部分床義歯の予後に関する臨床的研究(II) : 第3報義歯の破損などについて

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In order to estimate the long-term clinical effects of wearing partial dentures, the authors undertook follow-up on 2140 dentures with which 1564 patients were fitted at Tokyo Medical and Dental University. Clinical examinations were performed at the time when the dentures were inserted. Six months to five and a half years there after a questionnaire was sent out to each case to ask several simple questioats on the dentures, and to attend for re-examination. 722 cases received re-examination and 590 partial dentures of them were used at that time. We examined the fractures in these dentures. The following results were obtained : 1) The denture fractures were observed in 96 cases (16.3 percent) of the examined partial dentures. These fractures occurred in 39 cases (6.6 percent) at the denture base, in 25 cases (4.2 percent) at the artificial tooth and in 38 cases (6.4 percent) at the retainer. In 73 cases of 590 cases (12.4 percent) occurred the deformations of the retainers. On the other hand the repairs of the dentures were observed in 23 cases (3.9 percent). 2) The denture fractures, especially the fractures of the denture bases, occurred more in male than in female. 3) Comparing the upper partial dentures with the lower partial dentures, the denture bases and the retainers fractured more in the latter than in the former. 4) The fractures of the denture bases occurred more in the anterior and posterior dentures than in the anterior dentures or the posterior dentures. 5) The rate of the fractures at the denture base increased with the decrease of remaining teeth. 6) The examined dentures were divided according to their antagonistic teeth into fulldenture, partial denture and natural teeth. Their rates of the fractures were not significantly different. 7) The rate of the denture fractures did not increased with the lapse of time after their insertion. 8) The examined dentures were classified into the cases that had worn the dentures before insertion of the examined dentures and those having not worn them. The deformations of the retainers occurred more in the former than in the latter. 9) They comprised the appliances made of cast metal skeleton with acrylic resin saddles and those in acrylic resin with wrought wire clasps. The fractures of the denture bases occurred four times as many in the latter as in the former. 10) The number of the retainers were 1621 in the 590 examined dentures and most of them were clasps. The 9.9 percent of the retainers were fractured or deformed. 11) The deformation occurred more on the wrought wire clasps than on the cast clasps. 12) The retainers were classified into the three arm clasp (so called Akers clasp), thesingle clasp, the compound clasp, the ring clasp, the continuous clasp and so on. In the wrought wire clasps, the rate of the deformations was the highest on the ring clasps. In the cast clasps, the Akers clasps which were used most frequently showed the lower rate of the fractures and deformations than the others. 13) The cast clasps were divided according to their material into cobalt-chromium alloy and gold alloy. And their rates of the fractures and deformations were lower in gold alloy clasps than in cobalt-chromium alloy. But the differences were not statistically significant.
日本補綴歯科学会の論文
1968-12-31

部分床義歯の予後に関する臨床的研究(II) : 第3報義歯の破損などについて

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部分床義歯の予後に関する臨床的研究(II) : 第3報 義歯の破損などについて

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部分床義歯の予後に関する臨床的研究(II) : 第3報義歯の破損などについて