CAD/CAMセラミック修復物の接着に及ぼす修復物の種類と接着性レジンセメント系の違いの影響

Effect of differences in the type of restoration and adhesive resin cement system on the bonding of CAD/CAM ceramic restorations.

• Seisuke Koshida
• Masahiko Maeno
• Yoichiro Nara

抄録

周期的負荷後のCAD/CAMセラミック修復物の接着に及ぼす修復物の種類と接着性レジンセメント系の違いの影響を定量的および定性的に検討した．ヒト上顎第一大臼歯72本を3つの修復物群に分けた．MODインレー，MODPオ ンレー，クラウンの3つの修復群に分けた．準備されたすべての修復物の露出象牙質に即時象牙質封鎖を行った。各修復物群の24本の標本をさらに3つの群に分け、それぞれの群に異なる接着性レジンセメントシステムを適用してセメント化を行った。すべての修復物は、長繊維セラミックブロックから作製し、メーカーの指示に従って各接着性レジンセメント系を用いてセメント化した。微小引張ボンド強度は繰返し荷重後に測定したが，修復物の種類や接着性レジンセメント系の違いによって有意な影響を受けなかった．しかし，修復物の種類や接着性レジンセメント系の違いにより，接着信頼性に有意な差が認められた．

The effect of differences in the type of restoration and adhesive resin cement system on the bonding of CAD/CAM ceramic restoration after cyclic loading was examined quantitatively and qualitatively. Seventy-two human maxillary first molars were divided into three restoration groups: MOD-inlay, MODP-onlay, and crown. Immediate dentin sealing was applied to the exposed dentin of all prepared specimens. The 24 specimens of each restoration group were further divided into another three groups, and a different adhesive resin cement system was applied to each group for cementation. All restoratives were fabricated from feldspathic-ceramic-blocks and cemented with each adhesive resin cement system according to the manufacturer's instructions. The microtensile bond-strength was measured after cyclic loading and was not significantly affected by differences in the type of restoration or adhesive resin cement system. However, the type of restorations and adhesive resin cement systems did show significant differences in terms of the bonding reliability.