Ahmad Fauziah, Dent McLin, Yunus Norsiah
Department of Prosthetic Dentistry, University of Malaya, Kuala Lumpur, Malaysia.
J Prosthodont. 2009 Oct;18(7):596-602. doi: 10.1111/j.1532-849X.2009.00481.x. Epub 2009 Jun 8.
This study evaluated the shear bond strengths of light-polymerized urethane dimethacrylate (Eclipse) and heat-polymerized polymethylmethacrylate (Meliodent) denture base polymers to intraoral and laboratory-processed reline materials.
Thirty disks measuring 15 mm diameter and 2 mm thick were prepared for each denture base material following the manufacturers' recommendation. They were relined with Meliodent RR, Kooliner, and Secure reline materials after 1 month of water immersion. Ten additional Eclipse specimens were relined using the same Eclipse resin. A shear bond test was carried out on an Instron machine at a crosshead speed of 1.0 mm/min 24 hours after relining. Data were analyzed using two-way and one-way ANOVAs and post hoc Dunnett's T3 test (p= 0.05). The nature of failure was analyzed under a stereomicroscope. The effect of dichloromethane adhesive on the two denture polymer surfaces and the failed interfaces of mixed and adhesive failures were analyzed under a SEM (scanning electron microscope).
Two-way ANOVA showed significant differences in the shear bond strength values as a function of the denture base polymers, reline materials, and their interaction (p < 0.05). One-way ANOVA showed significant differences in shear bond strength values among denture base-reline combinations (p < 0.05) except for Meliodent-Kooliner and Eclipse-Meliodent RR relines. Meliodent showed the highest shear bond strength value when relined with Meliodent RR (14.5 +/- 0.5 MPa), and Eclipse showed the highest value with Eclipse relining (11.4 +/- 0.6 MPa). Meliodent denture base showed adhesive, cohesive, and mixed failure, while all Eclipse showed adhesive failure with various reline materials.
The two chemically different denture base polymers showed different shear bond strength values to corresponding reline materials.
本研究评估了光固化聚氨酯二甲基丙烯酸酯（Eclipse）和热固化聚甲基丙烯酸甲酯（Meliodent）义齿基托聚合物与口腔内及实验室加工的重衬材料之间的剪切粘结强度。
按照制造商的建议，为每种义齿基托材料制备30个直径15 mm、厚2 mm的圆盘。在水浸1个月后，用Meliodent RR、Kooliner和Secure重衬材料对其进行重衬。另外10个Eclipse标本用相同的Eclipse树脂进行重衬。重衬24小时后，在Instron机器上以1.0 mm/min的十字头速度进行剪切粘结试验。使用双向和单向方差分析以及事后Dunnett's T3检验（p = 0.05）对数据进行分析。在立体显微镜下分析失败的性质。在扫描电子显微镜下分析二氯甲烷粘合剂对两种义齿聚合物表面以及混合和粘合剂失败的失败界面的影响。
双向方差分析显示，作为义齿基托聚合物、重衬材料及其相互作用的函数，剪切粘结强度值存在显著差异（p < 0.05）。单向方差分析显示，除Meliodent-Kooliner和Eclipse-Meliodent RR重衬外，义齿基托-重衬组合之间的剪切粘结强度值存在显著差异（p < 0.05）。当用Meliodent RR重衬时，Meliodent显示出最高的剪切粘结强度值（14.5 +/- 0.5 MPa），而当用Eclipse重衬时，Eclipse显示出最高的值（11.4 +/- 0.6 MPa）。Meliodent义齿基托显示出粘合剂、内聚和混合失败，而所有Eclipse与各种重衬材料均显示出粘合剂失败。
两种化学性质不同的义齿基托聚合物对相应的重衬材料显示出不同的剪切粘结强度值。
