scholarly journals Impression Materials and Storage Time Influence on Cast Models Accuracy

2013 ◽  
Vol 2 (1) ◽  
pp. 18-23 ◽  
Author(s):  
Daniela Araújo Veloso Popoff ◽  
Fabiana Santos Gonçalves ◽  
Wallace de Freitas Oliveira ◽  
Luiza Anjos Soares ◽  
Hugo Lemes Carlo ◽  
...  
Keyword(s):  
Storage Time ◽  
Dimensional Accuracy ◽  
Biological Properties ◽  
Reference Points ◽  
Human Teeth ◽  
Type Iv ◽  
Fixed Prosthodontics ◽  
Impression Materials ◽  
Elastomeric Materials ◽  
And Storage

ABSTRACT Background There are a great amount of materials and techniques to use during dental prosthesis production that may confuse the dentist at the time of choice. Material's choice should be done considering ideal chemicophysical and biological properties and high detail reproduction. Aims The present study aimed to test the influence of differents impression materials and storage times on the dimensional accuracy of casting models. Materials and methods Four elastomeric materials– polysulfide, polyether, condensation silicone and addition silicone–were used to reproduce a master model of human teeth which were prepared for metaloceramic fixed prosthodontics. Six reference points were established on each tooth in order to determine four intervals: MD–mesial-distal, BL–buccal-lingual and CO–cervical-occlusal distance from premolar, and INT– interpillar distance–from the distal surface of the premolar to the mesial surface of the molar. The impressions were stored for half, 2 and 12 hours and pondered with a type IV gypsum. Results Cast measurements data were subjected to ANOVA (4 × 3), Tukey's – α = 0.05, Kruskal-Wallis and Dunn's tests – α = 0.05. The interaction between materials and storage time presented statistically significant for VP and CO intervals. For each storage time, materials presented dimensional alteration statistically significant. Conclusion Impression materials accuracy was affected by the storage time. All materials presented different dimensional accuracy when evaluated in a same period of time. Polysulfide was the only material that presented stable behavior over the time. How to cite this article Gonçalves FS, de Freitas Oliveira W, Soares LA, Carlo HL, da Mota AS, Popoff DAV, Soares CJ. Impression Materials and Storage Time Influence on Cast Models Accuracy. Int J Experiment Dent Sci 2013;2(1):18-23.

scholarly journals Dimensional Stability and Surface Details Reproduction of Two Extended-Pour Alginate Materials: A Function of Chemical Disinfection and Storage Time. An In- Vitro Study

2020 ◽  
Author(s):  
Rania A. Sharif ◽  
Khalid M. Abdelaziz ◽  
Najla Manis Zafer Alshahrani ◽  
Fatimah Salem Almutairi ◽  
Mohrah Awadh Saeed Alaseri ◽  
...  
Keyword(s):  
Dimensional Stability ◽  
Storage Time ◽  
In Vitro Study ◽  
Dimensional Accuracy ◽  
Disinfection Methods ◽  
Type Iv ◽  
Impression Materials ◽  
And Storage ◽  
Chemical Disinfection

Abstract Background: Many new extended-pour irreversible hydrocolloid impression materials have been marketed with claims that they demonstrate enhanced surface details accuracy and dimensional stability for up to 120 hours of storage. However, no data in the literature about the effect of storage time on surface details and dimensional stability of extended-pour impression materials upon disinfection. In this study we aimed to evaluate the effect of two chemical disinfection methods and three storage times on dimensional stability and surface details reproduction of 2 extended-pour alginates in comparison with a conventional one.Methods: A total of 243 alginate impressions were recorded from a custom metal die using Tropicalgin (conventional), Hydrogum5 and Chroma print (extended-pour) alginates. Impressions were categorized into 9 groups according to disinfection method (non-disinfected, sprayed or immersed) and storage time (0, 72, 120 hours). After storage in sealed plastic bag with a damp cotton roll, all impressions were poured with type IV dental stone. The stone models were then examined for surface details and dimensions using a magnifier (×10) and digital caliper to assess whether a 25 µm-line on the metal die was completely reproduced over the full 25 mm length and its dimensions compared to the original die. Data were analyzed using one-way (ANOVA) and Tuckey’s post-hoc test, and KrusKal Wallis test and Mann-Whitney's test.Results: With immediate pouring all alginates showed accurate surface details regardless of the disinfection condition, except for immersed Tropicalgin (P<0.05). The extended storage affected surface details of all materials. After 72h, only non-disinfected extended-pour alginates showed dimensional stability. However, after 120h of storage all materials regained dimensional stability except sprayed Tropicalgin.ConclusionsExtended-pour alginates hardly proved to be more advantageous than traditional alginate in terms of surface details accuracy. Disinfection methods had some adverse effects on surface details and dimensional accuracy of both extended-pour and conventional alginate. Extended-pour alginate proved dimensional stability after 120h. It is recommended to immediately pour all alginates whether conventional or extended-pour. Further studies are needed to evaluate impression materials directly to control the confounding variable like gypsum expansion and storage environment in terms of humidity and temperature.

scholarly journals Accuracy of partially edentulous arch impressions obtained from different alginates and storage times

2017 ◽  
Vol 15 (4) ◽  
pp. 252
Author(s):  
Marcus Vinicius Loureiro Bertolo ◽  
Lucas de Oliveira Tomaselli ◽  
Rafael Pino Vitti ◽  
Gabriel Abuna ◽  
William Cunha Brandt ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Dimensional Accuracy ◽  
Reference Points ◽  
Mandibular Arch ◽  
Steel Cast ◽  
Storage Times ◽  
And Storage

This study aimed to assess the dimensional accuracy of five commercial alginates verified in stone casts. Methods: Each alginate impression (Cavex ColorChange, Cavex Holland BV; Jeltrate Plus, Dentsply; Hydrogum, Zhermack; Kromopan 100, Lascod; Ezact Kromm, Vigodent) was performed on partially edentulous standard stainless steel mandibular arch cast with reference points on teeth 33, 43, 37 and 47. On the stainless steel cast, the anteroposterior (33-37 and 43-47) and transverse (33-43 and 37-47) distances were measured in a stereomicroscope at 30x magnification and 0.5 μm accuracy. The distances between these points were measured three times, obtaining an average, which was analyzed statistically and compared with the distances obtained from the stone casts. For each alginate the casts were poured gypsum (n = 5) immediately and after a period of 1, 2, 3 and 5 days of the impression procedure. Results: The dimensional accuracy values of stone and stainless steel casts were analyzed statistically by two-way ANOVA and Tukey's test (α=0.05). The results showed significant differences between the alginates; however, no differences in dimensional accuracy were found among the different storage times of alginate impression. Conclusions: It can be concluded that the alginate impressions can be stored for up to 5 days.

Two- and three-dimensional accuracy of dental impression materials: Effects of storage time and moisture contamination

2010 ◽  
Vol 20 (5) ◽  
pp. 243-249 ◽  
Author(s):  
Deepa T. Chandran ◽  
Daryll C. Jagger ◽  
Robert G. Jagger ◽  
Michele E. Barbour
Keyword(s):  
Storage Time ◽  
Three Dimensional ◽  
Dimensional Accuracy ◽  
Impression Materials ◽  
Dental Impression

scholarly journals Dimensional Accuracy of Multiple Pour Cast from Different Elastomer Impression Techniques

2016 ◽  
Vol 6 (3) ◽  
pp. 51-56
Author(s):  
Satheesh B Haralur ◽  
Majed S Toman ◽  
Abdullah A Al-Shahrani ◽  
Abdullah A Al-Qarni
Keyword(s):  
Dimensional Accuracy ◽  
Dental Practice ◽  
Variance Test ◽  
Impression Material ◽  
Significance Level ◽  
Type Iv ◽  
Impression Materials ◽  
Cast Model ◽  
One Step ◽  
Step Type

ABSTRACT Context The elastomeric impression material is the most widely used impression material in contemporary dental practice; their accuracy is critical for the outcome of indirect restorations. The accurate duplicate cast obtained from single impression reduces the professional clinical time, patient inconvenience, and extra material cost. Aim To compare the accuracy of the cast obtained from various impression methods utilizing elastomer impression materials. Materials and methods The stainless steel working cast model assembly consisting of two abutments and one pontic area was fabricated. Two sets of six each custom aluminum trays were fabricated, with 5 mm spacer and 2 mm space. The impression methods evaluated in the study were additional silicone putty reline (two step), heavy-light body (one step), monophase (one step), and polyether (one step). Type IV gypsum casts were poured at intervals of 1, 12, 24, and 48 hours. The resultant cast was measured with a traveling microscope for comparative dimensional accuracy. The data obtained were subjected to analysis of variance test at significance level <0.05. Results The die obtained from putty reline two-step impression techniques had the percentage of variation for the height -0.36 to -0.97% with 0.40 to 0.90% increase in diameter. One-step heavy-light body impression dies recorded the increased width by 0.50 to 0.80% and height reduced by - 0.73 to -1.21%. The resultant dies from additional silicone monophase impressions had a percentage of variation for width 1.20% and height by-1.34%. The similar value for width and height for polyether was -1.46% and -1.30% respectively. Conclusion Putty reline technique dies had better dimensional accuracy after repeated pour followed by dies from heavy-light body additional silicone impression. Key message The multiple pour cast from putty reline elastomeric impressions is clinically acceptable, while cast from polyether was smaller in dimension. How to cite this article Haralur SB, Toman MS, Al-Shahrani AA, Al-Qarni AA. Dimensional Accuracy of Multiple Pour Cast from Different Elastomer Impression Techniques. Int J Prosthodont Restor Dent 2016;6(3):51-56.

scholarly journals Dimensional Accuracy of Stone Casts Made from Silicone-Based Impression Materials and Three Impression Techniques

2013 ◽  
Vol 24 (5) ◽  
pp. 498-502 ◽  
Author(s):  
Rafael Pino Vitti ◽  
Marcos Aurélio Bomfim da Silva ◽  
Rafael Leonardo Xediek Consani ◽  
Mário Alexandre Coelho Sinhoreti
Keyword(s):  
Stainless Steel ◽  
Dimensional Accuracy ◽  
Reference Points ◽  
Second Molar ◽  
Mandibular Arch ◽  
Impression Materials ◽  
Steel Cast ◽  
Left And Right

The aim of this study was to measure and compare the dimensional accuracy of stone casts of a partially edentulous mandibular arch made by two condensation silicones, two addition silicones and three impression techniques (1-step putty/light-body, 2-step putty/light-body and monophase technique). A partially edentulous standard stainless steel mandibular arch cast was obtained with reference points on the permanent mandibular right and left canines, and permanent mandibular right and left second molars. The anteroposterior distances (between the mandibular left canine and second molar and between the mandibular right canine and second molar) and transverse distances (between the mandibular left and right canines and between the mandibular left and right second molars) of stainless steel cast were measured by a microscope at 30× magnification and 0.5 µm accuracy. All impressions were made with condensation or addition silicones. The 1- and 2-step putty/light-body impressions were accomplished with putty and light-body materials and the monophase impressions with light-body material only. After the impression procedures, accuracy of each material and technique was assessed measuring the stone casts poured (n=5) from the impressions, by the same microscope. The differences between the values of stone cast and stainless steel cast were calculated, presented as percentages and analyzed statistically by two-way ANOVA and the means compared by Tukey's test (α=0.05). All distances measured on stone casts showed altered dimensions with significantly negative linear changes (shrinkage) as compared to those of the stainless steel cast. The stone casts made from the addition silicones were dimensionally more accurate. No differences were found among the impression techniques.

To Evaluate the Effect of Storage Temperature on the Linear Dimensional Accuracy of Delayed and Repeat Pours of Two Addition Silicone Impression Materials

2019 ◽  
pp. 1-20
Author(s):  
Manish Sen Kinra
Keyword(s):  
Storage Temperature ◽  
Dimensional Accuracy ◽  
Clinical Situation ◽  
Impression Material ◽  
Type Iv ◽  
Impression Materials ◽  
Group I ◽  
Different Types ◽  
Significant Change ◽  
Standard Steel

Background: Addition silicone elastomers are the most commonly used impression materials for making final impression for fpd, implants and rpd. The dimensional stability and accuracy of addition silicone impression material are influenced by the storage time, temperature and repeat pour. Aim and Objectives: To evaluate the accuracy of two different types of addition silicone elastomeric impression materials, stored at a different temperature. To evaluate the accuracy of two different types of addition silicone elastomeric impression materials, after delayed and repeated pour. To compare the linear dimensions of two different types of addition silicone elastomeric impression materials with a control die. Materials and Methods: A machined standard steel master die and metal custom impression tray was made for making a final impression of machined standard steel master die. Final impression was made by using two different brands of addition silicone impression materials (Aquasil Ultra Impression material, Dentsply/ Caulk, Milford, D & 3M ESPE). Double step putty light body impression technique was used for making final impression. In this manner total numbers of 80 impressions were made and they were divided into two groups Group I and Group II. To study the effect of delayed pours and storage temperature were divided into 4 sub-groups, 10 impressions each. All the ten impressions of each sub groups were stored at 40°C in acrylizer, 24 hours at -10°C, 48 hours at -2°C and 1 week respectively at 0°C inside a refrigerator in a sealed plastic bags before been poured with type IV die stone. To study the effect of repeat pours on the accuracy of stone casts, all ten impressions of each sub groups was immediately re poured with type IV die stone after the removal of first set of casts. Thus again a fresh set of 80 cats were obtained having 40 casts belongs to each group. Results: When impressions were stored at 40°C in acrylizer, 24 hours at -10°C, 48 hours at -2°C and 1 week respectively at 0°C addition silicone impression materials did not show any significant change when compared to control samples. Conclusion: Both types of addition silicone elastomeric impression materials maintained their accuracy after delayed poured and repeat pours. Storing impressions under different conditions caused no adverse effect upon the accuracy of both types of addition silicone elastomeric impression materials. There was no significant change in the dimensions of stone casts obtained from both impression materials as compared to the dimensions of a master die. If addition silicone impression material is delayed pour up to 1 week, repeat pour and exposed from -10°C to 40°C in that clinical situation also linear dimensional accuracy will not be adversely effected.

scholarly journals Pengaruh teknik pencampuran bahan cetak alginat terhadap stabilitas dimensi linier model stone dari hasil cetakan Effect of mixing methods of alginate impression material on liniear dimensional stability of stone cast

2012 ◽  
Vol 11 (3) ◽  
pp. 142
Author(s):  
Elizabeth Mailoa ◽  
M. Dharmautama ◽  
Peter Rovani
Keyword(s):  
Study Data ◽  
Reference Points ◽  
Impression Material ◽  
Second Molar ◽  
Type Iv ◽  
Impression Materials ◽  
Left And Right ◽  
Level Of Significance ◽  
Mixing Techniques ◽  
Parameters Measurement

The aim of this study was to evaluate the influence of mixing technique of dental impression materials to lineardimension stability on stone cast. Fifteen stone cast formed of pouring alginat impression material (Hydrogum 5,Zhermack) obtained from maxillary typodont (Frasaco, Italy) as master model containing four metal pillars in squarelocated in area of second premolar teeth (left and right), and two in the second molar area (left and right). Mixingtechniques were done manually and mechanically (full dan semi automatic) and by pouring with dental stone type IV(Prostone-21, BMP Formula). The results are depicted of 5 models for each mixing techniques. Measurements weremade in four parameters (ac, bd, a1b1 and c1d1) of 8 reference points on metal pillars. For this study data wasanalyzed using one-way Anova statistical test with level of significance at p <0.05 and processed with SPSS v.17. Ofthe four parameters measurement on each model, there was statistically significant processed differences of 3parameters (ac, a1b1 and c1d1), whereas one parameter (bd) had no statistically significant differences (p = 0.375). Itwas concluded that the mixing technique of fully automatic mixer shows better results in terms of dimensional stabilitycompared to the manual mixing technique and semi automatic mixer.

Synthesis, Characterization and Thermal Degradation of Some New 3,5-dimethyl Pyrazole Derivatives

2017 ◽  
Vol 68 (2) ◽  
pp. 317-322
Author(s):  
Anca Mihaela Mocanu ◽  
Constantin Luca ◽  
Alina Costina Luca
Keyword(s):  
Thermal Degradation ◽  
Degradation Mechanism ◽  
New Products ◽  
Analysis Data ◽  
Biological Properties ◽  
Elemental Analysis Data ◽  
Ftir Analysis ◽  
Spectral Measurements ◽  
Chemical Structures ◽  
And Storage

The purpose of this research is to synthetize, characterize and thermal degradation of new heterolytic derivates with potential biological properties. The derivates synthesis was done by obtaining new molecules with pyralozone structure which combine two pharmacophore entities: the amidosulfonyl-R1,R2 phenoxyacetil with the 3,5-dimethyl pyrazole which can have potential biological properties. The synthesis stages of the new products are presented as well as the elemental analysis data and IR, 1H-NMR spectral measurements made for elucidating the chemical structures and thermostability study which makes evident the temperature range proper for their use and storage. The obtained results were indicative of a good correlation of the structure with the thermal stability as estimated by means of the initial degradation temperatures as well as with the degradation mechanism by means of the TG-FTIR analysis.

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