PubMed · 801181
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M Matsumoto. 1976. [Overdenture technic. 1].. https://pubmed.ncbi.nlm.nih.gov/801181/
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An extensive overview of dental implant abutments for coronally hexed implants is presented. Abutment technology, indications, and contraindications for abutments are discussed. Various implant designs from 16 commercial manufacturers with over 64 abutment variations and transfer concepts are illustrated.
This article addresses the complex nature of retention in a removable partial denture. Retentive features range from magnets and springs to clips, clasps, and interfacial surface tension. The retentive quality of an extracoronal clasp varies with the alloy, physical form, location on the abutment, and positional relationship to other elements. Surveying to identify both occlusogingival and mesiodistal undercuts when the path of random dislodging forces are not definitely controlled is needed for effective retention. Augmentation of ineffective retention in existing clasps should concentrate on methods of deepening the undercut or increasing the suprabulge. Tightening of clasps already in contact with a tooth frequently produces adverse changes.
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