Depending on where the edge has been worn, you replace the edge up to the purfling. In the chinrest area or the upper bout treble side, it may have to be replaced by an L-edge which secures the edge underneath at the same time. To do an L-edge, the front needs to be removed.
Iris Carr Restorations 
Just like new, Dr. Carr!
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What can you do to for a violin that has the edge shorn off all the way to the purfling? (below the bout)
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Depending on where the edge has been worn, you replace the edge up to the purfling. In the chinrest area or the upper bout treble side, it may have to be replaced by an L-edge which secures the edge underneath at the same time. To do an L-edge, the front needs to be removed.
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https://iriscarrrestorations.com/2022/09/27/replacement-edge-2/
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https://iriscarrrestorations.com/2022/01/28/new-edge/
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