RT - Journal Article T1 - Comparison of the self-antimicrobial effect of six irreversible hydrocolloid impressions on oral flora microorganisms JF - JIDA YR - 2010 JO - JIDA VO - 22 IS - 3 UR - http://jida.ir/article-1-773-en.html SP - 161 EP - 166 K1 - Alginate K1 - Disinfection K1 - Staphylococcus aureus K1 - Pseudomonas aeruginosa K1 - Candida albicans AB -   Comparison of the self-antimicrobial effect of six irreversible hydrocolloid impressions on oral flora microorganisms     Dr. Ansari-Lari H.,1 Dr. Sazvar MR.,1 Dr. Atash-Razm P.,1 Dr. Rastegarian H.,2 Dr . Epakchi S.,3   Dr. Moharamnejad N.4   1 Assistant Professor, Department of Prosthodontics, School of Dentistry, Islamic Azad University. Tehran, Iran.   2 Assistant Professor, Department of Microbiology, School of Dentistry, Islamic Azad University. Tehran, Iran.   3 Dentist. 4 Dentist, Craniomaxillofacial Research Center, Dr. Shariati Hospital, Tehran University of Medical Sciences. Tehran, Iran.     (Received 3 March, 2010 Accepted 16 August, 2010)     Abstract     Background and Aim : The infection transmission by impressions to the laboratory is growing concern for clinicians and laboratory technicians. This study aimed to compare the self-antibacterial effect of six irreversible hydrocolloid impression materials (Iralgin, Xantalgin, Tropicalgin, Plastalgin, Hydrogum and Orthoprint) on oral flora microorganisms.   Materials and Methods : In this experimental set-up, 108 irreversible hydrocolloid specimens including alginate disks with 1 mm thickness, 5 mm diameter and 30±2 mg weight, and 18 sterile paper disks as negative control specimens (totally 126 specimens) were prepared. These specimens were transferred to Staphylococcus aureus (Group 1), Pseudomonas aeruginosa (Group 2) and Candida albicans (Group 3) fresh microbial environments. After 48 hours incubation in 37 degrees Celsius, the maximum growth inhibition zone diameters were recorded. Statistical analysis was performed by ANOVA or Friedman test.   Results : No zone of inhibition was observed around the control specimens. Iralgin and Tropicalgin specimens had significant growth inhibition on Group 1. Tropicalgin more than Iralgin and Iralgin more than the other specimens significantly inhibited Group 2 microorganisms. Plastalgin specimens had significant growth inhibition on Group 3 (P < 0.05).   Conclusion : Some of the investigated alginates had self-antibacterial effects however, disinfection of impressions with other techniques are still inevitable.   Key words : Alginate - Disinfection - Staphylococcus aureus - Pseudomonas aeruginosa - Candida albicans .     Corresponding Author : Dr. Moharamnejad N ., Dentist, Craniomaxillofacial Research Center, Shariati General Hospital, Tehran University of Medical Sciences. Tehran, Iran.   e.mail: nima_mnj@yahoo.com LA eng UL http://jida.ir/article-1-773-en.html M3 ER -