Does Addition of Silver Nanoparticles to Denture Base Resin Increase Its Thermal Conductivity?

Objective: Studies have demonstrates that physical properties of denture base affect patient satisfaction and acceptance. Thermal conductivity is among the most important properties of denture base influencing the sense of taste and gingival health. The conventionally used acrylic resin has a low coefficient of thermal conductivity. This study aimed to improve the thermal conductivity of acrylic resin by adding small concentrations of nanosilver.Methods: In this laboratory experimental study, 0.2wt% and 2wt% silver nanoparticles measuring 10-100 nm were mixed with the conventional denture base acrylic powder. Cylindrical samples were fabricated and thermal conductivity was measured. One-way ANOVA and Scheffe’s post-hoc test were used to compare the mean thermal conductivity of different groups. Data were analyzed using SPSS 15 and p<0.05 was considered statistically significant.Results: The thermal conductivity of resins reinforced with nanosilver was significantly higher than that of the conventional resin. By increasing the amount of nanoparticles in the acrylic powder, thermal conductivity further increased.Conclusion: Addition of small amounts of nanosilver to denture base acrylic resin increases its thermal conductivity

The Effectiveness of the Marriage Enrichment Program Based on the Cognitive-Behavioral Approach on the Marital Intimacy of Addicted Man and their Wives

Objective: The aim of this study is to investigate the effectiveness of the marriage enrichment program based on the cognitive-behavioral approach on marital intimacy of addicted individuals and their wives. Method: The experimental and control group of this research was totally composed of 20 couples. A pre-test post-test research model with control group was been used in this research. Marital intimacy Scale as being pre-test and post-test was applied to the experimental and control groups. In order to test that, meaningful differences between the scores of pre-test and post-test within both control and experimental group covariance analysis test were used. Findings: It was found that this marriage enrichment program had positive effects on some levels of marital intimacy. The results indicate that the difference between the scores of post-test of the experimental and control groups is significant. Conclusion: The findings have been discussed in the light of literature, and some suggestions have been made. The marriage enrichment program could be used to enhancement marriage intimacy

The Effectiveness of Teaching Close-Reading Strategies on Comprehension and Test Anxiety among students

In this study, has been studied the effectiveness of close-reading strategies training on comprehension and test anxiety of students. The method of this research was the experimental design, using a pre and post-test exam with the control group. The statistical population of the study were female students of 8th grade of district 5 Tehran city in 1395-96, and selected by cluster sampling method and randomly selected in 2 experiment groups & 2 control groups (a total of 4 groups). In the pre and post-test, subjects evaluated using the researcher - made test, comprehension and Friedban anxiety Questionnaire (1997). Experimental groups taught to training basic techniques of close reading during 8 sessions. During this period, the control groups did not receive this training. The results were analyzed using Covariance analysis showed as a result of close reading training there is a significant difference in the comprehension and anxiety of the test in the experimental groups than control groups in pre and post-test (p<0.05). Therefore, close-reading strategies training can increase comprehension scores and have a reduction effect on students ' anxiety test. Due to its usefulness, it can used as a study method in schools