プロビジョナルレストレーション用レジンコンポジットの特性についての研究

A study on the characteristics of resin composites for provisional restorations.

抄録

本研究では，プロビジョナルレストレーションに用いられる5種類の市販レジン複合材料の特性を評価した．レジンの無機フィラー含有量を測定し，3点曲げ試験，摩耗試験，表面硬度試験，吸水試験，染色試験を行った．試料は，貯水後にさらに3点曲げ試験を行い，5℃および55℃の熱応力を加えた（10,000サイクル）。データの分析には，一元または二元配置分散分析とボンフェローニのポストホック検定を用いた。また，一対一の比較にはPearsonの相関係数を用いた。各レジン複合材の機械的特性は，無機フィラーの含有量の違いに基づいて異なっていた。各レジンコンポジットの曲げ強さは，貯水後に有意に低下した。曲げ強さと動的硬さには正の相関が見られたが，曲げ強さと最大摩耗深さには負の相関が見られた。無機フィラーの種類と含有量，レジンマトリックス中のモノマーの組成，および可塑剤の添加は，材料の特性に影響を与える。

In this study, we evaluated the characteristics of five commercial resin composites used for provisional restorations. The inorganic filler contents of the resins were measured, and three-point bending, wear, surface hardness, water absorption, and staining tests were performed. The specimens underwent additional three-point bending tests after water storage and undergoing thermal stresses at 5°C and 55°C (10,000 cycles). Data were analyzed using one- or two-way analysis of variance and Bonferroni post-hoc tests. Pearson's correlation coefficient was used for pairwise comparisons. Each resin composite presented with different mechanical properties, based on variations in the inorganic filler content. The flexural strength of each resin composite was significantly decreased after water storage. There has a positive correlation between flexural strength and dynamic hardness but a negative correlation between flexural strength and maximum wear depth. The types and contents of the inorganic fillers, the composition of the monomer in the resin matrix, and the addition of plasticizers can affect the properties of the material.