Prosthodontics Department, Faculty of Dentistry, Pror. Dr. Atatürk University, Erzurum, Turkey.
J Biomed Mater Res B Appl Biomater. 2013 Jul;101(5):878-81. doi: 10.1002/jbm.b.32892. Epub 2013 Jan 29.
The aim of this study was to evaluate of flexural strength of some adhesive resin cements. Three dual-cure composite resin cements (Nexus 3; Variolink II, Panavia F) were prepared. The manufacturer's mixing directions for the cements were followed. Adhesive resin cement was mixed, placed in the rectangular portion of the mold. Fifteen specimens were prepared for each cements. The cements were light-activated with light lamp for 40 s on both and top and bottom surfaces. The each cement specimens were divided into three groups according to time of storage and stored in distilled water for 24 h, 15, and 30 days. Total 45 specimens were stored at 37°C (98.6 0F) in distilled water for 24 h, 15, and 30 days prior to tests. The flexural strength was tested wıth a universal testing machine at a crosshead speed of 0.5 mm/min (0.02 in.) The maximum load was recorded as MPa. The results were analyzed by Analysis of Variance and Duncan test. The Panavia F resin cements content Bisphenol A was showed the highest flexural strength (80.80 MPa) (11.71 ksi) for 24 h. The lowest flexural strength was observed in Nexus 3 (51.00 MPa) (7.39 ksi). It was found significant interaction of material and time (p < 0.05). The types of cement and time of storage was statistically significant on the flexural strengths (p < 0.001).
本研究旨在评估几种黏结树脂水门汀的弯曲强度。制备了三种双固化复合树脂水门汀（Nexus 3、Variolink II、Panavia F）。按照制造商的混合说明进行水门汀的混合，将黏结树脂水门汀放置在模具的矩形部分。每种水门汀制备 15 个试件。用光灯对水门汀的上下表面进行 40 s 的光固化。根据储存时间将每种水门汀的试件分为三组，分别在蒸馏水中储存 24 h、15 d 和 30 d。总共有 45 个试件在 37°C（98.6°F）的蒸馏水中储存 24 h、15 d 和 30 d 后进行测试。使用万能试验机以 0.5 mm/min（0.02 in/min）的十字头速度进行弯曲强度测试。记录最大载荷作为 MPa。采用方差分析和 Duncan 检验对结果进行分析。Bis-phenol A 含量最高的 Panavia F 树脂水门汀在 24 h 时表现出最高的弯曲强度（80.80 MPa）（11.71 ksi）。Nexus 3 的弯曲强度最低（51.00 MPa）（7.39 ksi）。材料和时间之间存在显著的交互作用（p<0.05）。水门汀类型和储存时间对弯曲强度有统计学意义（p<0.001）。
