Comparative evaluation of the effect of chemical disinfectants and ultraviolet disinfection on dimensional stability of the polyvinyl siloxane impressions

Abstract

Context: Infection control is an important concept in the present day practice of dentistry. Disinfection of dental impressions is part of the daily routine in a dental clinics. After disinfection, it is important that impressions remain dimensionally stable. Aim: The purpose of this study was to compare the effect of chemical disinfectants and ultraviolet (UV) disinfection on the dimensional stability of the polyvinyl siloxane impressions. Objectives: The objective of the study is (1) To evaluate the effect of chemical disinfectant (2% glutaraldehyde and 1% sodium hypochlorite) and UV disinfectant on the dimensional stability of polyvinyl siloxane impression material. (2) Comparative evaluation of the dimensional discrepancy between the cast poured from the polyvinyl impressions material, that is subjected to chemical disinfectant and UV disinfectant to that of cast poured from impressions that were nondisinfected. Materials and Methods: A customized tray was fabricated to make impressions. Impressions were divided into four groups, 10 samples were disinfected with 2% glutaraldehyde for 20 min, 10 samples were disinfected with 1% sodium hypochlorite for 20 min, 10 samples were disinfected with UV light for 20 min, and 10 samples were not subjected to disinfection which served as control group. All the samples were poured after 30 min in die stone. Measurements were recorded using traveling microscope of 0.001 accuracy. Statistical analysis used in this study was the one-way ANOVA test. Results: The result showed significant dimensional changes in samples disinfected with 2% glutaraldehyde and 1% sodium hypochlorite, whereas samples disinfected with UV disinfectant unit showed no significant dimensional changes when compared with control group samples. Within the chemical groups, impressions disinfected with 1% sodium hypochlorite showed more discrepancy in the dimensions when compared to the 2% glutaraldehyde disinfected group. Conclusions: UV light disinfectant can be safely used to disinfect impressions as compared to chemical disinfectants in clinical prosthodontic procedures.

Disinfection of Impression Materials with Glutaraldehyde, Ultraviolet Radiation, and Autoclave: A Comparative Study

“…Nimonkar et al . [ 11 ] compared 1% sodium hypochlorite, 2% glutaraldehyde, and UV disinfectant on the dimensional stability of polyvinyl siloxane impression material. Samples disinfected with 2% glutaraldehyde and 1% sodium hypochlorite showed significant dimensional changes and UV disinfectant unit showed no significant dimensional changes.…”

Assessment of effect of different sterilization agents on dimensional accuracy of different impression materials in implant prosthesis – An In vitro study

“…The process of cross-infection control involves various stages such as identification of high-risk populations by judicious anamnesis and also use of a technical barrier consisting of masks, gloves, eyeglasses, and caps, both on the part of the professional and of his assistants; proper technique of disinfection and sterilization of instruments, other surfaces, and equipment with disinfectant solutions (2% glutaraldehyde, NaOCl, and quaternary ammonium compounds); and further sterilization in an oven or by autoclaving. [ 4 ]…”

Evaluation and Comparison of the Effectiveness of Physical Methods of Disinfection on Heat-Polymerized Polymethyl Methacrylate – An In-vitro Study

“…UV radiation has recently become an excellent method of inactivating microorganisms since it is efficient at killing microorganisms and bacterial spores while keeping the material's quality [17]. Against this backdrop, the experimental study was carried out to evaluate and compare the effectiveness of microwave irradiation and UV radiation on the disinfection of heat-polymerized polymethyl methacrylate (PMMA).…”