Hamid Doaa N, Al-Khatieeb Mustafa M
Department of Orthodontics, College of Dentistry, University of Baghdad, Iraq.
J Orthod Sci. 2024 Nov 25;13:41. doi: 10.4103/jos.jos_61_24. eCollection 2024.
As patients are instructed to wear thermoplastic retainers for the rest of their lives, the durability of the materials is a critical factor in evaluating whether the expense is justified. This study examined the physical and mechanical properties of three different thermoplastic retainer materials before and after thermoforming (BT and AT).
Clear Advantage Series I, Clear Advantage Series II, and Leone types were used, with each material having a thickness of 1 mm. The materials' tensile force, hardness, and water absorption tests have been measured for 90 thermoformed and 90 non-thermoformed specimens (30 specimens from each material).
The tensile force, hardness, and water absorption values of all the materials differed significantly ( ≤ 0.05) BT. Additionally, the majority of the materials showed significant differences in water absorption, hardness, and tensile force ( ≤ 0.05) AT, except the Leone materials, and Clear Advantage Series I did not significantly differ in the case of hardness value. All studied materials showed an increase in hardness and water absorption AT ( ≤ 0.05). At the same time, all of the studied materials showed a significant decrease in tensile force after thermoforming.
Thermoforming increases the material's water absorption while decreasing its stiffness, affecting its mechanical and physical properties. Clear Advantage Series II (PP) stood out with superior flexibility, wear resistance, and minimal water absorption compared to other materials, highlighting its durability and superiority.
由于患者需终身佩戴热塑性保持器，材料的耐用性是评估费用是否合理的关键因素。本研究检测了三种不同热塑性保持器材料在热成型前后（热成型前和热成型后）的物理和力学性能。
使用了Clear Advantage Series I、Clear Advantage Series II和Leone型号，每种材料厚度均为1毫米。对90个热成型和90个未热成型的试样（每种材料30个试样）进行了材料的拉伸力、硬度和吸水性测试。
所有材料的拉伸力、硬度和吸水性值在热成型前均有显著差异（P≤0.05）。此外，除Leone材料外，大多数材料在热成型后的吸水性、硬度和拉伸力方面存在显著差异（P≤0.05），Clear Advantage Series I在硬度值方面无显著差异。所有研究材料在热成型后硬度和吸水性均增加（P≤0.05）。同时，所有研究材料在热成型后拉伸力均显著降低。
热成型增加了材料的吸水性，同时降低了其刚度，影响其力学和物理性能。与其他材料相比，Clear Advantage Series II（聚丙烯）具有卓越的柔韧性、耐磨性和最小的吸水性，突出了其耐用性和优越性。
