Division of Removable Prosthodontics, Fukuoka Dental College, Japan.
Acta Odontol Scand. 2011 Jul;69(4):215-21. doi: 10.3109/00016357.2010.549506. Epub 2011 Jan 31.
Objective. To evaluate the effect of the location of glass fiber-reinforced composite (FRC) reinforcement on the flexural load at the proportional limit (FL-PL) and the flexural deflection of a maxillary acrylic resin complete denture. Material and methods. Maxillary acrylic resin complete dentures strengthened with and without FRC reinforcement were tested. The polymerized FRC was embedded in the denture base resin in the doughy state and placed (1) under the ridge lap region, (2) in the anterior region, (3) in the middle region or (4) in the anterior and posterior regions. The FL-PL and flexural deflection value at the 100-N loading point of the reinforced maxillary denture specimens were tested. Results. All of the reinforced dentures had a higher FL-PL than the denture without reinforcement but the FL-PL values of all the dentures were not significantly different from each other. The efficiency of the FRC reinforcement compared to the unreinforced denture was 1.54-1.75 times greater. All of the reinforced dentures showed significantly lower deflection compared to the unreinforced denture, but the flexural deflections of all the dentures were not significantly different from each other. Conclusions. The location of the FRC reinforcement did not affect the fracture resistance of the maxillary acrylic resin complete denture. All of the reinforced dentures had higher FL-PL and lower flexural deflection than the denture without reinforcement.
目的。评估玻璃纤维增强复合材料（FRC）增强体位置对上颌丙烯酸树脂全口义齿比例极限弯曲载荷（FL-PL）和弯曲挠度的影响。
材料与方法。测试了有和没有 FRC 增强体的上颌丙烯酸树脂全口义齿。将聚合的 FRC 在糊剂状态下嵌入义齿基托树脂中，并将其放置在（1）嵴搭接区域下，（2）在前部区域，（3）在中部区域或（4）在前部和后部区域。测试了增强上颌义齿标本在 100-N 加载点的 FL-PL 和弯曲挠度值。
结果。所有增强义齿的 FL-PL 均高于未增强义齿，但所有义齿的 FL-PL 值彼此之间无显著差异。与未增强义齿相比，FRC 增强的效率提高了 1.54-1.75 倍。与未增强义齿相比，所有增强义齿的挠度均显著降低，但所有义齿的弯曲挠度彼此之间无显著差异。
结论。FRC 增强体的位置不影响上颌丙烯酸树脂全口义齿的抗断裂能力。与未增强义齿相比，所有增强义齿的 FL-PL 更高，弯曲挠度更低。
