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Please guys, don't argue over me!
It's helpful to know about the different alternatives, which is what I asked, and I do actually feel happier about the idea now. The crown is still sitting nicely and securely in place and I'm hoping it'll stay that way for the foreseeable future. However, I've been looking at some photos on the net of people with really nice dentures and I'll concentrate on that and forget about granny's molars.
I guess I can't fight the inevitable and, as I said, I have a very good dentist. She's a bit of perfectionist who tells me she loves a challenge, so I have no doubt if/when the time comes, she'll offer me the best solution. Without her and a former, equally good dentist (who moved out of town, sadly) I'd not even have the set of teeth I have now, so I have every confidence things will work out OK. I think it's just a matter of getting used to the idea.