Tacir I H, Kama J D, Zortuk M, Eskimez S
Department of Prosthodontics, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey.
Aust Dent J. 2006 Mar;51(1):52-6. doi: 10.1111/j.1834-7819.2006.tb00401.x.
In recent years, glass fibres have been used to strengthen denture base resins. A major difficulty in using reinforcing fibres with multiphase acrylic resins, such as powder liquid resins, is inadequate impregnation of the fibres with the resin.
This investigation examined the reinforcing effect of glass fibres on the fracture resistance and flexural strength of acrylic denture base resins. Eighty identical specimens were formed in specially designed moulds in accordance with the manufacturer's recommendations. The four experimental groups were prepared and these consisted of conventional acrylic resin and the same resin reinforced with glass fibres. Ten specimens were fabricated in a standardized fashion for each experimental group. Flexural strength was tested using a 3-point universal testing machine.
In this study, statistically significant differences were found in the flexural strength of the specimens (P < 0.05). The injection-moulded, fibre-reinforced group had significantly lower flexural strength than the injection-moulded group (P < 0.001), strength than the microwave-moulded, fibre-reinforced group (P < 0.001), and the microwave-moulded, fibre-reinforced group had lower flexural strength than the microwave-moulded group. The fracture resistance was significantly higher in the injection-moulded, fibre-reinforced group than in the injection-moulded group (P < 0.05), and the fracture resistance was significantly higher in the microwave-moulded, fibre-reinforced group than in the microwave-moulded group.
Within the limitations of this study, the flexural strength of heat-polymerized PMMA denture resin was improved after reinforcement with glass fibres. It may be possible to apply these results to distal extension partial and complete denture bases.
近年来，玻璃纤维已被用于增强义齿基托树脂。将增强纤维用于多相丙烯酸树脂（如粉液型树脂）时，一个主要困难是树脂对纤维的浸渍不足。
本研究考察了玻璃纤维对丙烯酸义齿基托树脂抗折性和弯曲强度的增强效果。按照制造商的建议，在专门设计的模具中制作了80个相同的标本。制备了四个实验组，包括传统丙烯酸树脂和用玻璃纤维增强的相同树脂。每个实验组以标准化方式制作10个标本。使用三点式万能试验机测试弯曲强度。
在本研究中，标本的弯曲强度存在统计学显著差异（P < 0.05）。注塑纤维增强组的弯曲强度明显低于注塑组（P < 0.001），低于微波成型纤维增强组（P < 0.001），且微波成型纤维增强组的弯曲强度低于微波成型组。注塑纤维增强组的抗折性明显高于注塑组（P < 0.05），微波成型纤维增强组的抗折性明显高于微波成型组。
在本研究的局限性内，用玻璃纤维增强后，热聚合PMMA义齿树脂的弯曲强度得到了提高。有可能将这些结果应用于远中游离端局部义齿和全口义齿基托。
