KNOWLEDGE AND PRACTICE ON DISINFECTION OF DENTAL IMPRESSIONS AMONG DENTISTS AND DENTAL TECHNICIANS

Abstract

Background: Dental impressions are a common source for transmission of infection between dental clinics and dental labs. Dental impressions can be cross-contaminated by patient’s saliva and blood, which then cross-infect the dental casts poured from the impressions.

Aim of the study: To evaluate the current practices of disinfection of dental impressions and their protocols and to assess the knowledge of cross-infection control among dentists and dental technicians.

Materials & Methods: A self‑administered questionnaire will be distributed to dentists and dental technicians about their practices of disinfection for dental impressions. , the questionnaire consists of two separated parts, one is concerned with dentists and the other with dental technicians. Data were collected from forty dentists and twenty dental laboratory technicians.

Results: According to our findings, only 32.5% of dentists had an infection control by mean of disinfection of impressions, 67.5% of them were not care about disinfection of impressions. In the other hand, 70% of respondent’s dental technicians follow a protocols of impressions disinfection, the other 30% were not interested in disinfection of impressions or casts.

Conclusion: Dentists practices in impression disinfection was not satisfactory, therefore, education programs about impression disinfection are needed. Unlike dentists, dental technicians had a better knowledge and practice about disinfection of dental impressions.

Keywords:

Dental impression, disinfection, dental technician

References

Lewis D, Arens M, Harllee R, Michaels G. Risks of infection with blood-and saliva-borne pathogens from internally contaminated impressions and models. Trends & techniques in the contemporary dental laboratory. 1995;12(5):30-29.

Rodríguez IV. Cross contamination clinic-dental laboratory: Magnitude of the problem and proposal for action: Universidade de Santiago de Compostela; 2021.

RC L. Schonfeld SE, Gypsum Casts as a potential source of microbial cross contamination J. Prosthet. Dent. 1983; 49:210-11.

Powell GL, Runnells RD, Saxon BA, Whisenant BK. The presence and identification of organisms transmitted to dental laboratories. The Journal of prosthetic dentistry. 1990;64(2):235-7.

Kramer A. Schwebke I, Kampf G. How long do nosocomial pathogens persist on inanimate surfaces? A systematic review. BMC Infect Dis. 2006;6(130):16914034.

Uttlová P, Urban J. Hand disinfectants and their activity against clinical isolates of Bordetella pertussis. Central European Journal of Public Health. 2022;30(4):230-4.

Dahiya P, Kamal R, Sharma V, Kaur S. “Hepatitis”–Prevention and management in dental practice. Journal of Education and Health Promotion. 2015;4.

Hardan L, Bourgi R, Cuevas-Suárez CE, Lukomska-Szymanska M, Cornejo-Ríos E, Tosco V, et al. Disinfection procedures and their effect on the microorganism colonization of dental impression materials: a systematic review and meta-analysis of in vitro studies. Bioengineering. 2022;9(3):123.

Somasundram J, Geetha R. Disinfection of impression material-a review. European Journal of Molecular & Clinical Medicine. 2020;7(1):2451-60.

Demajo JK, Cassar V, Farrugia C, Millan-Sango D, Sammut C, Valdramidis V, et al. Effectiveness of disinfectants on antimicrobial and physical properties of dental impression materials. The International journal of prosthodontics. 2016;29(1):63-7.

Merchant VA, McNeight MK, Ciborowski CJ, Molinari JA. Preliminary investigation of a method for disinfection of dental impressions. The Journal of Prosthetic Dentistry. 1984;52(6):877-9.

Gorman S, Scott EM, Russele A. Antimicrobial activity, uses and mechanisms of action of glutaraldehyde. Journal of Applied Bacteriology. 1980;48(2):161-90.

Takigawa T, Endo Y. Effects of glutaraldehyde exposure on human health. Journal of occupational health. 2006;48(2):75-87.

Fukuzaki S. Mechanisms of actions of sodium hypochlorite in cleaning and disinfection processes. Biocontrol science. 2006;11(4):147-57.

Guiraldo RD, Borsato TT, Berger SB, Lopes MB, Gonini-Jr A, Sinhoreti MAC. Surface detail reproduction and dimensional accuracy of stone models: influence of disinfectant solutions and alginate impression materials. Brazilian dental journal. 2012;23:417-21.

Hiraguchi H, Kaketani M, Hirose H, Yoneyama T. Effect of immersion disinfection of alginate impressions in sodium hypochlorite solution on the dimensional changes of stone models. Dental materials journal. 2012;31(2):280-6.

McDonnell G, Russell AD. Antiseptics and disinfectants: activity, action, and resistance. Clinical microbiology reviews. 1999;12(1):147-79.

Chidambaranathan AS, Balasubramanium M. Comprehensive review and comparison of the disinfection techniques currently available in the literature. Journal of Prosthodontics. 2019;28(2):e849-e56.

Touyz L, Rosen M. Disinfection of alginate impression material using disinfectants as mixing and soak solutions. Journal of Dentistry. 1991;19(4):255-7.

Wang J, Wan Q, Chao Y, Chen Y. A self-disinfecting irreversible hydrocolloid impression material mixed with chlorhexidine solution. The Angle Orthodontist. 2007;77(5):894-900.

Kollu S, Hedge V, Pentapati KC. Efficacy of chlorhexidine in reduction of microbial contamination in commercially available alginate materials—in-vitro study. Global J Med Res. 2013;13(2):19-24.

Klironomos T, Katsimpali A, Polyzois G. The effect of microwave disinfection on denture base polymers, liners and teeth: a basic overview. Acta stomatologica Croatica. 2015;49(3):242.

Samra RK, Bhide SV. Comparative evaluation of dimensional stability of impression materials from developing countries and developed countries after disinfection with different immersion disinfectant systems and ultraviolet chamber. The Saudi dental journal. 2018;30(2):125-41.

Al Mortadi N, Al-Khatib A, Alzoubi KH, Khabour OF. Disinfection of dental impressions: knowledge and practice among dental technicians. Clinical, Cosmetic and Investigational Dentistry. 2019:103-8.

Savabi O, Nejatidanesh F, Bagheri KP, Karimi L, Savabi G. Prevention of cross-contamination risk by disinfection of irreversible hydrocolloid impression materials with ozonated water. International journal of preventive medicine. 2018;9.

Johnson G, Chellis K, Gordon G, Lepe X. Dimensional stability and detail reproduction of irreversible hydrocolloid and elastomeric impressions disinfected by immersion. The Journal of prosthetic dentistry. 1998;79(4):446-53.

Suprono MS, Kattadiyil MT, Goodacre CJ, Winer MS. Effect of disinfection on irreversible hydrocolloid and alternative impression materials and the resultant gypsum casts. The Journal of prosthetic dentistry. 2012;108(4):250-8.

Lepe X, Johnson GH, Berg JC, Aw TC, Stroh GS. Wettability, imbibition, and mass change of disinfected low-viscosity impression materials. The Journal of prosthetic dentistry. 2002;88(3):268-76.

Shetty S, Kamat G, Shetty R. Wettability changes in polyether impression materials subjected to immersion disinfection. Dental Research Journal. 2013;10(4):539.

Doddamani S, Gangadhar S, Patil R. Efficacy of various spray disin- fectants on irreversible hydrocolloid impression materials: an in vitro study. Indian J Dent Res. 2011; 22:764–769. doi:10.4103/0970- 9290.94662.