局部床義歯の設計と同義歯の咀嚼力との関係について
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概要
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Prosthetic effects of partial pate denture must be considered from various factors. And, calling a mastication in question, a physically important factor is the composite values of masticatory power of each of tlae abutments and the artificial teeth in the partial dentures. For the similar edentulous cases, the author constructed various types of partial plate dentures under different designs, and with these measured the biting force on each of the abutments, the artificial teeth and the control teeth respectively. In terms of these measurement data, the author comparatively evaluated masticating forces of the partial denture with different designs. And the following conclusions were obtained. 1. Measurement values of each of the abutments with direct retainers corrcsponded to about 70-78 per cent to that of controls before insertion of partial denture. After the insertion, this value increased by about 6-11 per cent. The value of the abutments with indirect retainers, on other hand, are similar to that of controls before insertion and increased by about 5-10 per cent after insertion. 2. As regards the measurement values of each artificial tooth in the unilateral tooth-borne partial dentures, they were as follows compared with those of controls. i) Artificial teeth of the partial dentures, designed with direct retainers on one side of the arch. [table] ii) Artificial teeth of partial dentures, designed of the arch. [table] As seen from the above table, it could be found some difference in the values among artificial teeth. It was, however, clear that the unilateral tooth-borne partial dentures in general had masticating effect of compensating for about 42-74 per cent masticatory power as compared with that of controls. The masticating effect was greater in upper dentures than in lower dentures and greater in the dentures with indirect retainers than in the dentures with direct retainers. 3. The measurement values of unilateral free-end partial dentures were as follows. i) Unilateral desigend with direct retainers on one side of the arch. [table] ii) Unilateral dentures, designed with indirect retainers on the other side of the arch. A. Unilateral dentures, designed with indirect retainers on the other side of the arch. A. The dentures, designed with extended palatal or lingual bars on the other side of the arch. [table] B. The dentures, designed with extended palatal or lingual plate on the other side of the arch. [table] Although there were some difference in the values among artifical teeth, these unilateral free-end dentures in general compensated for 27-67 per cent masticatory forces as compared with controls. In masticating effects, they increased in the order of the denture, designed with direct retainer of one arch side, the bar-denture, designed with indirect retainer and the plate denture with indirect retainers on the other side of the arch. 4. As regards measurement values of each artificial tooth in the bilateral tooth-borne partial dentures, the dentures designed with palatal or lingual gave larger value than those designed with palatal or lingual bar. 5. As regards measurement values of each artifical tooth in the bilateral free-end dentures, the dentures designed with palatal or lingual plate gave larger values than those with palatal or lingual bars. From the findings in 4) and 5) above, it was clear, that both in the bilateral tooth-brone dentures and the bilateral free-end dentures, the denture with palatal or lingual plates gave better masticating forces than those with palatal or lingval bars. 6. In both the bilateral too-borne partial dentures with bars and those with plates, no significant difference was found in the measurement values of each artificial tooth between upper and lower jaws, and also between right and left side of jaws. On the other hand, in both the bilateral free-end dentures with bars and those with plates, the measurement values of each artifical tooth were greater in the upper dentures than in the lower dentures, namely, the significant differene was recognized between upper and lower, jaws, but no difference was found between right and left side of jaws.
- 社団法人日本補綴歯科学会の論文
- 1968-07-31