Mahboub Farhang, Salehsaber Fariba, Parnia Fereydoon, Gharekhani Vahedeh, Kananizadeh Yousef, Taghizadeh Mahsa
Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2017 Summer;11(3):183-188. doi: 10.15171/joddd.2017.033. Epub 2017 Sep 20.
The aim of the present study was to evaluate the effect of Corega and 2.5% sodium hypochlorite cleansing agents on the shear and tensile bond strengths of GC soft liner to denture base. A total of 144 samples (72 samples for tensile and 72 for shear bond strength evaluations) were prepared. The samples in each group were subdivided into three subgroups in terms of the cleansing agent used (2.5% sodium hypochlorite, Corega and distilled water [control group]). All the samples were stored in distilled water, during which each sample was immersed for 15 minutes daily in sodium hypochlorite or Corega solutions. After 20 days the tensile and shear bond strengths were determined using a universal testing machine. In addition, a stereomicroscope was used to evaluate fracture modes. Data were analyzed with one-way ANOVA, using SPSS 16. The results of post hoc Tukey tests showed significant differences in the mean tensile and shear bond strength values between the sodium hypochlorite group with Corega and control groups (P=0.001 for comparison of tensile bond strengths between the sodium hypochlorite and control groups, and P<0.001 for the comparison of tensile bond strengths between the sodium hypochlorite and Corega groups and the shear bond strengths between the sodium hypochlorite and Corega groups, and sodium hypochlorite and control groups).The majority of failures were cohesive in the control and Corega groups and cohesive/adhesive in the sodium hypochlorite group. Immersion of soft liners in Corega will result in longevity of soft liners compared to immersion in sodium hypochlorite solution and sodium hypochlorite solution significantly decreased the tensile and shear bond strengths compared to the control and Corega groups.
本研究的目的是评估含氟牙膏（Corega）和2.5%次氯酸钠清洁液对GC软衬材料与义齿基托之间剪切粘结强度和拉伸粘结强度的影响。共制备了144个样本（72个用于拉伸粘结强度评估，72个用于剪切粘结强度评估）。根据所使用的清洁液（2.5%次氯酸钠、含氟牙膏和蒸馏水[对照组]），将每组样本再细分为三个亚组。所有样本均储存在蒸馏水中，在此期间，每个样本每天在次氯酸钠或含氟牙膏溶液中浸泡15分钟。20天后，使用万能试验机测定拉伸粘结强度和剪切粘结强度。此外，使用体视显微镜评估断裂模式。使用SPSS 16软件进行单因素方差分析。事后Tukey检验结果显示，次氯酸钠组与含氟牙膏组和对照组之间的平均拉伸粘结强度值和剪切粘结强度值存在显著差异（次氯酸钠组与对照组之间拉伸粘结强度比较P=0.001，次氯酸钠组与含氟牙膏组之间拉伸粘结强度比较以及次氯酸钠组与含氟牙膏组之间和次氯酸钠组与对照组之间剪切粘结强度比较P<0.001）。对照组和含氟牙膏组的大多数失败为内聚破坏，次氯酸钠组为内聚/粘结破坏。与浸泡在次氯酸钠溶液中相比，将软衬材料浸泡在含氟牙膏中可延长软衬材料的使用寿命，并且与对照组和含氟牙膏组相比，次氯酸钠溶液显著降低了拉伸粘结强度和剪切粘结强度。
