正常な骨支持を想定した片持ちバリ固定性義歯支台の変位分析
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概要
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Kennedy class II simulation model with lower left first and second molar missing was constructed to analyse the mechanical behavior of a cantilevered fixed partial denture. Test food was put on the lower dental arch including each abutment tooth on the working side, and the displacement of abutment teeth 5^^-, 4^^- and 3^^- under loads was measured by using digital type of laser displacement sensors from the sagittal, frontal and lower direction and the measurements were reciprocally compared through the statistical analyses. The results obtained were as follows : 1) Four displacement forms : parallel movements, inclinations, twist-like movements and depressions were recognized in individual abutment tooth of the single (design M), the two splinted (D), and the three splinted abutment casting (T). 2) The abusolute magunitude of the displacement was largest in parallel movements, and smallest in twist-like ones. 3) The displacement magnitude increased by increasing loads in any designs. 4) Parallel movements and inclinations displaced to distolingual direction, and twist-like movements rotated clockwise about a vertical axis in every design and every abutment tooth. 5) Force exerted on the lower dental arch including posterior cantilevered pontics caused greater displacing pressure on the most anterior abutment tooth than the adjacent abutment one to the edentulous region. 6) No equal displacement was recognized even on the individual tooth of the same casting of the splinted abutment. 7) On comparing displacements of the abutment tooth with the cantilever fixed denture and without one, the former showed greater inclinations especially than that of the latter. 8) By increasing the number of abutment tooth, the abutment tooth 5^^- was affected significantly by the decrease of inclinations, and the abutment tooth 4^^- by that of depressions. 9) The displacement of the most posterior abutment tooth 5^^- was greatest in the design M, especially on inclinations and twist-like movements, and the displacement in the design D was inclined to be smaller than that of the design M except depressions. 10) The displacements of the design T-1 P, especially on inclinations and twist-like movements, were smallest, and similar to the displacement of the control respectively in every design used in this experiment. To reiterate the results written above, large damaging movements were observed in the abutment tooth compared to the control even if any designs of cantilever fixed dentures were used. However, this experiment suggested that the effect on the abutment tooth can be reduced to a minimum when the design T-1P is used.
- 九州歯科学会の論文
- 1998-06-25