Kostoulas Ioannis, Kavoura Victoria T, Frangou Mary J, Polyzois Gregory L
Section of Removable Prosthodontics, Department of Prosthodontics, Dental School, University of Athens, Athens, Greece.
J Prosthodont. 2008 Jun;17(4):257-61. doi: 10.1111/j.1532-849X.2007.00276.x. Epub 2007 Dec 17.
Fractures in acrylic resin dentures occur quite often in the practice of prosthodontics. A durable repairing system for denture base fracture is desired to avoid recurrent fracture. The purpose of this study was to evaluate the fracture force, deflection, and toughness of a heat-polymerized denture base resin repaired with autopolymerized resin alone (C), visible light-polymerizing resin (VLC), or autopolymerizing resin reinforced with unidirectional (Stick) (MA-FS) and woven glass fibers (StickNet) (MA-SN). Another group was repaired with autopolymerized resin after wetting the repair site with methyl methacrylate (MA-MMA) for 180 seconds. A group of intact specimens was used as control.
Heat-polymerizing acrylic resin was used to fabricate the specimens. The specimens (10 per group) were sectioned in half, reassembled with a 3-mm butt-joint gap, and repaired. A cavity was included when glass fibers were used. Three-point bending was used to test the repaired site, and data were analyzed with one-way ANOVA and the Tukey's post hoc test (alpha < or = 0.05).
Fracture force, deflection, and toughness for the repaired groups without reinforcement (MA: 46.7 +/- 8.6 N, 2.6 +/- 0.3 mm, 0.08 +/- 0.001 J; MA-MMA: 41.0 +/- 7.2 N, 2.7 +/- 0.4 mm, 0.07 +/- 0.002 J) were significantly lower (p < 0.05) than the control group (C: 78.6 +/- 9.6 N, 5.9 +/- 0.4 mm, 0.27 +/- 0.003 J). Repair with visible light-polymerizing resin (VLC, 15.0 +/- 4.0 N, 1.2 +/- 0.4 mm, 0.02 +/- 0.0001 J) resulted in significant reduction of mechanical properties (p < 0.05). Reinforcement with glass fibers restored (MA-SN: 75.8 +/- 9.2 N) or increased (MA-FS: 124.4 +/- 12.5 N) the original strength.
The most effective repair method was the use of autopolymerized resin reinforced with unidirectional glass fibers.
在口腔修复实践中，丙烯酸树脂假牙经常出现骨折情况。需要一种耐用的假牙基托骨折修复系统来避免反复骨折。本研究的目的是评估仅用自凝树脂（C组）、可见光固化树脂（VLC组）、单向玻璃纤维增强的自凝树脂（Stick组，MA-FS组）和编织玻璃纤维增强的自凝树脂（StickNet组，MA-SN组）修复的热聚合假牙基托树脂的断裂力、挠度和韧性。另一组在用甲基丙烯酸甲酯（MA-MMA）湿润修复部位180秒后用自凝树脂修复。一组完整的标本用作对照。
使用热聚合丙烯酸树脂制作标本。将标本（每组10个）切成两半，以3毫米对接间隙重新组装并修复。使用玻璃纤维时包括一个腔。采用三点弯曲试验修复部位，数据采用单因素方差分析和Tukey事后检验（α≤0.05）进行分析。
未增强修复组（MA组：46.7±8.6 N，2.6±0.3 mm，0.08±0.001 J；MA-MMA组：41.0±7.2 N，2.7±0.4 mm，0.07±0.002 J）的断裂力、挠度和韧性显著低于对照组（C组：78.6±9.6 N，5.9±0.4 mm，0.27±0.003 J）（p<0.05）。用可见光固化树脂修复（VLC组，15.0±4.0 N，1.2±0.4 mm，0.02±0.0001 J）导致机械性能显著降低（p<0.05）。玻璃纤维增强恢复（MA-SN组：75.8±9.2 N）或提高（MA-FS组：124.4±12.5 N）了原始强度。
最有效的修复方法是使用单向玻璃纤维增强的自凝树脂。
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