Background: Virulence factors of denture stomatitis had been contributed mostly to Staphylococcus aureus and Candida Albicans as an etiological basis in addition to immunodysfunction related to type of denture base and significant Ab-Ag reaction according to individual immune response. This study aimed to evaluate gold electro plating effect on Staphylococcus aureus and Candida Albicans colonization in addition to assessment of its cytotoxicity level. Subjects and Methods: Twelve maxillary completely edentulous patients were randomly divided into; Group I (control group): Completely edentulous patients rehabilitated with maxillary complete dentures reinforced with Cr-Co palatal plate and Group II (experimental group): Completely edentulous patients rehabilitated with maxillary complete dentures reinforced with Cr-Co palatal plate which were galvanic electro-plated by gold. Follow up assessment of Staphylococcus aureus, Candida Albicans and cytotoxicity level of Group I and Group II. The collected data were further statistically analyzed using SPSS and GraphPad statistical software. Results: Using One Way ANOVA followed by Tukey's post hoc test for multiple comparisons regarding microbiological evaluation, there was a significant difference among follow up periods for both groups. Using Independent t-test for comparison between both groups, was a significant difference especially after two weeks, 30 days and 45 days. While for cytotoxicity level, Gold-Plated experimental group showed insignificant higher cytotoxic effects than Cr-Co control group using Chi-Square test. Conclusion: Gold electroplating showed an antibacterial effect and lower rate of Candida Albicans colonization while it showed higher levels of cytotoxicity.

Background: Treatment challenges for completely edentulous patient have traditionally been described as a combination of esthetics, function and comfort. Some studies regarding complete denture esthetics were more important than function or comfort. Denture characterization is modification of the form of the denture base to produce a more natural appearance. Materials and Methods: Acrylic resin complete dentures had been divided into two groups according to flasking technique (group I as control group: conventional three pour flasking technique, group II as test group: silicone mask flasking technique). ΔE was calculated for both groups immediately and after seven days of exposure to different staining conditions (Smoke, Coffee and Tea). Results: Heat cured acrylic resin complete denture processed through silicone mask flasking technique showed statistically significant lower ΔE values (as P < 0.05) than conventionally processed heat cured acrylic resin complete denture. Conclusion: With the limitations of this study regarding color stability change (ΔE), depending on flasking technique; the conventional three pour flasking technique showed a higher amount of color change (lower color stability) than the silicone mask flasking technique regarding smoking, tea and coffee coloring agents.

Objectives: To evaluate and compare the accuracy of four different impression materials utilized as final impressions taken in mandibular edentulous cases, employing the Photo analysis technique.Materials and Methods: Ten patients were selected, with completely edentulous arches. For each patient, four different impressions mandibular impressions were obtained using four different impression materials namely, 1. Zn/O Eugenol, 2. Putty and Light PVS Rubber Base, 3. Silginat 4. Monophase. All four impressions were boxed, and all were poured using type IV dental stone. Casts were then photographed using a digital camera with fixed, repeatable specifications, and digital photographs were then introduced into computer software (Digimizer® Software V. 4.3.1). Two measurements were taken for each cast and compared.Results: For each analysis method (photo analysis method using Digimizer® software, oneway analysis of variance (ANOVA) was performed to evaluate the level of significance between impression types followed by Tukey`s post hoc test for multiple comparisons. The significant level was set at P ≤ 0.05. Generally, there were no statistically significant differences in measurements between tested impression materials.Conclusions: Zn/O and Eugenol have always been considered the most accurate final impression material utilized in edentulous cases. This study revealed that the more recent, Rubber Base, Silginat, and Monophase impression materials proved to possess equivalent accuracy measured by the Photoanalysis method.

Background: Occlusal unbalance is considered a major challenge for complete denture wearers. It could affect functional intra oral stability and decreases patient desires related to complete dentures as a definite treatment plan.Materials and Methods: Twelve mandibular complete dentures had been divided into two groups according to retentive protocol into group (C) as a control group: who received conventional heat-cured acrylic resin mandibular complete dentures, group (U) as test group: who received conventional heat-cured acrylic resin mandibular complete dentures retained by ultrasuction device. T-Scan occlusal load analysis system was used to evaluate the balanced occlusion existence on the complete denture followed by OHIP questionnaire administration to the patients to evaluate patient satisfaction. Studying the effect of time over six months' follow-up for each group performed by paired t-test and comparison between group (C) and group (U) were performed using Independent t-test at the level of significance ≤ 0.05. Results:Considering balanced occlusion of both groups, they showed a significant difference between both sides posteriorly before adjustments (46.5%, 39.9% and 45%, 37.7%) and an insignificant difference between both sides posteriorly after adjustments (38.3%, 41.6% and 49.6%,49.3%) after one month except for group (C) which showed a significant difference after six months (38.3%, 41.6% and 44.5%, 39.7%) posteriorly between both sides. Investigated domains showed a higher significant difference for group (C) about oral health's effect on the quality of life (42.8±11.69). Conclusion:Ultra Suction retained mandibular complete dentures revealed better-balanced occlusion and patient satisfaction than ordinary mandibular complete dentures.

Background: The demonstration of moderately simple sterilization-disinfection measures in daily practice is very serious to decrease the probabilities of cross-infection as prosthetic appliances have to be sterilized prior to be transferred to the technician and patient. The used disinfection method should be properly selected due to its great effect on the physical and mechanical properties of denture bases. Aim: This research was conducted to study the consequences of chemical and electromagnetic radiation disinfection methods on dimensional stability and oral health impact on daily performance. Also, to evaluate the effect of repeated microwave disinfection under different conditions. Materials and Methods: Group I: Denture disinfection using (1%) sodium hypochlorite for 10 minutes. Group II: Denture disinfection using electromagnetic radiation (650 W for 3 minutes / once per week) and divided into 2 subgroups: Group II-A: Dentures kept dry during microwave disinfection. Group II-B: Dentures kept wet in distilled water during microwave disinfection. Group III: Denture disinfection using electromagnetic radiation (650 W for 3 minutes / twice per week) and divided into 2 subgroups: Group III-A: Dentures kept dry during microwave disinfection. Group III-B: Dentures kept wet in distilled water during microwave disinfection. Dimensional stability and patient satisfaction using (OIDP) questionnaire were evaluated after one- and three-weeks follow-up periods. Results: Comparison between dimensional changes after 1st & 3rd week revealed insignificant difference in dimensional changes regarding Group I (expansion) & GII-A & GII-B (Shrinkage) after 3rd week as P > 0.05. On the other hand, there was a significant difference (shrinkage) in GIII-A & GIII-B after the 3rd week as P<0.05. Oral health impact on daily performance (OIDP) revealed insignificantly decreased after 3rd week in all groups except GIII-B as OIDP significantly decreased. Conclusion: Complete denture disinfection with sodium hypochlorite preparation showed the least dimensional change (Expansion) with higher patient satisfaction, while electromagnetic radiation treatment (microwave) of complete dentures showed higher dimensional change with lower patient satisfaction especially in wet conditions.