Will 300cc High Profile Silicone Be Too Wide for a Breast Tissue Width of 10.9cm?

It is very important to communicate your size goals with your surgeon.  In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as “natural” or “C cup” or "fake looking" means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup  size may also be inaccurate.
I use  intraoperative sizers and place the patient in the upright position to evaluate breast size. Use of these sizers also allow me to select the press implant profile (low, moderate, moderate plus, high-profile) that would most likely achieve the patient's goals. The patient's goal pictures are hanging on the wall, and allow for direct comparison.
I have found that this system is very helpful in improving the chances of achieving the patient's goals as consistently as possible.
By the way, the most common regret after this operation, is “I wish I was bigger”.
I hope this helps.

This is a relatively modestly larger than your breast diameter and most likely would be a reasonable option for your breast augmentation. Make sure to wear supportive bras during exercise. My patients often wear two jog bras at the same time.

Breast augmentation surgery is a very predictable and satisfying operation if the patient is well informed and educated. The choice of breast implant size is a very individual  decision with multiple variables, including skin quality, chest size, height and weight. The breast implant range you have selected sounds appropriate, but do not get hung up on a 0.2 cm base width discrepancy (look at 0.2cm on a ruler!) because in general base width is a very arbitrary measurement and depending on your breast envelope stretch should not contribute to a noticeable difference. You likely would do well with the 300cc breast implant based on what information you have included.

I hope this helps and let me know if you have any more questions.

Dr. Trussler