Journal of Dental Medicine

Background and Aims: In response to esthetic demand and use of zirconia abutments; detection of implant-abutment connection misfit is so important. The purpose of this study was to evaluate the sensitivity and specificity of radiographic images in the detection of abutment-implant connection misfit in zirconia and titanium abutments of three different implant connections.

Materials and Methods: One regular implant fixture of Branemark, Noble active and Replace systems were mount in acrylic models. Two pieces titanium and zirconium abutments were attached to the implants, once with correct adaptation and once with 0.5 mm spacer. Digital radiographic images were taken of 12 created states with zero degree vertical and horizontal inclination and evaluated by 10 specialists in implant treatment in two different time penods. Data were analyzed using Kappa analysis.

Results: Interclass Correlation Coefficients (ICC) of the agreement of answers in the first and second times were 97.4 and 97.5, respectively (P<0/001). Sensitivity of detecting gap in all groups was acceptable (95-100%) except titanium abutment in Noble active which was the lowest value (35%). Specificity of all groups were acceptable (80-95%) except zirconia abutments in Noble active and Replace with 45% and 30% values, respectively, and titanium abutments in Branemark had the highest value (95%).

Conclusion: The sensitivity of radiographic images in detection of abutment-implant connection misfit only in Noble active with titanium abutment was not acceptable. Specificity of radiographic images in the absence of gap in titanium abutments was more favorable.

Background and Aims: Cancer is the 3rd cause of death after heart disease and injuries in Iran. Radiotherapy and chemotherapy are the most effective procedures in cancer therapy, but their side effects are still unknown for many patients. The main goal of this study was to evaluate the patients’ knowledge with head and neck cancer regarding the complications of radiotherapy and chemotherapy.
Materials and Methods: This descriptive-analytical research was based on the information extracted from personal questionnaires and files of cancer patients who referred to the centers of Kerman University of Medical Sciences during a 6 months period in 2017. The data were analyzed by chi-square test at the significance level of 0.05.
Results: Our findings showed that most of the patients (76.48%) had low information level. There was no statistically significant association between the knowledge with demographic variables (P>0.05). However, patients with chronic disease had higher level of information. Only 10% of patients had received information by their physicians.
Conclusion: It seems there is not effective education regarding the rated radiotherapy and chemotherapy complications, because their knowledge was not in acceptable level. Considering the importance of this issue, it is necessary to perform educational program to improve patients' ability and skills to cope whit the chemotherapy and radiotherapy complications and their side effects.

Background and aims: Solubility is an important property of luting cements in determining clinical durability. The aim of this study was to compare the solubility of Panavia, Calibra and Maxcem resin cements with that of GC Fuji PLUS resin modified glass ionomer cement in three different pH values.
Materials and Methods: A total of 96 specimens were prepared (8mm diameter, 4mm thickness) according to manufacturer instructions. After setting, they were desiccated and weighed. The specimens were kept immersed in distilled water and lactic acid solution (pH values of 3 and 5) for 30 days and then removed and weighed again. Data were statistically analyzed by SPSS18 using two-way ANOVA with P≤0.05 set as the level of significance.
Results: The results of this study showed no significant difference between three pH values (P=0.08). The Calibra resin cement had the lowest value of solubility in distilled water and both pH of lactic acid. GC Fuji PLUS resin modified glass ionomer cement had the highest value of solubility in lactic acid and the Maxcem resin cement had the highest value of solubility in water.
Conclusion: The solubility characteristics of resin modified glass ionomer and three different resin cements were significantly affected by their composition and the storage condition.

Background and Aims: Nowadays, the requirement of any policy-making at the national and regional level is to know the level of knowledge of people about oral health and ways to prevent dental caries.  This study examined the habits, actions and economic level of elementary school students in Qazvin city in 2017-2018.  Also, the effects of peer group social network on behaviors related to oral health and obesity was investigated in order to find the way for interventions making it more effective in this social group. Materials and Methods: In this descriptive-analytical study, 145 students participated. They were in the 3nd and 6th grades of elementary school in the academic year of 2017-2018. The questionnaire used in this study had 20 questions and 4 main sections. The main parts of this questionnaire included demographic characteristics, behavior and habits related to oral health, oral health knowledge of students and families, and socio-economic status. Data were collected through clinical examinations and through valid questionnaires and evaluated using SPSS and Excel software. Results: According to the results of Pearson's correlation analysis, a significant correlation was observed between the health knowledge scores of individuals and their friends between both groups of casual and close friends (P<0.01). The correlation between the knowledge of individuals and close friends was significantly stronger (P<0.01). Also, there was a significant relationship between socio-economic status and behaviors related to oral health (P<0.05). There was also a significant positive relationship between the number of times close friends brushing their teeth in a social network (P<0.001). This connection was not observed in the friends’ network. Conclusion: This study determined that close friends can be effective in determining the oral hygiene behaviors of elementary school students.