口蓋板の牽引方向と圧力負荷が保持力に及ぼす影響

Effect of traction direction and pressure load on the palatal plate on retentive force.

抄録

背景:

近年、ドライマウス患者を対象に、洗浄性に優れ、保湿成分を配合した義歯床用接着剤が開発されている。従来の義歯床用接着剤と口腔保湿剤による保定力の比較は模型上で行われているが、口腔内での比較は報告されていない。本研究では、無歯顎模型で作製した口蓋板を用い、牽引方向や圧接時の荷重の違いが保持力に及ぼす影響を明らかにすることを目的とした。

BACKGROUND: Recently, a denture adhesive that is easy to clean and contain moisturizing ingredients have been developed for patients with dry mouth. Although the retentive force produced by conventional denture adhesives and oral moisturizers have been compared on models, no study has reported their comparison in the oral cavity. In this study, we aimed to clarify the effects of different directions of traction and loads at the time of pressure contact on the retentive force on a palatal plate made from a dentulous jaw model.

方法:

無歯顎模型上に熱可塑性樹脂で口蓋板を作製し、口蓋中央にループ状の牽引装置を取り付けた。試験片は，クリーム状義歯床用接着剤，ドライマウス用義歯床用接着剤，口腔保湿剤，義歯保湿剤とした．試験片をプレート内面に塗布し、垂直加圧下で装着した。その後、デジタルフォースゲージを用いて、プレートを様々な方向、様々な荷重で引っ張り、保持力を測定した。

METHODS: A palatal plate was fabricated with thermoplastic resin on a dentulous jaw model, and a loop-shaped traction device was attached to the centre of the palate. The test samples were a cream-type denture adhesive, a denture adhesive for dry mouth, an oral moisturizer, and a denture moisturizer. The specimens were applied to the inner surface of the plate, which was then mounted under vertical pressure. Then, the retentive force was measured, using a digital force gauge, while the plate was pulled in different directions and with different loads.

結果:

牽引方向が45°から60°の間では、どの試験サンプルにおいても保持力に有意差は認められなかった。ドライマウス用義歯床用接着剤の保持力は、牽引方向が90°の場合、45°および60°の場合よりも有意に高かった。口腔保湿剤使用時の保持力は，牽引方向が90°の方が45°よりも有意に高かった．ドライマウス用義歯床用接着剤を使用した場合の保持力は4.0kgfと5.5kgfで有意差は認められなかった．4つの荷重の大きさを比較すると、荷重が大きいほど保持力は大きかった。クリームタイプの義歯床用接着剤および義歯床用保湿剤についても同様の結果が得られた。口腔保湿剤を使用した場合，荷重が大きいほど有意に高い保持力が観察された．

RESULTS: No significant difference in retentive force was observed in any of the test samples when the direction of traction was between 45° and 60°. The retentive force of the denture adhesive for dry mouth was significantly higher with a direction of traction of 90° than that of 45° or 60°. The retentive force when oral moisturizer was used was significantly higher in the 90° traction direction than in the 45° direction. There was no significant difference between a force of 4.0 kgf or 5.5 kgf when using a denture adhesive for dry mouth. Comparing the four load size conditions, the larger the load, the higher was the retentive force. Similar results were obtained for the cream-type denture adhesive and denture moisturizer. Significantly higher retentive force was observed for larger loads when oral moisturizer was used.

結論:

この結果から，牽引方向と圧力荷重が口蓋底板の保持力に影響を及ぼすことが示唆された．

CONCLUSIONS: The results suggest that the direction of traction and the pressure load affect the retentive force on a palatal plate.