粘膜負担部の印象法と義歯床圧支持性の関係

Relationship between impression method of mucosa-borne area and denture pressure supportability.

抄録

より合理的な印象法を開発するために，印象法と義歯を通した圧力支持力との関係を検討した．様々な圧力で採取した印象から作製した義歯床を用いて測定したところ，一般に印象圧が高くなるにつれて圧力支持性が高くなった．しかし，最小圧力で採得した軽圧印象の義歯床の圧力支持性は，より高い圧力で採得した中圧印象よりも大きい場合があった．最大圧力支持を得るために必要な印象圧は，咬合面からの投影面積で計算すると1.24〜2.44 kg/cm2（0.12〜0.24 MPa）であった．義歯支持粘膜の表面積から計算した値は0.83～2.48kg/cm2（0.08～0.24MPa）であり，義歯支持粘膜の表面積から計算した値は1.24～2.44kg/cm2（0.12～0.24MPa）であった．大圧印象の圧力支持力は小圧印象の1.3〜2.6倍，アルジネート印象の1.2〜1.8倍であった．臨床的見地から，大圧印象はアルジネート印象および無圧（微圧）印象よりも義歯の圧力支持性を向上させる効果がある．

In order to develop a more rational impression method, we examined the relationship between impression method and denture pressure supportability through the denture. Measured with denture bases prepared from impressions taken under various pressures, pressure supportability generally increased with increasing impression pressure. However, the pressure supportability of a denture base prepared from a slight-pressure impression taken under minimum pressure was greater in some cases than for a middle-pressure impression performed under a more pressure. The impression pressure required to produce maximum pressure supportability were calculated based on the area projected from the occlusal plane and ranged from 1.24 to 2.44 kg/cm2 (0.12 to 0.24 MPa). Values calculated based on the surface area of the denture-supporting mucosa ranged from 0.83 to 2.48 kg/cm2 (0.08 to 0.24 MPa). Pressure supportability of the great-pressure impression was 1.3 to 2.6 times higher than that of the slight-pressure impression and 1.2 to 1.8 times greater than that of the alginate impression. Viewed from a clinical standpoint, the great-pressure impression is more effective than the alginate and no-pressure (slight-pressure) impressions in increasing denture pressure supportability.