Objectives:The aim of this study was to compare the effect of the mandibular deformation by medial flexure on Bilaterally Splinted and Non-Splinted Implant-Supported Mandibular Full Arch Prosthesis with Immediately Loaded Implants both clinically & radiographically. In addition to Patients' satisfaction over one year of clinical performance. Materials & methods:For the sake of clinical investigation, twelve completely edentulous patients obtained new mandibular and maxillary complete dentures before implant placement. All patients were educated to use the denture for two months. After two months; patients were indiscriminately divided into two groups; First group (of six patients) obtained an Implant supported, fully-splinted cement-retained full arch prosthesis with immediate functional loading protocol, while Second group (of six patients) obtained an Implant-supported, non-splinted (segmented) cement-retained full arch prosthesis with immediate functional loading protocol. The clinical & the radiographic outcomes of the Implants supporting the cement retained full arch superstructure, had been calibrated at time of implants insertion, 3 months, 6 months and 12 months respectively. In addition, patients' satisfaction was also measured utilizing a customized chart of question (A seven-point scale).Results: regarding parametric data; repeated gauges ANOVA test was used to compare between the two groups as well as to study the changes by time within each group. Bonferroni's post-hoc test was used for pair-wise comparisons when ANOVA test is significant. whereas for non-parametric data; Mann-Whitney U test was utilized to compare between the two groups. Periotest and bone density data showed normal (parametric) distribution while bone loss and satisfaction scores data showed non-normal (non-parametric) distribution. Conclusion:Regarding effect of midline mandibular flexure on bilaterally splinted & nonsplinted(segmented) cement-retained, immediately-loaded mandibular prosthesis, it was found that, there was non-significant effect on both types of prosthesis and hence, splinted or nonsplinted implant-supported prostheses could be used successfully with little superiority of segmentation in midline region. In addition, Patients were completely satisfied with their implant-supported immediatelyloaded prostheses, whatever splinting protocol utilized.

Objectives: To evaluate and compare the accuracy of four different impression materials utilized in final impressions taking in mandibular edentulous cases using the Extra-oral digital scanning of impressions with EXOCAD software. Materials and Methods: Twenty middle-aged patients were selected, with completely edentulous arches. For each patient, four different mandibular final impressions were obtained using four different impression materials namely, 1. Zn/O Eugenol, 2. Rubber Base single-step, 3. Silginat 4. Monophase impression materials. All four impressions were scanned using an Extra-oral scanner (Medit T710 Extra-oral laboratory Scanner). Two measurements were taken for each virtual cast and compared. Results: One-way ANOVA test and Tukey's post hoc test for multiple comparisons of measurements were used. Generally, there were no statistically significant differences in measurements. Conclusions: Zn/O and Eugenol have always been considered the gold standard of secondary impression materials for completely edentulous ridges. This study concluded that the more recent Rubber Base, Silginat, and Monophase impression materials proved to possess equivalent accuracy.

No abstract