Comparison of disinfectants by immersion and spray atomization techniques on the linear dimensional stability of different interocclusal recording materials: An in vitro study

Abstract

Objective:To evaluate and compare the effect of 0.5% chlorhexidine gluconate, 1% sodium hypochlorite, and 2% glutaraldehyde by immersion and spray atomization technique on the linear dimensional stability of Jet bite, Aluwax and Ramitec interocclusal recording materials.Materials and Methods:Three representative materials: Jet bite (addition silicone), Aluwax and Ramitec (polyether) were mixed according to manufacturer's instructions and then specimens were prepared according to the specifications of ISO 4823. All the specimens except the control (distilled water) were treated with disinfectant solutions (0.5% chlorhexidine gluconate, 1% sodium hypochlorite, and 2% glutaraldehyde) for 30 and 60 min (n = 10) by spray and immersion technique. Once removed from the solutions, the test samples were washed in water for 15 s, dried and measured after 24 h 3 times using a measuring microscope with an accuracy of 0.0001 mm. Two-way ANOVA and Tukey's test with significance level of 5% were used to assess the statistical data (α = 0.05).Result:All groups showed no significant difference statistically, in linear dimension when disinfected for 30 min by spray or immersion technique. Polyether had significantly higher dimensional variation when immersed in sodium hypochlorite for 60 min. Addition silicone showed the least dimensional change which ranged from 0.024% to 0.05%, followed by polyether from 0.004% to 0.171% and Aluwax from 0.146% to 0.228%.Conclusion:To preserve the dimensions and surface of the recording materials and effective microbial elimination, restrictions should be applied in the method of disinfection and time duration. However, using the disinfectants either by spray or immersion technique, the dimensional change was <0.5% which was not clinically significant according to the American Dental Association specification no. 19 criteria within the first 24 h.

Effect of Immersion and Spray Atomization Technique of Disinfection on Compression Resistance of Two Interocclusal Recording Materials.

“…There are two important factors to consider when choosing a disinfectant namely, its ability to eliminate microbial contamination and its effect on the resultant material. 8 So the American Dental Association in 1988, 1991 and 1996, and Council on Dental Materials, Instruments and Equipment in 1988 issued guidelines on disinfecting impressions both by immersion and spray atomization techniques. [8][9][10] The performance of sodium hypochlorite is based on cell oxidation.…”

“…Occupational safety and health association (OSHA) guidelines in 1996 required dentist, dental laboratory employers and other employers in health care fields to provide protection for their employees against the possibility of infection transmission by implementation of conscientious and consistent barrier controls. 8 There are two important factors to consider when choosing a disinfectant namely, its ability to eliminate microbial contamination and its effect on the resultant material. 8 Impressions are a potential vehicle in transmission of infectious agents.…”

“…8 There are two important factors to consider when choosing a disinfectant namely, its ability to eliminate microbial contamination and its effect on the resultant material. 8 Impressions are a potential vehicle in transmission of infectious agents. Moreover, cast produced from contaminated impressions may themselves be contaminated because microorganisms are able to migrate from impressions into the cast, while setting occurs.…”

“…So the American Dental Association in 1988, 1991 and 1996, and Council on Dental Materials, Instruments and Equipment in 1988 issued guidelines on disinfecting impressions both by immersion and spray atomization techniques. [8][9][10] Since only limited amount of data regarding the effect of immersion and spray atomization techniques on interocclusal recording materials are available in literature, this study intended to see the effect of immersion and spray atomization technique of disinfection on compression resistance of polyvinyl siloxane and polyether interocclusal recording materials.…”

Hand eczema among Lebanese dentists: An epidemiological study

“…23,24 Despite published case reports and patch testing results indicating its potential for sensitization and other toxic reactions, glutaraldehyde remains the sterilizing agent of choice in the cleaning of medical and dental equipment. This is due to its affordable cost, disponibility, disinfectant properties, stability, and the absence of any significant harmful effects on equipment.…”