CAD/CAMレジンセラミック材料と歯のエナメル質の衝撃すべり摩耗挙動に関する比較研究

Comparative study on the impact-sliding wear behaviour of CAD/CAM resin-ceramic materials and tooth enamel.

抄録

目的:

異なるCAD/CAMレジンセラミック材料と歯のエナメル質の衝撃すべり摩耗を比較し、対応する摩耗損傷メカニズムを探る。

OBJECTIVES: To compare the impact-sliding wear of different CAD/CAM resin-ceramic materials and tooth enamel, and explore the corresponding wear damage mechanism.

方法:

本研究では、ヒト歯エナメル質（EN）、Vita ENAMIC（Vita、VE）、Lava Ultimate（3M、LU）、GC CERASMART（GC、CS）を使用した。試料の硬度、弾性率、粗さ値を測定した。さらに、球状ジルコニア拮抗材を用いたボール・オン・フラット構成で衝撃すべり摩耗試験を実施し、摩擦係数（CoF）を同時に記録した。さらに、白色光干渉計を使用して体積損失を測定し、走査型電子顕微鏡を使用して摩耗痕の摩耗形態と垂直断面の損傷特徴を観察し、衝撃すべり摩耗試験中の損傷メカニズムを明らかにした。

METHODS: Human tooth enamel (EN), Vita ENAMIC (Vita, VE), Lava Ultimate (3 M, LU), and GC CERASMART (GC, CS) were used in this study. The hardness, elastic modulus, and roughness values of the samples were measured. Further, impact-sliding wear tests were performed in a ball-on-flat configuration with spherical zirconia antagonists and the coefficients of friction (CoF) were recorded simultaneously. Additionally, a white light interferometer was used to determine the volume losses and scanning electron microscopy was used to observe the wear morphology of the wear scars and the damage feature in the vertical sections to clarify the damage mechanism during the impact-sliding wear test.

結果:

ENが最も高い弾性率とCoFを示し、VE、LU、CSがこれに続いた。ENとVEの硬度と粗さは同程度で、LUとCSよりも高かった。摩耗試験を通じて、VEは最も高い体積損失を示し、CSは最も低い体積損失を示した。VEの摩耗損傷特性はENと類似しており、衝撃部では無機物質の脆性破壊と有機物質の塑性変形を示し、摺動部ではプラウマークを示した。LUとCSの場合、摩耗部全体が樹脂マトリックスの塑性変形、フィラー粒子の剥離、プラウマークを示した。

RESULTS: EN exhibited the highest elastic modulus and CoF, followed by VE, LU, and CS. The hardness and roughness of EN and VE were similar and were higher than those of LU and CS. Throughout the wear tests, VE exhibited the highest volume loss, whereas CS exhibited the lowest. The wear damage characteristics of VE were similar to those of EN, displaying brittle fractures of inorganic substances and plastic deformation of organic substances in the impact part, exhibiting plough marks in the sliding parts. In the case of LU and CS, the entire wear areas displayed plastic deformation of the resin matrix, exfoliation of the filler particles, and plough marks.

意義:

エナメルおよびポリマー浸透セラミックネットワーク材料は、同様の摩耗損傷モードを示す。さらに、高密度ナノコンポジット樹脂材料は、トライボロジーの観点から衝撃すべり摩耗に最も強い。

SIGNIFICANCE: Enamel and polymer-infiltrated ceramic network materials exhibit similar wear damage modes. Additionally, the high-density nanocomposite resin material is the most resistant to impact-sliding wear from a tribological perspective.