치과용 파일의 EDTA용액에서 코팅물질에 따른 피로파절 표면
Fatigue Fractured Surface of Dental File in EDTA Solution with Coating Materials
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It is important to improve fatigue fracture characteristics when using dental Ni-Ti files in EDTA solution clinically. This is necessary to prevent fracture during a treatment process such as a root canal. To improve this problem, fatigue fractured surface of dental file in EDTA solution with different coating materials was investigated. In the non-coated case, there were mechanical defects. However, when DLC was used for coating, the surface roughness was reduced. In the case of TiN coating, the surface roughness was reduced compared to that of TiAlN coating. Elements constituting the coating film were uniformly detected on the coated surface. The hardness of the DLC coating film was the highest. The elastic modulus of the DLC coating film was lower than that of TiAlN or TiN. TiN showed the best adhesion of the coating film while DLC showed the lowest. In the EDTA solution, DLC showed small bending deformation, while TiAlN and TiN showed large bending deformation. In the clinical fracture test, the time until fracture was the shortest for the non-coated case and the longest for the DLC coating. The coated file showed a reduced wall frac- ture area and fatigue striation compared to the non-coated specimen.
Abstract
It is important to improve fatigue fracture characteristics when using dental Ni-Ti files in EDTA solution clinically. This is necessary to prevent fracture during a treatment process such as a root canal. To improve this problem, fatigue fractured surface of dental file in EDTA solution with different coating materials was investigated. In the non-coated case, there were mechanical defects. However, when DLC was used for coating, the surface roughness was reduced. In the case of TiN coating, the surface roughness was reduced compared to that of TiAlN coating. Elements constituting the coating film were uniformly detected on the coated surface. The hardness of the DLC coating film was the highest. The elastic modulus of the DLC coating film was lower than that of TiAlN or TiN. TiN showed the best adhesion of the coating film while DLC showed the lowest. In the EDTA solution, DLC showed small bending deformation, while TiAlN and TiN showed large bending deformation. In the clinical fracture test, the time until fracture was the shortest for the non-coated case and the longest for the DLC coating. The coated file showed a reduced wall frac- ture area and fatigue striation compared to the non-coated specimen.