Partials and unders are the same thing, it’s just a different termnology. They used to place implants fully under the muscle years ago but given it caused a lot of issues this is no longer done. A partial placement is where the implant is placed under the muscle at the top portion and left over at the bottom, when you hear someone refer to unders, they do mean partials, it’s a little confusing but it’s all one and the same 🙂 So long story short – you either get full overs or partials. Hope this helps. x