低侵襲性修復におけるプロビジョナル用材料の厚みの影響．

The Influence of the Thickness of the Materials for the Provisionalization in Minimally Invasive Restorations.

抄録

このin vitro研究は，厚みの異なる2種類の仮歯用バイアクリル樹脂，すなわちストラクチュア3とストラクチュアプレミアムの曲げ強さと弾性率を測定し，両者を比較することを目的としたものである．試料は，厚さの異なる（1 mm，1.5 mm，2 mm）各材料30個ずつ，計60個を用意した．寸法はUNE-EN ISO 178:2019規格に準じ、長さ24mm、幅10mm、厚さは記載のものを使用した。材料は、3点曲げ試験を行った。弾性率については、Structur 3材料の1.5 mmと2 mmの厚さの間で、統計的に有意な差が観察されました。ストラクチュア・プレミアムについては，厚さ 1mm と 1.5mm の間，および厚さ 1mm と 2mm の間で統計的に有意な差が観察された．曲げ強さについては，いずれの材料も厚みの違いによる統計的な有意差は認められなかった．曲げ強さと弾性率の両方において、両材料間に有意な差が認められ、ストラクチュア・プレミアムの方が高くなっています。曲げ強さと弾性率は，ストラクチュールプレミアムの方がストラクチュール3よりも高く，弾性率には有意差が認められたが，曲げ強さには厚みによる有意差は認められなかった．

This in vitro study aimed to determine the flexural strength and modulus of elasticity of two bisacrylic resins for temporary crowns at different thicknesses, i.e., Structur 3 and Structur Premium, and to compare them with each other. Sixty samples were prepared, thirty of each material, which were made at different thicknesses (1 mm, 1.5 mm, and 2 mm). The dimensions followed the UNE-EN ISO 178:2019 standard, with a length of 24 mm, a width of 10 mm, and the thicknesses described. Materials were subjected to a three-point bending test. For the modulus of elasticity, statistically significant differences were observed between the 1.5 mm and 2 mm thicknesses of Structur 3 material. For Structur Premium, statistically significant differences were observed between the thicknesses 1 mm and 1.5 mm as well as between 1 mm and 2 mm thickness. With respect to flexural strength, no statistically significant differences were observed for either material at the different thicknesses. Significant differences were observed between the materials for both flexural strength and modulus of elasticity, being higher for Structur Premium: Structur Premium has a higher flexural strength and modulus of elasticity than Structur 3. There are significant differences for the modulus of elasticity but not for the flexural strength between thicknesses.