Department of Biomaterials, Dental School, University of Athens, 2 Thivon Str, 115 27, Athens, Greece.
Division of Removable Prosthodontics, Dental School, University of Athens, Athens, Greece.
Odontology. 2011 Jan;99(1):77-82. doi: 10.1007/s10266-010-0135-2. Epub 2011 Jan 27.
We aimed to evaluate the effect of a denture cleanser and NaOCl 5.25% solution on the modulus of elasticity, the ultimate stress, and the weight changes of Co-Cr and Ti-6Al-7Nb alloys. To evaluate the modulus of elasticity and ultimate stress, 24 Co-Cr and 24 Ti-6Al-7Nb castings were fabricated, immersed in Corega Extradent, NaOCl 5.25%, or water in subgroups of six each. Thirty-six castings were produced to evaluate weight changes, 18 Co-Cr and 18 Ti-6Al-7Nb, and immersed in Corega Extradent, NaOCl 5.25%, or water in subgroups of six each. Changes in the modulus of elasticity, ultimate stress, and weight were calculated before and after immersion in the cleanser or NaOCl 5.25% solution for 45 cycles of 10 min each. Two-way analysis of variance ANOVA and Tukey's test at α = 0.05 were used to analyze the data. The modulus of elasticity and the ultimate stress of Co-Cr decreased after immersion in the solutions. The same properties of Ti-6Al-7Nb decreased in NaOCl 5.25% and increased in the other solutions. Weight loss was observed in Co-Cr alloy in both Corega Extradent and NaOCl 5.25%. A weight increase was observed in Co-Cr in water. An increase was observed in Ti-6Al-7Nb in Corega Extradent, NaOCl 5.25%, and water. The highest decrease (P = 0.05) in the modulus of elasticity and ultimate stress in Co-Cr were observed in NaOCl 5.25%, whereas no statistically significant differences (P > 0.05) were observed in Ti-6Al-7Nb in any of the solutions. A statistically significant weight loss (P < 0.05) was observed when Co-Cr was immersed in NaOCl 5.25%, and a statistically significant weight increase (P > 0.05) was observed when Ti-6Al-7Nb was immersed in Corega Extradent. The Co-Cr alloy bending properties after immersion fulfilled ADA Specification No. 14 for satisfactory clinical performance.
我们旨在评估假牙清洁剂和 5.25%次氯酸钠溶液对 Co-Cr 和 Ti-6Al-7Nb 合金弹性模量、极限应力和重量变化的影响。为了评估弹性模量和极限应力，我们制作了 24 个 Co-Cr 和 24 个 Ti-6Al-7Nb 铸件，将它们分别浸泡在 Corega Extradent、5.25%次氯酸钠或水中的六个亚组中。为了评估重量变化，我们生产了 36 个铸件，其中 18 个 Co-Cr 和 18 个 Ti-6Al-7Nb，将它们分别浸泡在 Corega Extradent、5.25%次氯酸钠或水中的六个亚组中。在每个清洁剂或 5.25%次氯酸钠溶液中浸泡 45 个 10 分钟循环后，测量弹性模量、极限应力和重量的变化。使用双因素方差分析（ANOVA）和 Tukey 检验（α=0.05）分析数据。Co-Cr 的弹性模量和极限应力在浸泡在溶液后降低。Ti-6Al-7Nb 的相同特性在 5.25%次氯酸钠和其他溶液中降低，在水中增加。Co-Cr 合金在 Corega Extradent 和 5.25%次氯酸钠中都出现了重量损失。Co-Cr 在水中的重量增加。Ti-6Al-7Nb 在 Corega Extradent、5.25%次氯酸钠和水中都出现了增加。Co-Cr 中弹性模量和极限应力的最大降低（P=0.05）发生在 5.25%次氯酸钠中，而 Ti-6Al-7Nb 在任何溶液中均未观察到统计学上显著的差异（P>0.05）。Co-Cr 浸泡在 5.25%次氯酸钠中时，重量出现了统计学上显著的损失（P<0.05），而 Ti-6Al-7Nb 浸泡在 Corega Extradent 中时，重量出现了统计学上显著的增加（P>0.05）。Co-Cr 合金浸泡后的弯曲性能符合 ADA 规范 No.14 的满意临床性能要求。
