BioHPPとナノアルミナ修飾ポリアミド樹脂の義歯床適合性、保持力および機械的特性について

Denture base adaptation, retention, and mechanical properties of BioHPP versus nano-alumina-modified polyamide resins.

抄録

義歯床用材料の継続的な開発により，ポリメチルメタクリレートに代わる革新的な材料の導入が進んでいる．本研究では，アルミナナノ粒子（AlO NP）修飾ポリアミド樹脂とBioHPP（高機能ポリマー）義歯床材の機械的性質，適合性，保存性を評価することを目的とした． 対照群（群I）（非修飾ポリアミド），2群（群II，III）（それぞれ2.5および5 wt% AlO NP修飾ポリアミド）およびBioHPP試験片群（群IV）の4群の試験片について表面硬さおよび曲げ強さを試験した．5 wt% AlO NP修飾ポリアミドレジンとBioHPPで製作した総義歯を用いて，義歯床への適合性と保持力を評価した． 高濃度のアルミナNP修飾ポリアミド樹脂（5 wt%）は，低濃度（2.5 wt%）に比べ，有意に高い曲げ強さを示し，硬さは有意に低い値であった．BioHPP群では，すべてのポリアミド群と比較して，曲げ強さ，表面硬さともに有意に向上した。組織表面積の計算値および7つの評価領域のうち4つの領域の平均ミスフィット値に関しては，両義歯床材料間に統計的に有意な差は認められなかった．また，両義歯床材とも保持力は同等であった． BioHPPおよびAlO NP修飾ポリアミドレジンは，良好な適合性，保持力および機械的性質を有する有望な代替義歯床材として使用できる可能性がある．

Continuous development of denture base materials has led to the introduction of innovative alternatives to polymethyl methacrylate. The present study aimed to evaluate the mechanical properties, adaptation, and retention of alumina nanoparticles (AlO NPs) modified polyamide resin versus BioHPP (high-performance polymer) denture base materials. Four groups of specimens, one control (group I) (unmodified polyamide) and two groups (groups II and III) (2.5 and 5 wt% AlO NP-modified polyamide, respectively) versus BioHPP specimen group (group IV), were tested for surface microhardness and flexural strength. Complete dentures fabricated from 5 wt% AlO NP-modified polyamide resin and BioHPP were used to evaluate denture base adaptation and retention. The higher concentration in the alumina NP-modified polyamide group (5 wt%) demonstrated significantly higher flexural strength values and insignificantly higher hardness values than the lower concentration (2.5 wt%). There was a significant increase in the BioHPP group in both flexural strength and surface hardness compared to all polyamide groups. A statistically insignificant difference was observed between the two denture base materials regarding mean misfit values of the calculated total tissue surface area and four of the total seven evaluated areas. Satisfactory and comparable retention values were observed for both denture base materials. BioHPP and AlO NP-modified polyamide resin could be used as a promising alternative denture base material with good adaptation, retention, and mechanical properties.