Surface Quality and Long-term Dimensional Stability of Current Elastomeric Impression Materials after Disinfection (original) (raw)
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Dental Materials Journal, 2018
The aim of this study was to determine and compare the dimensional changes of polyether and vinyl polyether siloxane impression materials under immersion disinfection with two different disinfectants in three time periods. Impressions were obtained from an edentulous master model. Sodium hypochlorite (5.25%) and glutaraldehyde (2%) were used for disinfection and measurements were done 30 min later after making impression before disinfection, after required disinfection period (10 min), and after 24 h storage at room temperature. Impressions were scanned using 3D scanner with 10 microns accuracy and 3D software was used to evaluate the dimensional changes with superimpositioning. Positive and negative deviations were calculated and compared with master model. There was no significant difference between two elastomeric impression materials (p>0.05). It was concluded that dimensional accuracy and stability of two impression materials were excellent and similar.
Surface properties of elastomeric impression materials
Journal of Dentistry, 1993
This study investigated the wettability of commonly used elastomeric impression materials and their gypsum castability. The wettability was evaluated by determining the contact angles of drops of a CaSO, aqueous solution on flat impression surfaces. Gypsum castability was determined by counting the number of voids formed in die stone casts made from impressions of a critical die. All specimens used in this study were exposed to saliva to simulate clinical conditions, where materials spontaneously acquire salivary origin biotilms. The results indicate that the condensation silicones and conventional addition silicones exhibited the largest contact angles and the highest number of voids. The new generation of 'hydrophilic' addition silicones had higher wettability than the conventional silicones and an improved gypsum castability, comparable to that of the polyether materials.
Dimensional stability of seven elastomeric impression materials immersed in disinfectants
The Journal of Prosthetic Dentistry, 1996
Dental impressions can increase the transmission of microorganisms and infections. The purpose of this study was to assess the influence of three disinfectant solutions on the dimensional accuracy of seven elastomeric impression materials. Impressions of a test block were either left untreated (controls) or treated by immersion in a disinfectant solution. Measurements were taken on die stone replicas of the impressions. Comparisons were made between (1) the measurements for the variations in the nontreated impressions and those for the treated impressions and (2) measurements for the treated impressions and the test block. Results indicated that the aminoamphoteric agent or glutaraldehyde derivative-based solutions created little change in relation to the initial dimensional accuracy of the impression products. However, the sodium hypochlorite solution often leads to expansion by comparison with controls. By comparison to the test block, this expansion then makes it possible in most cases to obtain better dimensional accuracy than initially. Within the limits of this study this expansion could lead to an improvement in clinical fixed prosthodontic procedures. (J
Journal of international oral health : JIOH, 2015
This study was carried out to evaluate the effect of two commercially available chemical disinfectants namely sodium hypochlorite and glutaraldehyde and a surface wetting agent on the wettability of three high precision elastomeric impression materials, addition silicone, condensation silicone and polyether. Three different types of elastomeric impression materials commonly used in prosthodontic practice were selected. The glutaraldehyde and sodium hypochloride solutions were employed to disinfect the impressions made with the above-mentioned elastomeric impression materials. True Blue surface wetting agent was selected. GBX contact angle analyzer was used to measure advancing and receding contact angle. The results of this study have demonstrated that the polyether impression material was the most hydrophilic of all the materials, followed by hydrophilic addition silicone. Condensation silicone was least hydrophilic. All materials showed improvement in the wettability when a topica...
Influence of chloramine-T disinfection on elastomeric impression stability
European journal of dentistry
The aim of this study was to evaluate the stability of elastomer through detail reproduction and its dimensional stability (DS) after disinfection with 0.2% chloramine-T. The elastomeric impression dental materials used in this study were polydimethylsiloxane (Oranwash L), polyvinyl siloxane (Express), polysulfide (Permlastic), and polyether (Impregum Soft). The entire press procedure was performed on a matrix in accordance with the ISO 4823. Detail reproduction was analyzed using an optical microscope (Stereozoom Microscope) over the 20-μm line with 25 mm of length at a magnification of ×4. DS was measured using an optical microscope (Scanning Tunneling Microscope) by subtracting the distance between the lines X and X' over the 20-μm line on the matrix (DM) from the distance between the lines on the impression material (DI) divided by DM and multiplied by 100 establishing the equation: DS = ([DI - DM]/DM) ×100; then, 100% was added to the results of the equation. The detail rep...
IP innovative publication pvt. ltd, 2019
Introduction: Infection control is an important concept in the present day practice of dentistry. Elastomeric dental impressions too should be disinfected as per laid down protocols. Recently, vinylsiloxaether type of elastomeric impression material have been introduced which is supposed to have improved hydrophilic properties among others. This invitro study was taken up to compare wettability of vinylsiloxaether impression material in comparison to two other popular traditional elastomeric impression materials i.e polyether and addition silicone. Materials and Methods: An in-vitro study was undertaken to evaluate effect of four recommended commercially available disinfectant solutions on the wettability of three types of elastomeric impression materials at 10 and 30 minutes time intervals. The impression materials evaluated were vinylsiloxaether, addition silicone and polyether. The disinfectants used were 2% glutaraldehyde, 0.5% sodium hypochlorite, 0.05% iodophor and 0.25% benzalkonium chloride. 100 samples of each impression material was made and subjected to 10 different immersion protocols including distill water as control. The surface wettability (contact angle) of all samples was measured using the contact angle analyzer (Digidrop, Contact angle meter, GBX products, France). The data obtained was statistically analyzed. 'Two-sample t-tests', 'two-way-ANOVA' and 'tukey simultaneous test' was applied. Results: The mean contact angle values of addition silicone samples were highest among elastomers followed by polyether and vinylsiloxaether samples. The mean value of contact angles for 30 minutes immersion time interval was highly significant compared to the corresponding values of 10 minutes immersion time interval (P< 0.0001). In each case, the mean contact angles were higher for 30 minutes immersion time interval. Conclusion: Among the elastomeric impression materials evaluated, wettability wise vinylsiloxaether proved to be the best impression material followed by polyether and addition silicone. Disinfection with 2% glutaraldehyde had shown lowest contact angle values followed by 0.5% sodium hypochlorite solution, 0.25% benzalkonium chloride and 0.05% iodophor respectively.
International Journal of Health Sciences (IJHS), 2022
To evaluate the dimensional changes after disinfection of elastomeric impression materials with Ozone water, sodium hypochlorite, and autoclave method. A total of 40 impressions were made and divided into 4 groups according to type of sterilization method used (Group 1: Control without use of disinfectant, Group 2: Autoclave, Group 3: sodium hypochlorite, Group 4: ozone water method) with 10 in each group. Impression materials in each group were contaminated with Pseudomonas aeruginosa and poured with 4495 dental stone and subjected for different disinfection procedure. Microbial evaluation was done by the cultural method and dimensional stability for accuracy. Results were statistically evaluated. The Significant difference was seen in microbial load with sodium hypochlorite and autoclave method followed by ozone water compared to control group (P < 0.001). Autoclave and ozone water methods are effective in reducing microbial count and can be used as an effective disinfectant method.
International Journal Of Community Medicine And Public Health
Background: Infection control has been an important parameter in day-to-day dental practice is infection control. But sometimes while the execution of treatment, during impression making an unforeseen complication may arise due lack of proper disinfection protocol which might lead to transfer of infection between patient to other personnel. The purpose of this study is to evaluate and compare the effect of autoclave and chemical sterilization on the dimensional accuracy and stability of two elastomeric impression materials.Methods: A total of 40 impressions were made with a special impression making device with 2 types of elastomeric impression materials polyvinyl siloxane and polyether. The samples were divided into 2 groups, group 1 was chemically disinfected, whereas group 2 was autoclaved of each material respectively. Measurements were made immediately after the impression is made. Immediately after sterilization and 7 days (168 hours) after sterilization.Results: the dimension...
JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH, 2016
Several decades have passed since dental impression disinfection has been integrated in modern dentistry as a way to prevent cross-infection to the dental team [1-8]. Various studies have shown that handling contaminated dental impressions can lead to infections, as well as the stone casts that are poured from them [7,9,10]. Although most of the microorganisms adhered to the dental impression surfaces are removed by rinsing under running tap water, a high percentage still remains [11,12].