Is it possible to get a dental filling to support broken tooth that already has a big filling?

Description: What you described is a tooth that needs a crown. You know it you just dont want to hear it.

Temporarily, maybe: Large fillings have a tendency to fail if not supported by enough tooth structure. Sometimes a temporary filling can be placed to buy a little more time before a definitive restoration is placed...Usually a crown.

Yes: Yes, but depends on how much supportive tooth remains, for it to be a good idea. A crown may be needed.

2 Steps: 1) clean out the decay. Then bond the internal fractures and place a filling (core structure) within this tooth. 2) construct a crown for this tooth.

Yes, but not always: Yes, depending on how much tooth structure is missing. If the tooth still has a fair amount of tooth structure left, then you can get away by placing another filling, but if not, then you need a crown. But be aware that even if you place a filling, there might still be a chance that it may fracture and you may need a crown. If finances allows you to get a crown then that would be ideal choice.