Explore the vast range of titles available.

Background Artificial teeth replicate the appearance of natural teeth and restore proper alignment, oral function, and speech. Over the years, dental materials and prosthetic design advancements have transformed the creation and effectiveness of complete denture teeth. This evolution showcases a continued commitment to developing materials and methods that enhance the comfort, functionality, and visual appeal for patients without teeth. This study evaluated and compared patient satisfaction and oral health-related quality of life (OHRQL) between prefabricated and computer-aided design and computer-aided manufacturing (CAD-CAM) milled acrylic resin denture teeth. Materials and methods This crossover clinical study included 10 completely edentulous patients rehabilitated with complete dentures (CDs). Two types of acrylic resin teeth were used: prefabricated and CAD-CAM-milled artificial teeth. Crossover design is a research method that minimizes variability among participants by assessing the impact of various treatments on the same individual. This methodological approach facilitates the identification and measurement of the treatment effects. Following six months of complete denture wear, patient satisfaction and oral health-related quality of life were evaluated using the Visual Analogue Scale (VAS) and the Oral Health Impact Profile (OHIP-EDENT-19). Statistical analysis was conducted using the Wilcoxon signed-rank test in SPSS software, with statistical significance established at P  < 0.05. Results There was no statistical difference between the groups in the total VAS scores and items, except for chewing efficiency, with a P-value of 0.035, where CAD-CAM milled resin teeth had statistically higher scores. In contrast, prefabricated teeth had a statistically higher aesthetic score ( p  = 0.033). Regarding OHIP-EDENT-19, many items showed no statistical differences between the two groups, except for functional limitations and difficulty chewing, which had a P-value of 0.05 and were statistically higher in prefabricated teeth. In contrast, psychological discomfort ( P  = 0.034) and social disability ( P  = 0.046) had significantly higher scores for the CAD-CAM milled teeth. Conclusion This study suggests that prefabricated and CAD-CAM milled resin teeth are viable treatment options for complete dentures. Prefabricated teeth are advisable when aesthetics is the patient’s primary concern. Conversely, CAD-CAM milled teeth are preferable when chewing efficiency is the primary concern. Clinical trial registration Registered at www.clinicaltrials.gov : ( NCT06179615) (11-12-2023).

Background Occlusion plays a crucial role in the long-term success and prognosis of implant-supported overdentures. The method used to fabricate the overdenture base, whether conventional or CAD/CAM milled, could influence occlusal contact balance. However, definitive evidence on this matter remains lacking. Thus, this study aimed to compare two fabrication techniques, CAD/CAM milled and conventional, for four-implant-supported complete mandibular overdenture bases, with a specific focus on their impact on occlusal balance. Methods Edentulous patients participated in this study received four-implant supported mandibular overdentures constructed using two different types of overdenture bases: CAD/CAM milled and conventional bases. A total of 21 patients, representing 42 overdentures, were enrolled in the study. Occlusal adjustments were made for each overdenture after picking up of attachments. The patients were classified randomly and equally into two groups: Group I : patients delivered maxillary complete dentures opposed to four implant-supported mandibular overdentures constructed with CAD/CAM milling followed by conventionally constructed dentures. Group II : patients delivered maxillary complete dentures opposed to four implant-supported mandibular overdentures constructed with conventional method followed by CAD/CAM milled dentures. According to the type of denture bases, dentures were classified into two equal groups: Group A : CAD/CAM constructed overdenture bases. Group B : conventionally constructed overdenture bases. For each overdenture group, occlusal analysis measurements were recorded at overdenture delivery (T 0 ) and after three months of denture wearing (T 3 ). Data was analyzed using the Statistical Package of Social Science (SPSS) program. Repeated measures ANOVA were used to test significant differences in occlusal force distribution between observation intervals, groups and locations followed by Bonferroni post hoc test for multiple comparisons. Independent samples t-test was used to compare occlusal force between groups. P is significant if < 0.05 at confidence interval 95%. Results Comparing different occlusal contact locations in each group at (T 0 ) showed a significant difference between anterior and posterior locations whereas comparing different occlusal contact locations in each group at (T 3 ) showed a significant difference between molar and premolar locations for group B while insignificant between molar and premolar locations for group A. The comparison between different intervals within group A revealed insignificant differences while significant occlusal changes at premolar and molar regions were presented within group B. Conclusions The four implant-supported CAD/CAM milled overdenture bases offer greater advantages over conventional ones in terms of occlusal contact stability. Clinical Trial Registry Number (NCT06080815))08/10/2023).

Background This study aimed to evaluate two different construction techniques (conventional and 3D-printed techniques) for two implant-retained complete mandibular overdentures regarding mechanical wear of the occlusal surface using 3D digital analysis and occlusion force distribution using the digital occlusal analysis system (Occlusense). Methods Twenty patients were selected for this study from the prosthetic department, Faculty of Dentistry, Mansoura University. Each patient received two implants in the mandibular canine areas with locator attachments to retain the overdentures. According to the overdenture construction technique, all patients were randomly divided into two equal groups: the conventional heat polymerized overdenture group and the 3D-printed overdenture group. The mandibular overdentures were compared and evaluated immediately and after 12 months of insertion regarding mechanical wear of the occlusal surface using 3D digital analysis and occlusal force distribution using a digital occlusal analysis system (Occlusense). Results 3d printed group showed significantly higher occlusal surface wear than conventional group after twelve months (T12) with a p value ≤ 0.05. 3d printed group showed significantly more occlusal force distribution than conventional group with a p value ≤ 0.05. Also, there was a significant difference in occlusal force distribution with advance of time for each group, with a p value ≤ 0.05 level of significance. Conclusion Within the limitations of this study, it was shown that implant overdentures constructed by 3D-printing techniques offer a promising results in distribution of occlusal forces for achieving occlusal equilibration. However, in term of wear resistance more developments need to be done to improve material properties. Trial registration The study was approved by the local ethical committee of the Faculty of Dentistry, Mansoura University (No. A02060922) (6/9/2022) and retrospectively registered at ClinicalTrials.gov (ClinicalTrials.gov Identifier NCT06139003) (16/11/2023).

Objectives Traditional complete denture (CD) design and fabrication techniques need several clinical and laboratory steps. To improve the qualities of denture base material and get rid of all the problems that come with the conventional fabrication process, novel production methods were approved. In the field of denture manufacture, new materials and computer-aided technology have been explored as potential solutions. So, this study aimed to investigate the effect of two different digital construction techniques of implant-assisted overdentures on peri-implant and posterior mandibular bone resorptions by CBCT. Materials and methods Twenty patients who received mandibular overdenture constructed by different construction techniques were classified equally and randomly into two groups ( n  = 10 per group): Group M : received milled mandibular overdenture opposed by maxillary complete denture. Group P : received 3D-printed mandibular overdenture opposed by maxillary complete denture. Peri-implant bone loss and posterior ridge resorption were assessed at baseline (T0), at 1 year(T1), and 3 years(T3) by superimposition of pre and post-treatment CBCT.The Shapiro-Wilk test was used to access data that was not normally distributed. Two distinct groups were compared using the Mann-Whitney test. The Wilcoxon signed-rank test was used to compare paired groups. Results Regarding vertical bone loss(VBL), Group P recorded higher VBL in comparison to Group M, where the mean was 0.57 ± 0.13, and 0.52 ± 0.12respectively, at T1 and 0.66 ± 0.11, 0.60 ± 0.12 at T3. There was a statistically significant difference at different times of evaluation within the groups where ( P  < 0.001). Regarding posterior ridge resorption(PRR), Group P recorded higher PRR in comparison to Group M, where the mean was 381 ± 18.5, 333 ± 17.2 respectively at T1and 533 ± 24.9, 478.5 ± 12.3 at T3. There was a statistically significant difference at different times of evaluation within the groups where ( P  = 0.005). Conclusion Regarding the preservation of peri-implant alveolar bone and posterior ridge bone, milled implant-assisted complete overdentures may have more favorable clinical outcomes compared to 3D printed implant overdentures in the digitally constructed mandibular overdenture bases retained by two implants. Clinical relevance Both milled and 3D printed implant overdenture impression techniques can be used for the construction of CAD/CAM-implant retained overdenture base. However, in regarding the peri-implant alveolar bone and posterior ridge bone resorption, milled implant-assisted complete overdentures may have more favorable clinical outcomes compared to 3D printed implant overdentures retained by two implants. Clinical trial registry number (No.-NCT06720389) (03/12/2024).

Objective. Analyzing and comparing the fit and accuracy of removable partial denture (RPDs) frameworks fabricated with CAD/CAM and rapid prototyping methods with conventional techniques. Materials and Methods. The present systematic review was carried out according to PRISMA guidelines. The search was carried out on PubMed/MEDLINE, Cochrane collaboration, Science direct, and Scopus scientific engines using selected MeSH keywords. The articles fulfilling the predefined selection criteria based on the fit and accuracy of removable partial denture (RPD) frameworks constructed from digital workflow (CAD/CAM; rapid prototyping) and conventional techniques were included. Results. Nine full-text articles comprising 6 in vitro and 3 in vivo studies were included in this review. The digital RPDs were fabricated in all articles by CAD/CAM selective laser sintering and selective laser melting techniques. The articles that have used CAD/CAM and rapid prototyping technique demonstrated better fit and accuracy as compared to the RPDs fabricated through conventional techniques. The least gaps between the framework and cast (41.677±15.546 μm) were found in RPDs constructed through digital CAD/CAM systems. Conclusion. A better accuracy was achieved using CAD/CAM and rapid prototyping techniques. The RPD frameworks fabricated by CAD/CAM and rapid prototyping techniques had clinically acceptable fit, superior precision, and better accuracy than conventionally fabricated RPD frameworks.

This study aimed to assess the changes in maxillary master casts that occur during complete denture fabrication, focusing on a compression molded denture. Digital merging techniques were used to measure the changes in 12 maxillary master casts at various fabrication stages. Measurements were performed from master cast formation to teeth arrangement using scanable ball markers and digital overlay techniques. The changes observed in the master cast were categorized as follows: S12 for the alterations from cast fabrication to occlusal rim formation, S23 for the alterations from recording jaw relations to teeth arrangement, and S13 for the overall changes throughout the entire fabrication process. The posterior seal area exhibited the most significant changes, until the jaw relation stage (S12). Statistical analyses revealed significant differences in changes among anatomical areas at different fabrication stages. These findings underscore the importance of considering alterations in the master cast during denture fabrication, when using traditional methods. Traditional techniques, such as the flask-pack-press, can induce substantial alterations in areas critical for denture retention and stability. This study highlights the need for a comprehensive assessment of fabrication processes to enhance denture quality and patient satisfaction. It provides valuable insights into master cast alterations that occur during complete denture fabrication. Efforts to minimize deformations in master casts are essential for improving patient satisfaction and oral health outcomes.

This paper presents a computer-aided design (CAD) system for removable partial denture (RPD) frameworks, addressing the challenges of dentition defects. The system takes a digitized dental model obtained via optical scanning as input and generates an RPD framework model ready for 3D printing. Key technologies include spline curve editing and modeling, mesh offsetting, texture image-based modeling, and component models fusion. The system utilizes conformal mapping between the dental model and a disk. This enables spline curve editing to be executed in the parameterized 2D domain, ensuring both accuracy and efficiency. An iterative approximation method with adaptive mesh simplification is introduced to achieve precise mesh offsetting while avoiding self-intersections. Furthermore, texture mapping enables interactive modeling of holes for denture base connectors and 3D branch-like wax patterns for major connectors. An enhanced Boolean algorithm, combined with smoothing and simplifying techniques for intersecting regions, is utilized to ensure seamless and natural integration of various components. Clinical evaluations demonstrate that the system achieves a performance level comparable to advanced commercial CAD systems, having successfully completed over 30,000 clinical designs with high reliability and meeting all required standards.

The provision of removable partial dentures (RPDs) is an important skill for practitioners and it can often be challenging to make a successful prosthesis which the patient finds satisfactory. This three-part series has been designed to provide an overview of the clinical management of patients requiring RPDs. This final part describes more complex techniques that may be faced by dentists with additional training or experience in fixed and removable prosthodontics. These scenarios include the use of precision attachments to provide additional retention for an RPD, swinglock dentures to aid retention in cases with unfavourable tooth or alveolar undercuts, and sectional dentures for patients with challenging paths of insertion. For each clinical technique, the advantages, disadvantages and indications are summarised. Key points Provides an overview of precision attachments. Describes techniques for providing swinglock dentures. Discusses indications and clinical techniques for sectional dentures.

Objectives This study aimed to compare the trueness of one type of CAD/CAM milled complete removable dental prostheses (CRDPs) with injection-molding and conventionally manufactured CRDPs. Materials and methods Thirty-three CRDPs were fabricated by three different manufacturing techniques (group CAD/CAM (AvaDent™): n  = 11; group injection molding (Ivocap™): n  = 11; group flask-pack-press: n  = 11) using a single master reference model and incubated in artificial saliva for 21 days. The trueness of the entire intaglio surface along with five specific regions of interest (vestibular-flange, palate, tuberosities, alveolar crest, and post-dam areas) was compared. Non-parametric tests were used with a level of significance set at p  < 0.05. Results At baseline, there was no difference in the trueness of the total intaglio surfaces between the groups. After incubation, only the conventional CRDPs showed a significant improvement in trueness of the entire intaglio surface ( p  = 0.0044), but improved trueness was confirmed for all three techniques in most individual regions of interest. The 80–20 % /2 median quantile of the CAD/CAM group demonstrated the highest variability of individual readings, probably due to the size of the milling instrument. However, for all three techniques, 80 % of all deviations of the complete intaglio surface after incubation in saliva were below 0.1 mm. Conclusions In this in vitro study, the trueness of the intaglio surface of all three investigated techniques seems to remain within a clinically acceptable range. Additional research is warranted on material-related aspects, cost-effectiveness, clinical performance, patient-centered outcomes, as well as other CAD/CAM techniques for CRDP fabrication. Clinical relevance The intaglio surface trueness is an essential aspect in the clinical performance of CRDPs.

Background When designing removable partial dentures, maximizing the effectiveness of support and bracing is necessary to minimize denture movement. Therefore, it is essential to emphasize the importance of providing patients with appropriate, safe, and secure removable partial dentures and have clinicians rerecognize the concept and importance of support and bracing. This study aimed to present extension-base removable partial dentures through six specific clinical case series and describe the effect of support and bracing action on denture design, which is essential for denture movement minimization. A Case Series Study Case presentation: The case series highlights the importance of utilizing the contact between the axial surface of the abutment tooth and denture components to provide effective support and bracing action. Furthermore, it emphasizes the need to improve the bracing action by connecting the minor connector and proximal plate with the guiding plane set for multiple teeth (frictional control), control the direction of the denture during the placement/removal (path of insertion), and consider the major connector form to improve the support and bracing actions. Effective support and bracing actions are necessary not only for the retainer but also for the denture components, including the design of the denture base and major connector. Removable partial dentures with “frictional control” and “path of insertion” are expected to reduce denture movement and improve stability. Conclusions The denture design described in this study is essential in pre- and postgraduate dental education, and the author believes that it will be helpful for dental students, interns, or residents in clinical practice. Key Clinical Message In designing removable partial dentures, the importance of support and bracing effects that utilize the contact between the axial surface of the abutment tooth and the denture structure is required as a specific measure for minimizing denture movement.