Casts obtained from the direct nonsplinted transfer impression technique were significantly less accurate than those obtained from the other impression techniques used in this study.

Aim:To compare between conventional heat cured Acrylic resin and Flexible thermoplastic resin denture base materials on microbial colonization of complete dentures in Controlled Diabetic patients. Material & Methods: This study included thirty completely edentulous well controlled diabetic patients which were divided into two equal groups, fifteen patients received complete dentures made of conventional heat cured acrylic resin dentures while the other fifteen patients received upper complete denture made of flexible poly amide (Bre-flex 2ndedtion) thermoplastic dentures and lower heat cured acrylic resin denture. Oral swabs for isolation of microorganisms was done with gamma sterilized disposable swabs from tuberosity area under the fitting surface of the dentures, each swab cultivated in three culture media. Statistical analysis was performed for the results of this study to evaluate the microbial colonization in each of the two groups. Results: Candida was the most common isolate in acrylic resin group and was detected in 6 cases (40%) and Streptococci were observed in 3 cases (20%). Chi square test revealed a significant difference in the percentage of Candida species were the most common isolate in breflex group and were detected in 3 cases (20%). Staph Aureus and Streptococci were observed in 2 cases each (13%). Chi square test revealed a significant difference in the percentage of cases affecting by each type of microorganisms (p<0.00001).cases affecting by each type of microorganisms by Cfu (ml)x102. Conclusion: Flexible thermoplastic resin denture is thus a more predictable treatment modality as a denture base material due to its less microbial colonization and biological reaction in addition to its better esthetic appearance.

Purpose: to evaluate the effect of using two treatment modalities on the alveolar bone height in flat ridge cases. Materials and methods: Ten completely edentulous male patients were selected. Age of the patients ranged from 55-65 years old. All patients had resorbed lower ridges. The patients were divided into two groups, five patients each. All group (A) Patients received conventional flexible denture while, all group (B) patients received overdenture supported by single sympheseal implant. Mandibular bone height was measured by Cone Beam Computerized Tomography (CBCT) for both groups using stent containing radio-opaque stainless steel wires at posterior region corresponding to (5, 6,7) denture teeth at the time of flexible denture/overdenture delivery and 6, 9, 12 month after. Results: Regarding intergroup comparison of the change in bone height (%) group (A) had a higher mean value of bone height changes than group (B) which was found statistically not significant. Regarding frequency and percentage values for patient satisfaction questionnaire answers there were no significant differences in the answers of both groups. Conclusion: Within the limitation of this study, it could be concluded that, there was no significant difference between flexible complete denture group and single implant flexible overdenture group regarding posterior mandibular bone resorption and patient satisfaction.