Background: Although the prevalence of complete edentulism has decreased over the past decade, there are significant regional differences. For example, among adults aged 15 and older in the United States, the prevalence of complete edentulism is 4.9%, while in China, approximately one in four elderly individuals is completely edentulous. The primary treatment for this condition is complete dentures. Over the past ten years, the use of digital technology for fabricating complete dentures has increased substantially, prompting comparative studies between conventionally fabricated and digitally fabricated complete dentures. Aim: To compare the initial fit of complete maxillary dentures fabricated using digital and conventional methods, and to evaluate the dimensional changes after one month of denture use. Materials and Methods: This study was conducted based on the decision No. 24-25/05-02 of the Research Ethics Committee of the Mongolian National University of Medical Sciences. The study was carried out at the School of Dentistry, specifically in the Department of Prosthodontics and the Digital Technology Laboratory. A total of 30 complete dentures-15 fabricated digitally and 15 fabricated using conventional methods-were made for 15 patients with complete edentulism. Each denture was used for a period of one month, after which denture retention was re-evaluated using a force gauge (AMF500). Statistical analysis was performed using SPSS version 26.0, and differences were considered significant at p<0.05. Result: To compare the differences between digital and conventional methods at baseline, the Wilcoxon Signed-Rank Test was performed. The results showed a statistically significant difference (Z=-2.045, p=0.041, p<0.05). At the one-month follow-up, the Friedman test revealed a significant difference among the four groups (χ²(3)=11.40, p=0.01). Pairwise comparisons using the Wilcoxon Signed-Rank Test indicated that retention of conventional complete dentures at one month was significantly different (Z=-2.803, p=0.005), and retention of CAD/CAM-fabricated complete dentures at one month was also significantly different (Z=-2.497, p=0.013). However, comparison of baseline and one-month retention between CAD/CAM and conventional dentures showed no statistically significant difference (p=0.059). Conclusion At baseline, retention of conventional complete dentures was statistically higher compared to CAD/CAM-fabricated dentures. At the one-month follow-up, retention improved for both conventional and digital dentures.

Background: In the field of oral and maxillofacial prosthetics, implant-supported or tooth-supported prostheses have been proven to be an effective treatment option for patients with partial edentulism. However, complete dentures remain the sole treatment option for fully edentulous patients. Over the past decade, the use of CAD/CAM technology for fabricating complete dentures has increased substantially, leading to a growing number of studies comparing conventional complete dentures with those produced using CAD/CAM. In our country, however, there is a scarcity of research comparing the retention of maxillary complete dentures fabricated by conventional and CAD/CAM methods. Aim: To compare the retention of maxillary complete dentures fabricated by CAD/CAM and conventional methods. Materials and Methods: This study was conducted using a clinical trial design. The research was carried out at the Department of Prosthodontics, School of Dentistry, Mongolian National University of Medical Sciences (MNUMS), utilizing the Digital Technology Laboratory. The retention of 15 maxillary complete dentures fabricated by CAD/CAM and conventional methods was measured using a force gauge (AMF500). Statistical analysis was performed using SPSS version 26.0, and differences were considered statistically significant at p<0.05. Result: The mean retention of maxillary complete dentures fabricated by the conventional method (8.85±9.10N) was higher than that of dentures fabricated by the CAD/CAM method (4.95±2.57N). To assess the difference between the two fabrication methods, the Wilcoxon Signed Ranks Test was performed. The results showed Z=-2.045, p=0.041 (p<0.05), indicating that the retention of conventional dentures was statistically significantly higher than that of CAD/CAM dentures. Conclusion The retention of maxillary complete dentures fabricated by the conventional method was statistically significantly higher than that of dentures fabricated by the CAD/CAM method.

Background: Mastication is a biomechanical process that involves the jaws and teeth working together to effectively break down food through the contraction of masticatory muscles. The efficiency of this process is influenced by factors such as bite force, the integrity of the dental arch, and individual characteristics, including age, gender, and body weight. Previous research has investigated the bite force of natural teeth, comparing the differences between removable and fixed denture teeth. For instance, Gibbs et al. estimated the bite force of Eskimo individuals to be 348 lbs (138 kg), while Al-Zarea et al. reported a bite force of 580.9 N for fixed partial dentures. Additionally, J. Urangua estimated the bite force of first permanent molars to be 472 N. Although studies have explored the bite force of Mongolian individuals with removable dentures, there has been no investigation into the bite force of fixed partial dentures, highlighting a significant gap in the literature that the current study aims to address. Aim: This study aims to assess the bite force following the restoration of teeth with Zirconia and Porcelain-Fused-to-Metal crowns. Materials and Methods: The study involved 20 individuals aged 18 to 34 years, each of whom had their mandibular molars restored with Zirconia and Porcelain-Fused-to-Metal (PFM) crowns on one side, while the other side retained their natural teeth, which had not undergone root canal treatment and exhibited no significant alveolar bone loss. A single-instance design was employed to measure occlusal force using the Occlusal Force Meter GM10. Statistical analysis was conducted using SPSS 26.0 software, with results considered statistically significant at a probability level of p < 0.05. Results: The cohort comprised 20 subjects aged 18 to 34 years, with 65% (13) male and 35% (7) female, yielding a mean age of 28.2 ± 3.5 years. The mean bite force for teeth covered with crowns was (393.2±0.3 N), compared to (445.5±70 N) for natural teeth. Notably, the bite force of the Zirconia crown (407.0±0.7 N) was higher than that of the Porcelain-Fused-to-Metal (PFM) crown 367.7±0.9N. When analyzed by gender, the bite force of natural teeth in men averaged 484.1±46.2N, while that of crowns was 445.3±43.7N. In women, the bite force of natural teeth averaged 373.7±15.4N, compared to 296.4±19.6 N for crowns. Conclusion 1. The bite force of zirconia porcelain crowns was 407.0±76N, while the bite force of metal porcelain crowns was 367.7±97N. 2. When determining the bite force of crowns and natural teeth, the bite force of crowns and natural teeth was 296.4±19.6N, and the bite force of uncoated teeth was 445.5±70N, respectively. 3. When compared by gender, the bite force of uncoated teeth in men was 484.1±46.2N, the bite force of coated teeth was 445.3±43.7N, and the bite force of uncoated teeth in women was 373.7±15.4N, and the bite force of coated teeth was 296.4±19.6N, and the bite force was significantly related to gender (p<0.0001).

Bullying or peers violation is one of adolescent`s truly urgent issue but it is not public discussion topic. We conducted a study in 3 different schools which began from 6th of October, 2014 to 13th of October, 2014. There are total 167 subjects aged between 13-18 were from classes of junior and senior- high at: Orchlon school, School of 1 and School of 13. We used 53- item Questionnaire consisted of 4 sections for our study. We concluded 98(58.7%) participants from School of 1, 26(15.6%) participants from School of 13 and 43(25.7%) participants from Orchlon school who were aged between 13-17 (M=14.7±0.1) which comprise of 84 (50.3%)male and 83 (49.7%) female in our study We assessed correlation of depression and bullying by linear regression. The result of it shows 1 more score of depression measuring scale-CES-D can rise score of Aggression scale 1 by 0.33 point and also it can rise score of Aggression scale 2 by 0.84 point. There is a positive correlation between bullying and depression which confirms high risk of bullying is associated with majordepression in significantly. (p value 0.000) The findings of the study reveals that high levels of bullying associated with high levels of depression.