Seo Rosangela Seiko, Vergani Carlos Eduardo, Pavarina Ana Claudia, Compagnoni Marco Antonio, Machado Ana Lucia
Department of Dental Materials and Prosthodontics, Sao Paulo State University, UNESP, Araraquara Dental School, Sao Paulo, Brazil.
J Prosthet Dent. 2007 Sep;98(3):216-23. doi: 10.1016/S0022-3913(07)60058-4.
Microwave irradiation has been suggested as a method to disinfect denture bases. However, the effect of microwave heating on the dimensional stability of the relined denture bases is unknown.
The purpose of this study was to evaluate the dimensional stability of intact and relined acrylic resin denture bases after microwave disinfection.
A standard brass cast simulating an edentulous maxillary arch was machined and used to fabricate 2- and 4-mm-thick denture bases (n=200), which were processed with heat-polymerized acrylic resin (Lucitone 550). The 2-mm thick-specimens (n=160) were relined with 2 mm of autopolymerizing resin (Tokuso Rebase Fast, Ufi Gel Hard, Kooliner, or New Truliner). Distances between 5 removable pins on the standard brass cast were measured with a Nikon optical comparator, and the area (mm) formed by the distance between 5 pins was calculated and served as baseline. During fabrication, the pins were transferred to the intaglio surface of the specimens. Differences between the baseline area and those subsequently determined for the specimens were used to calculate the percent dimensional changes. The intact and relined denture bases were divided into 4 groups (n=10) and evaluated after: polymerization (control group P); 1 cycle of microwave disinfection (MW); daily microwave disinfection for 7 days (control group MW7); water storage for 7 days (WS7). Microwave irradiation was performed for 6 minutes at 650 W. Data were analyzed using 2-way ANOVA followed by Tukey's test (alpha=.05).
Intact specimens and those relined with Kooliner and New Truliner showed increased shrinkage after 1 (P=.05, .018, and .001, respectively) and 7 (P <.001, .003, and <.001, respectively) cycles of microwave disinfection. With the exception of specimens relined with Kooliner, intact specimens showed greater shrinkage than the relined specimens after 7 cycles of microwave disinfection.
Microwave disinfection produced increased shrinkage of intact specimens and those relined with New Truliner and Kooliner.
微波辐射已被提议作为一种对义齿基托进行消毒的方法。然而，微波加热对重衬义齿基托尺寸稳定性的影响尚不清楚。
本研究的目的是评估微波消毒后完整和重衬的丙烯酸树脂义齿基托的尺寸稳定性。
加工一个模拟无牙上颌弓的标准黄铜铸型，并用于制作厚度为2毫米和4毫米的义齿基托（n = 200），这些义齿基托采用热聚合丙烯酸树脂（Lucitone 550）加工而成。2毫米厚的样本（n = 160）用2毫米的自凝树脂（Tokuso Rebase Fast、Ufi Gel Hard、Kooliner或New Truliner）进行重衬。使用尼康光学比较仪测量标准黄铜铸型上5个可移动销之间 的距离，并计算由5个销之间的距离形成的面积（平方毫米），该面积作为基线。在制作过程中，将销转移到样本的组织面。用基线面积与随后为样本确定的面积之间的差异来计算尺寸变化百分比。将完整和重衬的义齿基托分为4组（n = 10），并在以下情况后进行评估：聚合后（对照组P）；1个微波消毒周期（MW）；每日微波消毒7天（对照组MW7）；在水中储存7天（WS7）。以650瓦的功率进行6分钟的微波辐射。使用双向方差分析，然后进行Tukey检验（α = 0.05）对数据进行分析。
完整样本以及用Kooliner和New Truliner重衬的样本在1次（分别为P = 0.05、0.018和0.001）和7次（分别为P < 0.001、0.003和< 0.001）微波消毒周期后收缩增加。除了用Kooliner重衬的样本外，完整样本在7次微波消毒周期后比重衬样本表现出更大的收缩。
微波消毒使完整样本以及用New Truliner和Kooliner重衬的样本收缩增加。
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