I was recently diving with a temporary crown for over a week. No problems there either.
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Temporaries would be contraindicated for diving.
I am old (62) with lots of crowns. I had a problem on a trip to Fiji a few years with a tooth squeeze on descent. It turned out to be decay under an old crown that created a squeezable air pocket. New crown and a grand $ later, no more problem
shouldn't..... i've got several crowns & bridges myself.
Temporaries are just that, temporary. Dislodging at dinner, movie ,etc, easily spit out. Underwater, with regulator they are a potential choking hazard. Strange things can and will happen. Get the permanent and one less worry. Same should apply to smaller removable appliances, in fact, I wouldn't dive with a denture either.