アブストラクト(30巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : ガイドプレーンの形態とクラスプの維持力に関する研究
Subtitle : 原著
Authors : 宮川英光, 松尾悦郎, 日笠不二夫, 杉村大介, 新谷忠, 佐々木俊彦
Authors(kana) :
Organization : 神奈川歯科大学歯科補綴学教室第I講座
Journal : 神奈川歯学
Volume : 30
Number : 1
Page : 93-96
Year/Month : 1995 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 一般にクラスプは, 義歯装置状態において歯面に対して緊密に接しながらも支台歯に有害な力を及ぼさないように設計される. しかし, 義歯の着脱時や機能時には, その剛性によって本来の役目である義歯の維持力, 指示力, 均衡力を発揮する他に支台歯に対して有害な力を与える事も考えられる. これらの問題について種々な報告があるが, なかでも鋳造鉤の維持力に関して西山は, Gingivally approaching claspのIバータイプの維持力の影響因子について検討し, 鉤腕の太さ, 長さ, アンダーカット量, 鉤腕の接近角度, 鉤歯の曲率半径などの因子が影響するとしている. また, 杉山, 松田らは, Occlusally approaching claspのエーカースタイプについて鉤用金属, アンダーカット量などを変えて維持力を測定した結果, アンダーカット量は白金加金で0.5mm, コバルトクロム合金で0.25mmならばクラスプの永久変形が生じないと報告している.
Practice : 歯科学
Keywords : エーカースクラスプ, ガイドプレーン, 維持力

English

Title : A Study of Guide Plane Form and Clasp Retentive Force in Dentures
Subtitle : Original article
Authors : Hidemitsu MIYAGAWA, Etsuro MATSUO, Fujio HIGASA, Daisuke SUGIMURA, Tadashi NIIYA, Toshihiko SASAKI
Authors(kana) :
Organization : The 1st Department of Prosthetic Dentistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 30
Number : 1
Page : 93-96
Year/Month : 1995 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract ; Denture Clasps cling firmly onto abutment teeth but are generally designed not to cause them damege. Nevertheless the rigid clasps may exert, in addition to the retentive, supporting and balancing forces that they are supposed to, damaging force on the teeth, during the wear, removal and use of dentures. Studies have shown that the construction of guide planes on abutment teeth can help prevent them from loosening sideways. But some of the retentive force may be lost when they are used because the undercut of either the buccal or lingual arm is usually leave idle. Using Akers' clasps, which often require the construction of guide planes, and subjecting abutment teeth to seven conditions, we studied the from of guide planes and retentive force of clasps. We found that a maximum retentive force of 517.3g was exerted when guide planes were not used and minimum of 477.6g exerted when guide planes were constructed onto lingual arms and the buccal arms alone served as retaining arms. Even when absent in one or both arms, the retentive force was lost by only 5.2 to 7.7 in both. We also found that as long as the axis of insertion and the axis of the biting or masticatory forces were not aligned the guide plates can and require only a little retentive force to keep the dentures from coming loose. We conclued that the guide plane's from has little effect on the retentive force and that the guide plane is, as earlier studies have indicated, extremely useful as a retention arm.
Practice : Dentistry
Keywords :