Denture fracture is a common problem with acrylic dentures. The fractured denture can be repaired using various techniques such as self-cure acrylic resin acrylic resin and fiber-reinforced acrylic resin. The purpose of this study was to compare the accuracy of dentures repaired with self-cure acrylic resin and fiber-reinforced acrylic resin processed using two different techniques (long-cure and microwave processing). A total of 20 maxillary complete dentures were processed with two techniques; heat (long cycle) processing (10 dentures) and microwave processing (10 dentures). The maxillary cast and denture surface were scanned with Medit intraoral (Medit i700, Medit, South Korea) and STL files were created. Then, the dentures were sectioned at the midline and repaired using self-cure acrylic resin and fiber-reinforced acrylic resin and scanned with Medit intraoral. Finally, adaptation deviations were analyzed from computer software (Geomagic Control X, 3D Systems Inc., USA). The adaptation deviations in each group (long cure and microwave) were compared using an Independent T-test. Two-way ANOVA was done to see whether curing techniques and repairing methods affect the accuracy of repair. A P-value of 0.05 was considered significant. The adaptation deviation was slightly higher in the fiber-reinforced acrylic resin group (0.565 ± 0.093) than in the self-cure acrylic resin group (0.536 ± 0.066). However, there was no statistical difference in the adaptation deviations of repaired dentures with self-cure acrylic resin and fiber-reinforced acrylic resin in the long-curing (P-value 0.245) and the microwave (P-value 0.638). Similarly, the adaptation deviation was slightly higher in the long-curing group (0.577 ± 0.075) than in the microwave group (0.524 ± 0.079). However, there was a statistically significant difference in the adaptation deviation of repaired dentures between long-curing and microwave techniques with self-cure acrylic resin (P-value 0.016) but no difference in fiber-reinforced acrylic resin (P-value 0.127). The result of Two-way ANOVA shows that there is no statistically significant interaction between curing techniques (long curing and microwave) and repairing methods (self-cure acrylic resin and fiber-reinforced acrylic resin) for adaptation deviations (P-value 0.646). However, the curing techniques show statistically significant differences (P-value 0.039). Acrylic dentures can be repaired with self-cure resin or fiber-reinforced self-cure resin using various processing methods. The accuracy of the denture after repair is unaffected by the repairing method (self-cure acrylic resin and fiber-reinforced acrylic resin) but the accuracy of the denture after repair is affected by the curing techniques (long-curing and microwave). In self-cure resin, the microwave processing showed higher adaptation deviation and less accuracy, whereas the long-curing processing showed lower adaptation deviation and high accuracy.

Purpose: The objective was to evaluate metal base adaptation and clinical retention of upper complete dentures with a CO-CR metal palate constructed by two different approaches (casting a 3d printed wax resin pattern, Selective laser melting (SLM) 3D printing technology). Material and methods: A total of seven completely edentulous patients were included in this study, for each patient two complete dentures were fabricated. According to the approach used for the fabrication of metal palatal plate (MPP) of the maxillary denture, they divided into two groups (GI: MPP constructed by casting a 3d printed wax resin pattern ,GII: MPP constructed by direct 3d printing. (Selective laser melting (SLM)). To evaluate the adaptation of each MPP, Surface matching software was used to superimpose the scan files for each MPP on those for the corresponding processing cast. Retention force was measured one week and one month following denture insertion using a digital force gauge. The measurements were taken and subjected to statistical analysis. Results: better adaption was found for MPP constructed via casting 3d printed resin pattern than those by direct printing approach. However, the difference between the two groups was statistically non-significant, with clinically accepted retention following denture insertion. Conclusion: Within the limitations of this study, it was found that complete maxillary dentures with MPP constructed by casting a 3d printed resin pattern introduced better adaptation than those constructed via direct 3d printing (Selective laser melting technology. However, the difference between both groups was statistically non-significant. Both approaches revealed clinically accepted retention.

Purpose: The objective of the research was to investigate dimensional accuracy concerning denture teeth deviation and vertical dimensional changes for three-dimensional printed, monolithic dentures relative to heat-cured, acrylic resin dentures. Materials and methods: A waxed-up reference maxillary denture was constructed on an educational master cast, and then duplicated to produce ten simulated waxed-up dentures. The planned virtual denture was designed by subtracting the scanned cast from the scanned waxed-up denture with the cast. This virtual denture was considered as a reference and saved alone in 3D- Standard Tessellation Language (STL) format. From this reference (CAD maxillary denture) ten DLP dentures were fabricated. Each fabricated heat-cured, and 3D-printed denture was scanned separately, and the scanned data was saved in an STL file. Each STL file of scanned maxillary dentures was superimposed on a reference virtual maxillary denture to evaluate the degree of denture teeth deviation. An electronic digital caliper was used to measure the occlusal vertical dimension (OVD) of the waxed-up denture and after denture fabrication for both groups to evaluate the change in OVD. Results: A paired t-test was used to compare the recorded data between both groups. It was reported that the higher mean values for either denture teeth deviation or vertical dimensional changes after dentures fabrication were noticed in heat-cured acrylic resin dentures. These values were highly statistically significant between the tested groups for both items of investigations at p ≤ 0.01.

Introduction: The oral mucosa provides an optimal environment for the colonization of microorganisms and fungi, exhibiting a variety of biological habitats. The accumulation of biofilm on dentures significantly contributes to the development of denture stomatitis. Mouthwashes have been proven to exhibit an antiseptic effect and are widely used due to their antimicrobial effects. This research aims to examine the antibacterial efficacy of three types of mouthwashes as denture cleansers for people with denture stomatitis. Methods: Sixty patients were chosen from removable prosthodontics clinics and were categorized into groups treated with three different types of commercial mouthwashes (Tantum Verde, Hextol mouthwash, and Orovex). Subsequently, swabs were collected from each patient, and the fungal growth of Candida albicans was evaluated. Results: All studied mouthwashes (Tantum Verde, Hextol mouthwash, and Orovex) effectively decreased the quantity of bacteria on dentures. Mouthwashes containing chlorhexidine showed better results on the inhibition of the growth of C. albicans in comparison to other mouthwashes. Discussion: Maintaining proper oral hygiene for dentures is crucial for preventing and treating denture stomatitis. Chemical disinfectants are recognized for their significance over mechanical cleaning, such as effective disinfection and simplicity. Mouthwashes serve as an efficient method for cleaning dentures, and prolonged use may impact the material characteristics of the dentures, including surface roughness and coloration. Conclusions: Tantum Verde, Hextol, and Orovex mouthwashes are effective in decreasing the C. albicans on dentures. The chlorhexidine mouthwashes show better results than other mouthwashes. Furthermore, using a wider array of microorganisms in future investigations might provide a more thorough comprehension of their involvement in denture-related complications.