The Journal of prosthetic dentistry · 2025
In vitro evaluation of disinfection efficacy and physical properties of polyether impression material after ultraviolet-C radiation with different exposure times and distances.
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Chada Tamonwan, Amponnawarat Aetas, Kamonkhantikul Krid, Homsiang Woraporn
Аннотация
STATEMENT OF PROBLEM: Polyether impression material may be susceptible to water absorption when exposed to chemical disinfectants, and ultraviolet-C (UV-C) radiation could serve as an alternative disinfection method. However, studies on the disinfection efficacy and physical properties of polyether material after UV-C radiation are lacking.
PURPOSE: The purpose of this in vitro study was to evaluate the disinfection efficacy, contact angle, and linear dimensional change of polyether impression material after exposure to UV-C radiation at varying times and distances.
MATERIAL AND METHODS: Disk-shaped polyether specimens were fabricated and divided into 12 groups based on 2 distances (8 cm and 16 cm) and 6 disinfection methods: no UV (UV0), UV radiation for 2.5, 5, 10, or 30 minutes (UV2.5, UV5, UV10, and UV30), and a 10-minute immersion in 0.5% sodium hypochlorite (NaOCl). Disinfection efficacy against Streptococcus mutans and Candida albicans, contact angle, and linear dimensional change were evaluated. Data were analyzed using the 2-way ANOVA with exposure times and distances as main factors, followed by the Tukey honestly significant difference test (α=.05).
RESULTS: For both microbes, the UV2.5, UV5, and UV10 groups at 8 cm exhibited a significant reduction in the number of residual microbial cells compared with those at 16 cm (P<.001). Conversely, the UV0, UV30, and NaOCl groups showed no significant differences (P>.05). Complete microbial eradication was achieved after 10 minutes of UV-C radiation at 8 cm and 30 minutes at 16 cm. Comparing exposure times, the number of residual Streptococcus mutans and Candida albicans cells significantly decreased as UV-C exposure time increased for both distances (P<.001). All groups exhibited no significant differences in contact angle compared with the UV0 group at either distance (P>.05), except for the UV30 group at 8 cm and the UV5, UV10, and UV30 groups at 16 cm. The percentage of dimensional change in all groups ranged from 0.11% to 0.31%, all of which were below the International Organization for Standardization specification limit of 1.5%.
CONCLUSIONS: A 10-minute UV-C radiation at 8 cm effectively disinfected polyether impression material, comparable with a 10-minute immersion in 0.5% NaOCl. A 30-minute UV-C radiation at either 8 or 16 cm effectively disinfected polyether impression material, enhanced surface wettability, and maintained dimensional stability.
PURPOSE: The purpose of this in vitro study was to evaluate the disinfection efficacy, contact angle, and linear dimensional change of polyether impression material after exposure to UV-C radiation at varying times and distances.
MATERIAL AND METHODS: Disk-shaped polyether specimens were fabricated and divided into 12 groups based on 2 distances (8 cm and 16 cm) and 6 disinfection methods: no UV (UV0), UV radiation for 2.5, 5, 10, or 30 minutes (UV2.5, UV5, UV10, and UV30), and a 10-minute immersion in 0.5% sodium hypochlorite (NaOCl). Disinfection efficacy against Streptococcus mutans and Candida albicans, contact angle, and linear dimensional change were evaluated. Data were analyzed using the 2-way ANOVA with exposure times and distances as main factors, followed by the Tukey honestly significant difference test (α=.05).
RESULTS: For both microbes, the UV2.5, UV5, and UV10 groups at 8 cm exhibited a significant reduction in the number of residual microbial cells compared with those at 16 cm (P<.001). Conversely, the UV0, UV30, and NaOCl groups showed no significant differences (P>.05). Complete microbial eradication was achieved after 10 minutes of UV-C radiation at 8 cm and 30 minutes at 16 cm. Comparing exposure times, the number of residual Streptococcus mutans and Candida albicans cells significantly decreased as UV-C exposure time increased for both distances (P<.001). All groups exhibited no significant differences in contact angle compared with the UV0 group at either distance (P>.05), except for the UV30 group at 8 cm and the UV5, UV10, and UV30 groups at 16 cm. The percentage of dimensional change in all groups ranged from 0.11% to 0.31%, all of which were below the International Organization for Standardization specification limit of 1.5%.
CONCLUSIONS: A 10-minute UV-C radiation at 8 cm effectively disinfected polyether impression material, comparable with a 10-minute immersion in 0.5% NaOCl. A 30-minute UV-C radiation at either 8 or 16 cm effectively disinfected polyether impression material, enhanced surface wettability, and maintained dimensional stability.