scholarly journals Dimensional Stability of Elastomeric Impression Material After Disinfection Via Immersion and Microwave Irradiation

2021 ◽  
Vol 15 (1) ◽  
pp. 658-663
Author(s):  
Noorhayati R. Mohd ◽  
Ros A. Omar ◽  
Enas A. Etajuri
Keyword(s):  
Microwave Irradiation ◽  
Dimensional Stability ◽  
Control Group ◽  
Clinical Settings ◽  
Image Analyzer ◽  
Impression Material ◽  
Average Percentage ◽  
Dimensional Changes ◽  
Impression Materials ◽  
Post Hoc

Aims: This study aimed to evaluate and compare the dimensional stability of two elastomeric impression materials, namely polyvinyl siloxane (PVS) and vinyl siloxanether (VSE), subjected to chemical immersion and microwave irradiation for disinfection. Materials and Methods: Sixty discs of PVS and VSE impression materials each were prepared using a stainless-steel test die and ring in accordance with ANSI/ADA Specification No. 19. Twenty discs of each impression material were disinfected by chemical immersion for 10 min; another 20 discs were subjected to dry microwave irradiation for 3 min. The other 20 discs served as a control group. Dimensional stability measurements were then performed using an image analyzer at 20× magnification. The data were analyzed by one-way analysis of variance (α=0.05) and Bonferroni (post hoc) test for multiple comparisons to detect significant differences between the groups. Results: When subjected to microwave irradiation, both PVS and VSE showed dimensional changes, but the changes were within the limit of 1.5% set by ANSI/ADA (P<0.00). VSE showed markedly better results than PVS for both disinfection methods. The immersion disinfection method resulted in a higher average percentage of linear dimensional changes than both the microwave irradiation and the control for VSE and PVS impression materials. Conclusion: VSE exhibited excellent dimensional stability than PVS under both chemical immersion and microwave irradiation. Microwave irradiation using conventional microwave ovens can be used in clinical settings as an alternative to other disinfection techniques because the dimensional changes of the elastomeric impression materials subjected to microwave irradiation have been observed to be within the clinically acceptable limit set by the ANSI/ADA standard.

scholarly journals Elastomeric Impression Materials: A Comparison of Accuracy of Multiple Pours

2011 ◽  
Vol 12 (4) ◽  
pp. 272-278 ◽  
Author(s):  
Dheeraj Kumar ◽  
Anand U Madihalli ◽  
K Rajeev Kumar Reddy ◽  
Namrataa Rastogi ◽  
NT Pradeep
Keyword(s):  
Clinical Significance ◽  
Dimensional Stability ◽  
Central Hole ◽  
Central Incisor ◽  
Impression Material ◽  
Maxillary Central Incisor ◽  
Dimensional Changes ◽  
The Third ◽  
Impression Materials ◽  
Time Periods

ABSTRACT Aim The aim of the present study is to compare the various elastomeric impression materials in terms of accuracy and dimensional stability, with respect to obtaining multiple casts from a single elastomeric impression at various times of pours. Materials and methods Three master dies were prepared for the impression making, two of these were made of brass containing a central hole with undercuts. The third die simulated a conventionally prepared typodont maxillary central incisor. Three elastomeric impression materials were chosen for the study. Each impression was poured at various time periods. Casts thus obtained were evaluated under a traveling microscope to evaluate various dimensional changes. Results Addition silicones provided dies which were shorter in height and bigger in diameter. Polyethers provided dies which were shorter in both height and diameter. Condensation silicones showed insignificant changes from the master die at the immediate pour but deteriorated rapidly after that in subsequent pours. Conclusion None of the impression material showed a consistent behavior up to the fourth pour. They occasionally showed deviation from the pattern, but all these values were statistically insignificant. Polyethers showed lesser ability than both the addition silicones as well as the condensation silicones to recover from induced deformation. Clinical significance Addition silicones as well as the condensation silicones have better ability to recover from induced deformation when compared to polyether. How to cite this article Kumar D, Madihalli AU, Reddy KRK, Rastogi N, Pradeep NT. Elastomeric Impression Materials: A Comparison of Accuracy of Multiple Pours. J Contemp Dent Pract 2011;12(4):272-278.

scholarly journals The Effects of Chemical Disinfection on Dimensional Stability among Different Type of Impression Addition Silicon Materials

2020 ◽  
Vol 5 (12) ◽  
pp. 645-649
Author(s):  
Salah A. Yousief ◽  
Khames T. Alzahrani ◽  
Suha M. Alhuwairini ◽  
Fai Y. Alharbi ◽  
Dalal A. Eissa ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Epoxy Resin ◽  
Dimensional Stability ◽  
Control Group ◽  
P Value ◽  
Impression Material ◽  
Dimensional Changes ◽  
The Mean ◽  
Master Model ◽  
The Cross

Introduction: Saliva and blood contaminated impressions are often a source of cross contamination between the clinic and dental laboratory. Explicit communication and observance of an infection control protocol for handling of dental impressions must exist among the office staff as well as between office and dental laboratories. Though disinfection of impression is routinely followed, autoclaving elastomeric impression is an effective method of sterilization them. Objectives: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. Methods: In this study, a total of twenty impressions for the master model using heat resistant plastic stock trays. The twenty impressions were divided into two groups according to disinfection technique: (Table 2) Group 1: (n=10) Control group, untreated impressions. (C.G) Group 2: (n=10) Impressions were chemically disinfected. (D.G). after all impressions treatment, they were poured with extra hard stone (type IV) to get stone casts. Dimensional accuracy and detail reproduction of the impression material were evaluated indirectly through the recovered improved stone casts from impressions of the master model using the travelling microscope. Results: Cross arch distance (A): Epoxy resin master model cross arch distance measurement (A) was (41.36 mm). 1.1 Measurements of the cross-arch distance of stone casts Control group (C.G): The mean and standard deviation values of distance (A) in stone models obtained from C.G. were 41.553 ± 0.170 mm. Disinfection group (D.G): The mean and standard deviation values of distance (A) in stone models obtained from D.G were 41.368 ± 0.083 mm. ANOVA test showed that there was a statistically difference shrinkage between the groups (P-value = 0.006). 1.2 Measurement of the dimensional changes in the cross-arch distance of the different groups. The mean and standard deviation values of cross arch distance changes in stone models of C.G. were 0.191 ± 0.170 mm. while dimensional changes in stone models obtained from D.G. were 0.006 ± 0.082 mm. Conclusion: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. In this study an epoxy resin master model was duplicated from a modified dentate mandibular model. Within the limitations of this study, it could be concluded that Chemical disinfectant of polyvinyl siloxane impression material can be successfully used in making fixed partial dentures.

scholarly journals The effect of disinfectants on dimensional stability of addition and condensation silicone impressions

2014 ◽  
Vol 71 (3) ◽  
pp. 251-258 ◽  
Author(s):  
Tamara Sinobad ◽  
Kosovka Obradovic-Djuricic ◽  
Zoran Nikolic ◽  
Slobodan Dodic ◽  
Vojkan Lazic ◽  
...  
Keyword(s):  
Dimensional Stability ◽  
Software Package ◽  
Control Group ◽  
Dimensional Changes ◽  
Impression Materials ◽  
Metal Ceramic ◽  
Disinfectant Solution ◽  
Stability And Accuracy ◽  
Ceramic Crown ◽  
Regular Body

Background/Aim. Dimensional stability and accuracy of an impression after chemical disinfection by immersion in disinfectants are crucial for the accuracy of final prosthetic restorations. The aim of this study was to assess the deformation of addition and condensation silicone impressions after disinfection in antimicrobial solutions. Methods. A total of 120 impressions were made on the model of the upper arch representing three full metal-ceramic crown preparations. Four impression materials were used: two condensation silicones (Oranwash L - Zhermack and Xantopren L Blue - Heraeus Kulzer) and two addition silicones (Elite H-D + regular body - Zhermack and Flexitime correct flow - Heraeus Kulzer). After removal from the model the impressions were immediately immersed in appropriate disinfectant (gluta-raldehyde, benzalkonium chloride - Sterigum and 5.25% NaOCl) for a period of 10 min. The control group consisted of samples that were not treated with disinfectant solution. Consecutive measurements of identical impressions were realized with a Canon G9 (12 megapixels, 2 fps, 6x/24x), and automated with a computer Asus Lamborghini VX-2R Intel C2D 2.4 GHz, by using Remote Capture software package, so that time-depending series of images of the same impression were obtained. Results. The dimensional changes of all the samples were significant both as a function of time and the applied disinfectant. The results show significant differences of the obtained dimensional changes between the group of condensation silicones and the group of addition silicones for the same time, and the same applied disinfectant (p = 0.026, F = 3.95). Conclusion. The greatest dimensional changes of addition and condensation silicone impressions appear in the first hour after their separation from the model.

THE EFFECT OF 25% BELT LEAVES AND 0.2% CHLORHEXIDINE AS DISINFECTANT MATERIALS ON THE DIMENSIONAL STABILITY OF ALGINATE MOLDS

2021 ◽  
Vol 17 (2) ◽  
pp. 103-109
Author(s):  
Ni Kadek Ari Astuti ◽  
◽  
Sumantri Sumantri ◽  
Iyan Anugrah Nasir ◽  
◽  
...  
Keyword(s):  
Dimensional Stability ◽  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Cross Infection ◽  
Control Group ◽  
Impression Material ◽  
Dimensional Changes ◽  
Betel Leaf ◽  
Post Test

ntroduction: Dental impression material is one of the agents of infection transmission in the dentist's work environment. Cross infection can occur through the interaction of microorganisms and impression material. To prevent cross infection, it is necessary to disinfect alginate impressions. One of the effective natural ingredients that can be used as a disinfectant is betel leaf. The effect of using disinfectant can affect the dimensional stability of the alginate mold. Purpose: This study aims to determine the effect of disin- fection by spraying a decoction of 25% betel leaf and 0.2% chlorhexidine on the dimensional stability of alginate molds. Materials and Methods: The research method used was an experimental laboratory with a post-test only control g roup design using 2 7 samples consisting of three treatments (negative control group, positive control group, and treatment group) which were measured using a digital caliper. The technique us ed in this study is the spraying technique on the sample with a st orage time of 10 minutes. Results and discussion: This 25% betel leaf de coction (infusion) can be used as an alternative to disinfecting alginate impressions because there is no difference in effect between spraying 25% betel leaf decoction (infusion) and 0.2% chlorhexidine on alginate molds on changes in model physiological dimen- sions. Conclusion: the dimensional changes that occur are still within tolera- ble limits in alginate molds which were disinfected by spraying 25% betel leaf decoction and 0.2% chlorhexidine solution so that both can be used as disinfection materials for alginate impression materials

scholarly journals A self-disinfecting irreversible hydrocolloid impression material mixed with povidone iodine powder

2016 ◽  
Vol 10 (04) ◽  
pp. 507-511 ◽  
Author(s):  
Hussien Abdalfatah Ismail ◽  
Hani Asfour ◽  
Souaad Abdulelah Shikho
Keyword(s):  
Dimensional Stability ◽  
Povidone Iodine ◽  
Antimicrobial Effect ◽  
Control Group ◽  
Impression Material ◽  
Irreversible Hydrocolloid ◽  
Weight Test ◽  
The Mean ◽  
And Staphylococcus Aureus ◽  
Stability Results

ABSTRACT Objectives: The aim was to evaluate the effect of adding povidone (PVP) iodine powder with different concentrations to irreversible hydrocolloid on both microbiological and dimensional stability. Materials and Methods: Regular set of (alginate) irreversible hydrocolloid was selected as control group. PVP-iodine powder was mixed with the alginate powder at concentrations of 1, 5, 10, 15, and 20% by weight (test groups). All specimens were tested for their antimicrobial effect against Streptococcus mutans and Staphylococcus aureus as well as dimensional stability. Results: The results of test groups showed that concentrations 1, 5, and 10, weight % had little effect against S. mutans and S. aureus microorganisms. While concentrations 15 and 20 weight % had demonstrated greater effect on microbial growth. The mean of dimensional stability in mm of modified alginate with PVP-iodine at 15 and 20 weight % was –0.119 ± 0.255 and –0.035 ± 0.074, respectively. While the mean dimensional stability in mm of unmodified alginate was –0.112 ± 0.176 . The results of dimensional stability showed that 15 and 20 concentrations of test groups adversely affect the dimensional stability. The adverse effect was noticed to be significant in concentration 20%, where as it was nonsignificant in 15% concentration. Conclusion: Modified alginate impression material with 15 weight % PVP-iodine powered give the material, a self-disinfected properties with less deteriorating effect on dimensional stability.

scholarly journals Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review

PRILOZI ◽  
2017 ◽  
Vol 38 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Borjan Naumovski ◽  
Biljana Kapushevska
Keyword(s):  
Literature Review ◽  
Dimensional Stability ◽  
Storage Time ◽  
Elastic Recovery ◽  
Impression Material ◽  
Impression Technique ◽  
Impression Materials ◽  
Scientific Papers ◽  
Materials Used ◽  
Stability And Accuracy

Abstract A quality-made dental impression is a prerequisite for successful fixed-prosthodontic fabrication and is directly dependent on the dimensional stability, accuracy and flexibility of the elastomeric impression materials, as well as on the appropriately used impression techniques. The purpose of this paper is to provide a literature review of relevant scientific papers which discuss the use of various silicone impression materials, different impression techniques and to evaluate their impact on the dimensional stability and accuracy of the obtained impressions. Scientific papers and studies were selected according to the materials used, the sample size, impression technique, storage time, type of measurements and use of spacer for the period between 2002 and 2016. In the reviewed literature several factors that influence the dimensional stability and accuracy of silicone impression molds, including the choice of the type of viscosity, impression material thickness, impression technique, retention of the impression material on the tray, storage time before the casting, number of castings, hydrophilicity of the material, release of byproducts, contraction after polymerization, thermal contraction and incomplete elastic recovery were presented. The literature review confirmed the lack of standardization of methodologies applied in the research and their great diversity. All findings point to the superiority of the addition silicone compared to the condensation silicone.

scholarly journals Evaluation of dimensional stability and details reproduction of alginate molds storage in different times and temperature

2018 ◽  
Vol 21 (1) ◽  
pp. 37 ◽  
Author(s):  
Rafael Da Rocha Santos Penfold ◽  
William Cunha Brandt ◽  
Milton Edson Miranda ◽  
Rafael Pino Vitti
Keyword(s):  
Dimensional Stability ◽  
Measurement Accuracy ◽  
Color Change ◽  
Control Group ◽  
Dimensional Measurement Accuracy ◽  
Impression Materials ◽  
Kolmogorov Smirnov ◽  
Dental Impression ◽  
Two Temperatures ◽  
And Control

<p><strong>Objective:</strong> The aim of this study was to evaluate dimensional stability and detail reproduction in alginate molds stored at different times and temperatures. <strong>Material and </strong><strong>Methods:</strong> Three different commercially available alginates (Cavex Color Change, Jeltrate Plus and Hydrogum 5) were tested at four different times (0 - control, 1, 3 and 5 days) and two temperatures (25ºC and 37ºC) (n=5). The alginates were handled following the manufacturer's instructions. The impression procedures occurred in an environment with controlled room temperature (25ºC) and relative humidity (50±5%). A metallic model (ISO 1563:1990) was used to perform the impressions. The tray containing alginate remained on the metallic model under constant pressure (2 kgf) until the alginate gelation process. The molds were stored (different times and temperatures) and analyzed in stereomicroscope at 30x magnification and 0.5 μm accuracy (Olympus Measuring Microscope STM). The molds and the metallic model measurements were compared, and the data were statistically analyzed by Kolmogorov-Smirnov and three-way ANOVA tests, and the means were compared by Tukey test (5%). <strong>Results:</strong> The results showed no double interactions (p&gt;0.05) and the different alginates presented statistically similar values of dimensional stability (p=0.102). However, 25ºC (temperature) and control group (time) showed the highest values of dimensional stability (p&lt;0.05). Jeltrate Plus was the only material that presented inaccuracy in details reproduction. <strong>Conclusion</strong>: It is recommended that, for tested alginates, the stone casts should be poured immediately, even though the molds are dimensionally stable up to 5 days when stored at 25ºC.</p><p><strong> </strong></p><p><strong>Keywords</strong></p><p>Dental impression materials; Dimensional measurement accuracy; Shrinkage.<strong></strong></p>

scholarly journals A Comparative Study on Accuracy and Reproducibility of Alginate and Addition Reaction Silicone as an Impression Materials.

2014 ◽  
Vol 3 (2) ◽  
pp. 28-33
Author(s):  
Shakila Fatema ◽  
Sheikh Md Shahriar Quader ◽  
Mohammad Shamsuzzaman ◽  
Mirza Md Arifur Rahman ◽  
Nasima Khan
Keyword(s):  
Addition Reaction ◽  
In Vitro Study ◽  
Dimensional Accuracy ◽  
Horizontal Line ◽  
Impression Material ◽  
Dimensional Changes ◽  
Impression Materials ◽  
Study Results ◽  
Surface Detail

Background: To achieve accuracy and exact reproduction of prosthesis, choosing a perfect impression material is essential. Especially to make the prosthesis as accurately as possible, impression material should possess some essential properties, like; minimum dimensional changes, good flow ability and easy removal. Purpose: The aim of this study was to evaluate the accuracy and surface detail reproduction of Alginate and Addition Reaction Silicone as an impression materials. Method: This is an experimental in vitro study. In this study Impression by Alginate and Addition Reaction Silicone were made using a round stainless steel test block with three horizontal lines and two vertical lines. The horizontal lines were used for evaluating the surface detail reproduction, and vertical lines were provided for the dimensional accuracy. For dimensional accuracy the length of the middle horizontal line in between vertical lines and the distance between the top and bottom horizontal line was measured using travelling microscope. And for surface detail reproduction three horizontal line of one segment were observed under stereomicroscope. Result: According to study results Addition Reaction Silicone is better than Alginate regarding quality of impression. Conclusion: In comparison to Alginate, Addition Reaction Silicone might have better performance about accuracy and surface detail reproduction. DOI: http://dx.doi.org/10.3329/updcj.v3i2.17996 Update Dent. Coll. j: 2013; 3 (2): 28-33

“EVALUATION OF SURFACE DETAIL REPRODUCTION OF BD IMPRESS AND NEXUS MEDODENT THERMOPLASTIC IMPRESSION MATERIALS” - AN IN VITRO COMPARATIVE STUDY

2021 ◽  
pp. 28-30
Author(s):  
Ajay Balaji ◽  
Naveen .B.H ◽  
Kalavthi. S.D ◽  
arun Thomas Philip
Keyword(s):  
Comparative Study ◽  
Dimensional Stability ◽  
P Value ◽  
Thermoplastic Material ◽  
Impression Material ◽  
Good Surface ◽  
Impression Materials ◽  
Surface Detail ◽  
Essential Prerequisite

Impression making is the primary step in the process of fabrication of prosthetic restoration. Dimensional stability, Surface detail reproduction, and compatibility with gypsum products is an essential prerequisite for a successful restoration. Clinically, the accuracy of impressions depends on two major aspects: 1) Ability to ow and adapt intimately to the relevant surfaces while making the impression, and 2) the wetting of the polymerized impression material by the gypsum. The purpose of this study is to evaluate and compare the surface detail reproduction of BD Impress and Nexus Medodent impression material. The results showed signicant difference in surface detail between the two thermoplastic impression materials with p-value <0.05. It was observed that comparison of mean scores obtained by BD Impress and Nexus Medodent impression material are 2.7556 and 2.2222 respectively. The materials with minimum mean score value is considered as the material with good surface detail reproduction. Thus one can conclude that Nexus Medodent thermoplastic material has the good surface detail reproduction compared to BD Impress thermoplastic material.

Volumetric Change as a Parameter for the Accuracy of Impression Materials

2018 ◽  
Vol 36 ◽  
pp. 17-23
Author(s):  
Mihaela Păpușa Vasiliu ◽  
Liliana Sachelarie ◽  
Carmen Stadoleanu ◽  
Cătălina Gîrbea ◽  
Agripina Zaharia
Keyword(s):  
Mechanical Strength ◽  
Dimensional Stability ◽  
Setting Time ◽  
Reproductive Capacity ◽  
Volumetric Change ◽  
Impression Material ◽  
Dental Prostheses ◽  
Impression Materials ◽  
Study Results

In this paper we studied the behavior of some impression materials such as alginate, condensation and addition silicones, considering the following parameters: the reproductive capacity of morphological details - dimensional stability - the ability to reproduce with accuracy the ratio between morphological elements. The essential conditions that an impression material should fulfill are plasticity, fidelity, flexibility, good mechanical strength, dimensional stability, suitable setting time and compatibility with materials from which the models are manufactured.The study results indicated that condensation silicones present the highest volumetric changes, their contraction being the result of the evaporation of volatile byproducts.The dimensional stability of fingerprint materials is one of the variables that contribute to the accuracy or inaccuracy of dental prostheses, other factors being represented by the changes occurring during the preparation of the fingerprint material as well as the fingerprinting techniques.

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