Aim: This systematic review aimed to evaluate the effects of immersion and spray disinfection on the dimensional

stability of conventional dental impression materials.

Materials and Methods: A comprehensive electronic search, conducted following the PRISMA framework, was

performed across four databases (PubMed/MEDLINE, Scopus, DOSS, and Cochrane Library) for studies published

between 2010 and 2022. Inclusion criteria encompassed in vitro and ex vivo studies assessing the effect of chemical

disinfection by immersion or spray on alginate, addition silicones, condensation silicones, and polyether impression

materials. The risk of bias was assessed using the Joanna Briggs Institute (JBI) checklist.

Results: Fifty-seven studies met the inclusion criteria. Spray disinfection generally resulted in non-significant

dimensional changes across all materials. Immersion in sodium hypochlorite at concentrations above 1% most

frequently produced dimensional alterations, particularly in alginate impressions. Silicone based and polyether

materials exhibited higher dimensional stability regardless of the disinfection method.

Conclusion: Spray disinfection appears to preserve dental impression dimensional stability more effectively than

immersion. Disinfectant type, concentration, and exposure time are critical factors influencing dimensional stability.

Clinicians should adhere to manufacturer recommendations to balance infection control with dental impression

dimensional stability.

Keywords: Infection control, Chemical disinfection, Dimensional stability, Dental impression materials.