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Background The All-on-four dental implant method is an implantology method designed to provide a comfortable prosthetic treatment option by avoiding advanced surgical procedures. This research aims to compare and evaluate the stress and tension values in conventional angled multiunit abutment-implant connection systems and monoblock dental implants used in the all-on-four procedure with finite element analysis. Methods Two master models were created by placing four implants connected to multiunit abutments (group A) in the interforaminal region of a completely edentulous mandible and four monoblock implants (group B) in the same region of another completely edentulous mandible. Group A implants were classified according to their diameter as follows: 3.5 mm (M1A), 4.0 mm (M2A), and 4.5 mm (M3A). Similarly, group B implants were classified as M1B, M2B, and M3B. In the six models rehabilitated with acrylic fixed prostheses, a 100 N force was applied to the anterior implant region, and a 250 N force was applied to the posterior cantilever in both axial and 30° oblique directions. Von Mises stresses were analyzed in the bone and implant regions of all models. Results M1A and M1B, M2A and M2B, and M3A and M3B were compared with each other under axial and oblique forces. The maximum Von Mises stresses in the bone around implants and the prosthesis screws, and the maximum and minimum principal stresses in the cortical and trabecular bone in group A models were significantly higher than those in group B models. Conclusions In monoblock implant systems under axial and oblique forces, higher stress is accumulated in the bone, prosthesis screw and implant compared to multiunit abutment-implant connection systems.

This present study aimed to evaluate the education of YouTube videos about wisdom tooth surgical removal for viewers. In this study, the term “wisdom tooth surgical removal” was searched on YouTube. After excluding duplicates, irrelevant videos, non-English-language videos; 92 relevant videos in English were independently examined by 3 reviewers. The videos were categorized as ‘poor’, ‘moderate’ and ‘excellent’ by scoring 9 points in order to evaluate the information they provided to the audience. Chi-square test was performed for categorical variables and differences between groups were compared with ANOVA-Kruskal Wallis. Correlations were analyzed using Pearson and Spearman test. Statistical significance was set P < 0.05. Majority of the videos (63%, n = 58) were uploaded by layperson for sharing personal experience, 19.6%, (n = 18) healthcare professionals (dentist, orthodontist, surgeon). There were 64 (69.6%) not useful videos, 19 (20.7%) moderately useful videos, and 9 (9.8%) very useful videos. There is no significant correlation between efficiency ratio and source of upload (P > 0.05). There is a significant relationship between efficiency ratio and interaction index (P = 0.019 < 0.05). Interaction indexes of poor useful videos are more than others. There is a significant relationship between the type of video and video demographics (all data’ significant values < 0.05). Mean values of patient's experience are more than others. Healthcare professionals should be aware of the accuracy of information on the internet in order to guide patients.

Summary Background/Aim: A factor affecting the success rate of dental implants, which has been used successfully for many years, is the implant-abutment connection system. The purpose of this study was to evaluate the stress distribution of different implant-abutment connection systems under different forces. Material and Methods: This in vitro study included a finite element analysis. In the study, the cylindrical and screwed dental implants available in 3 different diameters from 4 different companies were categorized into 12 different models. Two different scenarios of force application were conducted on each model in this study. In the first scenario, 100 N force and 100 N moment were applied in a vertical direction onto a point considered as the center of each tooth. In the second scenario, a 100 N force and moment were applied at a 45° angle in an oblique direction. Results: As a result of the forces applied to dental implants of different diameters from different companies, octagon implant-abutment connection systems had less stress accumulation than hexagon implant-abutment connection systems. In addition, when stress accumulation ratios were evaluated according to the diameter of the implants used, it was observed that 3 mm diameter implants accumulated more stress in bone than 4 mm diameter implants; there was no significant difference between 4 mm diameter implants and 5 mm diameter implants. Conclusions: Implant-abutment connection system is important for the longevity of implants under the forces. Therefore, this factor should be considered during implant selection.