Fonseca Rodrigo Borges, Kasuya Amanda Vessoni Barbosa, Favarão Isabella Negro, Naves Lucas Zago, Hoeppner Márcio Grama
Department of Restorative Dentistry and Dental Materials, Dental School, Federal University of Goiás, Praça Universitária Esquina com 1a Avenida, s/n, Setor Universitário, 74605-220 Goiânia, GO, Brazil.
Department of Dental Materials, Piracicaba Dental School, State University of Campinas, Avenue Limeira, 901 Vila Rezende, 13414-903 Piracicaba, SP, Brazil.
ScientificWorldJournal. 2015;2015:919142. doi: 10.1155/2015/919142. Epub 2015 Mar 23.
The aim of this study was to evaluate the flexural strength of acrylic resin bars by varying the types of resin polymerization and reinforcement methods. Fourteen groups (N=10) were created by the interaction of factors in study: type of resin (self-cured (SC) or heat-cured (HC)) and reinforcement method (industrialized glass fiber (Ind), unidirectional glass fiber (Uni), short glass fiber (Short), unidirectional and short glass fiber (Uni-Short), thermoplastic resin fiber (Tpl), and steel wire (SW)). Reinforced bars (25×2×2 mm) were tested in flexural strength (0.5 mm/min) and examined by scanning electron microscopy (SEM). Data (MPa) were submitted to factorial analysis, ANOVA, and Tukey and T-student tests (a=5%) showing significant interaction (P=0.008), for SC: Uni (241.71±67.77)a, Uni-Short (221.05±71.97)a, Ind (215.21±46.59)ab, SW (190.51±31.49)abc, Short (156.31±28.76)bcd, Tpl (132.51±20.21)cd, Control SC (101.47±19.79)d and for HC: Ind (268.93±105.65)a, Uni (215.14±67.60)ab, Short (198.44±95.27)abc, Uni-Short (189.56±92.27)abc, Tpl (161.32±62.51)cd, SW (106.69±28.70)cd, and Control HC (93.39±39.61)d. SEM analysis showed better fiber-resin interaction for HC. Nonimpregnated fibers, irrespective of their length, tend to improve fracture strength of acrylics.
本研究的目的是通过改变树脂聚合类型和增强方法来评估丙烯酸树脂棒的抗弯强度。通过研究中的因素相互作用创建了14组（每组n = 10）：树脂类型（自固化（SC）或热固化（HC））和增强方法（工业化玻璃纤维（Ind）、单向玻璃纤维（Uni）、短玻璃纤维（Short）、单向和短玻璃纤维（Uni-Short）、热塑性树脂纤维（Tpl）和钢丝（SW））。对增强棒（25×2×2毫米）进行抗弯强度测试（0.5毫米/分钟），并通过扫描电子显微镜（SEM）检查。数据（兆帕）进行析因分析、方差分析以及Tukey和T检验（α = 5%），结果显示存在显著交互作用（P = 0.008），对于自固化树脂：单向玻璃纤维（241.71±67.77）a、单向和短玻璃纤维（221.05±71.97）a、工业化玻璃纤维（215.21±46.59）ab、钢丝（190.51±31.49）abc、短玻璃纤维（156.31±28.76）bcd、热塑性树脂纤维（132.51±20.21）cd、自固化树脂对照组（101.47±19.79）d；对于热固化树脂：工业化玻璃纤维（268.93±105.65）a、单向玻璃纤维（215.14±67.60）ab、短玻璃纤维（198.44±95.27）abc、单向和短玻璃纤维（189.56±92.27）abc、热塑性树脂纤维（161.32±62.51）cd、钢丝（106.69±28.70）cd、热固化树脂对照组（93.39±39.61）d。扫描电子显微镜分析显示热固化树脂的纤维 - 树脂相互作用更好。无论纤维长度如何，未浸渍的纤维都倾向于提高丙烯酸树脂的断裂强度。
