EVALUATION THE EFFECT OF VARIOUS MODEL OBTAINING METHODS ON BACTERIAL REPRODUCTION OVER THE SURFACE OF MODELS MADE FROM TWO DIFFERENT IMPRESSION MATERIALS

Aim: the aim of this study was to evaluate the effect of various model obtaining methods on bacterial reproduction over the surface of models made from two different impression materials. materials and methods: seven healthy dentate individuals aged 20-30 years were selected and 56 impressions were made. for this study hydrocolloid and elastomeric impression materials were used. according to the model casting method, impressions materials were divided into four groups: group 1: impressions with no treatment. group 2: impressions were only water rinsed. group 3: impressions were only disinfected with sodium hypochlorite (1:10). group 4: impressions were water rinsed and then disinfected with sodium hypochlorite (1:10). after gypsums hardening, the models were retrivied from impressions. for all groups bacterial swabs were collected with dry sterile cotton swab in mid palatal region of models. the samples were inoculated in blood agar media and incubated for bacterial growth for 3 days at 37 °c in incubator. results: the results showed that the lowest bacterial growth on impressions were identified in group with water rinsed and then disinfected with sodium hypochlorite (1:10) (group 4) and the highest bacterial growth on impressions were identified in group with no treatment (group 1) for the both impression materials. for both impression materials, bacterial growth on impressions with sodium hypochlorite disinfection (1:10) was less than impressions with no treatment and impressions with only water rinsed. conclusion: as a result of this study it can be concluded that only washing with water is not effective method for the control of infections, sodium hypochlorite (1:10) reduces the bacterial growth on gypsum casts for both impression materials.