How do 450cc implants last over time? (Photos)

Great question!  Implant selection can be a tricky process and without measurements, can be hard to discuss.  One of the more important factors is the width of your chest, and you want to pick and implant that is very close to this.  The higher projection you go, the more narrow the implant become if you compare the same cc's.  So a 450cc moderate projection will look different that a 450cc high projection.  It seems like your body could hold a 450cc implant but only with a physical examination in person so that measurements can be made would give you a definitive answer. Best of luck and hope this information helps!
- Dr. Roger Tsai  @DrRogerTsai
Board Certified Plastic Surgeon

hello thank you for your question and provided information as well.. based in your question and the picture you showed you are a good candidate for breast augmentation with implant ., in your case its recommended get a consultation in personal with a plastic surgeon to determinate how many cc do you need to get a very well result.

Thank you for the good question. It is not necessarily that larger implants are more problematic;  it is that the use of a breast implant  that is TOO  large for a patient's frame can be problematic.  
Generally speaking, every patient undergoing breast augmentation surgery should understand that their anatomic starting point will limit the outcome of breast augmentation surgery.    In other words, a patient's starting anatomy will limit how large of a breast implant can be utilized safely. The use of a larger breast implant (than what is safely "allowed" by the patient's anatomy) can be problematic;  potential problems include breast implant displacement/malpostion issues ( such as bottoming out, lateral displacement, symmastia...)  and/or significant breast implant rippling/palpability.
Generally, in my practice, I suggested patients aim for an outcome  only as large as "necessary" to make them happy; pushing the envelope can be problematic.  Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery ( regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. For example, I have found that the use of know words such as “natural” or "C or D cup” etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup size may also be inaccurate. Again, the use of computer imaging has been very helpful during the communication process, in our practice.
3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery, after the use of temporary intraoperative sizers.
I hope this helps. Best wishes for an outcome that you will be very pleased with.