クラスプによるこう歯エナメル質の磨耗

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  • Abrasion of Tooth Enamel by Removable Partial Denture Clasps.

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The purpose of this study was to investigate the abrasion of tooth enamel by removable partial denture clasps. In vivo, replica of abutment tooth of removable partial denture was observed by SEM. In vivo, abrasion test of extracted tooth by experimental clasp made by 12% Au-Pd-Ag alloy was carried out. The relationship between disloading force and abrasion time was also investigated.<BR>Upon SEM viewing abrasion of tooth enamel was observed in case of casting clasp, but not in case of wire clasp.<BR>In abrasion test, enamel scratches parallel to tooth axis were found at more than 5, 000 abrasion times. Disloading force of clasp decreased rapidly within 4, 000 abrasion times and then decreased gradually until 10, 000 abrasion times.<BR>It was clear that enamel of abutment tooth was abrased by removable partial denture clasp, and suggested that the initial rapid decrease of retaining force was attributed to transformation or abrasion of clasps and later gradual decrease of retaining force was attributed to abrasion of tooth enamel.

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