Effect of heat sterilization and chemical method of sterilization on the polyvinyl siloxane impression material. A comparative study

Comparative analysis of dimensional changes in autoclavable polyvinyl siloxane (PVS) impressions under various Sterilization/Disinfection Protocols: A randomized controlled trial

“…Our findings come in accordance with Mohd et al, who found that the changes in dimensions of PVS exposed to microwave irradiation and chemical disinfection have been noted to fall within the clinically acceptable limit established by the ANSI/ADA standard ( R Mohd et al, 2021 ). In addition, Asopa et al concluded that the linear dimensional changes in autoclaved PVS impressions fall within the ADA clinically accepted ranges; hence PVS impression is acceptable for short–span prosthesis fabrication ( Asopa et al, 2020 ). Reddy et al subjected PVS samples to an autoclaving cycle under 134 °C for 18 min; however, they recommended autoclavable PVS material for making multiple units of restorations rather than full mouth restorations ( Reddy et al, 2013 ).…”

“…P-values less than and equal to 0.05 were considered statistically significant. SPSS version 22, Inc., IBM was used for statistical analysis ( Asopa et al, 2020 ). Dimensional accuracy expressed as a percentage (L) was calculated following ISO 4823 (1977) using the equation L = [(L2 – L1) / L1] x 100, where L1 is the original dimension on the master model and L2 is the final dimension after disinfection /autoclaving.…”

“…Regarding dental impression disinfections, it is crucial to consider both the antibacterial effectiveness and its impact on the dimensional stability of impression materials ( AlZain, 2020 ). Using typical sterilization techniques like extended immersion or high-temperature approaches like autoclaving could impact the physical characteristics and dimensions of PVS impressions ( Asopa et al, 2020 ).…”

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“…Although immersion disinfection minimizes the danger of crossinfection, changes in the dimensions of impression materials and a detrimental influence on the quality of the resultant cast have been often recorded [5,6]. Therefore, there is a possibility that the dimensions of the dental cast prosthesis may vary, which will eventually have an effect on how well the final restoration will fit [7]. Daily dental practice often involves washing impression materials with tap water, as the Advisory British Dental Association Service recommended.…”

Dimensional changes of commercial and novel polyvinyl siloxane impression materials following sodium hypochlorite disinfection

“…Disinfection through immersion reduces the risk of cross infection, yet alteration in dimensions of impression materials and negative impact on quality of the resulting cast has often been reported ( Guiraldo et al, 2012 ; Martin, Martin & Jedynakiewicz, 2007 ). This might result in dimensional changes in dental cast prosthesis and ultimately affect the fit of the final restoration ( Asopa et al, 2020 ). Iwasaki et al (2016) reported marked changes in the dimensions of alginate impressions due to water sorption after prolonged immersion in a disinfectant solution ( Iwasaki et al, 2016 ).…”