What is the Cc and Cup Size after a surgery with 280 grams with diameter 116mm

Generally you can average a cup to be between 150-200cc. Given the size of 280gm you are going from 1.5-2 cup sizes up which would end you near a D cup.
Clearly there are many other factors that go into this which makes this an inexzact science.
For example, the 34 is a band width and roughly measures your boney skeleton. Your band width should theoretically not change but in reality it likely will. Therefore it is more likely you will be a 36D for two primary reasons:
Women tell me that it is very difficult to find a 34D unless specially ordered.
Women generally feel more comfortable going up a band width.

The cup size depends on your chest diameter. Therefore, the same cc or implant size will lead to different cup sizes in different people. If you have a large chest diameter, then the same implant will have a lower cup size than someone with a smaller chest diameter.