Efficacy of various chlorhexidine disinfecting agents on the reduction of bacteria and dimensional stability of alginate impression material

Contaminated dental impression with saliva and blood provide a risk of cross infection for the dentist and dental laboratory staff. Microorganism from oral cavity in facts can survive on the impression surface and can be transferred to the stone castsThe aim of the study: To determine the effect of immersion of Chlorhexidine disinfection procedure on the contamination and dimensional stability of alginate impression materialMaterials and methods: 40 volunteer students were selected from Dental Department in the Collage of Medical and Dental Technologies in Baghdad with age ranged from 18-22 years (20 females and 20 males). The students have been classified into 4 groups each group of 10 students.After taking impression of upper dental arch by alginate, the impressions of the first group were immersed in tap water for 10 minutes (the control group).