The preferred way to resolve this is not by pulling the ceiling down and replacing it with drywall but rather to reattach the plaster ceiling to the supporting lath.
Repairing plaster ceiling cornice.
Then the rings required for the installation of the cornice are fastened to the beam.
Once this is done you can begin filling the cracks with a plaster mixture and paper tape to help with strengthening of the joint.
Use paint scraper to remove any loose paint or plaster along crack.
On the base plate of the ceiling you need to fix the bar its length should be equal to the cornice.
You may like to leave your cornice stripped for a distressed look but if you re planning to paint it use a basic matt emulsion.
Mix cornice cement in bucket to form a paste.
The repair of cracks begins with removing any loose plaster from within the cracks and making sure that any plasterboard is reattached to the walls and ceilings with nail clouts plaster screws or glue.
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In this video you will see a cornice which despite various attempts to simply patch over the crack it keeps coming back.
If you stripped the coving right back to the plaster then you ll need to apply a primer before you begin applying your emulsion.
Partially remove the ceiling cover or do the following as described below before installing it.
In this video i show how i repair damage to plaster coving.
The old way of doing this was by using plaster washers which are a larger wash the is screwed through the face of the plaster into the lath to mechanically support the plaster.
You will see how with this method it.
Apply the first coat leave to dry and then paint over with a second coat.
Once close to the cornice score the plaster at the front edge of the cornice a few times with a sturdy craft knife often the plaster breaks off cleanly and mostly flush with the cornice.