Journal of Dental Medicine

Background and Aims: Oral health affects the quality of life and plays the main role in achieving optimal conditions of health and general well-being. Therefore, this study was conducted with the aim of investigating the psychosocial effects and quality of life related to oral health in patients treated with composite veneers.
Materials and Methods: In this cross-sectional study, 48 patients who referred to the restorative department of Jundishapur University of Ahvaz for composite veneer treatment were participated. The PIDAQ questionnaire was used to investigate the aesthetic effects of composite veneer treatment on the psychosocial conditions of the patients, and the OHIP-14 questionnaire was used to investigate the quality of life related to oral health. Patients were asked to complete both questionnaires before treatment and one month after composite veneer treatment. Also, demographic information including age, sex, education and marital status of the patients were recorded. The purpose and benefits of participating in this study were fully explained to the patients and the patients voluntarily participated in this study. Then, an informed consent form was given to the patients. In order to compare the scores before and after the treatment, the paired T-test and its non-parametric equation expression (Will-Coxon) were used, and P<0.05 was considered.
Results: According to the results, the average age of the respondents was 28 years. In terms of gender, 54.2% of the patients were male, and in terms of education, most of the participants in the study had a bachelor's degree (35.4%). The total score of OHIP-14 before treatment was 26 and after treatment 22. Also, the total score of PIDAQ before treatment was 49 and after treatment 28. Comparing the scores of psychosocial effects and quality of life related to the oral health before and after composite veneer treatment showed that there was a difference between the average score of psychosocial effects and quality of life. There was a significant difference related to the oral health before and after composite veneer treatment, which significantly decreased after treatment (P<0.05).
Conclusion: The present study showed that suitable veneer composite treatments could improve the oral health related to the quality of life of people. Also, treatment with composite veneers could have a significant effect on patients' self-confidence. Composite veneers could reduce social effects, psychological effects, and cosmetic concerns related to patients’ teeth.

Background and Aims: Over the past two decades, the use of mini-screws in orthodontics has become increasingly common. Various factors such as design, length, diameter, and insertion angle of the miniscrew, as well as the quality and thickness of the patient's bone, would influence the success and stability of miniscrews. This study aimed to investigate the effects of miniscrew shape, cortical and cancellous bone thickness, and insertion/removal torque on the stress distribution in the mandibular bone surrounding the miniscrew.
Materials and Methods: This study was conducted using finite element analysis (FEA). Bone thickness parameters were extracted from the literature, and the mandibular bone along with cylindrical and tapered miniscrew models were simulated using ABAQUS software. By altering the relevant variables, the resulting stress were evaluated.
Results: An increase in both insertion and removal torque led to a corresponding rise in the stress around the miniscrew. Stress variations were more pronounced in tapared miniscrews in response to the changes in bone thickness and torque. The influence of cancellous bone thickness on stress distribution was found to be minimal.
Conclusion: Although, the tapered miniscrews offer greater retention and stability compared to the cylindrical types, their heightened sensitivity to variations in parameters such as bone thickness and torque necessitates cautious application.

Background and Aims: Musculoskeletal disorders are the most common and costly occupational injuries, and dentists are more prone to musculoskeletal problems than other medical professionals. This study aimed to investigate the effect of a course of corrective exercises on the alignment of the thoracic spine and balance in female dentists with increased kyphosis.
Materials and Methods: This research was a quasi-experimental study with a pre-test/post-test design, conducted in the field. Thirty female dentists from Amol and Babol cities (Iran) with increased kyphosis were selected using purposive sampling. The patients were randomly assigned into two groups: control (n=15) and intervention (n=15). In the pre-test, the thoracic curvature angle, static balance, and dynamic balance were assessed using a flexible ruler, the stork balance test, and the Y balance dynamic test, respectively. Then, the intervention group were assigned to perform the exercises for six weeks, while the control group only engaged in daily activities. After completing the exercises, the post-test was conducted. Paired t-tests and analysis of covariance were used to compare intra-group and inter-group differences.
Results: The statistical analysis  showed a significant difference between the two groups in the thoracic curvature angle (P=0.001), static balance (P=0.001), and dynamic balance (P=0.001). The intervention group demonstrated significant improvement in these parameters compared to the control group.

Conclusion: Based on the results of this study, it is recommended that corrective exercises under the supervision of a specialist be included in the weekly exercise program of female dentists with increased kyphosis.

Background and Aims: Achieving reliable tools for accurate shade matching of ceramic samples is of great importance in restorative and aesthetic dentistry. This study aimed to evaluate the accuracy of the Trios5 intraoral scanner in determining the shade of ceramic samples using the Vita Classical Shade Guide (VC).
Materials and Methods: This in-vitro study involved scanning each ceramic sample 15 times by two independent observers using the Trios5 intraoral scanner. The detected shade of each sample was compared with the reference shades of the Vita Classical Shade Guide (VC) and the compatibility of the scanner’s results with the reference shades was assessed. The data were analyzed using SPSS24 software and Pearson correlation and paired t-tests and kappa coefficient at a significance level of 0.05.
Results: The highest accuracy of shade detection in both observers was found for shades A2, A3, A3.5, A4, B1, and C4, each with 100% accuracy. The lowest accuracy for both observers was noted for shade A1, with 0% accuracy. The mean overall accuracy for the first and second observers was 64.99% and 63.75%, respectively, with a total overall accuracy of 64.37%. A statistically significant interobserver agreement was observed (P≤0.005).for all shades except B2 (P=0.299).
Conclusion: The Trios5 intraoral scanner can be considered a useful adjunct tool for ceramic shade determination. However, for clinical applications, it is recommended to use it in conjunction with reference tools and complementary methods such as spectrophotometry or visual assessment by experienced clinicians.