In Vitro Study for Effect of Different Desensitizing Agents on Dentin Remineralization Elmaghrbi, Roya Mohamed Hamad; Ebraheim, Mokhtar Nagy; Ghallab, Omaima Hassan; Laithy, Ahmed Ahmed Aim: The purpose of this in vitro study was to evaluate the effect of: Casein phosphor peptide-amorphous calcium phosphate (CCP-ACP) paste, Desensitizing agent containing fluoride (ACPF),Fluoridated calcium phosphate(FT).On dentinal tubule occlusion and remineralization. Materials and Methods:: 42 sound anterior permanent bovine teeth were extracted from sacrificed bovine jaw, collected and cleaned from any residual tissues, were included in the study. The samples were divided to 3 group(n=14), demineralztion process was performed for all samples using citric acid 1%(PH=3.8), then remineralization process was achieved group 1:treated with (CCP-ACP) ,group 2 treated with ACPF, group 3:treated with (FT), for one week and other tow weeks ,Each group was evaluated by ESEM and EDX for four time according the treatment stages befor any treatment, after demineralization, after one week and tow week of remineralization Results: all the remineralizing agents used in this study was effective in remineralization process, Statistically, these results revealed no significant difference between the effect of 3 type of remineralizing agents . Conclusion: A. All the materials that used in this study were effective in dentin tubules occlusion. The time factor had a positive effect on the remineralization process. The tested materials was really similar, so the use of the most available and cheaper material in the market is effective

THE USE OF POSTERIOR COMPOSITE RESTORATIONS AMONG DENTAL PRACTITIONERS IN BENGHAZI LIBYA Benali, Nada Objectives: The aim of this study was to evaluate the attitudes of dental practitioners toward posterior composite restorations in terms of case selection and concerns. Materials and methods: 120 questionnaires were randomly distributed to the dental practitioners working in state and/or privet dental clinics in Benghazi. The questionnaires were designed to elicit information regarding case selection criteria and main concerns while placing posterior composite restorations. Results: 114 completed questionnaires were returned, 73 general dental practitioners and 41 specialists responded to the questionnaire. 36.8% of the dentists preferred composites for restoring only small defects and 35% selected composites for posterior restoration on patient demand. Conservation of tooth structure was the cause for placing 64.9%, esthetics for 57.8% and patient preference for placing 28% restoration by these dentists. 50% of the dentists reported concern in relation to isolation during composite placement, and 79.1% showed concern about polymerization shrinkage and microleakage. Differences in responses were not remarkable between general dental practitioners and specialists. Conclusion: Conservation of tooth structure and esthetics were the main reasons for selection of posterior composites. Posterior composite restorations were chosen mainly for small defects. Patient preference was given weightage for material selection.

Title – Isolation and Antimicrobial Susceptibility of Pseudomonas aeruginosa Associated with Suction Tubes and Waterlines at Dental Clinics in Benghazi City benali, nada; Elsanousi, OT; Amira, SH; Suzan, ME; Rashad, SG; Elham, OB; Khadija, MH Introduction: Bacterial biofilm including Pseudomonas aeruginosa (opportunistic hospital pathogen) in dental unit waterlines and evacuation system has become a global concern because they represent a life threating risks specially among immunocompromised patients as well as dental staff. Pseudomonas aeruginosa is frequently found as the leading cause of waterline contaminant in the dental clinics. In addition, data of identified bacterial species , particularly Pseudomonas aeruginosa, among dental units in Benghazi-Libya is spars. Objectives: To investigate the presence of Pseudomonas aeruginosa in waterlines and suction tubes among Benghazi dental clinics as well as determination the sensitivity testing of isolated bacteria with commonly used antibiotics Methods: A total of 196 sample were collected from different dental clinics in Benghazi (two teaching clinic, one private and one public). Selected units checked for the presence of P. aeruginosa in the dental chair are suction tubes and waterlines. Suspected psedomonus isolates were identified using universal biochemical tests and positive samples were preserved for sensitivity test. Results: A total of 196 samples were collected from private, teaching and public clinics, each sample consists from water line and suction tube swabs. All swabs were examined for presence of P. Aeruginosa. From the 115 water samples and suction tube swabs from teaching dental clinic (42.60%) P. aeruginosa strains were isolated: 18 (15.65%) from water line and 31 (26.95%) from suction tube swabs. Among the public clinics, 51 sample were collected, (29.41%) P. aeruginosa strains were isolated: 15 (29.41%) from suction tube swabs and no growth were detected from the water lines. Although, 30 samples from the private dental clinics were examined for the presence of P. aeruginosa the growth were detected in 5 (16.66%) and it was all from the water lines, and no growth were detected from the suction tubes swabs. Regarding antibiotic sensitivity, significantly, all the isolates were multidrug resistant. Ciprofloxacin showed the most sensitive antibiotic (80%-100%) among tested antibiotics while doxycycline exhibited the most resistant antibiotic (60%-100%). Conclusion: Although the percentage of P. aerogenosa being detected is considered low in this study, further sterilization precaution needs to face such multidrug resistant nosocomial pathogen among dental clinics in Benghazi. LEARNING POINTS/TAKE HOME MESSAGES 3 to 5 bullet points 1. More sterilization measures should be taken by all dental clinics in Benghazi to reduce the risk of transmission of microbial pathogen from dental chairs. 2. Increasing the samples collected to include more surfaces in the dental clinics. 3. Increasing the varieties of the antibiotic agents in continuing studies. 4. Further studies need in sterilisation area in Benghazi dental clinics on different pathogens. 5. Determination the most effective infection control protocols to be followed in Benghazi city.

Ectodermal Dysplasia: Features and Dental Management Bahjat, Roqaya; Herwis, Khadiga; Musrati, Ahmed Ali The current case report presents a rare clinical case of ectodermal dysplasia for a three years old Libyan child. The child’s parents were concerned about the missing dentition for their child at his age, and his malnutrition as consequence of the inability to eat healthy food. Clinical and radiographic examinations were carried to confirm the diagnosis and to make the proper treatment plan. A prosthodontic treatment offered to the child and he kept under observation.