Polyoxymethylene (POM) in the Production of Telescopic Denture in Older Adults With Subtotal Edentulism

Remaining teeth will be prepared by conventional grinding technique, followed by impression, casting and scanning with extra oral scanner. Inner telescopic crowns will be made of cobalt-chromium alloy by milling technique and outer crowns together with denture framework will be made of polyoxymethylene by the method of single phase injection moulding. Denture delivery is done by inserting both inner and outer crown at the same time, during which the inner crown is cemented to the abutment tooth and the contact surfaces of the outer and inner crown are isolated so that the outer crown and denture framework can be removed.

A conventional complex partial denture is a removable partial denture with clasps combined with metal-ceramic surveyed crowns with milled surfaces for removable dentures. The metal-ceramic surveyed crowns are shaped in such a way that they build a morphological and functional whole with complementary elements of the removable partial denture's framework. In the control group, as well as in the experimental group, the remaining teeth are prepared using a conventional grinding technique, then an impression is taken for dedicated metal-ceramic crowns, casting, and milling of crowns, ceramic sintering, impression through the metal-ceramic surveyed crowns and fabrication of a removable partial denture's framework with clasps using the casting method. Dedicated fixed restorations will be made of Co-Cr alloy inside the crown and ceramic layer on the surface, and the framework and clasps of the removable partial denture will be made of Co-Cr-Mo alloy.