Prostho WREB questions

[chato1234]

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Could anyone explain this to me please!!!🙂

A maxillary model with #9 missing and some posterior teeth, To fabricate a maxillary denture, what difficulty you’ll encounter?
1)To hide the osseous defect on the anterior,
2)undercut on the posterior,
3)color matching with natural teeth?? WHY???😕

Posterior teeth contact when say “fifty and sixty”
1)Increase/Decrease VDO and move max teeth? WHY??😕
2)Increase/Decrease VDO and move mand teeth?

Thanks