scholarly journals Making of Alginate Dental Impression Material from Sargassum duplicatum

2020 ◽  
Vol 147 ◽  
pp. 03015
Author(s):  
Ellya Sinurat ◽  
Subaryono ◽  
Anantaria Okawati Rambe
Keyword(s):  
Calcium Sulfate ◽  
Room Temperature ◽  
Setting Time ◽  
Quality Parameters ◽  
Gel Strength ◽  
Impression Material ◽  
Final Setting Time ◽  
Impression Materials ◽  
Dental Impression ◽  
Time Variations

This study was aimed to prepare dental impression material from Sargassum duplicatum taken from Binuangeun, Banten. The setting time was tested according to ANSI/ADA Specification for Alginate Impression Materials 1983. After extraction, obtained the alginate powder then mixed its water/powder ratio from the combination of alginate composition and tested final setting time. Variations of the formulations used different calcium sulfate (0,1 g; 0,2 g; and 0,3 g). Product quality parameters are lumps, solubility, consistency, flow, tearing, setting time. The alginate yield obtained from Sargassum duplicatum by 31 % with characteristic gel strength by 816 (gr/cm2); viscosity 238 mPas (2%; room temperature). The highest ratio is the best ratio by adding calcium sulfate powder of 0.1 gram with a setting time of 3 minutes.

The use of vinyl polysiloxanes and quick setting epoxies in paleontology

1989 ◽  
Vol 63 (2) ◽  
pp. 256-256 ◽  
Author(s):  
Patrick Leiggi
Keyword(s):  
Fast Method ◽  
Impression Material ◽  
Impression Materials ◽  
Dental Impression

Quick setting dental impression materials are nothing new in the paleontology laboratory. In a paleontological note published in the Journal of Paleontology on “The Use of Dental Impression Material For Molding Macrofossils” (Quilty & Williams, 1975), the products Xantopren and Optosil were introduced as a simple and fast method of obtaining precision molds in 1-3 minutes. Since the mid-1970's these products have been replaced by vinyl polysiloxanes.

A Replica Method for the Study of Marine Biofilms

1995 ◽  
Vol 75 (3) ◽  
pp. 759-762 ◽  
Author(s):  
S. J. Marrs ◽  
J. C. Thomason ◽  
M. J. Cowling ◽  
T. Hodgkiess
Keyword(s):  
Materials Science ◽  
Plant Morphology ◽  
Replica Method ◽  
Impression Material ◽  
Large Size ◽  
Impression Materials ◽  
Marine Biofilms ◽  
Dental Impression ◽  
Non Destructive ◽  
Standard Techniques

A replica method involving the use of a polyvinylsiloxane impression material with a resin cast, particularly suitable in the study of marine biofilms, is described. The technique has advantages over other methods in that it is quick, non-toxic, non-destructive and inexpensive. Replicas of critical-point dried eggcases of the dogfishScyliorhinus canicula(L.) (Elasmobranchii: Squaliformes) showed the replica to be true down to the size of bacteria. It was also possible to replicate larger areas such as patches of living barnacles on an intertidal rock.The study of marine biofilms often involves the use of destructive techniques such as conventional scanning electron microscopy (SEM), histology andin vacuospectroscopic methods (Baier & Meyer, 1986), so a single surface may not be examined repeatedly. Alternatively, the surface of interest may not be amenable to examination by standard techniques due to, for example, large size or incompatibility of the material of interest. In materials science the use of replica techniques to overcome such problems have been common (Goodhew, 1973), though techniques commonly involve the use of solvents (Loh, 1989) or silicone elastomers that may have a curing period of several hours (Gordon, 1984) and are consequently unsuitable for the study of biofilms. Scott (1982) reviewed the use of dental impression materials for field use in metallurgy and in recent years, dental impression materials have been used in the study of plant morphology (Green & Linstead, 1990). In this paper we consider the use of a hydrophilic polyvinylsiloxane impression material in the study of both microscopic and macroscopic marine biofilms.

Improved Stones for the Construction of Models and Dies

1971 ◽  
Vol 50 (4) ◽  
pp. 897-901 ◽  
Author(s):  
E.C. Combe ◽  
D.C. Smith
Keyword(s):  
Setting Time ◽  
Impression Materials ◽  
Die Materials ◽  
Dental Impression

By the incorporation of lignosulfonates in a dental stone, with other salts when necessary to control the setting time or expansion or both, it has been possible to produce superior model and die materials that are also compatible with dental impression materials.

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.

scholarly journals Comparison of double-phase impression technique in 1 step and 2 steps by evaluating dimensional stability and accuracy of condensation silicones

2018 ◽  
Vol 63 (01) ◽  
pp. 55-61
Author(s):  
Borjan Naumovski ◽  
Jadranka Bundevska ◽  
Biljana Kapusevska
Keyword(s):  
Dimensional Stability ◽  
Impression Material ◽  
Impression Technique ◽  
Impression Materials ◽  
Double Phase ◽  
Dental Impression ◽  
Master Model ◽  
Stability And Accuracy ◽  
Plaster Model ◽  
Selection Of

The diverse viscosities of silicone impression materials are suited for their use in various impression techniques, intended to improve the precision of the cast impression in the form of a plaster model. The purpose of this research is to determine the dimensional stability and accuracy of the double-phase impression technique in 1 step and 2 steps by using a condensation silicone impression material. This research was carried out by using a precise stainless-steel master model and an individual aluminum tray. Comparing the abutments of the master model and the abutments of the double-phase impression technique in 2 steps, showed that they are wider on average 81 µm, while the abutments from the double-phase impression technique in 1 step are on average 281 µm wider in diameter. After analyzing the results obtained in relation to the diameter of the abutments, it can be concluded that the double-phase impression technique in 2 steps is dimensionally more stable and accurate compared to the double-phase impression technique in 1 step. This study shows that dimensional stability and accuracy of impression materials also depend on the selection of appropriate impression technique and proper performance in order to obtain a high quality dental impression that will be the basis for an accurate fixed-prosthodontic fabrication. Keywords: silicone impression material, impression technique, fixed partial dentures, dimensional stability and accuracy

scholarly journals A Comparative Study to Determine the Wettability and Castability of Different Elastomeric Impression Materials

2012 ◽  
Vol 13 (3) ◽  
pp. 356-363 ◽  
Author(s):  
N Simhachalam Reddy ◽  
G Vivekananda Reddy ◽  
Jayaprkash Itttigi
Keyword(s):  
Contact Angle ◽  
Comparative Study ◽  
Calcium Sulfate ◽  
Clinical Importance ◽  
Contact Angles ◽  
Impression Material ◽  
Calcium Sulfate Dihydrate ◽  
Impression Materials ◽  
Removable Prosthesis ◽  
Hydrophobic Nature

ABSTRACT Aim The aim of this study was to determine the wettability of different hydrophilic and hydrophobic elastomeric impression materials and the gypsum castability. Materials and methods The wettability was evaluated by determining the contact angles of different elastomeric impression materials. The contact angle was determined by placing a drop of aqueous solution of calcium sulfate dihydrate on the flat surface of impression material and specimens were measured using a profile projector. Gypsum castability was determined by counting the number of voids formed in the die stone cast made from the impressions of a aluminum die. The voids were counted using an diopter magnifying lens. Results Polyether, different viscosities of polyvinyl siloxane, and condensation silicone impression materials exhibited low contact angle values and least number of voids in the die stone cast when compared with polysulfide impression material. Conclusion There was significant correlation between the contact angle and voids formed in the die stone casts when fabricating die stone casts from various elastomeric impression material impressions. Clinical significance Accurate reproduction of prepared tooth or edentulous arch is of clinical importance in the fabrication of a fixed or removable prosthesis. Inaccuracies in the replication processes will ultimately have an adverse effect on the fit and adaptation of final restoration. The interaction is determined in part by hydrophilic and hydrophobic nature of the elastomeric impression material. Inadequate wetting of an impression results in voids in the stone casts. How to cite this article Reddy GV, Reddy NS, Itttigi J, Jagadeesh KN. A Comparative Study to Determine the Wettability and Castability of Different Elastomeric Impression Materials. J Contemp Dent Pract 2012;13(3):356-363.

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