Physical properties of polyamide-12 versus PMMA denture base material.
Physical properties of polyamide-12 versus PMMA denture base material.
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DOI：
10.1155/2014/150298
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发表时间：
2014
影响因子：
--
通讯作者：
Boening KW
中科院分区：
文献类型：
--
作者：
Wieckiewicz M;Opitz V;Richter G;Boening KW
目标。聚酰胺 12 (PA) 是一种适用于义齿基托和卡扣的柔性材料。本研究调查了其潜在的老化影响，重点关注表面粗糙度、颜色稳定性和弹性。方法。制作了 40 × 10 × 2mm 的 PA 样品（Valplast）和同等尺寸的 PMMA 样品（Palapress）作为对照。使用 CIE L*a*b* 颜色规范测量在空气、水、咖啡和红酒 (n = 10) 中储存后的颜色变化。通过三点弯曲测试测量热循环（1000、3000 和 7000 次循环， n = 15）后的弹性。平均表面粗糙度 (Ra) 在上述液体中储存和热循环后测定 (n = 10)。结果。 Tukey 的 HSD 测试（P < 0.05）显示，红酒（12 天后 ΔE = 4.27，12 天后 ΔE = 6.90）和咖啡（36 天后 ΔE = 3.93）中 PA 的颜色变化具有统计学意义，但 PMMA 没有颜色变化。 PA 的弹性模量为 845 MPa，不受热循环影响（Tukey's HSD 测试， P > 0.81）。干燥样本的弹性显着降低（P < 0.001）。平均表面粗糙度（PA 0.20 μm，PMMA 0.28 μm）在热循环或储存后没有显着变化（Mann-Whitney U 检验， 0.16 < P < 0.65）。意义。 PA 比 PMMA 更容易变色。人工老化不会改变 PA 的表面粗糙度和弹性。
Objectives. Polyamide-12 (PA) is a flexible material suited for denture bases and clasping. This study investigated its potential aging effects with a focus on surface roughness, color stability, and elasticity. Methods. PA specimens (Valplast) of 40 × 10 × 2 mm and equally measuring PMMA specimens (Palapress) as control were fabricated. Color changes after storage in air, water, coffee, and red wine (n = 10) were measured using the CIE L*a*b* color specification. Elasticity after thermocycling (1000, 3000, and 7000 cycles, n = 15) was measured by three-point bending testing. Mean surface roughness (Ra) was determined after storage in the liquids mentioned above and thermocycling (n = 10). Results. Tukey's HSD test (P < 0.05) revealed statistically significant color changes of PA in red wine (ΔE = 4.27 after 12 days, ΔE = 6.90 after 12 days) and coffee (ΔE = 3.93 after 36 days) but no color changes in PMMA. Elastic modulus of PA was 845 MPa and not affected by thermocycling (Tukey's HSD test, P > 0.81). Dry specimens showed significantly decreased elasticity (P < 0.001). Mean surface roughness (PA 0.20 μm, PMMA 0.28 μm) did not change significantly after thermocycling or storage (Mann-Whitney U-test, 0.16 < P < 0.65). Significance. PA exhibited a higher susceptibility to discoloration than PMMA. Neither surface roughness nor elasticity of PA was altered by artificial aging.
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DOI：
10.1111/j.1532-849x.2006.00098.x
发表时间：
2006-05-01
期刊：
Journal of prosthodontics : official journal of the American College of Prosthodontists
影响因子：
--
作者：
Berger, Julie C;Driscoll, Carl F;Thompson, Geoffrey
通讯作者：
Thompson, Geoffrey
影响因子：
4.6
作者：
John, J;Gangadhar, SA;Shah, I
通讯作者：
Shah, I
影响因子：
4.4
作者：
Bagheri, R;Burrow, MF;Tyas, M
通讯作者：
Tyas, M
影响因子：
1.2
作者：
Singh, J. P.;Dhiman, R. K.;Girish, S. H.
通讯作者：
Girish, S. H.
影响因子：
2.5
作者：
Takabayashi, Yota
通讯作者：
Takabayashi, Yota