PubMed · 4550180
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D D Krajicek. 1972. Why partial dentures fail?. https://pubmed.ncbi.nlm.nih.gov/4550180/
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Overdentures designed to prevent direct occlusal trauma to the residual ridge may either forestall or reduce residual ridge resorption. Overdentures may also be used to improve abnormal maxillomandibular relations, thereby enhancing both function and esthetics.
A precise fit at the prosthesis attachment interface is necessary to assure atraumatic loading of the implant fixture. The required high degree of frame accuracy can be more difficult to achieve when a single fixed prosthesis uses different root form implant systems for support. Two clinical protocols are described for these fixed implant prostheses. The first protocol uses a semiprecision attachment for the restorations. The second protocol uses a modified abutment system and a one-piece frame design.
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