Abstract
Aims: The aim of this study was to evaluate the effect of mixing different concentrations of chlorhexidine, iodine ,and sodium hypochlorite solutions on the setting time and dimensional change of alginate impression material. Materials and methods: Total number of samples (40) has been prepared in this study. Ten samples for control group made from pouring alginate impressions of metal model .The other groups made by mixing alginate with 0.05% iodine, 0.5% chlorhexidine and 0.5% sodium hypochlorite solutions. Dimensional change was measured with AutoCAD program .The Setting time was also measured for each group. Statistical analysis was performed using ANOVA and Duncan multiple range test. Results: no significant difference in the linear dimensional change among the tested groups ,sodium hypochlorite added to alginate as disinfectant showed the highest dimensional changes among the other groups. There was a significant difference among the tested groups in the setting time. It was found that treating the alginate with sodium hypochlorite and chlorhexidine disinfecting agents accelerated the setting time of the material. Conclusion: The testing disinfecting agents can be used safely regarding dimensional change.
Highlights
Dental practitioners, patients, and laboratory personnel are subjected to notable risks with respect to infectious diseases, which can be spread by saliva or blood from contaminated impression material, Al – Rafidain Dent J Vol 18, No1, 2018 irreversible hydrocolloid impression material.(1) An impression material must have dimensional stability to cause the overall success of the cast made from it. (2)
MATERIALS AND METHODS In this study the impression material used was alginate Hydrogum- soft (ZhermackItaly) .The disinfectant solution used were: 0.05% iodine solution (Konix –Germany) 0.5 % chlorhexidine gluconate (ToselTurkey) 0.5% sodium hypochlorite (Clorox-Saudi Arabia) A metal model resembles the maxillary edentulous alveolar ridge with 3 reference marks were used for this study, one of the marks was found on the anterior region near the incisive papilla, the other two marks were positioned on the right and the left 2nd premolar region (Figure 1)
B .Evaluation of setting time: There was a significant difference among the tested groups in the setting time (Tables 3,4).It has been found that mixing the alginate with the disinfectant agents such as sodium hypochlorite and chlorhexidine solutions resulted in acceleration of the setting time of alginate compared to the control specimen
Summary
Patients, and laboratory personnel are subjected to notable risks with respect to infectious diseases, which can be spread by saliva or blood from contaminated impression material, Al – Rafidain Dent J Vol 18, No1, 2018 irreversible hydrocolloid impression material.(1) An impression material must have dimensional stability to cause the overall success of the cast made from it. (2). Al-Nema LM of various disinfectants and methods of disinfecting impression materials, but the results of those studies varied widely. The role of a disinfectant should, ideally, be of a dual purpose, it must be an effective antimicrobial agent, yet cause no adverse response to the dimensional accuracy and surface features of the impression material and the resultant gypsum cast.(3). Spray and immersion methods are the two most widely used techniques in clinical practice. These conventional strategies present several disadvantages like loss of surface detail and dimensional inaccuracy of the impression.(4) Due to the difficulties with the disinfection of alginate impression materials, selfdisinfecting alginate impression materials were developed. The aim of the present investigation was to examine the effect of several disinfecting solutions on alginate impression material. The objectives to achieve this aim were: To assess the dimensional accuracy and to assess the setting time
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