Vallittu P K
Department of Prosthetics and Stomatognathic, Physiology, University of Kuopio, Finland.
J Prosthodont. 1996 Jun;5(2):115-21. doi: 10.1111/j.1532-849x.1996.tb00285.x.
The fatigue resistance of heat-polymerized acrylic resin test specimens reinforced with continuous glass fibers or metal wire was investigated.
Test specimens in the shape of maxillary removable partial dentures were reinforced with one of the following: (1) circular steel wire (cross-sectional diameter, 1.0 mm); (2) semicircular steel wire (cross-sectional diameter, 1.0 x 2.0 mm); or (3) continuous unidirectional E-glass fibers. Ten specimens were fabricated for each test group. The specimens were tested by a constant force flexural fatigue test at a force of 180 N while immersed in 37 degrees C water. The number of loading cycles required to generate a fatigue fracture and the position of the fracture were measured.
Results showed that the test specimens, which were either unreinforced or reinforced with metal wires, fractured after 13,197 to 39,237 loading cycles. For the glass fiber-reinforced test specimens, the fracture did not coincide with the region of the strengthener but with the opposite side of the test specimen after 1,239,298 loading cycles. The position of the fracture showed a statistically significant variation between the test groups (P < .001).
This study suggests that the fatigue resistance of acrylic resin removable partial dentures reinforced with glass fibers are superior to those removable partial dentures reinforced with conventional metal wire.
研究用连续玻璃纤维或金属丝增强的热聚合丙烯酸树脂测试样本的抗疲劳性。
以上颌可摘局部义齿形状制作测试样本，并采用以下材料之一进行增强：（1）圆形钢丝（横截面直径1.0毫米）；（2）半圆形钢丝（横截面直径1.0×2.0毫米）；或（3）连续单向E玻璃纤维。每个测试组制作10个样本。将样本浸入37℃水中，以180牛的恒定力进行弯曲疲劳测试。测量产生疲劳断裂所需的加载循环次数以及断裂位置。
结果表明，未增强或用金属丝增强的测试样本在13197至39237次加载循环后发生断裂。对于玻璃纤维增强的测试样本，在1239298次加载循环后，断裂并非发生在增强材料所在区域，而是在样本的另一侧。各测试组之间的断裂位置存在统计学显著差异（P <.001）。
本研究表明，玻璃纤维增强的丙烯酸树脂可摘局部义齿的抗疲劳性优于传统金属丝增强的可摘局部义齿。
