Effect of chemical disinfection on surface detail reproduction and dimensional stability of a new vinyl polyether silicone elastomeric impression material

Abstract

Background: Surface detail reproduction (SDR) and dimensional stability of elastomeric impression material play a crucial role in fixed prosthodontics. Aim and Objectives: The aim of this study was to compare the effect of chemical disinfection on SDR and dimensional stability of polyvinyl siloxane (PVS) and polyether (PE) with a new vinyl polyether silicone (VPES) elastomeric impression material. Materials and Methods: A stainless steel mold was made to fabricate the study specimens for nonaqueous PVS, PE, and VPES elastic dental impression materials. Single mix impression techniques with light- and heavy-body consistency of all three materials were used to prepare the test specimens. The specimens were immersed in glutaraldehyde (Cidex) 2.45% and sodium hypochlorite (Hypo) 3.0% disinfection for 15 min (T1) and 12 h (T2) immersion after which dimensional stability and SDR were recorded using stereomicroscope and digital Vernier caliper. Statistical Analysis: The data were analyzed using the one-way ANOVA, paired t -test, Kruskal–Wallis test, and Wilcoxon signed-rank test. Results: Dimensional stability at the T2 time interval showed a highly significant difference for control and glutaraldehyde groups ( P < 0.001), whereas a statistically significant difference for Hypo group ( P < 0.05). SDR of the three materials when compared at T1 time interval showed a statistically significant difference ( P = 0.015). A comparison between two disinfectants at T1 time interval revealed a highly significant difference ( P < 0.001), while at T2 interval significant difference was obtained ( P = 0.009). Conclusion: VPES impressions display acceptable dimensional stability and SDR for clinical use with immersion disinfection. Although some statistically significant differences in linear dimensional stability and semidefinite programming were observed among VPES, PE, and PVS, but the clinical impact of these differences is minor considering the overall accuracy of casts which was high.

Assessment of dimensional stability of novel VPES impression material at different time intervals with standard disinfectants

“…These findings were in correlation with the results of the present study as the dimensional changes in the test samples were within clinically acceptable range both for 10 mins and 30 mins. A thirty-minute glutaraldehyde disinfection time was recorded in only one investigation, whereas a three-minute Cavex disinfection time was observed in another [22,25]. The immersion technique with a ten-minute disinfection interval was employed in most of the studies.…”

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

“…Additionally, Weżgowiec et al found that the chemical immersion disinfection method had no significant impact on the dimensional stability of the PVS impressions ( Weżgowiec et al, 2022 ). However, Khatri et al reported significant dimensional changes at a 3 % NaOCl concentration using the same duration for immersion disinfection ( Khatri et al, 2020 ). The observed dimensional changes might have been influenced by the 12-hour waiting period after disinfection, which could explain the variation in the results.…”

Soluciones desinfectantes aplicadas a impresiones dentales antes del COVID -19 y en la actualidad.

“…Se ha observado microorganismos potencialmente patógenos después de la toma de la impresión como es el caso de: Streptococcus, Staphylococcus, Staphylococcus aurerus, ,Staphylococcus resistente a la meticilina, Escherichia coli, Mycobacerium, tuberculosis, cándida además de virus de hepatitis B, C virus de la inmunodeficiencia humana, virus de herpes simple (6-8-15-16). La principal desventaja de la desinfección son los cambios dimensionales que se pueden presentar al ser expuesto a este proceso (3)(4)(5)(6)(7)(8). La elección de desinfectantes depende de la toxicidad, el daño que puede generar a la superficie, la estabilidad y la rapidez de eliminación microorganismo (17).…”

“…Presenta una concentración del 2 al 2,15% (7), además su acción consiste en fijarse a la membrana y bloquear la liberación de componentes celulares lo que destruye a los microorganismos (2).…”

“…El objetivo de una desinfección es eliminar o destruir microorganismos patógenos que transmiten enfermedades como: VIH, virus de la hepatitis C, Hepatitis B, neumonía, tuberculosis (6) ,COVID-19 que encuentran en la superficie de la impresión y mantener la estabilidad de la misma (2,(7)(8)(9).…”