デンチャースペースの形態的な特徴に関する臨床的研究
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概要
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In order to construct a stable lower complete denture, the principle and the technique of the so-called flange technique, or the neutral zone technique has been utilized in our department of prosthetic dentistry for about thirty years, and the satisfactory results have been obtained in clinic. However, little theoretical explanation about the morphological chractristics of the denture space has been presented. The purpose of this research was to examine the relationship between the denture space and the alveolar ridge, and between the tongue space and the mucous membrane of cheek which surround the denture space, and also the physiological acceptance of the denture space. For this examination sixteen patients with functioning and healthy oral supporting tissue except for edentulous jaws were chosen so that the characteristics of form of the denture space were clarified by flange technique. After impressions were obtained in the usual manner, stone casts were poured. On the lower cast, a base plate has been fabricated with self-curing acrylic resins for each patient, and two to seven plates were duplicated from the base plate by usual flasking method, in order to record repeatedly under the same condition. The complete denture constructed according to the denture space obtained in such a way has shown an excellent stability, especially during non-articulation such as speaking. Therefore each denture space recorded in such a way can be considered to be one of phisiologically and functionally acceptable amounts, although the individual shape of the denture spaces might have subtle differences. The results considered from such a view-point could be summarized as follows : 1. About 12% in acceptable area of the denture space was found through the statistical analyses. 2. The acceptable amount was smaller in molars than that in anterior regions with tendency to increase. 3. In the relation between the mid-point of the denture space and the alveolar ridge line, the former in the molar had 1mm of acceptable amount to the buccal direction and in the anterior region 2mm to the labial direction. 4. The acceptable amount of the denture space was about 2.5 to 3% in length. 5. In the buccolingual width of the denture space it was recognized a positive correlation as well by regression analysis (p<0.05). 6. Positive correlation was detected between the width and the length in the mesial half of the lingual margin area (ST/2) and the buccal margin area (SB/2) of the denture space, but no correlation between them in the whole area to the lingual margin (ST) and the whole area to the buccal margin (SB) of the denture space. 7. Although no correlation coefficient between the area surrounded by SA and SD was found, a positive correlation was detected by regression analysis between SA and ST, and also between SA and SB (p<0.001) respectively. 8. Positive correlations were recognized significantly between the right and the left halves of SD and the right and the left halves of SB, but the correlation of SD was smaller compared with that of SB 9. SA, ST, SB and SD showed a ratio of 2.5 : 2.3 : 3.8 : 1.4. 10. About 1.7mm and 2.0mm of acceptable amounts were recognized respectively in the distance from the alveolar ridge line to the buccal margin and to the lingual margin of the denture space in the reference points, P_3, P_4, P_5, where the occlusion could be considered as most important. To construct complete denture prostheses, especially in their difficult cases, it seemed to be essential to obtain the denture space recording and to arrange the denture teeth and to form the polished surface within the space, though it was detected that the denture space had a fairly acceptable area.
- 九州歯科学会の論文
- 1996-08-25