In patients with newly established ideal occlusion through full-mouth rehabilitation using fixed prostheses, complications and occlusal changes over time can arise because of various factors. This case report describes a 10-year follow-up of a patient with masticatory dysfunction and aesthetic problems who underwent full-mouth rehabilitation with an increased vertical dimension.During the follow-up, complications such as tooth fracture, occlusal changes, infraocclusion of few implant-supported prostheses, and loss of interproximal contacts were observed. Detecting these issues early through periodic follow-up is important. This case report aims to review the causes of complications after full-mouth rehabilitation using fixed prostheses and the strategies for their management.

Temporomandibular disorder is a disease caused by various factors such as trauma, mental stress, occlusal factors, and parafunc-tional habits. Among them, many scholars have been interested in the relationship between occlusion and temporomandibular disorder for a long time and have conducted numerous studies, but controversy over this relationship continues to this day. Based on previous studies, this review clearly establishes the relationship on occlusion and temporomandibular disorders and presents the direction for follow-up research by summarizing the limitations of current studies.

Through the use of intraoral scanners, it is possible to obtain intraoral scan impressions and produce prostheses. This approach isalso being attempted not only in dentate patients but also in edentulous patients. However, obtaining scans of edentulous areas can be more challenging than scanning dental areas, and there may be limitations, especially in capturing the details of the mucosal tissues. On the other hand, when obtaining impressions with intraoral scanners, simultaneous recording of the occlusal relationship of the maxilla and mandible can reduce the number of patient visits and expedite the restoration process. In this case, we aimed to combine the advantages of direct intraoral scanning and indirect digital impressions obtained after traditional impression-taking by merging two types of scan files. Consequently, in patients with partially edentulous arches, we sought to provide effective in-terim prostheses through direct and indirect digital model impressions and report our findings accordingly.

Purpose: This study analyzed raw data from the 2022 Korean Community Health Survey (KCHS) to explore the relationship between physical activities and the mental health of middle-aged individuals, and examined factors influencing chewing discomfort. Materials and Methods: Data pertaining to 104,500 middle-aged people aged between 40 and 64 were analyzed. The variables analyzed included general characteristics, perceived level of health, level of oral health, physical activities, mental health (PHQ-9), and statusof chewing discomfort. Cross-analysis was conducted to explore the differences in general characteristics, physical activities, mental health factors, and chewing discomfort status. Meanwhile, logistic regression analysis was performed on factors influencing chewing discomfort. Results: It was observed that chewing discomfort was more severe for middle-aged individuals who reported that theiroral health level was neither good nor poor compared with those who reported that their oral health was good (OR: 8.443, P < 0.001), those who reported that their perceived level of health was poor (OR: 49.173, P < 0.001), those who reported not performing the walking exercise (OR: 1.354, P < 0.001), those who reported that they had suicidal ideation compared with those who did not (OR:2.543, P < 0.001), those who reported that they had made a suicidal attempt compared with those who had not (OR: 4.456, P < 0.001), and those who reported that their level of depression was severe or more serious (OR: 4.624, P < 0.001). Conclusion In middleaged individuals, physical activities and mental health needs to be considered as a risk factor in the improvement of oral health.

To enhance the predictability of aesthetic treatment outcomes in aesthetic prosthetic restorations, considerations must include analysis of facial features, the relationship between teeth and lips, proportions of tooth width/length, gingival form, and more.Traditional diagnostic wax-ups have limitations in considering the patient’s facial features and are unable to facilitate rapid formmodifications. With recent advancements in digital technology, it is now possible to digitize the patient’s facial features in three dimensions, enabling the design of restorations that harmonize with facial features. These digital workflows not only improve efficiency but also provide patients with faster visualization of treatment outcomes, thereby enhancing motivation. Therefore, in this case, a treatment plan is devised to utilize digital diagnostic wax-ups considering the patient’s facial features for the finalprosthetic design.

Purpose: This study aims to investigate the effects of provisional restoration fabrication methods and surface polishing on surface roughness and microbial adhesion through in vitro experiments. Materials and Methods: 120 cylindrical provisional restorationresin blocks (10 × 10 × 2.5 mm) were manufactured according to four fabrication methods, and 30 specimens were assigned toeach group. Afterwards, they were divided into non-polishing group, #400 grit SiC polishing group, and #800 grit SiC polishinggroup and polished to a 10 × 10 × 2 mm specimen size (n = 10). The surface roughness Ra and Ry of the specimen was measuredusing a Surface Roughness Tester. Three specimens were extracted from each group and were coated with artificial saliva, and then Streptococcus mutans were cultured on the specimens at 37°C for 4 hours. The cultured specimens were fixed to fixativesand photographed using a scanning electron microscope. For statistical analysis, the two way of ANOVA was performed for surfaceroughness Ra and Ry, respectively, and the surface roughness was tested post-mortem with a Scheffe test. Results: The fabrication method and the degree of surface polishing of the provisional restorations had a significant effect on both surface roughness Ra and Ry, and had an interaction effect. There was no significant difference in Ra and Ry values in all polishing groups in DLP and LCD groups. Conclusion The fabrication method and surface polishing of the provisional restoration had a significant effect on surface roughness and showed different adhesion patterns for S. mutans adhesion.

Purpose: The purpose of this study was to investigate the accuracy of image merging of an intraoral scan of an edentulous arch to a facial scan using wax rim and markers. . Materials and Methods: For registration of oral scan to face scan, a wax rim with markers wasmade. The markers were cuboid and divided into four groups according to size (5, 10 mm) and attachment location (midline, canine region). The evaluation of registration accuracy was compared with a standard created using cone-beam computed tomographydata. Anterior linear variation of the edentulous arch and the 3D variation of the overall arch were measured. Kruskal-Wallis test and Mann-Whitney U test were used for statistics, and the significance level was set at 0.05 and evaluated under Bonferroni correction (0.05/6 = 0.083). Results: In the anterior deviation and global deviation results, there was no statistically significant difference in the oral scan position displacement values between the 5 mm and 10 mm groups. When the midline marker was used, the intraoral scan position displacement value was significantly lower than when only the canine marker was used. Conclusion Marker attached wax rim can be used for image matching between facial and intraoral scans of the edentulous arch. Marker location at the middle area increases the accuracy of image matching.

Purpose: The purpose of this study was to investigate the accuracy of digital mounting with occlusal scans in the interocclusal record for a full-mouth fixed prosthetic treatment condition. Materials and Methods: The entire maxillary teeth were prepared in a dentiform model and attached to an articulator in maximum intercuspation. Temporary crowns were fabricated and occlusion was adjusted. After scanning the arch with tooth preparation, digital mounting was performed using an occlusion scan of the anterior or posterior teeth areas. The accuracy of the positioned jaw relation was evaluated three-dimensionally through positional deviation and angular error of the occlusal plane. Afterwards, the same procedure was repeated on the partially edentulous model to evaluate the accuracy of digital interocclusal record. Kruskal-Wallis test and Mann-Whitney U test were used for statistical analysis, and the significance level was set at 0.05. Results: There was no significant difference in the positional error at the centerof the arch in the digitally established jaw relation depending on the scan area used and remaining tooth conditions (P = 0.53). Theangular error of the occlusal plane was larger when the anterior teeth were used as the overlapping area, and a smaller error value was observed when both posterior teeth were used as the overlapping area (P < 0.001). Conclusion The use of bilateral posterior occlusal scans is recommended when digitally mounting the jaw relation established with temporary teeth during full-mouth fixed prosthetic treatment.

Recently, several attempts have been made to integrate AI into the field of dentistry. To overcome the limitations of traditionalfixed prosthetic fabrication methods such as CAD-CAM (computer-aided design-computer-aided manufacturing), AI programs arebeing developed for automated crown fabrication, and various studies are underway to applicate in clinical situation. In these casestudies, single-unit fixed prostheses were fabricated using an AI program (Dentbird Crown, Imagoworks Inc, Seoul, Korea) in boththe anterior and posterior regions and the fabrication time and accuracy were compared with previously used CAD-CAM method.The first case is a 44-year-old woman who presented for re-fabrication of a zirconia prosthesis due to a prosthesis fracture on thelingual side of the upper right lateral incisor. The second case is a 53-year-old male patient who presented for a crown restorationon an upper left first molar following root canal treatment, where he received a final zirconia restoration. In both cases, the firstprosthesis was designed manually using a CAD program, the second prosthesis was designed using AI alone, and the third prosthesis was designed using AI and then modified by CAD program, and the three designs were superimposed to compare suitability. When evaluated after temporary placement, the final prosthesis demonstrates adequate stability, retention and support, resulting in functional and esthetic satisfaction.

Purpose: The aim of this study was to determine which scan range would provide the most accurate bite registration when perform-ing a bite scan after scanning an upper and lower arch using an intraoral scanner. Materials and Methods: The occlusal contact points were recorded using articulating paper for 30 adults, and the results of various ranges of buccal bite scan were compared based on this. Buccal bite scan of 5 ranges (1st premolar to 2nd premolar, 1st premolar to 1st molar, 1st premolar to 2nd molar, 2nd premolar to 1st molar, and canines to another side canine of the maxillary teeth) was performed, and then the buccal bite scan file was used in a CAD program to confirm the occlusal area in the scan file through data editing and alignment, leaving the buccal area of the teeth. Afterwards, the degree of agreement between the occlusal contact points obtained from the articulating paper and the occlusal area obtained from the scan file was compared, and statistical analysis was performed using the homoscedastic Ttest (α = 0.05). Results: The alignment success and alignment failure rates among each group were 77.23% and 40.85% in canine to another side canine, 68.23% and 28.89% in bilateral first premolar to second premolar, 63.76% and 29.97% in bilateral first premolar to first molar, 61.31% and 32.04% in bilateral first premolar to second molar, 67.55% and 27.46% in second premolar to first molar.The results of the anterior scan of both canines showed higher alignment success and failure rates compared to the scan results ofall maxillary posterior teeth. In the alignment success rate, statistical significance was not found depending on the scan range of the posterior teeth, but in comparing the results of the posterior teeth and both canines, statistical significance was observed except for the scan results of the second premolar to the first molar. There was no statistical significance in the alignment failure rate depend-ing on the scan range of the posterior teeth, and statistical significance was observed in the results of the posterior teeth and bothcanines. Conclusion When taking a buccal bite scan, in the case of scanning the anterior teeth, more occlusal area appear than when scanning the posterior teeth, and in the case of scanning the posterior teeth, there is no significant difference in the bite reg-istration depending on the scan range.