新規自己接着性レジン系セメントの機械的性質

Mechanical properties of new self-adhesive resin-based cement.

• Takashi Nakamura
• Kazumichi Wakabayashi
• Soichiro Kinuta
• Hisataka Nishida
• Morihiro Miyamae
• Hirofumi Yatani

抄録

目的:

本研究の目的は，新規自己接着性レジン系セメントの接着強さ，曲げ強さ，弾性率，吸水率，貯水後の膨張率を市販の歯科用セメントと比較することである。

PURPOSE: The aim of this study was to compare the bonding strength, flexural strength, elastic modulus, water absorption and the expansion after water storage of new self-adhesive resin cements to commercially available dental cements.

方法:

新規自己接着性レジンセメント2種（ハンドミックス、オートミックス）、従来型レジンセメント1種（パナビアF2.0）、自己接着性レジンセメント3種（リレックスユニセム、マックスセム、Gセム）、レジン変性ガラスイオノマーセメント2種（フジリュウティングS、ビトレルマー）を使用し、それぞれのセメントのせん断接着強さ、曲げ強さ、弾性率（ISO 4049）、吸水率（ISO 4049）を調べた。せん断接着強さ，曲げ強さと弾性率（ISO 4049），吸水率（ISO 4049），貯水後の膨張率を調べた。

METHODS: Two types (hand-mix and auto-mix) of new self-adhesive resin cements (SAC-H and SAC-A, Kuraray Medical), one conventional resin cement (Panavia F2.0), three self-adhesive resin cements (Relyx Unicem, Maxcem and G-Cem), and two resin-modified glass-ionomer cements (Fuji Luting S and Vitremer) were used. Shear bond strengths, flexural strengths and elastic moduli (ISO 4049), water absorption (ISO 4049), and the expansion rate after water storage were investigated.

結果:

SAC-HおよびSAC-Aはいずれもエナメル質および象牙質との接着性を有し，金合金およびジルコニアとの接着強度は従来のレジンセメントと同等であった．SAC-HおよびSAC-Aは，市販の自己接着性レジンセメントやガラスイオノマーセメントと比較して，曲げ強さが86.4-93.5MPaと大きかった．弾性率は，自己接着性樹脂セメントが5.2〜7.4GPa，ガラスアイオノマーセメントが2.3〜3.4GPaであった．SAC-HおよびSAC-Aの吸水率（26.3～27.7microg/mm(3)）は，市販の自己接着性樹脂セメントに比べて有意に低かった．SAC-HおよびSAC-Aは，市販の自己接着性レジンセメントおよびガラスイオノマーセメントに比べ，4週間の水貯蔵後の膨張率（0.17〜0.26％）が有意に低かった．

RESULTS: Both SAC-H and SAC-A provided adhesion to enamel and dentin, and had the same bond strength to gold alloy and zirconia as conventional resin cements. SAC-H and SAC-A had greater flexural strengths (86.4-93.5MPa) than commercial self-adhesive resin cements or glass-ionomer cements. The elastic moduli of self-adhesive and glass-ionomer cements were 5.2-7.4GPa and 2.3-3.4GPa, respectively. The water absorption of SAC-H and SAC-A (26.3-27.7microg/mm(3)) were significantly lower than commercial self-adhesive resin cements. SAC-H and SAC-A showed significantly lower expansion rates (0.17-0.26%) than commercial self-adhesive cements and glass-ionomer cements after 4 weeks water storage.

結論:

この新しい自己接着性樹脂セメントは，良好な接着性と機械的特性を示した．

CONCLUSIONS: It is suggested that the new self-adhesive resin cements exhibited a favorable bonding capability and mechanical properties.