Choosing a breast implant is a clinical decision with long-term consequences. An implant placed in the body may remain for 10–20 years or more. This article reviews the common implant types from a clinical perspective, not from any manufacturer's marketing angle.
A note: the right choice for any individual depends on breast anatomy, desired size, breast and skin thickness, and lifestyle — it can only be decided after an in-person assessment. This article provides a knowledge frame so that patients enter consultation with more confidence.
Implant types by filler material
Saline
A silicone shell filled with sterile saline. The implant is placed empty and filled in the pocket, allowing a smaller incision. If it ruptures, the saline is absorbed harmlessly — a safety advantage. Disadvantages: a less natural feel than gel, and rippling at the upper or outer pole, particularly in thin patients with little breast tissue. Less commonly used in Vietnam and Asia than gel.
Cohesive silicone gel
Currently the most common type. A silicone shell contains cohesive gel — a cross-linked silicone that holds its shape even if the shell is breached. Several generations exist: fourth-generation gel is softer, fifth- and sixth-generation gel is firmer ("highly cohesive"). Feels more natural than saline. Disadvantages: if the shell ruptures, gel can migrate into surrounding tissue ("silent rupture") — requiring periodic imaging surveillance (ultrasound or MRI).
"Gummy bear" (form-stable, highly cohesive)
A specific subtype of cohesive gel with very firm cross-linking — called "gummy bear" because the gel holds its shape when cut. Typically anatomical (tear-drop) rather than round. Gives a more natural projection in the upright posture. Requires correct orientation (marked) — rotation in the pocket can distort the breast. Suited to specific cases needing pronounced natural shape; not a default choice for every patient.
Implant shell: smooth vs textured
This is important but often under-discussed with patients:
- Smooth: the implant can rotate naturally in the pocket. Some studies report a slightly higher capsular contracture rate. Not linked to BIA-ALCL on current data.
- Textured: a roughened surface allows tissue ingrowth, holding the implant still — important for anatomical implants that need to stay oriented. Linked to BIA-ALCL at a low rate; some specific textures have been recalled.
Shell choice depends on implant type (round vs anatomical) and an individual risk-benefit assessment. This is a key consultation discussion.
Shape: round vs anatomical
Round implants
Symmetric round shape. Upright, the upper pole is fuller — suits patients who want a pronounced upper pole. No orientation requirement. Rotation in the pocket does not change shape.
Anatomical (tear-drop) implants
Fuller at the lower pole, tapered above — mimicking the natural shape of an upright breast. Suits patients who want a pronounced natural shape. Requires correct orientation. Rare in-pocket rotation can distort the shape — requiring revision.
Size and base diameter
Implant size is not "cup size" in the way patients often imagine. Implants are measured by volume (cc — millilitres) and base diameter. A responsible surgeon will:
- Measure breast base diameter and chest width to match the implant to anatomy.
- Warn when a patient's desired size exceeds what the tissue will support — oversized implants risk stretch marks, back pain, tissue thinning, and earlier ptosis with age.
- Decline to promise a specific "cup size", because cup depends on under-bust measurement and bra fabric.
The question "how many cc" should follow the question "what does your chest and tissue allow". A surgeon who agrees immediately to whatever size you request without discussing base diameter is signalling something worth pausing on.
Implant position
- Subglandular: above the pectoralis major, beneath the gland. Faster recovery, less pain. But the implant edge can be visible in thin patients with little breast tissue.
- Submuscular (or dual-plane): partly or fully below the pectoralis major. The muscle hides the edge, more natural in thin patients. More painful for the first few days, longer recovery. Can produce "animation deformity" (breast movement on muscle contraction) — not suited to heavy gym training.
Frequently asked questions
Do breast implants "expire"?
Implants do not have a fixed expiry, but they are not "permanent" either. The probability of needing revision or exchange increases with time. Most patients do not need exchange at 10 years if no complication arises — but periodic surveillance is needed to catch problems early.
Is saline safer than gel?
A nuanced answer. Saline has the advantage that rupture is recognised quickly (the breast deflates) and the saline is absorbed harmlessly. Cohesive gel feels more natural but a "silent rupture" needs imaging to detect. Both are approved for clinical use by the FDA and other regulators.
Can I breastfeed after breast augmentation?
Most women can. The inframammary or axillary approach preserves ductal anatomy best. The periareolar approach has a slightly higher risk of affecting lactation. Discuss the incision choice if future breastfeeding is important to you.
Do implants raise breast-cancer risk?
The current literature does not show that breast implants increase the risk of conventional breast cancer. There is a very low risk of BIA-ALCL associated with certain textured implants — a different disease from breast cancer. Mammographic screening may need special technique in the presence of implants — inform the radiologist.
Can I do gym training with implants?
Yes. With submuscular implants, however, strong pectoral activity (push-ups, bench press) can produce "animation deformity" — visible distortion on muscle contraction. This is not dangerous but may not be cosmetically desirable. Heavy gym patients are often advised to consider subglandular or dual-plane positioning to reduce this.