Effect of Application Time of Two Different Disinfectants on the Surface Roughness of an Elastomeric Impression Material

Abstract

Introduction: Pathogens, such as cytomegalovirus, hepatitis B virus, hepatitis C virus, herpes simplex virus types 1 and 2, and human immunodeficiency virus are transmitted, threatening the health of dental laboratory workers, especially as a result of saliva and blood contact of patients. To prevent cross-infection, impression materials should be disinfected at the end of the impression process in the mouth. Aim: To study the effect of application time of sodium hypochlorite and quaternary ammonium-based disinfectant solution on the surface roughness of an elastomeric impression material. Materials and Methods: In this in-vitro study done during March 2020, 10 disc-shaped samples were used in each group, with a total of 110 samples obtained from a light body elastomeric impression material with dimensions of 15×3 mm. The samples were kept in a sodium hypochlorite solution (Wizard; Rehber Kimya, Istanbul, Turkey) at concentrations of 1% and 5% for 1, 5, 10, and 30 minutes and in a quaternary ammonium-based disinfectant (Zeta 7 Solution, Zhermack SpA, Italy) for 10 and 30 minutes. Surface roughness measurements were taken with a profilometer device. The data obtained were statistically analysed by Kolmogorov-Smirnov test and Wilcoxon signed rank test for dependent/paired groups for the continuous data. The significance level was set to α=0.05. Results: A statistically significant difference was found between the control group and the 1% sodium hypochlorite (30 min p-value 0.037), and 5% sodium hypochlorite (30 min p-value 0.017). The statistical evaluation of the surface roughness of the samples with different concentrations of sodium hypochlorite and the same times was done and found statistically significant at 30 mins, p-value 0.021. Conclusion: The prolonged application of the sodium hypochlorite disinfectant at 1% and 5% concentrations caused a significant increase in the light body elastomeric impression material’s surface roughness

Determination of Surface Roughness and Accuracy of Alginate Impression Material Disinfected by Immersion

“…The specimens were weighed again after immersion. Change in percentage weight for each specimen in two different media was calculated.Figure (5).…”

“…It has been found that 67% of dental material forward from a dental clinic to the lab is contaminated (3) . Dental materials must be disinfected after making an impression (4,5) . Various disinfection protocols related to the type and method of disinfection have been proposed for alginate and dental cast (3) .…”

Disinfection efficacy of sodium hypochlorite and glutaraldehyde and their effects on the dimensional stability and surface properties of dental impressions: a systematic review

“…During the dental impression procedure, the dental impression materials come into contact with blood and saliva, which contain potentially pathogenic micro-organisms and some viruses ( Azevedo et al, 2019 ). Thus, in the absence of immediate disinfection, dental impressions contaminated with saliva or blood can serve as a source of cross infection between patients and dental care providers ( AlZain, 2019 ; Amin et al, 2009 ; Carvalhal et al, 2011 ; Drennon, Johnson & Powell, 1989 ; Guiraldo et al, 2018 ; Karaman, Oztekin & Tekin, 2020 ; Khatri et al, 2020 ; Lad et al, 2015 ; Shetty, Kamat & Shetty, 2013 ).…”

“…The dental impressions should possess the properties of keeping stable dimensions and reproducing tiny details of the dentition and its surrounding oral tissues, which are termed as dimensional stability and detail reproduction separately ( Guiraldo et al, 2017 ; Guiraldo et al, 2012 ). Meanwhile, it is of vital importance for dental impressions to keep their surface moist and smooth ( Karaman, Oztekin & Tekin, 2020 ; Lad et al, 2015 ). The surface properties of the dental impressions might be altered during impression disinfection procedures, deteriorating the surface properties of the corresponding casts ( Amin et al, 2009 ; Carvalhal et al, 2011 ).…”

“…The immediate disinfection of the dental impressions has been considered as a routine procedure in dental clinics and dental laboratories ( Hamedi Rad, Ghaffari & Safavi, 2010 ; Hiraguchi et al, 2012 ; Karaman, Oztekin & Tekin, 2020 ; Lepe et al, 2002 ; Shetty, Kamat & Shetty, 2013 ; Silva & Salvador, 2004 ; Thouati et al, 1996 ). As physical disinfections might result in temperature rise, which could cause measurable deformations in the molds ( Carvalhal et al, 2011 ; Silva & Salvador, 2004 ).…”