Impact of disinfectants on the mechanical properties of acrylic materials used in dental prosthetics
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Katedra Protetyki Stomatologicznej i Ortodoncji, Uniwersytet Jagielloński Collegium Medicum, Wydział Lekarski, Polska
Kliniczka Ortodoncji, Ortodoncja Profesora Lostera, Polska
Centrum Innowacyjnej Edukacji Medycznej, Uniwersytet Jagielloński Collegium Medicum, Polska
Submission date: 2023-07-20
Final revision date: 2023-08-30
Acceptance date: 2023-09-22
Publication date: 2023-09-22
Corresponding author
Małgorzata Julia Łazarz-Półkoszek   

Katedra Protetyki Stomatologicznej i Ortodoncji, Uniwersytet Jagielloński Collegium Medicum, Wydział Lekarski, Montelupich 4, 31-155, Kraków, Polska
Prosthodontics 2023;73(3):248–256
In order to reduce the transmission of pathogens between the dental office, dental laboratory and the patient, it is necessary to properly disinfect the denture. During the COVID-19 pandemic, it was recommended to disinfect dentures through exposure to UVC rays or with 1% hydrogen peroxide solution.

Aim of the study:
To assess the effect of both methods of disinfection on the mechanical strength of acrylic materials.

Material and methods:
Three materials: Villacryl H Plus (M1), Villacryl SP (M2) and Villacryl S (M3) were used to make ten samples of each material, which were then divided into two groups.The plates in the first group were soaked in a 1% hydrogen peroxide solution for 30 minutes, and then irradiated with UVC rays for 30 minutes. Samples from group 2 (control) were subjected to load tests without prior disinfection. Flexural strength was tested using the INSTRON 3345 in the three-point method. The obtained breaking forces [N], multiplied by the area of fracture, gave the result of bending stress [MPa], which was subjected to statistical analysis.

The greatest change was noted for Villacryl S (M3). The mean stress value decreased from 71MPa to 54MPa and was statistically significant (p=0.05). Similarly, Villacryl H Plus (M1) changed its properties to a statistically significant extent. The average stress value decreased from 56MPa to 42MPa (p=0.05). The smallest stress difference was noted for the Villacryl SP (M2) material (from 80MPa to 72MPa) and it was statistically insignificant.

The use of two methods of disinfection affects the strength properties of dental acrylics.