全部床義歯に関する研究 (重さと大きさについて)

Abstract

No one of us will not recognize the fact that the retention coefficient of the complete denture has much to do with the weight of denture itself. However, the vulcanite denture base material has quitely given place to the acrylic resin in these ten years, so it will easily be imagined that the mean value of the weight of acrylic complete denture might as much differ from that of the vulcanite complete denture as at least the difference of specific gravities between these two base materials. On the mean weight of the vulcanite complete denture was it reported in 1942 by Nakazawa and others, but none on the acrylic. This reminded us of weighning the finished acrylic complete denture and measuring the sagittal (length) and transverse (breadth) diametre of the artificial dental arch. The“breadth”what we mean, of the artificial dental arch is the distance of a contact point of M1 and M2 on one side from a point on the other side and the“length”is a line drawn from a contact point of both middle incisors to the“breadth”.The results obtained were as follows:1b) Mean-Age of patients: Male 61.9 y. and female 52.8 y..2) Weight and size of dentures were on the average higher in male than in female, and in upper than in lower. (Tab. 1)1a) 353 acrylic complete dentures (upper 188, lower 165) of 125 patients (male 52, female 73) were examined and studied statisticaly.3) Mean weight of the acrylic complets denture was less than that of the vulcanite just so much as correspondent to the difference between the specific gravities of resin and vulcanite. (Tab.1 & 2)4) There was a signiflicant correlation between“weight”and“breadth”but no signifficant correlation between“weight”and“length”. This is probably according to that the“breadth”of artificial dental arch is indicating the comparative size of the alveolar arch, but the“length” does not.