中华口腔医学研究杂志(电子版) ›› 2013, Vol. 07 ›› Issue (02) : 112 -116. doi: 10.3877/cma.j.issn.1674-1366.2013.02.006 × 扫一扫
基础研究
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Ri-zhao LI1, Qiang FU1, Li-juan LI1, Xiao-long LI1, Feng QIN1,†()
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黎日照, 付强, 李丽娟, 李小龙, 覃峰. 低温时效对牙科氧化锆陶瓷表面硬度的影响[J/OL]. 中华口腔医学研究杂志(电子版), 2013, 07(02): 112-116.
Ri-zhao LI, Qiang FU, Li-juan LI, Xiao-long LI, Feng QIN. The influence of low-temperature degradation on the surface hardness of dental zirconia ceramic[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2013, 07(02): 112-116.
目的
研究不同人工老化时间对氧化锆表面显微硬度的影响。
方法
制作20 个直径20.0 mm、厚度1.0 mm 的圆盘状氧化锆试件,分级打磨抛光后,按不同老化时间随机分为四组(n=5;A 组:0 h;B 组:5 h;C 组:10 h;D 组:15 h)在134℃、0.22 MPa 压力下按分组时间进行人工老化。 X 射线衍射分析试件表面晶相,计算单斜晶相氧化锆(m-氧化锆)含量。 在每个试件上均匀选取12 个位点进行显微硬度测量,对数值进行统计学分析。
结果
A 组试件表面未检测到m-氧化锆,B、C、D 试件m-氧化锆含量随老化时间的延长而显著增加(B:5.04% ± 0.14%;C:8.99% ± 0.24%;D:15.04% ± 0.43%)。 A、B、C、D 四组试件显微硬度值分别为(1390 ± 16)、(1391 ± 22)、(1384 ± 23)、(1370 ± 28) MPa,D 组硬度值降低,与A、B、C 组差异存在统计学意义(P<0.05)。
结论
氧化锆材料的低温时效发生量与人工老化时间有相关性;低温时效降低氧化锆表面显微硬度。
Objective
To investigate the influence of different artificial time on the surface hardness of zirconia.
Methods
20 zirconia specimens in 20.0 mm (diameter) × 1.0 mm (height) were fabricated. After grinded and polished,all specimens were randomly divided into 4 groups (n=5,group A: 0 h; group B: 5 h; group C: 10 h; group D: 15 h) and received different period of artificial aging in autoclave at 134℃with 0.22 MPa,respectively. After aging,the m phase fraction was determined by X-ray diffraction analysis. Micro-hardness tests were performed at 12 points in each specimen,and then the hardness values were statistically analyzed.
Results
No m phase was detected in group A. M phase content increased significantly with longer aging time (B: 5.04% ± 0.14%; C: 8.99% ± 0.24%; D:15.04% ± 0.43%). The micro-hardness value (MPa) of each group were statistically analyzed (A: 1390± 16; B: 1391 ± 22; C: 1384 ± 23; D: 1370 ± 28),micro-hardness of group D was decreased with statistical significance (P<0.05).
Conclusion
The amount of low-temperature degradation of zirconia is related to the time of artificial aging. Low-temperature degradation significantly decreases the surface hardness of zirconia.