Cutting the gum to make room for a crown

I had a root canal 19 months ago but don't have the crown yet because my dentist says there isn't enough room to put it on. It's my back lower left molar, #18 I think. My wisdom teeth were removed many years ago. I have to see a specialist who will cut my gum, and I'm afraid maybe the bone too? The dentist said it will take 6 weeks to heal before he can put the crown on after. Is this surgery really necessary? Is there an alternative?

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