ワイヤーエーカース鉤の舌面形態の違いが犬歯支台の挙動に及ぼす影響
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概要
- 論文の詳細を見る
On a case of distal extension removable partial prostheses with only six frontal teeth remaining, the wrought wire Akers clasp system has been usually used in expectation of the stress breaking action of flexible compornents because of an unfavorable prognosis. No plactical availability of this system, however, has been confirmed in vivo and in vitro too. The measurement device in six degree of freedom was utilized for revealing the effect of five types' lingual compornents of wrought wire Akers clasp system on the canine abutment movement, especially tipping movement. From this in vitro study the following conclusions could be drawn : 1) On comparing the tipping movement of each design with the design 1 as the control, no significant difference was found between any two designs regarding inclination of the abutment tooth. 2) The tipping direction of designs 2 and 4 with an ordinary lingual rest was mostly towards labial direction, but the inclination of designs 3 and 5 without an ordinary lingual rest, and design 1 considered as a specific type without an ordinary lingual rest and a reciprocal compornent such as a hook also was all towards lingual direction. 3) No significant difference was also recognized between the magnitude of inclination of the abutment tooth in crushing short type test food and that of the abutment tooth in crushing long type test food, although the latter inclination tended to be greater than the former one. 4) In comparing the magnitude of inclination of the working side abutment with that of the balancing side abutment tooth the former had a tendency to be greater excepting that of design 1, but there was no significant difference between the magnitude of inclination of either side. 5) Significant difference of ninety nine per cent confidence levels was recognized between tipping magnitude in unilateral loading and one in bilateral loading, and the latter was larger than the former. On the basis of the foregoing findings, the lingual compornent shapes of the wrought wire clasp systems has influence upon the canine abutment movement but the influence was found to be very small, especially on the magnitude of inclination. However, on tipping direction of the abutment tooth, the indicatioin was that it was influenced considerably in the same manner as that of cast Akers clasp systems.
- 九州歯科学会の論文
- 2002-04-25