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KMID : 0362220120390010065
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Journal of The Korean Research Society for Dental Materials
2012 Volume.39 No. 1 p.65 ~ p.74
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Reinforcing Effect of Fiber Type and Orientation on Maxillary Complete Denture
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Yu Sang-Hui
Park Da-Ryeong
Oh Seung-Han
Bae Ji-Myung
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Abstract
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The fracture of denture base resin occurs due to repeated loading caused by masticatory forces or accidental dropping. One method strengthening denture base resin is the addition of reinforcing fibers to resin. The aim of this study was to evaluate the effect of glass and aramid fibers according to the fiber orientation on maxillary complete denture. In the study of denture model, maxillary complete denture was fabricated with auto-polymerized resin(Vertex SC). Glass fiber and polyaromatic polyamide fiber(aramid) were used in unidirectional and bidirectional orientation to reinforce the maxillary complete denture. The maxillary complete denture without fibers was used as a control. The flexural strengths, moduli and toughness of the denture were measured with and without silicone maxillary cast, respectively. The specimens of each group were stored in distilled water at for 50 hours before test. The flexural strengths, moduli and toughness were measured with a universal testing machine at a crosshead speed of 5 mm/min in a three-point bending mode. For flexural strengths, there were no significant differences according to the fiber type and orientation. The flexural strength of bidirectional glass fiber and unidirectional aramid fiber with silicone cast denture were significantly higher than those without silicone cast denture. However, the flexural modulus of unidirectional aramid fiber was significantly higher than those of other experimental groups and the control at test without silicone cast. The flexural modulus of unidirectional aramid fiber and bidirectional glass fiber without silicone cast denture were significantly higher than those without silicone cast denture. For the toughness, the bidirectional glass fiber with silicone cast were significantly higher than those of other experimental groups and the control, with the exception of unidirectional aramid fiber. The toughness of control, bidirectional glass fiber and unidirectional aramid fiber with silicone cast denture were significantly higher than those without silicone cast denture. In this study, bidirectional glass fiber and unidirectional aramid fiber showed the significant reinforcing effect on maxillary complete denture in terms of flexural modulus and toughness.
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KEYWORD
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Complete denture, Fiber-reinforced composite (FRC), Fiber orientation, Glass fiber, Polyaromatic polyamide fiber
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