Objectives: The aim of the study was to evaluate the accuracy of surgical templates for guided implant surgery using 3D printing. Patients & Methods: Twenty-four patients were examined for implant placement. Each implant site was planned virtually and a 3D printed surgical guide was constructed. The implant had been installed using the 3D printed surgical guide. Postoperative CBCT was performed, and the images were superimposed on the virtual planning images. The amount of coronal, apical, and angular deviation was calculated. Results: A total of 48 implants were placed in 24 patients. Elven patients were completely edentulous while the other 13 patients where partially edentulous. Mean angular deviation of the implants placed in partially and completely edentulous patients 4.1±0.1 and 3.3±0.78 degrees respectively. While the mean deviation coronally was 1.5±0.3 and 1.1±0.5 mm in partially and completely edentulous patients respectively. The deviation at the apical portion showed a mean 2.1±0.3 and 2.2±0.5 mm in implants placed in partially and completely edentulous patients. Statistical significant difference between the partially and completely edentulous arches where found in coronal and angular deviation while the apical deviation showed no significant difference. Conclusion: A high accuracy in implant placement can be achieved using 3D printed surgical guide.

Purpose:The aim was to compare the effect of using different number of implants (two and four implants) on marginal bone loss around implant in implant -bar supported mandibular overdenture.Material and methods: Twelve edentulous patients were randomly divided into two groups. Group I received two implants-bar supported overdenture while group II received 4 Implantsbar supported overdenture. Fixtures were surgically inserted with its top level 0.5mm below the crestal bone level. Each patient was recalled two months after implant insertion for superstructure placement. Crestal bone loss around the implants were measured on CBCT images taken at time of final prosthesis pick-up, 3 months, 6 months and 12 months after overdenture pickup. Repeatedmeasure ANOVA with Tukey post hoc test was used to compare between the two groups at the different time points.Results: There was a significant main effect of time on bone resorption (p<0.001). however, there was no significant main effect of group on bone resorption (p= 0.132). There was no significant interaction between time and group. Multiple comparisons showed a significant difference between the baseline and 12 month time point in each group (p=0.006 and p=0.041, respectively). Also, there was a significant difference in bone resorption between the two groups at 12 month time point (p=0.044). Conclusion:Four implants-bar supported overdenture provided better preservation of marginal bone than two implants-bar supported overdenture. Therefore, its recommended for clinicians to consider the design of four implants-bar supported overdenture specially when the bone of jaw is compromised.

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Objectives: This study aimed to evaluate the clinical and radiographic outcomes of the xenograft in the extraction socket following the surgical removal of impacted mandibular third molar. Patients & Methods: The study was conducted on sixty patients with asymptomatic bilateral impacted mandibular third molars. The molar on one side was extracted and xenograft (Bio-oss® Geistlich Pharma AG, Switzerland) was placed in the extraction socket (study side); the molar on the other side was extracted two weeks later and the extraction socket was left to heal naturally (control side). Results: Pain, maximal incisal opening and swelling were significantly improved in the study group when compared to the control group. Values of bone density were higher in the study group throughout the follow-up period. Conclusion: Incorporation of xenograft material plays an important role in increasing the alveolar bone density, enhancement of postoperative pain, swelling, range of mouth opening and gives better wound healing.

Objective: to compare the accuracy of three different denture base materials used in maxillary edentulous arch Materials and Methods: ten patients were selected, with completely edentulous arches, for each patient three finial PMMA denture bases were done using different construction technique pack and press, computer aided design/ computer aided manufacturing CAD/CAM milled and selective laser sintering (SLS) PMMA denture base All denture bases in this study were submitted for CBCT scanning for dimension accuracy and volume linear evaluation. Results:The mean and standard deviation values were calculated for each group in each test. Data were explored for normality using Kolmogorov-Smirnov and Shapiro-Wilk tests, data showed parametric (normal) distribution. A statistically significant difference was found between (Heat cure acrylic denture), (CAD/CAM denture) and (Laser sintering denture) Conclusion: also press and pack technique is more time consuming regarding number of visits but less dimensional changes than CAD/CAM and (SLS) selective laser sintering.