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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

基础研究

低温时效对牙科氧化锆陶瓷表面硬度的影响
黎日照1, 付强1, 李丽娟1, 李小龙1, 覃峰1,()   
  1. 1. 510055 广州,中山大学光华口腔医学院·附属口腔医院,广东省口腔医学重点实验室
  • 收稿日期:2012-11-22 出版日期:2013-04-01
  • 通信作者: 覃峰
  • 基金资助:
    广东省科技计划(2011B031300018)

The influence of low-temperature degradation on the surface hardness of dental zirconia ceramic

Ri-zhao LI1, Qiang FU1, Li-juan LI1, Xiao-long LI1, Feng QIN1,()   

  1. 1. Guanghua School of Stomatology,Hospital of Stomatology,Sun Yat-sen University,Guangdong Provincial Key Laboratory of Stomatology,Guangzhou 510055,China
  • Received:2012-11-22 Published:2013-04-01
  • Corresponding author: Feng QIN
引用本文:

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.

表1 各组试件不同时间老化后表面m-氧化锆含量(%)
图1 各组试件老化后X 线衍射分析结果
表2 各组试件显微硬度值(MPa)
图2 各组试件显微硬度值箱式图
图3 各组试件显微硬度压痕点图像 可见左侧图B、D、F 中压痕周围粗糙感明显,左上角标示对应数值(MPa),图A 为A 组位点,图B、C 为B 组,图C、D 为C 组,图F、G 为D 组
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