scholarly journals Relative Translucency of a Multilayered Ultratranslucent Zirconia Material

2017 ◽  
Vol 18 (12) ◽  
pp. 1099-1106 ◽  
Author(s):  
Loubna Shamseddine ◽  
Zeina Majzoub
Keyword(s):  
Clinical Significance ◽  
Analysis Of Variance ◽  
Digital Images ◽  
Multiple Comparisons ◽  
The Other ◽  
International Commission ◽  
Transitional Layer ◽  
Post Hoc ◽  
Cie Lab ◽  
Enamel Layer

ABSTRACT Aim The aim of this study was to compare the translucency parameter (TP) of ultratranslucent multilayered (UTML) zirconia according to thickness and layer level. Materials and methods Rectangles of UTML zirconia with four layers [dentin layer (DEL), first transitional layer (FTL), second transitional layer (STL), and enamel layer (ENL)] and four different thicknesses (0.4, 0.6, 0.8, and 1 mm) were milled from blanks. Digital images were taken in a dark studio against white and black backgrounds under simulated daylight illumination and international commission on illumination (CIE) Lab* color values recorded using Photoshop Creative Cloud software. The TP was computed and compared according to thickness and layer level using analysis of variance (ANOVA) followed by Bonferroni post hoc analysis for multiple comparisons. Significance was set at p < 0.05. Results In each thickness, TP values were similar between any two layers. The significant effect of thickness on the TP was observed only in the first two layers. In the DEL, translucency was significantly greater at 0.4 mm than all other thicknesses. In the FTL, differences were significant between 0.4 and 0.8 mm and between 0.4 and 1 mm. Conclusion The investigated zirconia does not seem to show gradational changes in relative translucency from dentin to enamel levels regardless of the thickness used. Thickness affected the TP only in the first two layers with better translucency at 0.4 mm. Clinical significance Since relative translucency does not seem to be significantly different between layers, clinicians can modify the apicocoronal positioning of the UTML layers within the restoration according to the desired Chroma without any implications on the clinically perceived translucency. While the thickness of 0.4 mm may be suggested for anterior esthetic veneers because of its higher translucency, the other thicknesses of 0.6 to 1 mm can be used to mask colored abutments in full contour restorations. How to cite this article Shamseddine L, Majzoub Z. Relative Translucency of a Multilayered Ultratranslucent Zirconia Material. J Contemp Dent Pract 2017;18(12):1099-1106.

Psychophysically Based Physical Capability Limits For Right Angle Power Tool Operation

2020 ◽  
Vol 64 (1) ◽  
pp. 910-914
Author(s):  
Jonathan Valencia ◽  
Joel Cort
Keyword(s):  
Analysis Of Variance ◽  
The Other ◽  
Mixed Design ◽  
Joint Orientation ◽  
Physical Capability ◽  
Subject Variables ◽  
Group A ◽  
Repeated Analysis ◽  
Post Hoc

A psychophysical methodology was utilized to examine 40 non-skilled female participants performing right-angle power tool (RAPT) fastening tasks. A combination of two between subject variables were examined for a total of four between-subject groups: joint orientation (horizontal and vertical planes) and joint hardness (hard and soft joints). Participants were evenly distributed into one of four joint orientation- hardness groups. Within each group, a combination of three fastening strategies and three fastening frequencies were performed by each participant. The chosen target torque determined the physical capability limits (PCL). A mixed-design repeated analysis of variance with Tukey’ significance post hoc test were used to determine any significance with the measured variables ( p<0.05). Fastening strategy and frequency influenced the chosen torque magnitude. Participants chose significantly higher target torques with the Turbo Tight strategy in comparison to the other two strategies. Furthermore, participants chose to accept lower target torques and forces as fastening frequency increased.

scholarly journals Fluoride kinetics in saliva after the use of a fluoride-containing chewing gum

2005 ◽  
Vol 19 (4) ◽  
pp. 256-260 ◽  
Author(s):  
Maria Francisca Thereza Borro Bijella ◽  
Fernanda Lourenção Brighenti ◽  
Maria Fernanda Borro Bijella ◽  
Marília Afonso Rabelo Buzalaf
Keyword(s):  
Dental Caries ◽  
Acid Hydrolysis ◽  
Analysis Of Variance ◽  
Dental Fluorosis ◽  
The Other ◽  
Chewing Gum ◽  
Other Hand ◽  
High Fluoride ◽  
The Mean ◽  
Post Hoc

There is a relationship between the use of fluoride, the reduction of dental caries and the increase of dental fluorosis. The purpose of this study was to analyze the fluoride kinetics in saliva after using the HappydentTM chewing gum, which contains 3.38 mg of fluoride as monofluorophosphate. Fifteen 7-9-year-old volunteers were instructed to chew the gum TridentTM (control) and HappydentTM on different days. Total saliva was collected for 3 minutes, at 0, 3, 6, 9, 15, 30 and 45 minutes after starting chewing. Salivary fluoride was analyzed with a fluoride-specific electrode (Orion 96-09) after acid hydrolysis. The data were analyzed by two-way analysis of variance and by Tukey’s post hoc test (p < 0.05). The mean amounts ± sd (mg) of fluoride released in saliva were 0.276 ± 0.126 and 0.024 ± 0.014 for HappydentTM and TridentTM respectively. The fluoride amount in the saliva samples after the use of Happydent was significantly higher than after the use of TridentTM in all experimental periods, except after 30 and 45 minutes. The high fluoride presence in saliva after the use of Happydent may be significant to prevent dental caries and this should be evaluated in clinical researches. On the other hand, children at an age of risk for dental fluorosis should avoid the use of HappydentTM.

scholarly journals The impact of classified and unclassified techniques on the male medalists’ offensive activity at the 2004–2016 Olympic Games

2020 ◽  
Vol 12 (4) ◽  
pp. 59-73
Author(s):  
AMAR AIT ALI YAHIA
Keyword(s):  
Size Effect ◽  
Analysis Of Variance ◽  
Unbiased Estimator ◽  
Olympic Games ◽  
Multiple Comparisons ◽  
London 2012 ◽  
Anderson Darling ◽  
High Level ◽  
Post Hoc ◽  
The Impact

Background: Judokas have thrown opponents using various techniques. The researchers’ interest in the classified technique remained relevant. No previous study has investigated the contribution of an unclassified technique to high-level judo. Aim: This work assessed the share of classified and unclassified techniques of Nage-waza on the volume of attack activity, technical repertoire, and effectiveness of medalists at Athens 2004, Beijing 2008, London 2012, and Rio de Janeiro 2016. Material and methods: The analysis focused on 3,664 Nage-waza actions, including 2,146 classified actions and 1,518 unclassified actions, performed by 112 male medalists in 575 contests. Anderson-Darling test assessed the normality of the collected data. Multiple comparisons via t Student, one-way analysis of variance, and Tukey post hoc test verified the medalists’ offensive activity. Cohen's estimator d and unbiased estimator ω2 tested the size effect of the analysis of variance. Results: To achieve such performances, medalists attempted 19.2±10.0 classified attacks and 13.6±10.5 unclassified attacks. Their effectiveness involved 2.6±1.8 classified actions and 2.0±1.8 unclassified actions, using a repertoire of 7.4±3.0 classified techniques and 4.2±2.6 unclassified techniques. Conclusions: Judicious combination of both techniques contributes to the medalists’ performance. Integrating unclassified ones as part of the training and preparedness of judokas was a prior inescapables.

Mental Arithmetic as a Function of Computerized Digit Rates, Gender, and Size of Audience

1995 ◽  
Vol 76 (1) ◽  
pp. 275-283 ◽  
Author(s):  
William F. Vitulli ◽  
Mary E. Henderson
Keyword(s):  
Interpersonal Relationships ◽  
Mental Arithmetic ◽  
Multiple Comparisons ◽  
The Other ◽  
Critical Threshold ◽  
Social Inhibition ◽  
Plot Analysis ◽  
Main Effect ◽  
The One ◽  
Post Hoc

Mental-arithmetic tests were given to 117 undergraduate volunteers (40 men and 77 women) using three rates (between groups) of digit presentation (1 sec., 2 sec., and 3 sec.) under three (within-group) sizes of audience (2 observers, 1 observer, and alone condition). Subjects were instructed to sum mentally three sets of 25 numerals ranging from 1 to 5 in computer-generated random sequences, under each of the three audience conditions. A mixed 2×3×3 split-plot analysis of variance of correct scores showed a significant main effect for rate of digit presentation, and post hoc Scheffé tests of multiple comparisons showed significant differences between the 1-sec. rate and each of the other rates (2 sec. or 3 sec.), yet no significance between 2-sec. and 3-sec. rates indicating a “critical threshold” has been identified with implications for computer-scrolled numerical information. Also, there was a significant two-way interaction between gender and size of audience. Post hoc Newman-Keuls comparisons showed women scored higher than men in the one-observer condition while men scored higher than women in the two-observer condition. Interpretations regarding interpersonal relationships and social inhibition were offered.

scholarly journals Influência da polimerização adicional na microdureza de compósitos diretos para uso indireto: estudo in vitro

2020 ◽  
Vol 42 ◽  
pp. e35
Author(s):  
Carlos Henrique Camilo Marcehsan ◽  
Angela Isabel dos Santos Dullius ◽  
Angela Pellegrin Ansuj ◽  
Vinícius Pinheiro Nunes ◽  
Gislaine Rosa Biachi
Keyword(s):  
Analysis Of Variance ◽  
Composite Resin ◽  
The Other ◽  
Distilled Water ◽  
Led Light ◽  
Post Hoc

The aim of this study was to verify the effect of additional polymerization with microwave and autoclave on the microhardness of 3 different commercial brands of composite resin compared to the ceromere. Cylindrical specimens (6mm x 3mm) were made with a split matrix divided into 10 groups of 13 bodies, with: Photoactivation (LED light on the top surface-40s; photoactivation LED + microwave (500W per 3min) immersed in 100ml distilled water and Photoactivation LED + autoclave (full cycle). The Ceromere group was activated according to the manufacturer's recommendation. The specimens went through a finishing and polishing sequence being stored with a cotton moistened in distilled water for 24h. They were taken to the microhardness meter (three dentations, 50g/15s load). The analysis of variance (ANOVA) was performed with post hoc Games Howell at a level of 5%. It was verified that the ceromere did not differ from the groups Z250 photo and microwave, but was inferior to the Z250 group with autoclave, and the microhardness of this was higher than the other groups. The Tetric group was inferior to all other groups. It was concluded that the additional polymerization methods promoted an increase of the superficial microhardness of the Z250 resin and this did not present a difference of microhardness when compared to the Ceromere

scholarly journals The Effect of Washing and Processing of PB-Polluted Vegetables towards their Levels of PB and Vitamin C

2019 ◽  
Vol 8 (11) ◽  
pp. 1735-1739
Keyword(s):  
Heavy Metal ◽  
Chemical Analysis ◽  
Vitamin C ◽  
Analysis Of Variance ◽  
Column Chromatography ◽  
Univariate Analysis ◽  
Multiple Comparisons ◽  
Regression Test ◽  
Analysis Laboratory ◽  
Post Hoc

This research tried to find out the effect of washing and processing of Pb-polluted kale in Metro, Lampung, Indonesia, where the farm is by the highway, use heavy-metal-contained fertilizer and pesticide. Plantedfor 20 days, various washing treatments were given (once, twice, and 3 times, 5 second each: unwashed as a control); and processing treatments (2 minutes steamed, 2 minutes boiled, 3 minutes stir-fried, and unprocessed as a control). The level of Pb and Vitamin C were examined using UV-Vis spectrophotometer and Column Chromatography in Chemical Analysis, Laboratory University of Muhammadiyah Malang. The Univariate Analysis of Variance showed a significant result (p<0.00) which indicates that both treatments decrease the Pb and Vitamin C within the kale. Post Hoc Multiple Comparisons and Duncan also showed a significant result. Regression Test showed that various treatments gave a different contribution to Pb and Vitamin C level. Together, the treatments reduce 94.7% of Pb level; meanwhile, the washing only contributes 54.7%, processing only 25.6%, and the rest 19.7% is determined by vegetables types and parts. Together, both treatments reduce 97.5% of Vitamin C level; the washing only contributes 0%, processing only 26.6%, and the rest 73.4% is determined by the type and parts of vegetables.

PERBANDINGAN METODE MD4 DAN SHA 384 UNTUK MENDETEKSI ORISINALITAS CITRA DIGITAL

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Lemcia Hutajulu ◽  
Hery Sunandar ◽  
Imam Saputra
Keyword(s):  
Digital Image ◽  
Detrimental Effect ◽  
Digital Images ◽  
Computer Crime ◽  
The Other ◽  
Image Manipulation ◽  
The Internet ◽  
Secret Key

Cryptography is used to protect the contents of information from anyone except those who have the authority or secret key to open information that has been encoded. Along with the development of technology and computers, the increase in computer crime has also increased, especially in image manipulation. There are many ways that people use to manipulate images that have a detrimental effect on others. The originality of a digital image is the authenticity of the image in terms of colors, shapes, objects and information without the slightest change from the other party. Nowadays many digital images circulating on the internet have been manipulated and even images have been used for material fraud in the competition, so we need a method that can detect the image is genuine or fake. In this study, the authors used the MD4 and SHA-384 methods to detect the originality of digital images, by using this method an image of doubtful authenticity can be found out that the image is authentic or fake.Keywords: Originality, Image, MD4 and SHA-384

scholarly journals Characteristics of anteroposterior curvatures of the spine in soccer and futsal players

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Krystyna Chromik ◽  
Anna Burdukiewicz ◽  
Jadwiga Pietraszewska ◽  
Aleksandra Stachoń ◽  
Paweł Wolański ◽  
...  
Keyword(s):  
College Students ◽  
Statistical Analysis ◽  
Injury Prevention ◽  
Analysis Of Variance ◽  
Statistical Significance ◽  
Body Posture ◽  
Soccer Players ◽  
Prevention Training ◽  
The Difference ◽  
Post Hoc

AbstractPurpose. The aim of the study was to determine differences in anteroposterior spine curvatures between futsal players, soccer players, and non-training students. The results may contribute to the development of present-day knowledge of posturometry, and its implementation in training can help reduce the risk of body posture disorders in athletes. Methods. The examined group consisted of 48 athletes and 38 non-training college students. Body posture parameters were measured with the use of Posturometr-S. The normality of distribution was checked with the Shapiro-Wilk test, and the differences between the groups were measured with ANOVA and the Bonferroni post-hoc test. The level of statistical significance was set at p < 0.05. Results. The analysis of angle values revealed the widest and most similar measurements in the group of futsal players and soccer players. The analysis of variance proved statistically significant differences between the soccer players and futsal players (p = 0.003). The difference between the soccer players and non-training students was statistically significant. The highest γ angular value was measured in non-training students, followed by futsal players and soccer players. The statistical analysis revealed significant differences between the non-training students and futsal players, as well as non-training students and soccer players (p < 0.001). Conclusions. A complex assessment of athletes’ body posture is crucial in injury prevention. Training overloads may often lead to disorders of the organ of locomotion and affect the correct body posture in athletes. This, in turn, may result in pains and injuries.

Comparison of plasma progesterone profiles in cyclic, pregnant, pseudopregnant and hysterectomized pigs between 8 and 27 days after oestrus

1988 ◽  
Vol 119 (1) ◽  
pp. 111-116 ◽  
Author(s):  
G. J. King ◽  
R. Rajamahendran
Keyword(s):  
Least Squares ◽  
Analysis Of Variance ◽  
The Other ◽  
Corpora Lutea ◽  
Plasma Progesterone ◽  
The Third ◽  
Secretory Potential ◽  
The Mean

ABSTRACT Plasma progesterone concentrations were compared in cyclic (n = 12), pregnant (n =12), oestradiol-induced pseudopregnant (n=12) and hysterectomized gilts (n=10) between days 8 and 27 after oestrus. The results were grouped into periods covering days 8–13, 14–20 and 21–27 and analysed by least-squares analysis of variance. Plasma progesterone concentrations were significantly (P<0·001) higher in hysterectomized compared with other groups between days 8 and 13. Progesterone concentrations declined rapidly after day 14 in cyclic females and gradually in the other groups. Throughout the third and fourth weeks the mean progesterone concentrations for hysterectomized animals were consistently higher than for pseudopregnant animals (P<0·05). The pregnant group means were below but not significantly different from the hysterectomized means in both of the last two periods. The greater progesterone concentrations in hysterectomized gilts indicated that secretion is high without any conceptus-produced or -mediated luteotrophin, and corpora lutea in cyclic, pregnant or pseudopregnant gilts may never reach full secretory potential. J. Endocr. (1988) 119, 111–116

scholarly journals Dynamic smile evaluation in different skeletal patterns

2016 ◽  
Vol 86 (6) ◽  
pp. 1019-1025 ◽  
Author(s):  
Noshi Siddiqui ◽  
Pradeep Tandon ◽  
Alka Singh ◽  
Jitesh Haryani
Keyword(s):  
Analysis Of Variance ◽  
Upper Lip ◽  
Chi Square ◽  
Causative Factors ◽  
Skeletal Pattern ◽  
Width Change ◽  
Positive Correlations ◽  
Post Hoc ◽  
Cephalometric Measurements ◽  
Horizontal Pattern

ABSTRACT Objective: To evaluate dynamic smile in different skeletal patterns and to correlate vertical smile parameters with the underlying causative factors. Materials and Methods: A total of 150 participants ranging in age from 16–25 years were selected and divided into one of three groups—horizontal, average, and vertical skeletal pattern—using the following three cephalometric parameters: SN-MP, FMA, and Jarabak ratio. Videographic records of smile were obtained, and measurements were recorded and analyzed at rest, including upper lip length, and during smile, including maxillary incisal display, interlabial gap, intercommisural width, change in upper lip length, and smile arc. Differences among the three groups were subjected to two-way analysis of variance and post hoc and chi-square tests for smile arc. Correlations between vertical smile variables and vertical skeletal (N-ANS, N-Me) and dental cephalometric measurements (U1 to palatal plane) were also investigated. Results: Vertical parameters were significantly increased in the vertical pattern when compared with the horizontal pattern, ie, upper lip length (P &lt; .01), maxillary incisal display (P &lt; .001), interlabial gap (P &lt; .001), and change in upper lip length (P &lt; .001), whereas intercommisural width was significantly decreased in vertical pattern when compared with the horizontal pattern (P &lt; .001). Flat smile arc was seen more frequently in the horizontal pattern. Positive correlations were found between the N-Me, U1-PP, and change in upper lip length with vertical smile parameters. Conclusions: Different skeletal patterns exhibit their characteristic smile features. Upper lip length is not responsible for increased incisal display during smile. Increased incisal display during smile is more closely associated with upper lip elevation than vertical skeletal and dental factors.

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