Review articles are excluded from this waiver policy. New researches have shown that 67% of materials sent to dental laboratories are infected by various microorganisms [2]. Elastomeric Impression Materials. But immersion is not the method of choice for hydrocolloids material as they are extremely hydrophilic.3,34, In 1996, the American Dental Association council on dental materials endorsed immersion for polysulphide and addition silicone impression material whereas spraying with chlorine compound was advocated for disinfection of polyether impression material for 2-3 min.35 UV rays can be used for disinfection of water supplies, laboratory equipment, dental headpieces, dental impression and implants. By knowing all the methods and techniques, any dental personnel can make a better choice and get best results for impression disinfection. Iodophors: These halogens provide low to intermediate level disinfection. Ideally not recommended for impression disinfection as simple phenols are low level disinfectants.They are incompatible with latex, acrylic, rubber and cause acute toxicity as well.3,4, Chlorhexidine: It is an intermediate level disinfectant and antiseptic. Ann N Y Acad Sci.1950;53(1):191-6. The disinfection capacity of different agents can be increased as time elapses except for Pseudomonas aeruginosa which was eradicated completely in both 5 and 10 minutes. These studies showed that spray and immersion treatment of impressions using 0.5%, 2%, and 3.5% glutaraldehyde solutions for time ranging from 10 - 60 minutes did not cause any adverse effects on the accuracy or dimensional stability of PE and VPS impression material.6,7,8,9,10,11,12,13,14,15,16,17 Prolonged immersion of VPS impression materials overnight in … Readers Current Issue Past Issues Subscribe, Authors Editorial Board Sign-up as an Author Instructions for Authors Author Login, Reviewers Join as a Reviewer Reviewer Login, Journal of The Pakistan Dental Association, 3rd Floor, Mahmood Center BC-11, Block-9, Clifton Karachi, Pakistan, Phone: +92 21 35833172 Email:, Legal Disclaimer | Terms of Use | Privacy Policy. did a PubMed search between 1980 and 2005 on the effect of chemical disinfection, by immersions or spraying, on the impression’s dimensional changes. 2009;17(6):565-9. These are also known as protoplasmic poisons. The need to use a natural alternative for disinfecting dental impression materials, which should be biocompatible and effective, led us to evaluate the efficacy of Aloe vera as a disinfectant by immersion and spray method on alginate impression material and its effect on the dimensional stability of the resultant gypsum cast. ISRN Dent; 2012:1-5. Sunlight:- Active germicidal effect due to the combined effect of U.V and heat rays. Guiraldo RD, Borsato TT, Berger SB, Lopes MB, Gonini-Jr A,Sinhoreti MA. Westerholm [11] and Rueggeberg [12] and colleagues also showed that spraying sodium hypochlorite can effectively disinfect the impression materials. Biocontrol Sci. Although Epimax represented a significant difference with other disinfectants in 5 and 10 minutes in eradicating Staphylococcus aureus from alginate samples, there was no significant difference in its capacity in eradicating other microorganisms compared to other agents. Microbiol. Surface detail reproduction and dimensional accuracy of stone models: influence of disinfectant solutions and alginate impression materials. Two methods of disinfection of dental impression materials are commonly used; spray disinfection and immersion disinfection. According to results of the present study, it can be concluded that all three kinds of disinfectant agents effectively disinfected alginate. According to Table 1, the disinfection action of three mentioned disinfectants showed no significant difference after 5 minutes for Candida albicans and Pseudomonas aeruginosa, however, this difference was significant for Staphylococcus aureus. These chemical agents are chlorine compounds, phenols, iodophors, formaldehyde and gluteraldehyde. It is recognised that immersion disinfection can have deleterious effects on some proper-ties of the impression materials, for example dimensional accuracy, stability and wettability10-12. The grown fungus colonies of Candida albicans on SDA were counted after 72 hours. Since so many dentists are concerned about viruses such as HIV and HBV, further studies should be conducted to find an effective method to eradicate these kinds of pathogens. According to one study, aqueous ozone is more biocompatible than other disinfectant solutions e.g. Also the American Dental Association (ADA) has advised all dental stuffs to disinfect patients’ impression trays [5]. Ghahramanloo et al. However, studies show that among the population, the spreading rate of Staphylococcus aureus to the nasopharynx is only 10% [13]. exposure to UV light, steam autoclave, ethylene oxide gas autoclave, and radiofrequency flow discharge etc.3. Disinfection and Sterilization in Health CareFacilities: What Clinicians Need to Know? These results are also in accordance with the results of the present study. 2016;44(5):e1-6. 2018]. 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