総義歯装着者における粘膜の応力負担能力について

The stress-bearing ability of mucosa in complete denture-wearers.

抄録

研究目的:

本研究の目的は、総義歯装着者の粘膜の応力負担能力を調査することである。

OBJECTIVE: The purpose of this study was to investigate the stress-bearing ability of mucosa in complete denture-wearers.

方法:

31名の義歯装着者を対象に，小型咬合力測定器と中心支持装置を用いて最大咬合力（MBF）を測定した．また，下顎総義歯の印象面から下顎投影型応力負荷面積（PAM）を測定した．また，総義歯装着者の粘膜の応力負担能力（SBA）をMBF/PAMという式で評価した．

METHODS: The maximum bite force (MBF) was obtained in 31 voluntary complete denture-wearers with a miniature bite force instrument and a set of central bearing devices. The projective stress-bearing area in the mandible (PAM) was measured through the impression surface of the mandibular complete denture. The authors evaluated the stress-bearing ability (SBA) of mucosa in complete denture-wearers by the formula MBF/PAM.

結果:

MBF（平均値：男性15.13kg，女性11.39kg）とPAM（平均値：男性17.15cm2，女性14.46cm2）は有意な正の相関を示し，SBAの平均値は男性（0.89kg/cm2）と女性（0.79kg/cm2）で有意差はなかった．また，下顎無歯顎領域が負担する最大圧力の平均値は82kPa（0.84kg/cm2）であった．

RESULTS: The results showed that there was a significant positive correlation between the MBF (the mean was 15.13 kg in men and 11.39 kg in women) and the PAM (the mean was 17.15 cm2 in men and 14.46 cm2 in women) and that there was no significant difference between the mean of the SBA in men (0.89 kg/cm2) and the mean of the SBA in women (0.79 kg/cm2). The mean value of the maximum pressure borne by the mandibular edentulous region was 82 kPa (0.84 kg/cm2).

結論:

SBAは，義歯製作における咬合と補強の設計および総義歯の機械的試験における最大荷重の選択に有用なパラメータとなり得る．

CONCLUSIONS: The SBA may become a valuable parameter for the design of both occlusion and reinforcement in the denture construction and for the selection of the maximum load in mechanical tests of complete dentures.