コーヌスクローネ支台の挙動からみた最後臼歯排列の影響
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概要
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About twenty years have passed since the rigid connection between abutment teeth and retainer was advocated for supporting removable partial denture. Konuskrone-retained dentures have stood high in the clinical evaluation. However, the reason why Konuskrone is superior to other retainers have not been made clear yet. The present study was scheduled to experimentally investigate the characteristic behaviors of the abutment teeth for Konuskrone retainers when they were altered in number and location in the mandibular unilateral distal extension removable partial denture. Six types of unilateral distal extension partial dentures were constructed ; three of them were of unilateral designs having one, two and three abutment teeth on the same side of the denture base, respectively, and the other three of bilateral designs having additional one abutment tooth on the opposite side in each of the above unilateral designs. Each partial denture was given one, three and five kilograms load on the part of socond molar. The tooth movement was measured in horizontal, frontal and sagittal planes by means of mandibular kinesiography (MKG) and laser displacement sensors on a Kennedy class II simulation model. The results obtained were as follows : 1. On loading from vertical side, there was no difference in abutment tooth movement between the first molar and the second except in the vertical direction. Displacement of vertical direction when the load was applied on the second molar was smaller than that of the first molar. 2. The unilateral design with two abutment teeth caused large displacement in mesio-distal and bucco-lingual directions. 3. In spite of connecting with mesial abutment teeth, primary abutment tooth showed larger displacement in the mesio-distal direction rather than bucco-lingual direction in the unilateral design with three abutment. 4. There was a tendency to be more stable in the case of the bilateral designs than the unilateral. However, addition of mesial abutment did not always decrease abutment teeth movement. 5. The loading from buccal side caused much larger vertical displacement and horizontal gyration. 6. The loading from lingual side of the second molar in the unilateral design showed larger displacement of abutment teeth than that of the first molar. 7. Abutment teeth of not only unilateral but also bilateral designs showed the largest displacement on loading from bucco-lingual side.
- 九州歯科学会の論文
- 1994-10-25