[Influences of cusp inclination on stability and function of removable partial dentures].
The influences of cusp inclination on the stability and the function of removable partial dentures were evaluated on 5 subjects with the maxillary unilateral free-end saddle. An experimental removable partial denture was made with six pressure sensors fixed on to the basal surface. The artificial teeth were replaceable by attachment. Several metal maxillary canine risers were made to change the inclination of the lateral gliding movement. During lateral gliding, the canine risers and the artificial teeth were contacted with the opposing mandibular teeth simultaneously. The pressures exerted upon the supporting tissues and the mandibular movements were measured during mastication with each artificial teeth of different cusp inclination. The results were as follows: 1. The steeper cusp caused the reduction of the peak pressures as well as the total pressures in most measuring spots. 2. The time differences of the first and the peak pressure detection between 6 measuring spots extended as the cusp became steeper. 3. The mandibular movements were influenced by the cusp inclination especially in the subjects with tear-drop type masticatory strokes. 4. It was suggested that the moderate cusp of artificial teeth contributed to the denture stability in function.
Haketa
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First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University.
D000328:Adult; D003779:Denture Design; D003781:Denture Retention; D003832:Denture, Partial, Removable; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged