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PubMed1978

Stresses from loading distal-extension removable partial dentures.

A concentrated load of 222 N in the region of the central fossa of the second molar resulted in stresses in the supporting bone which increased gradually from zero in the region of the retromolar pad to about 25 MN/m2 distal to the second molar. Stresses in the alveolar bone supporting the second premolar were about 30 MN/m2 at the cemento-enamel junction, decreased to about 20 MN/m2 distal to the apex of the root, increased to 100 MN/m2 at the apex, and decreased to 3 MN/m2 near the mesial upper third of the root surface. When a distributed load of 222 N was applied to the first and second molar region, the stress distribution was similar to that observed for the concentrated load, and stress magnitudes were about 20% lower. Dramatic decreases in stress, with the maximum stress at the apex being 40 MN/m2, occurred when a 222 N load was distributed in the area of the marginal ridge.

Bicuspid↗
PubMed1997

Pattern waxes and inaccuracies in fixed and removable partial denture castings.

It is the desire of every dentist and dental technician to produce a restoration that will fit the patient with a minimum of adjustments and certainly one that does not require remaking. Yet many abuse the materials with which they work, either through improper manipulation, lack of familiarity with their properties, or by attempting to reduce laboratory time by taking short cuts. Wax is one of the materials that requires more knowledge and skill to manipulate accurately because it has a considerably higher coefficient of thermal expansion (and contraction) than any other dental material. It often contributes considerably to the inaccuracies of cast dental restorations. This article provides a review of dental waxes used to make prosthodontic castings and points out some of the properties of waxes that must be controlled to make accurate restorations.

Dental Casting Investment↗