FIRST PRINCIPLES OF FOUNDATIONAL CAPACITY IN DENTAL INVESTING TISSUES

¹ Detroit, Mich.

To study the characteristic movements of teeth to torque and the effects of prosthetic structures on such movements, stove bolts were imbedded in masses of Korogel to simulate teeth in investing tissues. Single teeth as well as multiple teeth supporting bridgework may be studied for rotational effects to horizontal forces or eccentric loading. Variables relating to size and lengths of the root portion imbedded in the investing material can be kept at laboratory constancy and with simple measuring devices a close quantitative analysis may be reached to direction and degree of rotation of teeth to horizontal forces. Fixation of abutments alters the characteristic simple hinge rotation of the individual teeth to produce larger arcs of rotation. Rotation of a structure with fixed abutments occurs upon a center lying in the bone between the abutments. The abutments move bodily up or down depending upon which side of center they happen to be. Mechanical advantage is gained by the larger orbit of rotation. Foundational stability varies directly as the radius and is further dependent upon the angle of application of the horizontal force.