scholarly journals Comparative Evaluation of the Rheological Properties, upon Addition of Water, of Three Commercially Available Zinc Oxide Eugenol Impression Materials

2021 ◽  
Vol 10 (23) ◽  
pp. 1788-1793
Author(s):  
Savitha Dandekeri ◽  
Rochelle D’Souza ◽  
Uma Mayoor Prabhu ◽  
Sanath Kumar Shetty ◽  
Karkala Sayed Suhaim ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Maximum Flow ◽  
Flow Property ◽  
Mean Flow ◽  
Flow Properties ◽  
Zinc Oxide Eugenol ◽  
Impression Materials ◽  
The Mean ◽  
Post Hoc ◽  
Available Zinc

BACKGROUND Zinc oxide eugenol (ZOE) impression paste is commonly used for secondary impression. Water acts as an accelerator to zinc oxide eugenol paste. Study was carried out to determine its flow property and the effect of addition of water on flow properties for different commercially available zinc oxide eugenol impression pastes. We wanted to compare and evaluate the flow properties of ZOE impression paste without water and after addition of water as an accelerator for three different commercially available zinc oxide eugenol impression pastes. METHODS Three commercially available zinc oxide eugenol impression pastes used were - DPI (Dental Product of India), Neogenate (Septodont), IMAGE (Prime Dental Pro.Ltd). A total of 15 discs were made without accelerator and with addition of 1, 2 and 3 drops of water for the three brands of the zinc oxide eugenol paste. Then the flow of each was tested. Data of flow was analysed using one way- ANOVA and post hoc test. RESULTS It was found that the mean flow of zinc oxide eugenol impression paste without the use of accelerator for DPI, Septodont, Image was 4.72 ± 0.56, 4.20 ± 0.75, and 3.50 ± 0.57 respectively. The mean flow of zinc oxide eugenol impression paste with the use of one drop of accelerator for DPI, Septodont, Image was 4.98 ± 0.3493, 4.54 ± 0.6025, and 3.940 ± 0.4722 respectively. With the use of two and three drops of accelerator for DPI was 4.18 ± 0.7259 and 2.68 ± 0.3701, for Septodont was 3.880 ± 0.6907 and 2.32 ± 0.2775 and for Image flow was 3.20 ± 0.5745 and 1.80 ± 0.4000. CONCLUSIONS DPI had the maximum flow as compared to other brands of zinc oxide eugenol impression paste. KEY WORDS Zinc Oxide Eugenol, Impression Material, Flow, and Accelerator

scholarly journals An In Vitro study to evaluate and compare the flow property of different commercially available zinc oxide eugenol impression materials

2018 ◽  
Vol 9 (5) ◽  
pp. 137
Author(s):  
AnujHarish Chandak ◽  
SaeeP Deshmukh ◽  
UshaM Radke ◽  
RajlakshmiS Banerjee ◽  
TusharK Mowade ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
In Vitro Study ◽  
Flow Property ◽  
Vitro Study ◽  
Zinc Oxide Eugenol ◽  
Impression Materials ◽  
Available Zinc

Retentiveness of Various Luting Agents Used With Implant-Supported Prosthesis: An In Vitro Study

2014 ◽  
Vol 40 (6) ◽  
pp. 649-654 ◽  
Author(s):  
Pooja Garg ◽  
Malesh Pujari ◽  
D. R. Prithviraj ◽  
Sumit Khare
Keyword(s):  
Zinc Oxide ◽  
Zinc Phosphate ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Mean Values ◽  
Pull Out ◽  
Zinc Oxide Eugenol ◽  
Bonferroni Test ◽  
The Mean ◽  
Ionomer Cement

Desired retrievability of cemented implant-supported fixed prosthesis makes the retentive strength of cementing agents an important consideration. The aim of the study was to evaluate the retentiveness of purposely designed implant cement and compare its retentiveness with dental cements that are commonly used with implant systems. Ten implant analogs were embedded in auto-polymerizing acrylic resin blocks and titanium abutments were attached to them. Fifty standardized copings were waxed directly on the abutment and casted. The cements used were: (1) resin-bonded zinc oxide eugenol cement, (2) purposely designed implant cement, (3) zinc phosphate cement, (4) zinc polycarboxylate cement, and (5) glass ionomer cement. After cementation, each sample was subjected to a pull-out test using universal testing machine and loads required to remove the crowns were recorded. The mean values and standard deviations of cement failure loads were analyzed using ANOVA and Bonferroni test. The mean values (± SD) of loads at failure (n = 10) for various cements were as follows (N): resin-bonded zinc oxide eugenol cement 394.62 (± 9.76), Premier implant cement 333.86 (± 18.91), zinc phosphate cement 629.30 (± 20.65), zinc polycarboxylate cement 810.08 (± 11.52), and glass ionomer cement 750.17 (± 13.78). The results do not suggest that one cement type is better than another, but they do provide a ranking order of the cements regarding their ability to retain the prosthesis and facilitate easy retrievability.

PIV-POD Investigation of the Wake of a Sharp-Edged Flat Bluff Body Immersed in a Shallow Channel Flow

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Arindam Singha ◽  
A.-M. Shinneeb ◽  
Ram Balachandar
Keyword(s):  
Velocity Field ◽  
Channel Flow ◽  
Bluff Body ◽  
Maximum Flow ◽  
Velocity Fields ◽  
Central Plane ◽  
Mean Flow ◽  
Mean Velocity ◽  
Near Surface ◽  
The Mean

This paper reports particle-image velocimetry measurements of instantaneous velocity fields in the wake of a sharp-edged bluff body immersed vertically in a shallow smooth open channel flow. The maximum flow velocity was 0.19 m/s and the Reynolds number based on the water depth was 18,270. The purpose of the present study is to show the vertical variation of the velocity field in the near region of a shallow wake. Measurements of the flow field in the vertical central plane and in the horizontal near-bed, mid-depth, and near-surface planes were taken. Then, the mean flow quantities such as the mean velocity, turbulence intensity, and Reynolds stress fields were investigated. In addition, the proper orthogonal decomposition technique was used to reconstruct the velocity fields to investigate the energetic vortical structures. The results showed that the largest recirculation zone in the mean velocity fields occurred in the mid-depth velocity field, while the smallest one occurred near the bed. Also, the fluid was entrained from the sides toward the wake central plane in the three horizontal velocity fields but with different rates. This behavior was attributed to the existence of quasi-streamwise vortices near the boundaries. In addition, patterns of ejection and sweep events near the free surface similar to the features commonly observed near the wall-bounded flows were observed.

scholarly journals Factors affecting the setting time of zinc oxide-eugenol impression materials. The influence of humidity and temperature to the reaction velocity.

1989 ◽  
Vol 33 (1) ◽  
pp. 127-132 ◽  
Author(s):  
Keiji Kumagai ◽  
Nobutoshi Tamiya ◽  
Kazuo Iwamoto ◽  
Yuji Taniguchi ◽  
Hideo Takeda ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Setting Time ◽  
Factors Affecting ◽  
Reaction Velocity ◽  
Zinc Oxide Eugenol ◽  
Impression Materials

Effect of Intermixing Brands on the Dimensional Accuracy of Master Cast using Putty-wash Impression Technique

2016 ◽  
Vol 17 (9) ◽  
pp. 734-739
Author(s):  
Mohammed E Sayed ◽  
Bandar MA Al-Makramani ◽  
Fuad A Al-Sanabani ◽  
Mohamed S Mohamed
Keyword(s):  
Stainless Steel ◽  
Dimensional Accuracy ◽  
Mean Value ◽  
Two Dimensions ◽  
Impression Material ◽  
Impression Technique ◽  
Impression Materials ◽  
Significant Difference ◽  
The Mean ◽  
Post Hoc

ABSTRACT Aim The aim of this study was to evaluate the effect of intermixing brands of addition silicone impression materials on the dimensional accuracy of stone models using two-step putty-wash technique. Materials and methods Two common brands of addition silicone impression material (Express and Aquasil) were used in this study. A total of 40 impressions of a stainless steel model simulating a three-unit bridge were made, 10 impressions for each group. Accuracy was assessed by measuring two dimensions (inter-abutment and intra-abutment) on stone models obtained from impressions of the stainless steel model. Each sample was measured thrice and the mean value was calculated. The data were analyzed using analysis of variance (ANOVA) and Scheffe's post hoc test. Results The results indicated that each of the inter-abutment and intra-abutment dimensions of the stone models was significantly higher than those for the stainless steel model (p < 0.001). However, there was no statistically significant difference in each of the inter-abutment and intra-abutment dimensions of the stone models among the four tested groups (p < 0.05). Conclusion The results obtained were statistically analyzed and the values of the inter-abutment and intra-abutment dimensions were all within the clinically acceptable range. Clinical significance Intermixing brands of additional silicone impression materials evaluated in this study did not affect the dimensional accuracy of obtained stone casts. This will help to minimize the wastage of materials due to lack of either light or putty consistency of the same brand of additional silicone impression material. How to cite this article Sayed ME, Al-Makramani BMA, Al-Sanabani FA, Mohamed MS. Effect of Intermixing Brands on the Dimensional Accuracy of Master Cast using Putty-wash Impression Technique. J Contemp Dent Pract 2016;17(9):734-739.

Nozzle Admittance and Damping Analysis Using the LEE Method

2017 ◽  
Vol 34 (1) ◽  
Author(s):  
Wang Mu-xin ◽  
Liu Pei-jin ◽  
Yang Wen-jing ◽  
Wei Xiang-geng
Keyword(s):  
Theoretical Analysis ◽  
Acoustic Energy ◽  
Mean Flow ◽  
Flow Properties ◽  
Linearized Euler Equations ◽  
Oscillation Modes ◽  
Nozzle Size ◽  
Half Angle ◽  
The Mean

AbstractThe nozzle admittance is very important in the theoretical analysis of nozzle damping in combustion instability. The linearized Euler equations (LEE) are used to determine the nozzle admittance with consideration of the mean flow properties. The acoustic energy flux through the nozzle is calculated to evaluate the nozzle damping upon longitudinal oscillation modes. Then the parametric study, involving the nozzle convergent geometry, convergent half angle and nozzle size, is carried out. It is shown that the imaginary part of the nozzle admittance plays a non-negligible role in the determination of the nozzle damping. Under the conditions considered in this work (

scholarly journals Application of entropic approach to estimate the mean flow velocity and Manning roughness coefficient in a high-curvature flume

2016 ◽  
Vol 48 (3) ◽  
pp. 634-645 ◽  
Author(s):  
D. Termini ◽  
T. Moramarco
Keyword(s):  
Flow Velocity ◽  
Maximum Flow ◽  
Roughness Coefficient ◽  
Mean Flow ◽  
Mean Velocity ◽  
Bed Deformation ◽  
Side Walls ◽  
The Mean ◽  
Manning Roughness ◽  
Mean Flow Velocity

The entropy-based approach allows the estimation of the mean flow velocity in open channel flow by using the maximum flow velocity. The linear relationship between the mean velocity, umax, and the mean flow velocity, um, through the dimensionless parameter Φ(M), has been verified both in natural rivers and in laboratory channels. Recently, the authors of this study investigated the reliability of the entropy-based formula in a straight channel and under different bed and side-walls' roughness conditions. The present study aims to further validate the entropy-based approach and to explore the effectiveness of entropy-based formula in high curvature channels. Results show that as the effect of the downstream variation of the channel's curvature the value of the parameter Φ(M) varies along the bend. When the bed deformation is evident, the variation of the parameter Φ(M) is strongly reduced compared to that obtained in absence of bed deformation. Results also show that the Manning's roughness coefficients determined through entropy-based formula are in agreement with those estimated by applying other literature's expressions but, unlike the latter, through the parameter Φ(M) the entropy-based formula could account for the effects due to the advective momentum transport by cross-circulation along the strongly curved reaches of the channel.

Velocity profiles assessment in natural channels during high floods

2011 ◽  
Vol 42 (2-3) ◽  
pp. 162-170 ◽  
Author(s):  
Tommaso Moramarco ◽  
Carla Saltalippi ◽  
Vijay P. Singh
Keyword(s):  
Flow Velocity ◽  
Maximum Flow ◽  
Velocity Profiles ◽  
Mean Flow ◽  
Velocity Measurements ◽  
Mean Velocity ◽  
Flow Area ◽  
The Mean ◽  
Logarithmic Law ◽  
Maximum Flow Velocity

The accuracy of three different approaches for velocity profiles assessment during high floods, when the velocity points sampling is carried out only in the upper portion of the flow area, has been investigated. The first two methods assume the classical logarithmic law with additional terms, to take account of the dip-phenomenon in the velocity profile. The third one is based on the entropy theory and uses the maximum flow velocity occurring in the flow area. A sample of velocity measurements carried out at Pontelagoscuro gauged section (Po River, Italy), has been considered for the analysis. Six flood events have been selected and the accuracy of the investigated methods has been evaluated in terms of mean error in estimating both the mean velocity along each sampled vertical and the mean flow velocity. For high floods, the logarithmic law and the entropic approach were found quite accurate; however, the ability of the latter in reproducing the velocity profiles only by sampling the maximum flow velocity has been shown. Therefore, a procedure for velocity measurements based on the entropic approach has been proposed. The procedure allows one to both to shorten remarkably the time of the velocity sampling and to quickly estimate the discharge.

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