scholarly journals Penetration and Tensile Strength of Various Impression Materials of Vinylsiloxanether, Polyether, and Polyvinylsiloxane Impression Materials

2021 ◽  
Author(s):  
Pongsakorn Apinsathanon ◽  
Bishwa Prakash Bhattarai ◽  
Suphachai Suphangul ◽  
Natthamet Wongsirichat ◽  
Napapa Aimjirakul
Keyword(s):  
Tensile Strength ◽  
The Novel ◽  
Ability Test ◽  
Significance Level ◽  
Impression Materials ◽  
Significant Difference ◽  
Penetration Ability ◽  
Moist Environment ◽  
Dental Impression ◽  
The One

Abstract Objectives The aim of this study was to evaluate and compare penetration ability and tensile strength among vinylsiloxanether (VSE), polyether (PE), and polyvinylsiloxane (PVS) elastomeric dental impression materials. Materials and Methods The models were constructed for penetration ability test by simulated gingival sulcus width and moist environment. The 0.05, 0.1, and 0.2 mm of simulated gingival sulcus widths were used. Each simulated gingival sulcus width was impressed 10 repeats per one elastomeric impression material. All extension of elastomeric dental impression materials was scaled by Measuring Microscope (MM-11; Nikon, Tokyo, Japan). On the issue of the tensile strength study, the models were constructed following type 1 of the ISO 37:2017 specifications and/or type C of ASTM.D412 specifications. The two-way analysis of variance (ANOVA) and Tukey's honest significant difference test were performed in the penetration ability test. The one-way ANOVA and Dunnett's T3 test were performed in the tensile strength test. The significance level was set at 0.05. Results PE showed the best extension into all widths of simulated sulcus followed by VSE and PVS, respectively. PVS was significantly higher in tensile strength than VSE and PE, while VSE was significantly higher than PE. Conclusion Penetration ability of elastomeric dental impression materials was depended on gingival sulcus width. The wider the sulcular width, the better the penetration ability of elastomeric dental impression materials. PE presented the best penetration ability, while the novel PVS showed highest tensile strength.

scholarly journals Tensile Strength of Glass Fiber Posts Submitted to Different Surface Treatments

2013 ◽  
Vol 24 (6) ◽  
pp. 626-629 ◽  
Author(s):  
Maria Isabel A. Faria ◽  
Erica Alves Gomes ◽  
Danielle Cristine Messias ◽  
Joao Manoel Silva Filho ◽  
Celso Bernardo Souza Filho ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Testing Machine ◽  
Surface Treatments ◽  
Significance Level ◽  
Fiber Posts ◽  
Group I ◽  
Significant Difference ◽  
Glass Fiber Posts

The aim of this in vitro study was to evaluate the tensile strength of glass fiber posts submitted to different surface treatments. Forty-eight maxillary canines had their crowns sectioned and root canals endodontically treated. The roots were embedded in acrylic resin and distributed into 3 groups according to the surface treatment: Group I: the posts were treated with silane agent for 30 s and adhesive; Group II: the posts were cleaned with alcohol before treatment with silane agent and adhesive; Group III: the posts were submitted to conditioning with 37% phosphoric acid for 30 s before treatment with silane agent and adhesive. Each group was divided into 2 subgroups for adhesive polymerization or not before insertion into the canal: A - adhesive was not light cured and B - adhesive was light cured. All posts were cemented with Panavia F and the samples were subjected to tensile strength test in a universal testing machine at crosshead speed of 1 mm/min. Data were submitted to one-way ANOVA and Tukey's test at 5% significance level. There was statistically significant difference (p<0.01) only between group GIII-B and groups GI-A and GI-B. No significant difference was found among the other groups (p>0.05). It was concluded that the products used for cleaning the posts influenced the retention regardless of adhesive light curing.

scholarly journals A Study on Imbibition and Syneresis in Four Commercially Available Irreversible Hydrocolloid (Alginate) Impression Materials

2012 ◽  
Vol 2 (1) ◽  
pp. 1-4
Author(s):  
Sanjeev Mittal ◽  
Sanjay Bansal ◽  
Shushant Garg ◽  
Gagandeep Kansal
Keyword(s):  
Measured Quantity ◽  
Time Interval ◽  
Time Intervals ◽  
Impression Materials ◽  
Group I ◽  
Significant Difference ◽  
Irreversible Hydrocolloid ◽  
Insignificant Difference ◽  
The One ◽  
Post Hoc

ABSTRACT Purpose To evaluate imbibition and syneresis in four commercially available irreversible hydrocolloid (alginate) impression materials at different time intervals (10, 20 and 30 minutes). Materials and methods Eighty samples of four commercially available irreversible hydrocolloid (alginate) impression materials Algitex (DPI, Mumbai), Plastalgin (Septodont, Cedex, France), Zelgan 2002 (Dentsply), Finndent (Pyrex Polykem) were made. Twenty samples each of four irreversible hydrocolloid (alginate) impression materials were grouped into four groups (I, II, III and IV). Measured quantity of alginate powder and liquid was used to make samples. The samples were evaluated for imbibition and syneresis at different time intervals (i.e.10, 20, and 30 minutes) by weighing on electronic analytic balance. The data were analyzed using the one-way ANOVA, post hoc test and t-test. Results The statistical data revealed that imbibition within four groups of irreversible hydrocolloid (alginate) impression materials were not significant. Regarding syneresis there was insignificant difference between the four groups but within the group itself they showed significant difference between them depending upon the time interval. It was observed that Group I showed significant difference in syneresis at time interval of 10 to 20 minutes. Group II showed significant difference in syneresis at time interval of 10 to 30 minutes. Conclusion This study demonstrated that four groups of irreversible hydrocolloid (alginate) impression materials showed different rates of imbibition and syneresis at time interval of 10, 20 and 30 minutes depending upon molecular weight, calcium concentration and environmental conditions. How to cite this article Garg S, Mittal S, Bansal S, Kansal G. A Study on Imbibition and Syneresis in Four Commercially Available Irreversible Hydrocolloid (Alginate) Impression Materials. Int J Prosthodont Restor Dent 2012;2(1):1-4.

scholarly journals STUDY OF TENSILE STRENGTH OF WOOD CONNECTION USING WASTE PLASTIC BOTTLES CONNECTOR AS ADDITIONAL MATERIALS OF WOOD STRUCTURAL SUBJECT.

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Aprilia Dwi Lestari ◽  
Anis Rahmawati ◽  
Taufiq Lilo Adi Sucipto
Keyword(s):  
Tensile Strength ◽  
Quantitative Method ◽  
Experimental Approach ◽  
Statistical Data ◽  
Waste Plastic ◽  
Significance Level ◽  
Plastic Bottle ◽  
Significant Difference ◽  
One Way Anova ◽  
Homogeneous Data

This research was aims to know 1) whether there was a significant difference from tensile strength of wood connection with plastic bottle waste between A bottle, B, C, D, E, and F bottle, 2) plastic bottle which produced the wood connection with the highest tensile strength. This research used quantitative method of experimental approach. The population of this research were wood with the connection of plastic bottles by heating. This technique was inspired by Micaella Pedros, an England artist who first applied it known as Joining Bottles. Dimensions for tensile test parallel that was 2,5 x 2,5 x 46 cm with total 30 samples. The length of the bottle connection is 10 cm with 1 layer only. This research used quantitative method of experimental approach. Data analysis used one way anova test, 0.05 significance level with the requirement of normal data and homogeneous data. Statistical data of this research results showed 1) no significant difference tensile strength of the six plastic bottles connector. 2) The F bottle produced the highest tensile strength that was 0,622 MPa.

scholarly journals An investigation of fear of COVID-19 status in university student athletes from different sports associated with contact

2021 ◽  
Vol 25 (2) ◽  
pp. 117-128
Author(s):  
Celil Kaçoğlu ◽  
Halil O. Çobanoğlu ◽  
Emre Şahin
Keyword(s):  
Analysis Of Variance ◽  
Female Athletes ◽  
Educational Status ◽  
Demographic Variables ◽  
Male Athletes ◽  
Significance Level ◽  
Significant Difference ◽  
Package Program ◽  
Bonferroni Test ◽  
The One

Background and Study Aim. The aim of this research is to (i) examine the COVID-19 fear scales according to the contact rate of the sports branch of the athletes and (ii) examine the COVID-19 fear scales according to some demographic variables of the athletes. Material and Methods. Sport Sciences Faculty students athletes (n=176) in sports with different levels of contact voluntarily participated in the current study. The fear of COVID-19 scale consisting of a total of 7 items and demographic information form and a single sub-dimension were applied online via Google® forms to individuals who participated in the study voluntarily. The data obtained from the study were analyzed using IBM SPSS 25.0 statistics package program. Due to the normal distribution of the data, sample t-test independent of parametric tests and one-way analysis of variance tests were used in the statistical analysis of the data. Bonferroni test, one of the multiple comparison tests, was used in order to determine which groups had significance according to the results of the one-way analysis of variance test. The results were tested at a significance level of p <0.05. The Cronbach Alpha reliability coefficient for the COVID-19 fear scale was found to be 0.88. Results. Statistically significant difference was found between the fears of catching COVID-19 according to the gender of athletes in different branches (p = 0.01). No statistically significant difference was found between the fears of catching COVID-19 according to the educational status of the athletes (p = 0.31). No statistically significant difference found between the fears of catching COVID-19 according to the contact included in the specialty sports of the athletes in different branches (p = 0.56). Statistically significant difference was found between the highest level (professional) and intermediate level (amateur) groups ) in terms of fear of catching COVID-19 (p = 0.02). No statistically significant difference found between the fears of catching COVID-19 (p = 0.08) of the athletes in different branches according to their sports experience. Statistically significant difference was found in terms of fear of catching COVID-19 between the 4-6 years and 7-9 years groups with sports experience (p = 0.02). In addition, it has been revealed that the average scores of COVID-19 fear scales (20.05 ± 4.79) of female athletes are higher than the average scores of male athletes (17.67 ± 6.75).Conclusions. As a result, this research has revealed that the fear of COVID-19 does not differ relative to the contact levels of a specific sports branch. In addition, it has shown that the fear of COVID-19 is greater in female athletes compared to male athletes and lower performance levels and less competition experiences are in fact causing an increase in fear of COVID-19.

scholarly journals The Father’s Curse in Fyodor Dostoevsky’s Novel The Humiliated and the Insulted

2021 ◽  
pp. 172-179
Author(s):  
Daria G. Shervarly
Keyword(s):  
The Other ◽  
The Novel ◽  
Prodigal Son ◽  
Significant Difference ◽  
Main Factors ◽  
The One ◽  
High Degree ◽  
Proper Behavior

One of the significant themes of the novel The Humiliated and the Insulted is the father’s curse, marked throughout the text by a high degree of emotionality. The novel describes two similar stories: the one of Nelly’s mother and Natasha’s. Both escaped from home, both were cursed by their fathers. However, there are also differences: while one father forgave, the other not. In the article, the theme of the father’s curse is revealed by comparing these two stories with the famous parable of the prodigal son, with which the novel presents visible parallels. The parable is presented as a standard for proper behavior, and in its comparison, we can say how the hero should have behaved and how he did in the novel. While the images of “prodigal children” recall each other, it is the behavior of parents that draws a significant difference between Dostoevsky’s plot and the parable. The presence or absence of the father’s curse is revealed as one of the main factors determining the fate of all the characters of the story.

scholarly journals Dimensional Stability of Alginates Molds Tridimentionally Scanned

2018 ◽  
Vol 20 (2) ◽  
pp. 78
Author(s):  
Marciana Castanha De Oliveira ◽  
Thais Maira Borges ◽  
Flaviana Alves Dias ◽  
Paula Vanessa Pedron Oltramari-Navarro ◽  
Marcelo Lupion Poletic ◽  
...  
Keyword(s):  
Social Sciences ◽  
Gold Standard ◽  
Intraclass Correlation ◽  
Transverse Dimension ◽  
Control Group ◽  
Method Error ◽  
Significance Level ◽  
Impression Materials ◽  
Significant Difference ◽  
One Way Anova

AbstractAlginate is among the most used materials in dentistry to create teeth negative printing and reproduction. The goal of this study was to compare dimensional changes of alginate scanned impression materials. Thirty impressions of a standard typodont were performed using three types of alginate (Hydrogum 5; Jeltrate Plus and Avagel). The impressions were scanned by the scanner 3Shape R700T and scans were performed immediately after molding. The analysis of digita models were performed at OrthoAnalyzer ™ 3D software. Measurements were carried out in relation to the transverse dimension (intercanine, interpremolares and intermolar). Method error was evaluated through the Intraclass Correlation Coefficient (ICC) and Bland-Altman. One-way ANOVA, Dunnet Post-test were used to compare the different groups in relation to Typodont (gold standard) for the different outcome variables. The data were tabulated in Statistical Package for Social Sciences version 20.0 and Minitab 17.0 softwares to compare groups. The significance level was 5%. The posterior transverse variables (D1PM, D2PM and DM) presented a statistically significant difference regarding the gold standard (Typodont) for the plaster models performed after the Avagel molding. In the digital models performed just after molding, only in DM, the Avagel material group presented values statistically higher than the control group. The alginates Hydrogum 5 and Jeltrate Plus presented dimensions closer to the gold standard.Keywords: Dental Impression Materials. Dental Models. Imaging, Three-Dimensional.ResumoO alginato está entre os materiais de moldagem mais utilizados na Odontologia para criar impressão e reprodução negativa dos dentes. O objetivo desse trabalho foi comparar alterações transversais de três marcas comerciais de alginato (Hydrogum, Jeltrate e Avagel) em moldes de alginatos. Trinta moldes de um Typodont padrão foram realizados, utilizando três tipos de alginato (Hydrogum 5; Jeltrate Plus e Avagel). Os moldes foram escaneados por meio do scanner 3Shape R700T e os escaneamentos realizados logo após a moldagem e logo após a obtenção dos modelos de gesso. As análises dos modelos digitais foram realizadas no software OrthoAnalyzer™ 3D. Foram realizadas mensurações em relação à discrepância transversal (inter-caninos, inter primeiro pré-molar, inter-segundo pré-molar e inter-molares). O erro do método foi avaliado por meio do Coeficiente de Correlação Intraclasse (CCI) e Bland-Altman. Utilizou-se Análise de Variância (one-way ANOVA, Pós-teste Dunnet) para comparação dos diferentes grupos em relação ao typodont (padrão-ouro) para as diferentes variáveis de desfecho. A análise estatística foi realizada nos programas Statistical Package for Social Sciences versão 20.0 e no programa Minitab 17.0 para comparação dos grupos. O nível de significância foi de 5%. As variáveis transversais posteriores (D1PM; D2PM e DM) apresentaram diferença estatisticamente significante em relação ao padrão-ouro (manequim) para os modelos de gesso realizados após a moldagem com Avagel. Nos modelos digitais realizados logo após a moldagem, apenas na DM, o grupo do material Avagel apresentou valores estatisticamente maiores do que o grupo controle. Os alginatos Hydrogum 5 e Jeltrate Plus apresentaram dimensões mais próximas do padrão-ouro.Palavras-chave: Materiais para Moldagem Odontológica. Modelos Dentários. Imagem Tridimensional.

scholarly journals Sustained auditory attention ability in children based on the breathing mode

Revista CEFAC ◽  
2020 ◽  
Vol 22 (3) ◽  
Author(s):  
Joel de Braga Junior ◽  
Ana Paula Blanco-Dutra ◽  
Maria Madalena Canina Pinheiro
Keyword(s):  
Statistical Tests ◽  
Auditory Attention ◽  
Chi Square ◽  
Ability Test ◽  
Group Of Seven ◽  
Significant Difference ◽  
Inferential Analysis ◽  
The One ◽  
Following Error ◽  
Auditory Behavior

ABSTRACT Purpose: to analyze the auditory behavior and the performance in the Sustained Auditory Attention Ability Test (SAAAT) of children with different breathing modes. Methods: a total of 30 individuals (19 males and 11 females), ranging from seven to 11 years old, participated in the research. They were distributed into nasal-breathers, mouth-breathers, and oronasal-breathers groups. The Scale of Auditory Behaviors (SAB) questionnaire was applied to those responsible for the children, so as to characterize their auditory behavior. In the SAAAT, the following error patterns were analyzed: inattention, decreased vigilance, impulsivity, and total errors. For the inferential analysis, the Mann-Whitney, chi-square, and Kruskal-Wallis statistical tests were used. Results: the individuals with mouth- and oronasal-breathing modes had more complaints in the SAB questionnaire when compared with nasal-breathers. Regarding the SAAAT, it was found that the age group of seven to eight years was the one that had the worst performance in the test. The groups with oral and oronasal breathing had more errors, with a statistically significant difference between the groups for inattention and total errors. Conclusion: it can be concluded that individuals with oral and oronasal breathing had more complaints in the auditory behavior and worse performance in the SAAAT, especially for inattention and total errors.

scholarly journals Effect of Super-Oxidized Water, Sodium Hypochlorite and EDTA on Dentin Microhardness

2014 ◽  
Vol 25 (5) ◽  
pp. 420-424 ◽  
Author(s):  
Alexandre Corrêa Ghisi ◽  
Patrícia Maria Poli Kopper ◽  
Flávia E. R. Baldasso ◽  
Caroline P. Stürmer ◽  
Giampiero Rossi-Fedele ◽  
...  
Keyword(s):  
Sodium Hypochlorite ◽  
Root Canal ◽  
Root Surface ◽  
Negative Control ◽  
Significance Level ◽  
Significant Difference ◽  
Control Root ◽  
Root Canal Dentin ◽  
The One ◽  
Cervical Root

The present study aimed to evaluate the influence of the following irrigating solutions on the microhardness of root canal dentin: 2% sodium hypochlorite (2NaOCl), 5% sodium hypochlorite (5NaOCl), super-oxidized water (400 ppm Sterilox - Sx) and 17% EDTA (E). Eighty roots from bovine incisors were randomly divided into 8 groups (n=10): 2NaOCl, 5NaOCl, Sx, and 2NaOCl + E, 5NaOCl + E, Sx + E (associated with E as final irrigant for 5 min), E solely and distilled water (dH2O) as the negative control. Root canal preparation was performed by hand instruments, using one of the irrigation protocols for 30 min. Then, 5 mm of the cervical root third were cut out from each sample and subjected to the Vickers microhardness test, at two points, one at approximately 500-1000 µm from the root canal lumen (distance 1), and the other at approximately 500-1000 µm from the external root surface (distance 2). Data were analyzed by Wilcoxon and Kruskal-Wallis tests at 5% significance level. Microhardness values at distance 1 were significantly lower than those at distance 2 for all groups, except 5NaOCl and 5NaOCl + E groups (p>0.05). EDTA showed the lowest microhardness values. However, no statistically significant difference was detected among groups at distance 1 and EDTA was significantly different only from Sx at distance 2. In conclusion, all tested solutions showed lower microhardness at the most superficial root canal dentin layer compared to the one found near the external root surface, except 5NaOCl and 5NaOCl + E; EDTA promoted lower microhardness values in comparison to Sterilox at this site.

scholarly journals Quantitative evaluation of apically extruded debris during root canal instrumentation with ProTaper Universal, ProTaper Next, WaveOne, and self-adjusting file systems

2014 ◽  
Vol 08 (04) ◽  
pp. 504-508 ◽  
Author(s):  
Damla Ozsu ◽  
Ertugrul Karatas ◽  
Hakan Arslan ◽  
Meltem C. Topcu
Keyword(s):  
Root Canal ◽  
File Systems ◽  
Universal Group ◽  
Significance Level ◽  
Root Canals ◽  
Single File ◽  
Measurable Amount ◽  
Significant Difference ◽  
The One ◽  
Root Canal Instrumentation

ABSTRACT Objectives: The aim of this study was to compare the amount of apically extruded debris during preparation with ProTaper Universal (Dentsply Maillefer, Ballaigues, Switzerland), ProTaper Next (Dentsply Maillefer), a reciprocating single-file (WaveOne; VDW GmbH, Munich, Germany), and a self-adjusting file (SAF; ReDent Nova, Ra'anna, Israel). Materials and Methods: Fifty-six intact mandibular premolar teeth were randomly assigned to four groups. The root canals were prepared according to the manufacturers’ instructions using the ProTaper Universal, ProTaper Next, WaveOne, and SAF. Apically extruded debris was collected in preweighted Eppendorf tubes during instrumentation. The net weight of the apically extruded debris was determined by subtracting the preweights and postweights of the tubes. The data were statistically analyzed using the one-way analysis of variance and the least significant difference tests at a significance level of P < 0.05. Results: A measurable amount of debris was apically extruded in all groups, and the amounts of debris extrusion in the groups were statistically significant (P < 0.001). The ProTaper Next and WaveOne groups resulted in less debris extrusion than the ProTaper Universal group (P < 0.05), and the SAF group resulted in the least debris extrusion. Conclusions: Within the limitations of the present study, it can be concluded that all systems extruded debris beyond the apical foramen.

scholarly journals The Father’s Curse in Fyodor Dostoevsky’s Novel The Humiliated and the Insulted

2021 ◽  
pp. 172-179
Author(s):  
Daria G. Shervarly
Keyword(s):  
The Other ◽  
The Novel ◽  
Prodigal Son ◽  
Significant Difference ◽  
Main Factors ◽  
The One ◽  
High Degree ◽  
Proper Behavior

One of the significant themes of the novel The Humiliated and the Insulted is the father’s curse, marked throughout the text by a high degree of emotionality. The novel describes two similar stories: the one of Nelly’s mother and Natasha’s. Both escaped from home, both were cursed by their fathers. However, there are also differences: while one father forgave, the other not. In the article, the theme of the father’s curse is revealed by comparing these two stories with the famous parable of the prodigal son, with which the novel presents visible parallels. The parable is presented as a standard for proper behavior, and in its comparison, we can say how the hero should have behaved and how he did in the novel. While the images of “prodigal children” recall each other, it is the behavior of parents that draws a significant difference between Dostoevsky’s plot and the parable. The presence or absence of the father’s curse is revealed as one of the main factors determining the fate of all the characters of the story.

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