両側性遊離端症例において維持装置のデザインの違いが支台歯の挙動に及ぼす影響 : コーヌス冠と鉤による作業側・非作業側支台の比較

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By observing the movements of abutment teeth with Akers clasp, back-action clasp, single and continuous Konus-type attachments in Kennedy class I case with loss of the first and second molars, which occures more often in the clinically, evaluated the design advantages and the drawbacks in relative sense with the judgment standard of the anatomy characteristics periodontal ligament from the movements of abutment teeth. The displacements of abutment teeth were measured using six displacement sensors for three axes when two types of test food particle (short and long food particles) were crashed, and analised the valid differences with t-test. The results obtained from the simulation model were summarized as follow. There were four types of movements -parralel movements, inclinations, twist-like movements and depressions- on the abutment teeth in this situation. 1. Parallel movements : There was almost no displacement for buccolingual, the clasp group showed the distal and Konus-type group showed the mesial large movement. 2. Inclinations a) In different from the parallel movement, the buccolingual displacements were mainly occured rather than the distal movement, inclinated to the lingual direction with slightly tilted distal. b) The difference of the magnitude of inclination was recognized almost none at the non-working side, but the inclination of the clasp group at the working side was significantly greater than that of the Konus-type, and the magnitude of inclination of the abutment tooth (5^^-) had a tendency to be greater than that of 4^^- in design K1. 3. Twist-like movements : In either the clasp design, twist-like movements were very little, but the twist-like movement barely recognized was observed at the working side of the clasp design B and the non-working side of K1. 4. Depressions a) In vertical displacements, both side abutments did not moved to up ward, but only to down ward. b) There was very small difference among each design, however, the maximum accelerated occasion, the working side support showed the larger depression in the order of K2, clasp B, A, and K1, although was slight. c) Overall, the depression rate of the non-working side support was some one-third to a half of the working side support. 5. Mechanical properties of each design : With the maximum load of the 7 kilograms, the design showed the largest inclination inside the working side support was B, followed by A, and clasp group, and those showed the larger movement than Konus-type gourps of K1 and K2. As you can see above, when the designs used in this experimentation are used in the bilateral, the danger of the distal inclination as mentioned before is very slim. Therefore, the need of the stress breaking system is very small.
九州歯科学会の論文
1997-10-25

著者

椛田健治
九州歯科大学歯科補綴学第1講座

両側性遊離端症例において維持装置のデザインの違いが支台歯の挙動に及ぼす影響 : コーヌス冠と鉤による作業側・非作業側支台の比較

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