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It is much better to make an upper denture after there is a full compliment of teeth on the bottom for several reasons. But perhaps the most important is this : Without a full compliment of teeth on the bottom, an upper denture will be unstable - it will dislodge and drop as you bite together. In addition, it is not possible to accurately make a denture to fit crowns on the bottom teeth which have yet to be made. so, ideally, the crowns probably should be done first. However, if this means that you would need to wait a long period of time being unable to eat because your old top denture doesn't fit, it may be worth doing as you suggest : Fabricating a new top denture first and approximating the "occlusion" (biting shape) of the future crowns. It can be done. And perhaps, in your case, it should/ I would certainly discuss this with your dentist.
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