There has been a significant increase in availability of the types of breast implants in recent years.   These can be saline of silicone filled, shaped or round, textured or smooth, and may have different profiles or projections. Each has its advantages (and disadvantages).  Saline filled implants have been available for many years, even through the moratorium on silicone filled implants.  These are filled with salt water and are unlikely to cause any local or systemic health concerns if there is a leak.  A deflation is relatively easy to detect clinically and does not require any specialized testing such as an MRI (magnetic resonance imaging study).  They may be placed through a smaller incision meaning a smaller scar.  And they are less costly.