Yoshida Kaneyoshi, Takahashi Yutaka, Sasaki Hirono, Hamanaka Ippei, Kawaguchi Tomohiro
Division of Removable Prosthodontics, Fukuoka Dental CollegeFukuokaJapan.
Acta Biomater Odontol Scand. 2016 Jan 26;2(1):20-24. doi: 10.3109/23337931.2015.1135745. eCollection 2016 Dec.
This study evaluated the flexural strengths of reinforced denture base resins subjected to long-term water immersion. Acrylic denture base resin reinforced with metal wire or glass fiber-reinforced composite (FRC), and without reinforcement were tested. Bar-shaped specimens were fabricated. Half of the specimens were stored in 37 °C distilled water for 50 hours (h), the other half were stored in 37 °C distilled water for 180 days (d) before testing. Ten specimens were fabricated per group for each reinforcement/water immersion period combination. The ultimate flexural strength and flexural strength at the proportional limit of reinforced denture base resin were tested. The 180 d bulk specimen possessed significantly lower ultimate flexural strength compared with the 50 h bulk specimen ( < 0.05). The ultimate flexural strength of the 50 h metal, 50 h FRC, 180 d metal and the 180 d FRC reinforcement specimens were not significantly different from each other ( > 0.05). The 180 d bulk specimen had a significantly lower flexural strength at the proportional limit compared to the 50 h bulk specimen. The 180 d reinforced specimens of metal and FRC were not significantly different from each of the 50 h specimens. The flexural strengths of a reinforced denture base resin did not change after long-term water immersion.
本研究评估了长期水浸后增强义齿基托树脂的弯曲强度。测试了用金属丝增强的丙烯酸义齿基托树脂、玻璃纤维增强复合材料（FRC）增强的丙烯酸义齿基托树脂以及未增强的丙烯酸义齿基托树脂。制作了条形试件。在测试前，一半试件在37℃蒸馏水中储存50小时（h），另一半试件在37℃蒸馏水中储存180天（d）。对于每种增强/水浸时间组合，每组制作10个试件。测试了增强义齿基托树脂的极限弯曲强度和比例极限弯曲强度。与50小时的整体试件相比，180天的整体试件的极限弯曲强度显著更低（<0.05）。50小时金属增强、50小时FRC增强、180天金属增强和180天FRC增强试件的极限弯曲强度彼此之间无显著差异（>0.05）。与50小时的整体试件相比，180天的整体试件在比例极限下的弯曲强度显著更低。180天金属增强和FRC增强试件与50小时的各试件相比无显著差异。长期水浸后，增强义齿基托树脂的弯曲强度没有变化。
