Both silicone and saline breast implants come in a variety of widths, volumes and shapes. The most important consideration for anyone considering augmentation is the base width of their breast, taking into consideration the "normal" 2 - 3cm of cleavage distance and a desired slight projection of the breast past the line of the chest. A breast implant with a width close to the width of the breast will give a proportional augmentation. Once the width is correct, different volumes and different projections can be considered.
Many websites will have before and after photos with the person's height, weight, implant size, age and child bearing history. Finding as close a match as possible to you will allow you to gauge approximately the results you can expect. Too large an implant will not only look out of proportion but will have predictable adverse effects on the chest skin over time. It is also highly beneficial to visit your board certified plastic surgeon and try on different sizers to see if the choice you had in mind works for you.
