RPD Manual 11 - Removable Prosthodontics - Dalhousie University

Minor Connectors - 42
When the denture is flasked for processing, only the gridwork is left exposed after the wax
removal. If there is no “tissue stop”, the framework can be bent or displaced during the pressure
packing of the mold with stiff doughy acrylic resin. If this occurs, the framework could resume
its normal shape after deflasking, and the denture would subsequently lift off the tissue. Rocking
of the denture base and clasp apparatus would result, and the occlusion would be high. A tissue
stop, in theory, prevents framework deformation and its consequences.
The denture teeth are embedded in investment in one
half of the processing flask, the framework is
embedded in the other, with acrylic resin in between
(note the absence of a tissue stop).
Placement of the finished denture in the mouth (note lack
of tissue contact due to rebound of the distorted
framework).
Closure of the flask under hydraulic pressure can
causes distortion of the framework, pushing it
tissueward.