Rao C Satyanageshwar, Reddy S Sreedhar, Prasad G Maruthi, Reddy K Srinivas, Rao N Venugopal, Naik Madhukeshwara S
Department of Prosthodontics, Hitech Dental College and Hospital, Bhubaneshwar, Odisha, India.
J Contemp Dent Pract. 2012 May 1;13(3):394-400. doi: 10.5005/jp-journals-10024-1157.
To evaluate and compare the shear bond strength of resilient liners with heat cure denture base resins in the presence or absence of saliva.
Two commercially available heat polymerized acrylics and three commercially available denture liners were immersed in artificial saliva for 7 days and 14 days, respectively. A total of 180 (Acralyn-H, No.90 and Lucitone - 199, No.90) specimens were prepared. Total of 90 overlapping joint specimens were prepared, 45 of them using Acralyn H (AGroup) and rest 45 using Lucitone-199 (L-Group). The specimens were tested for flexural strength with a 3-point bending test on an Instron universal testing machine. The results were analyzed with a one-way analysis of variance (ANOVA).
The mean difference in shear bond strength (SBS) at different time intervals was found to be statistically significant (p < 0.001). Lucitone-199 recorded a significantly higher mean SBS compared to Acralyn H (p < 0.001). Further, significant differences between GC and Densply, GC and Aswin liners, and between Dentsply and Aswin were noted (p < 0.001). Difference between baseline and 7 days time interval, as well as, between baseline and 14 days time interval with respect to the mean SBS of these materials were significant (p < 0.001). Also, the mean difference in SBS between 7 days time interval and 14 days time interval was statistically significant (p < 0.001). Among the three different liners, GC yielded a higher mean SBS compared to Aswin and Dentsply at all the three time intervals. The mean SBS recorded in Dentsply and Aswin was almost same at 14 days time interval, but at baseline and 7 days, it was higher in Aswin compared to Dentsply.
Lucitone-199 recorded a higher mean SBS compared to Acralyn H. As the time interval increases, the mean SBS recorded in both the denture base materials decrease. Among the three different liners, GC yields a higher mean SBS compared to Aswin and Dentsply at all the three time intervals.
The most common reason for failures of resilient linings in removable dentures is the separation of these linings from the denture base. Therefore, poor adhesive bond properties are one of the serious defects of the material in clinical practice.
评估并比较在有或无唾液存在的情况下，弹性衬垫与热凝义齿基托树脂之间的剪切粘结强度。
两种市售热聚合丙烯酸树脂和三种市售义齿衬垫分别浸泡在人工唾液中7天和14天。共制备了180个样本（Acralyn - H，编号90；Lucitone - 199，编号90）。总共制备了90个重叠关节样本，其中45个使用Acralyn H（A组），其余45个使用Lucitone - 199（L组）。在Instron万能试验机上通过三点弯曲试验对样本进行弯曲强度测试。结果采用单因素方差分析（ANOVA）进行分析。
发现在不同时间间隔下剪切粘结强度（SBS）的平均差异具有统计学意义（p < 0.001）。与Acralyn H相比，Lucitone - 199记录的平均SBS显著更高（p < 0.001）。此外，还注意到GC与Densply、GC与Aswin衬垫之间以及Dentsply与Aswin之间存在显著差异（p < 0.001）。这些材料在基线与7天时间间隔之间以及基线与14天时间间隔之间，就平均SBS而言差异显著（p < 0.001）。而且，7天时间间隔与14天时间间隔之间SBS的平均差异具有统计学意义（p < 0.001）。在这三种不同衬垫中，在所有三个时间间隔下，GC产生的平均SBS均高于Aswin和Dentsply。在14天时间间隔时，Dentsply和Aswin记录的平均SBS几乎相同，但在基线和7天时，Aswin的平均SBS高于Dentsply。
与Acralyn H相比，Lucitone - 199记录的平均SBS更高。随着时间间隔增加，两种义齿基托材料记录的平均SBS均降低。在这三种不同衬垫中，在所有三个时间间隔下，GC产生的平均SBS均高于Aswin和Dentsply。
可摘局部义齿中弹性衬垫失败的最常见原因是这些衬垫与义齿基托分离。因此，粘结性能差是该材料在临床实践中的严重缺陷之一。
