bonded amalgs are basically 'glued in' ie you pack the amalgam onto a very thin layer of self setting bond (adhesive). To be honest its a technique that is more useful / essential on very large fillings as it reduces the need for pins or extra grooves cut into the tooth for mechanical retention of the filling (pins and groves can weaken the tooth and pins will casue stresses in the tooth structure).
So if its a small filling no real need to bond them in, but if you ask your dentist i'm sure he'll be able to sort it out for you if necessary. Although there are some dentists who charge extra for this! Not me as i'm nice and it only takes an extra minute or so to do
Theres also other alternatives to large white flgs you might not be aware of - porcelain or coposite inlays. These are stronger and are made in the lab with better materials, but cost quite a bit more depending on quality (eg the CNC milled or cast ceramics like Lava or Empress)
Hard to give you the best advice on here really as it all depends on the size and position in of the fillings, but PM me if you want more info. Although i'm out riding tonight so might be late by the time i reply!