Hi @stephen-johnston, thanks for your question!

Firstly as dentures are a replacement for natural teeth,  they will never be as strong and sturdy as your original set of dentitions. The aim of denture is always to replicate as closely as possible to your natural teeth.

The success of dentures is generally dependent on the number of healthy teeth available to support it, the amount of bone remaining on your arch, and the patient's ability to tolerate dentures. 

If an accurate assessment of your oral condition is made, and an accurate mold is done for the lab to fabricate your denture, it generally allows the denture to fit rather well for the patient.

Hence, it is much less dependent on the price of the dentures, but on the expertise and experience of the dentist designing your denture for you that will ultimately determine the fit of your denture!

Hope this clarifies your question!

Hi @stephen-johnston, just to add on to what Dr. Bertrand Russell Lee has helpfully explained, there indeed are different types of dentures that vary in price. In increasing order in terms of cost, these are mainly:
1. Acrylic (plastic) dentures
2. Chrome (metal) dentures
3. Flexible dentures 

Each material has its pros and cons and there are many other important factors which have to be considered when your dentist decides on the material to be used e.g. the condition of your other teeth, the number of teeth to be replaced, the position of the teeth to be replaced.

Hope this helps!