氧化鋯表面改質對樹脂黏合劑與氧化鋯間黏結強度的影響

本研究主要之目的為對氧化鋯進行表面改質，並探討樹脂黏合劑與氧化鋯之間的黏結強度。本研究使用了3種臨床常用的自酸蝕樹脂黏合劑與1種高透牙科氧化鋯，分別採用氧化鋁噴砂和浸泡4M氫氧化鈉與1g氮化矽溶液對氧化鋯進行表面處理。實驗分組為對照組、噴砂組和浸泡組(浸泡3、5和10天後，再分別加熱處理進行1000°C和1400°C)。利用SEM和EDS對試片的表面形貌與元素組成分析，測試氧化鋯表面的接觸角和粗糙度，及使用測試經1000次和5000次冷熱循環前後試片的黏著強度。實驗結果顯示:SEM觀察到經過表面處理後的氧化鋯表面結構與對照組不同，EDS發現經過浸泡後的各組氧化鋯表面都有矽元素存在。所有實驗組試片的表面粗糙度(Ra)增加0.3 - 0.5 μm，與對照組有統計差異（p < 0.05），且接觸角比較對照組顯著減小（p < 0.05）。噴砂組與浸泡氫氧化鈉與氮化矽5天後加熱1000℃組的剪切強度都顯著高於對照組（p < 0.05）;經冷熱循環後各實驗組試片的剪切強度均降低。本研究的結論是以噴砂和浸泡氫氧化鈉與氮化矽5天進行氧化鋯表面處理的方法，可以改變氧化鋯表面的微結構和親水性，對改善氧化鋯與樹脂黏合劑的結合強度有顯著的效果。

The purpose of this study was to evaluate the influence of sandblasting and silicon-coating method on the bond strength between the resin cements and zirconia ceramics. Three clinically commonly self-etching resin cements and a highly transparent zirconia for CAD/CAM were used. In the experimental groups, the zirconia specimens were sandblasted with alumina powder or soaked in 4M NaOH-Si3N4 solution for a few days. The experimental groups include the control group, the sandblasting group and the soaking groups. The surface morphology and element composition of the zirconia surface were observed and analyzed by SEM and EDS. The surface roughness (Ra) and contact angle of the specimen were also tested. The bond strength between resin cement and zirconia ceramics with and without thermocycling test were also measured by the shear bond test. Experimental results show that the surface structure of zirconia after surface treatment was different from that control group by SEM, there was Si element on the zirconia surface in the soaking group. The surface roughness (Ra) of zirconia specimens was range of 0.3-0.6 μm. The contact angles of the specimens in soaking groups were significantly smaller than that of control group (p<0.05). The shear bond strength of the specimens with sandblasting, and soaking in NaOH-Si3N4 solution for 5 days and then heat treatment at 1000 °C were significantly higher than that of control group (p<0.05). Thermocycling decreased the bond strengths significantly after all of the surface treatment methods tested. The results suggested that the microstructures and hydrophilic of zirconia surface could be changed by sandblasting and silicon-coating method. They could be improving the bond strength of zirconia and resin cements.