommendation: MRI screening 5-6 years after implantation, then every 2-3 years.
- Alternative imaging: high-resolution ultrasound is increasingly accepted as an alternative to MRI for surveillance — less expensive, more accessible, and validated in recent studies for detecting silicone implant rupture.
- Symptoms that warrant evaluation: new asymmetry, change in implant position or shape, new pain, palpable masses or lumps, capsular contracture changes.
BIA-ALCL (texture-related cancer)
Breast implant-associated anaplastic large cell lymphoma (BIA-ALCL) is associated specifically with macrotextured implant surfaces — not with silicone gel filler itself. Smooth-surface and microtextured silicone gel implants have substantially lower or undetectable BIA-ALCL risk in current data. See dedicated BIA-ALCL page for current evidence.
Breast implant illness (BII)
BII refers to a constellation of self-reported systemic symptoms (fatigue, brain fog, joint pain, autoimmune-type symptoms) that some patients attribute to their implants. The current evidence base is mixed — symptoms are real for affected patients but causal attribution to implants is not consistently established by controlled studies. See breast implant illness page for the current evidence overview and informed consent considerations.
Brand-specific differences
Five major silicone gel implant brands available globally in 2026. Each has multiple product lines with different gel cohesiveness, shell properties, and surface treatments:
Who silicone gel suits
| Patient profile | Silicone gel suitability |
|---|
| Most adult women seeking augmentation | Strong candidate |
| Thin overlying breast tissue (less than 2 cm pinch) | Strongly preferred over saline (less rippling) |
| Mastopexy + augmentation combination | Standard choice |
| Revision after saline | Common upgrade reason |
| Patients explicitly requesting saline (immediate rupture detection) | Saline alternative discussed |
| Country regulatory restrictions (e.g., USA under-22 cosmetic) | Saline alternative for under-22 cosmetic in USA |
Frequently asked questions
Are silicone gel implants safe in 2026?
Yes — silicone gel implants are FDA-approved and have been studied extensively across multiple decades. Modern fifth-generation cohesive gel implants from Mentor, Allergan, Motiva, Polytech, and Sebbin have substantial safety records. The gel formulation has improved significantly since the 1990s when older devices led to safety concerns. Modern implants do not 'leak' silicone into surrounding tissue if intact, do not cause systemic illness in the vast majority of patients, and have low complication rates with proper surgical technique. Specific concerns (BIA-ALCL, breast implant illness) are addressed on dedicated pages with current evidence.
How is silicone gel different from cohesive gel?
Cohesive gel is a type of silicone gel — all cohesive gel implants are silicone, but not all silicone gel implants are highly cohesive. The 'cohesiveness' refers to how well the gel holds together. First-generation silicone gel was liquid-like and would leak if the shell ruptured. Modern fifth-generation cohesive gel ('gummy bear') maintains its shape if the shell is breached — the gel does not flow out. Most modern silicone implants are at least moderately cohesive; the highly cohesive form-stable variants are typically marketed as 'cohesive gel' or 'gummy bear' implants.
Can silicone gel implants rupture silently?
Yes — this is the major concern with silicone gel and the reason for routine MRI surveillance. Saline rupture is immediately obvious (the saline absorbs and the breast deflates within hours). Silicone gel rupture often produces no immediate symptoms — the cohesive gel stays in place, sometimes within an intact capsule. FDA recommends MRI screening 5-6 years after implantation, then every 2-3 years. Modern cohesive gel implants reduce the consequences of rupture (gel does not migrate freely), but surveillance is still recommended.
Do silicone implants feel different from saline?
Generally yes — silicone gel implants feel more like natural breast tissue. Saline implants feel firmer and may have a more 'sloshing' or fluid quality, especially in patients with thin overlying breast tissue. The difference is more noticeable in thin patients with less breast tissue covering the implant. In patients with substantial overlying breast tissue, the difference can be subtle. For most patients prioritising natural feel, silicone gel is the preferred choice — and is the dominant selection in modern practice (over 95% of implants placed worldwide).
How long do silicone gel implants last?
Modern silicone gel implants are not 'lifetime' devices but are not on a fixed replacement schedule. Average lifespan: 15-20 years for modern silicone gel in clinical studies. Some implants last 25-30+ years; some require replacement at 10-12 years due to capsular contracture, rupture, or patient preference for size change. Most manufacturer warranties cover rupture replacement free of charge for 10 years (some longer). The decision to replace is clinical (rupture, contracture, deformity) or preferential (size update), not calendar-based. MRI surveillance every 2-3 years detects silent rupture before symptoms develop.
Are silicone gel implants approved in my country?
Yes in essentially all developed markets — USA (FDA), EU (CE mark), UK (MHRA), Australia (TGA), Canada (Health Canada), all Scandinavian countries, all major Gulf states. Specific brand availability varies by country (Allergan/Natrelle BIOCELL macrotextured implants were recalled in 2019, but smooth and microtextured Natrelle Inspira lines continue to be widely available globally; Motiva is a major global brand; Mentor MemoryGel is widely available; Polytech is dominant in Germany; Sebbin in France; Nagor in UK). Brand-specific availability is part of the consultation discussion.
Related references