Gopichander N, Halini Kumarai K V, Vasanthakumar M
Department of Prosthodontics, SRM Dental College, Ramapuram, Chennai, India.
Department of Prosthodontics, Sri Sai Dental College and Research Institute, Srikakulam, India.
Saudi Dent J. 2015 Oct;27(4):194-200. doi: 10.1016/j.sdentj.2015.03.002. Epub 2015 Sep 1.
Different reinforcements currently available for interim fixed partial denture (FPD) materials do not provide the ideal strength for long-term use. Therefore, the aim of this investigation was to develop a more ideal provisional material for long-term use with better mechanical properties. This study evaluated the effectiveness of polyester fiber reinforcement on different interim FPD materials.
Thirty resin-bonded FPDs were constructed from three provisional interim FPD materials. Specimens were tested with a universal testing machine (UTM). The modulus of elasticity and flexural strength were recorded in MPa. The compressive strength and degree of deflection were calculated from the obtained values, and a two-way analysis of variance (ANOVA) was used to determine the significance.
The polyester fiber reinforcement increased the mechanical properties. The modulus of elasticity for heat-polymerized polymethyl methacrylate (PMMA) was 624 MPa, compared to 700.2 MPa for the reinforced heat-cured sample. The flexural strengths of the bis-acrylic and cold-polymerized reinforced samples increased significantly to 2807 MPa and 979.86 MPa, respectively, compared to the nonreinforced samples. The mean compressive strength of the reinforced cold-polymerized PMMA samples was 439.17 MPa; and for the reinforced heat-polymerized PMMA samples, it was 1117.41 MPa. The degree of deflection was significantly greater (P < 0.05) in the reinforced bis-acrylic sample (5.03 MPa), compared with the nonreinforced bis-acrylic sample (2.95 MPa).
Within the limitations of this study, polyester fiber reinforcements improved the mechanical properties of heat-polymerized PMMA, cold-polymerized PMMA, and bis-acrylic provisional FPD materials.
目前可用于临时固定局部义齿（FPD）材料的不同增强材料并不能为长期使用提供理想的强度。因此，本研究的目的是开发一种具有更理想机械性能的长期使用的临时材料。本研究评估了聚酯纤维增强对不同临时FPD材料的有效性。
用三种临时FPD材料制作30个树脂粘结FPD。用万能试验机（UTM）对试件进行测试。弹性模量和弯曲强度以兆帕（MPa）记录。根据所得值计算抗压强度和挠曲度，并采用双向方差分析（ANOVA）确定其显著性。
聚酯纤维增强提高了机械性能。热聚合聚甲基丙烯酸甲酯（PMMA）的弹性模量为624MPa，而增强热固化样品的弹性模量为700.2MPa。与未增强样品相比，双丙烯酸和冷聚合增强样品的弯曲强度分别显著提高到2807MPa和979.86MPa。增强冷聚合PMMA样品的平均抗压强度为439.17MPa；增强热聚合PMMA样品的平均抗压强度为1117.41MPa。与未增强的双丙烯酸样品（2.95MPa）相比，增强双丙烯酸样品（5.03MPa）的挠曲度显著更大（P<0.05）。
在本研究的局限性内，聚酯纤维增强改善了热聚合PMMA、冷聚合PMMA和双丙烯酸临时FPD材料的机械性能。
