Phase transformation of dental zirconia following artificial aging.
Phase transformation of dental zirconia following artificial aging.
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人工老化后牙科氧化锆的相变。
DOI：
10.1002/jbm.b.33334
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Burgess,JohnO
中科院分区：
文献类型：
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作者：
Lucas,ThomasJ;Lawson,NathanielC;Janowski,GreggM;Burgess,JohnO
氧化钇稳定氧化锆的低温降解（LTD）会导致表面粗糙度增加，同时强度降低。本研究确定了人工老化（长时间煮沸/高压灭菌）诱导Y-TZP（氧化钇-四氧化二锆-多晶）LTD的有效性，并使用人工老化进行转变深度进展分析。零假设是老化技术测试产生相同数量的转化，转化不是时间/温度依赖性和LTD导致整个Y-TZP samples.MethodsDental-grade Y-TZP样品不断转化被随机分为九个亚组（n= 5）：收到，3.5和7天煮沸，1巴高压灭菌器（1，3，5小时），和2巴高压灭菌器（1，3，5小时）。实验后进行4 h煮沸处理（n= 2）以完成数据。使用传统的X射线衍射和低角X射线衍射测量转变。结果t → m转变的分数随老化时间增加。3.5天煮沸和2巴5小时高压釜产生类似的转化结果，而7天煮沸处理揭示了最大的转化。老化样本的表面层经历了最多的转变，而所有样本显示随着深度的减少transformation. Significance表面转变是明显的，这可能会导致粗糙的表面和增加磨损的相对牙列/材料。因此，需要利用加速老化进行针对Y-TZP LTD的磨损研究。© 2014 Wiley Periodicals，Inc. J Biomed Mater Res Part B：Appl Biomater，103 B：1519-1523，2015.
AimsLow‐temperature degradation (LTD) of yttria‐stabilized zirconia can produce increased surface roughness with a concomitant decrease in strength. This study determined the effectiveness of artificial aging (prolonged boiling/autoclaving) to induce LTD of Y‐TZP (yttria‐tetragonal zirconia‐polycrystals) and used artificial aging for transformation depth progression analyses. The null hypothesis is aging techniques tested produce the same amount of transformation, transformation is not time/temperature dependent and LTD causes a constant transformation throughout the Y‐TZP samples.MethodsDental‐grade Y‐TZP samples were randomly divided into nine subgroups (n= 5): as received, 3.5 and 7 day boiling, 1 bar autoclave (1, 3, 5 h), and 2 bar autoclave (1, 3, 5 h). A 4‐h boil treatment (n= 2) was performed post‐experiment for completion of data. Transformation was measured using traditional X‐ray diffraction and low‐angle X‐ray diffraction.ResultsThe fraction of t → m transformation increased with aging time. The 3.5 day boil and 2 bar 5 h autoclave produced similar transformation results, while the 7 day boiling treatment revealed the greatest transformation. The surface layer of the aged specimen underwent the most transformation while all samples displayed decreasing transformation with depth.SignificanceSurface transformation was evident, which can lead to rougher surfaces and increased wear of opposing dentition/materials. Therefore, wear studies addressing LTD of Y‐TZP are needed utilizing accelerated aging. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 1519–1523, 2015.