Murata Hiroshi, Seo Rosangela Seiko, Hamada Taizo, Polyzois Gregory L, Frangou Mary J
Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan.
J Prosthet Dent. 2007 Oct;98(4):319-26. doi: 10.1016/S0022-3913(07)60105-X.
Dynamic mechanical properties of hard, direct reline resins are important factors in the clinical success of dentures. However, little information is available on the nature of these properties.
This study evaluated the dynamic mechanical properties of a variety of hard, direct reline resins: (1) visible light-polymerized, powder-liquid type, (2) visible light-polymerized, paste-type, (3) autopolymerized, powder-liquid type, as classified by component composition and mode of polymerization activation, namely, type of delivery system, and (4) heat-polymerized denture base materials.
The dynamic mechanical analysis (DMA) of 8 commercial hard denture reline materials (HDR) (2 visible light-polymerized, powder-liquid type, 4 visible light-polymerized, paste-type, and 2 autopolymerized, powder-liquid type), and 2 heat-polymerized denture base materials was obtained at a frequency of 1 Hz at 37 degrees C. Five specimens of each material, 40.0 x 7.0 x 2.0 mm, were made to measure the elastic (storage) (E') and inelastic (loss) (E'') moduli, and loss tangent (tan delta). These parameters were compared with MANOVA and Student-Newman-Keuls test (alpha =.05).
The E' values of 3 visible light-polymerized, paste-type reline resins were significantly higher than those of the other 5 reline resins. However, the E' values of all reline resins were significantly lower than those of the 2 heat-polymerized denture base resins. Except for 1 autopolymerized reliner, all reline materials had significantly lower E'' than the heat-polymerized denture base resins. The tan delta values of all but 1 visible light- and autopolymerized reliners were significantly higher than those of the heat-polymerized denture base materials.
Three visible light-polymerized, paste-type reline resins showed greater stiffness than the visible light- or autopolymerized, powder-liquid type reline resins. However, all of the hard, direct reline resins, including the 3 paste-type materials, exhibited greater flexibility compared to the heat-polymerized denture base resins.
硬质直接重衬树脂的动态力学性能是义齿临床成功的重要因素。然而，关于这些性能的本质，现有信息很少。
本研究评估了多种硬质直接重衬树脂的动态力学性能：（1）可见光聚合、粉液型，（2）可见光聚合、糊剂型，（3）自凝、粉液型，按成分组成和聚合活化方式分类，即给药系统类型，以及（4）热聚合义齿基托材料。
在37℃下，以1Hz的频率对8种市售硬质义齿重衬材料（HDR）（2种可见光聚合、粉液型，4种可见光聚合、糊剂型，2种自凝、粉液型）和2种热聚合义齿基托材料进行动态力学分析（DMA）。每种材料制作5个尺寸为40.0×7.0×2.0mm的试样，以测量弹性（储能）（E'）和非弹性（损耗）（E''）模量以及损耗角正切（tanδ）。这些参数通过多变量方差分析（MANOVA）和Student-Newman-Keuls检验进行比较（α = 0.05）。
3种可见光聚合、糊剂型重衬树脂的E'值显著高于其他5种重衬树脂。然而，所有重衬树脂的E'值均显著低于2种热聚合义齿基托树脂。除1种自凝重衬材料外，所有重衬材料的E''均显著低于热聚合义齿基托树脂。除1种可见光和自凝重衬材料外，所有重衬材料的tanδ值均显著高于热聚合义齿基托材料。
3种可见光聚合、糊剂型重衬树脂比可见光或自凝、粉液型重衬树脂具有更高的硬度。然而，所有硬质直接重衬树脂，包括3种糊剂型材料，与热聚合义齿基托树脂相比，均表现出更大的柔韧性。
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