Machado Ana Lucia, Breeding Larry C, Puckett Aaron D
Araraquara Dental School, Sao Paulo University, Sao Paulo, Brazil.
J Prosthet Dent. 2005 Aug;94(2):183-9. doi: 10.1016/j.prosdent.2005.04.017.
Microwave irradiation has been suggested for denture disinfection. However, the effect of this procedure on the hardness and bond strength between resilient liners and denture base acrylic resin is not known.
This study evaluated the effect of water storage time and microwave disinfection on the hardness and peel bond strength of 2 silicone resilient lining materials to a heat-polymerized acrylic resin.
Acrylic resin (Lucitone 199) specimens (75 x 10 x 3 mm) were stored in water at 37 degrees C (2 or 30 days) before bonding (n = 160). The resilient lining materials (GC Reline Extra Soft and Dentusil) were bonded to the denture base and divided into the following 4 groups (n = 10): Tests performed immediately after bonding (control); specimens immersed in water (200 mL) and irradiated twice, with 650 W for 6 minutes; specimens irradiated daily for 7 total cycles of disinfection; specimens immersed in water (37 degrees C) for 7 days. Specimens were submitted to a 180-degree peel test (at a crosshead speed of 10 mm/min) and the failure values (MPa) and mode of failure were recorded. Pretreatment and posttreatment hardness measurements (Shore A) of the resilient materials were also performed. Three-way analysis of variance, followed by the Tukey HSD test, was performed (alpha = .05).
The analysis revealed that, for all conditions, the mean failure strengths of GC Reline Extra Soft (0.95-1.19 MPa) were significantly higher ( P < .001) than those of Dentusil (0.45-0.50 MPa). The adhesion of the liners was not adversely affected by water storage time of Lucitone 199 or microwave disinfection. All peel test failures were cohesive. There was a small but significant difference ( P < .001) between the pretreatment (34.33 Shore A) and posttreatment (38.69 Shore A) hardness measurements.
Microwave disinfection did not compromise the hardness of either resilient liners or their adhesion to the denture base resin Lucitone 199.
有人提出用微波辐射进行义齿消毒。然而，该方法对弹性衬垫与义齿基托丙烯酸树脂之间的硬度和粘结强度的影响尚不清楚。
本研究评估了储水时间和微波消毒对两种硅酮弹性衬垫材料与热聚合丙烯酸树脂之间的硬度和剥离粘结强度的影响。
丙烯酸树脂（Lucitone 199）试件（75×10×3mm）在粘结前于37℃水中储存（2天或30天）（n = 160）。将弹性衬垫材料（GC Reline Extra Soft和Dentusil）粘结到义齿基托上，并分为以下4组（n = 10）：粘结后立即进行测试（对照组）；将试件浸入水中（200mL）并进行两次辐射，功率650W，每次6分钟；试件每天进行辐射，共进行7次消毒循环；试件在37℃水中浸泡7天。对试件进行180度剥离试验（十字头速度为10mm/min），记录破坏值（MPa）和破坏模式。还对弹性材料进行了预处理和后处理硬度测量（邵氏A）。进行了三因素方差分析，随后进行Tukey HSD检验（α = 0.05）。
分析表明，在所有条件下，GC Reline Extra Soft的平均破坏强度（0.95 - 1.19MPa）均显著高于Dentusil（0.45 - 0.50MPa）（P < 0.001）。Lucitone 199的储水时间或微波消毒对衬垫的粘结没有不利影响。所有剥离试验的破坏均为内聚破坏。预处理硬度（邵氏A 34.33）和后处理硬度（邵氏A 38.69）测量之间存在微小但显著的差异（P < 0.001）。
微波消毒不会损害弹性衬垫的硬度或其与义齿基托树脂Lucitone 199的粘结。
