Amsellem Pierre M, Egger Erick L, Wilson Daniel L
Department of Clinical Sciences, Colorado State University, Fort Collins, CO, USA.
Vet Surg. 2010 Jul;39(5):631-7. doi: 10.1111/j.1532-950X.2009.00639.x.
To (1) mechanically evaluate polymethylmethacrylate (PMMA) columns of various sizes and compare them to connecting bar materials (carbon fiber composite, titanium, stainless steel) and (2) compare the properties of an intact PMMA column to those of an acrylic interface.
Experimental mechanical study.
Experiment 1: 6 groups of 6 specimens each; experiment 2: 2 groups of 12 specimens each.
All specimens were tested in 3-point bending. Stiffness, yield strength, and ultimate strength values were calculated for each specimen.
PMMA 1 columns (23.25 mm) compared favorably to titanium or stainless-steel bars. PMMA 3 columns (30.15 mm) and carbon fiber bars had similar yield strength but PMMA 3 columns were less stiff than carbon fiber bars. PMMA 3 columns had lower bending modulus and a higher variability in their mechanical properties than PMMA 1 or PMMA 2 (25.64 mm) columns. Acrylic interface specimens were less strong but as stiff as intact specimens.
An acrylic interface was easily created and had acceptable biomechanical characteristics.
PMMA 2 and PMMA 3 columns are not recommended for clinical use at this time. Further tests are needed to analyze an acrylic patch in a more clinically relevant loading model.
（1）对不同尺寸的聚甲基丙烯酸甲酯（PMMA）柱进行力学评估，并将其与连接杆材料（碳纤维复合材料、钛、不锈钢）进行比较；（2）比较完整PMMA柱与丙烯酸界面的性能。
实验力学研究。
实验1：6组，每组6个标本；实验2：2组，每组12个标本。
所有标本均进行三点弯曲测试。计算每个标本的刚度、屈服强度和极限强度值。
PMMA 1柱（23.25毫米）与钛或不锈钢棒相比具有优势。PMMA 3柱（30.15毫米）和碳纤维棒具有相似的屈服强度，但PMMA 3柱的刚度低于碳纤维棒。与PMMA 1或PMMA 2（25.64毫米）柱相比，PMMA 3柱的弯曲模量较低，力学性能变异性较高。丙烯酸界面标本强度较低，但刚度与完整标本相同。
丙烯酸界面易于创建，具有可接受的生物力学特性。
目前不建议临床使用PMMA 2和PMMA 3柱。需要进一步测试以在更具临床相关性的加载模型中分析丙烯酸补片。
