Behr M, Rosentritt M, Latzel D, Handel G
Department of Prosthodontics, University of Regensburg, 93042 Regensburg, Germany.
Clin Oral Investig. 2003 Sep;7(3):135-9. doi: 10.1007/s00784-003-0211-x. Epub 2003 Jun 19.
This study compared fracture resistance of fiber-reinforced and non-fiber-reinforced composite molar crowns under simulated oral stress conditions. Three groups of fiber-reinforced composite crowns were constructed using one polyethylene fiber (belleGlass/Connect) and two glass fiber reinforcement systems (Sculpture/FiberKor, Targis/Vectris). The non-fiber-reinforced crowns based on the facing material alone: Sculpture, Targis or belleGlass. Additionally, crowns were made of the non-reinforced composite Artglass. Each group consisted of eight crowns. All crowns were luted to human molars and exposed to thermal cycling and mechanical loading (6000 x 5 degrees C/55 degrees C; 1.2 x 10(6x)50 N; 1.66 Hz). The fracture resistance was measured using a Zwick universal testing machine.
The non-reinforced Artglass crowns demonstrated the highest fracture resistance, significantly higher than the resistance shown with belleGlass, belleGlass/Connect or Targis. Artglass showed an extremely wide distribution of values, however. No statistically significant differences were found between the reinforced and non-reinforced composite crowns of Vectris/Targis, FiberKor/Sculpture or Connect/belleGlass although the reinforced crowns showed a tendency towards higher values. The fracture resistance values scattered markedly more for the reinforced crowns, and their lowest fracture values also reached the level of the lowest non-reinforced crowns. The small distribution of fracture values for the non-reinforced crowns indicates that they will be less susceptible for manufacturing faults and more reliable under clinical conditions.
RESULTS of this study suggest that single molar composite crowns (tested in this study) do not benefit from fiber-reinforcement.
本研究比较了在模拟口腔应力条件下纤维增强和非纤维增强复合磨牙冠的抗折性。使用一种聚乙烯纤维（belleGlass/Connect）和两种玻璃纤维增强系统（Sculpture/FiberKor、Targis/Vectris）构建了三组纤维增强复合冠。非纤维增强冠仅基于饰面材料：Sculpture、Targis或belleGlass。此外，冠由非增强复合材料Artglass制成。每组由八个冠组成。所有冠都粘结到人类磨牙上，并进行热循环和机械加载（6000次×5℃/55℃；1.2×10⁶次×50N；1.66Hz）。使用Zwick万能试验机测量抗折性。
未增强的Artglass冠表现出最高的抗折性，显著高于belleGlass、belleGlass/Connect或Targis的抗折性。然而，Artglass的值分布极广。Vectris/Targis、FiberKor/Sculpture或Connect/belleGlass的增强和未增强复合冠之间未发现统计学上的显著差异，尽管增强冠有更高值的趋势。增强冠的抗折性值分散明显更多，其最低抗折值也达到了最低未增强冠的水平。未增强冠的抗折值分布范围小表明它们对制造缺陷的敏感性较低，在临床条件下更可靠。
本研究结果表明，单颗磨牙复合冠（本研究中测试的）未从纤维增强中获益。
