PubMed · 10321145
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N Seltzer. Partial denture design.. https://pubmed.ncbi.nlm.nih.gov/10321145/
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Careless adjusting methods to increase or decrease retention by grinding, polishing, or bending the clasp arm can lead to instability of the removable partial denture, damage to the surrounding tissues, and fracture of the clasp arm. This article describes systematic evaluation criteria and adjusting methods of retention force of a cast clasp. Excessive retention can be reduced by using a proper adjustment method, which depends on the cause. Poor retention can be increased temporarily, but it will decrease again. Evaluations and adjustment of poor retention will contribute to the diagnosis of the cause and will establish clinical and laboratory procedures that will lead to making clasps with proper retention in the future.
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170 removable partial dentures connected with continuous clasps (Kennedy bar) of 162 patients have been examined. In the case of 77 dentures the continuous clasps were tooth-supported, whereas in the other 93 cases tooth-supports has not been used. Authors examined the effect of dentures on the periodontal tissues, by measuring the frequency of occurrence of gingivitis, pocket formation, and increased tooth movability. Teeth, touching the tooth-supported clasps suffered from damage of the periodontal tissues in 20.1%. This value increased to 38.4% in the case of clasps without tooth-support.