Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University - UNESP, São Paulo, Brazil.
Gerodontology. 2010 Mar;27(1):62-9. doi: 10.1111/j.1741-2358.2009.00292.x. Epub 2009 Mar 31.
In this study, the effect of relining and surface treatment on the impact strength (IS) of a heat-polymerising denture base acrylic resin (Lucitone 550-L) was evaluated.
Rectangular bars of L were made (60 x 6 x 2 mm) and relined (2 mm) with the relining resins Ufi Gel Hard (UH) and Tokuso Rebase Fast (TR). Specimens relined with L and intact L, TR and UH specimens were also made (60 x 6 x 4 mm), for comparison. Before relining, the L surface was left untreated or wetted with methyl methacrylate monomer and/or the bonding agents (BA) supplied by manufacturers of the reline resins. V-notches were machined at the midpoint of the length of all specimens. The notches were made either across the width (Nw) or across the thickness of the specimens (Nth). The Charpy impact test was performed using a 0.5-J pendulum, which had been specially designed and constructed. Data were analysed separately for each notch position using one-way analysis of variance and Tukey honestly significant difference post-hoc test (p = 0.05).
The IS of L was similar to that of L/L. For the Nw notch, treating the denture base L with TR BA and relining with TR reline material produced the highest IS.
The IS of specimens made from heat polymerising acrylic resin Lucitone 550 was increased after relining using the hard chairside reline resin TR with its proprietary BA.
本研究评估了衬里和表面处理对热聚合义齿基托树脂(Lucitone 550-L)冲击强度(IS)的影响。
制作了 L 的矩形棒(60 x 6 x 2 毫米)并用衬里树脂 Ufi Gel Hard(UH)和 Tokuso Rebase Fast(TR)进行衬里(2 毫米)。还制作了衬里 L 和完整 L、TR 和 UH 标本(60 x 6 x 4 毫米)进行比较。衬里前,L 表面未经处理或用甲基丙烯酸甲酯单体和/或衬里树脂制造商提供的粘结剂(BA)润湿。在所有标本的长度中点处加工 V 型缺口。缺口可以穿过宽度(Nw)或穿过标本的厚度(Nth)制成。使用专门设计和制造的 0.5-J 摆锤进行夏比冲击试验。使用单向方差分析和 Tukey 诚实显著差异事后检验(p = 0.05)分别对每个缺口位置的数据进行分析。
L 的 IS 与 L/L 相似。对于 Nw 缺口,用 TR BA 处理义齿基托 L 并用 TR 衬里材料衬里可获得最高的 IS。
使用具有专有 BA 的硬椅旁衬里树脂 TR 进行衬里后,Lucitone 550 热聚合丙烯酸树脂制成的标本的 IS 增加。