글라스 용융침투 처리가 지르코니아와 초저온 소성 도재와의 전단결합강도에 미치는 영향
Effect of glass-infiltration treatments on the shear bond strength between zirconia and ultra low-fusing porcelain veneer
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목적: 본 연구는 글라스 용융침투 처리가 지르코니아와 초저온 소성 전장도재와의 전단결합강도에 미치는 영향을 평가하였다. 재료 및 방법: 표면처리 방법에 따라 대조군 (처리 안함), ZirLiner처리군 (ZL군), 글라스 용융침투처리군 (ZG군), 글라스 용융침투 후 Sandblasting 처리군 (ZGS군)으로 분류하였다 (n = 12). 모든 실험군은 초저온 소성 전장도재를 사용하여 지름 6 mm × 두께 3 mm가 되도록 축성하고 소성하였다. 지르코니아와 전장도재 사이의 결합강도는 만능시험기를 이용하여 측정하였고 지르코니아 시편의 결합계면, 도재파절 양상은 SEM과 EDX로 관찰하였다. 결과: 지르코니아 표면처리 방법에 따라 전장도재와의 결합강도가 ZirLiner군, 대조군, 글라스 용융침투군 순으로 나타났으나 통계학적으로 유의한 차이는 없었다 (P > .05). 글라스 용융침투 후 Sandblasting 처리군은 다른 모든 군에 비해 유의하게 낮은 전단결합강도를 보였다 (P < .05). 결론: 글라스 용융침투 지르코니아의 Sandblasting처리는 초저온 소성 전장도재와의 현저한 결합력 감소를 야기시키므로 사용이 제한되어야 할 것으로 사료된다.
Abstract
Purpose: This study examined the effects of glass infiltration treatments on the shear bond strength (SBS) between zirconia core and ultra low-fusing porcelain veneer. Materials and methods: The zirconia specimens were classified into 4 groups (n = 12): Untreated zirconia (group Z), zirconia coated ZirLiner (group ZL), glass-infiltrated zirconia (group ZG), glass-infiltrated and sandblasted zirconia (group ZGS). A cylinder of ultra low-fusing veneer porcelain was build up on each disk (6 mm × 3 mm). SBS was measured using a universal testing machine. Scanning electron microscope and Energy Dispersive X-ray spectroscopy were used to evaluate the surface of zirconia and failure pattern after SBS. Results: SBS value of group ZGS was significantly lower than that of other groups (P < .05). No significant differences were detected among group ZL, group Z and group ZG. Conclusion: Glass infiltration is not effective to the bond strength between zirconia and ultra low-fusing porcelain veneer. Sandblasting also dramatically decreased the bonding strength.
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