RPD Review Questions
The all-metal base would be very strong even with very limited thickness. In order for plastic to extend beneath either latticework or meshwork, the metal retentive network must be off the ridge by a millimeter or so. This would leave little space for plastic external to the network. There simply is not enough interocclusal space for adequate thickness of BOTH plastic and metal. The all plastic base would be very weak because of the limited thickness and is therefore not indicated.