scholarly journals Effects of repeated sterilization cycles on the surface alterations of ProTaper Next, TF Adaptive, HyFlex CM, and 2Shape instruments

2021 ◽  
Vol 15 (2) ◽  
pp. 76-81
Author(s):  
Olcay Özdemir ◽  
Sibel Koçak ◽  
Mustafa Murat Koçak ◽  
Baran Can Sağlam
Keyword(s):  
Statistical Significance ◽  
Three Dimensional ◽  
Maximum Height ◽  
Significance Level ◽  
Atomic Force ◽  
Surface Topographies ◽  
Superior Surface ◽  
Group 2 ◽  
Post Hoc ◽  
One Way Anova

Background. This study aimed to evaluate the effects of repeated sterilization cycles on the surface alterations of various nickel-titanium instruments, including ProTaper Next (PTN), TF Adaptive (TFA), HyFlex CM (HCM), and 2Shape (2S). Methods. Twenty-four new NiTi files of four different alloys were selected. The instruments in each group were divided into two equal groups, as follows: control and sterilization. The first group was chosen as the control without applying any sterilization procedure, while in group 2, five cycles of sterilization procedures were applied. The surface topographies were evaluated using scanning electron microscope (SEM) and atomic force microscope (AFM). The root mean square (RMS) and maximum height (MH) values and three-dimensional images were recorded. The data were analyzed with the Shapiro-Wilk test, one-way ANOVA, and post hoc Tukey tests. The statistical significance level was set at P≤0.05. Results. Before the experiment, HCM demonstrated the highest RMS value, and 2S showed the lowest. After the procedures, the RMS and MH values deteriorated on the surface of PTX, TFA, and 2S (P<0.001). The HCM was not affected by sterilization processes (P>0.05). Conclusion. The initial irregularity on the surface did not affect the rate of alteration. The HCM files demonstrated superior surface properties after several cycles of sterilization. The PTN, TFA, and 2S presented similar surface responses after five cycles of autoclave sterilization.

scholarly journals Selected Goal – Scoring Characteristics in the National Hockey League

2021 ◽  
Vol 61 (2) ◽  
pp. 228-237
Author(s):  
Silvio Parničan ◽  
Pavol Peráček ◽  
Igor Tóth
Keyword(s):  
Ice Hockey ◽  
National Hockey League ◽  
Training Process ◽  
Significance Level ◽  
Game Situation ◽  
Post Hoc ◽  
Number Of Passes ◽  
Determining Factor ◽  
One Way Anova ◽  
Location Zone

Summary The variables impacting the efficiency of the offensive phase of the game in ice hockey may be determining factor for both the training process and game strategies. The research aimed to acquire and expand the knowledge about selected goal-scoring characteristics in the National Hockey League. A total of 511 even-strength goals were recorded in 129 randomly selected games in a regular-season 2020/2021 by indirect observation. Goals were differentiated by selected variable dimensions: location of the offensive team’s puck possession gain before scoring a goal, game situation preceding a goal, and the number of passes of the offensive team preceding a goal. Data were analyzed by performing a one–way ANOVA. Post hoc multiple comparisons were performed using the Tukey HSD test. The significance level of p ≤ 0.05 was used. Significant differences were found within all variable dimensions (p= 0.00001). In terms of the puck possession gain location, zone 1 (along the boards in the offensive zone) was the zone with the significantly highest mean score (p= 0.00305). Offensive zone play was significantly the game situation preceding most of the goals (p= 0.00000). The interval of the passes that preceded most of the recorded goals was the interval of 1 – 2 passes (p= 0.00000). Acquired results point out the dominance of particular variables and may help coaches to determine the content of the training process and game strategies. Based on the assumption of the realization of similar research in different environments in terms of the quality and age category, if the analogy would be found between the results of the present study and the results of potential studies, we can state the trends applicable to youth training.

scholarly journals Evaluation of learning and memory effect of atorvastatin and simvastatin in alprazolam induced amnesia in mice

2018 ◽  
Vol 7 (10) ◽  
pp. 1900
Author(s):  
Shashikala G. ◽  
Jyothi C. H. ◽  
Shashikala G. H.
Keyword(s):  
Learning And Memory ◽  
Memory Effect ◽  
Elevated Plus Maze ◽  
Lipid Lowering ◽  
Standard Drug ◽  
Plus Maze ◽  
Group 2 ◽  
Evaluation Of Learning ◽  
Post Hoc ◽  
One Way Anova

Background: The study was undertaken to evaluate the learning and memory effect of lipid lowering drugs atorvastatin and simvastatin in alprazolam induced amnesic mice.Methods: The study was carried out on albino mice, divided into 4 groups of 6 animals each (either sex, 3-4 months of age, weight 25-30g). Amnesia was induced by administering Alprazolam (2mg/kg for 14 days) in all 4 groups from 1st to 14th day. In addition, group 2, 3 and 4 received Piracetam (400mg/kg), Atorvastatin (5mg/kg) and Simvastatin (5mg/kg) from 8th to 14th day respectively. The learning and memory of the animals was assessed by employing Elevated plus maze (EPM) and Step-down type passive avoidance (SDA) model.Results: Results were compared among the different groups using one way-ANOVA followed by post hoc Tukey’s test. The measured parameters were compared with standard drug Piracetam. In EPM model Atorvastatin (p<0.049) and Simvastatin (p<0.007) were comparable with standard drug Piracetam, whereas in SDA model only simvastatin group (p<0.001) showed significant result.Conclusions: In EPM model, both the statins showed significant improvement in learning and memory in alprazolam induced amnesic mice. However further studies are required to support these observations.

scholarly journals Influence of calcium hydroxide points on the quality of intracanal dressing filling

2006 ◽  
Vol 14 (3) ◽  
pp. 219-223 ◽  
Author(s):  
Nicole de Mello Rahde ◽  
José Antonio Poli Figueiredo ◽  
Elias Pandonor Motcy Oliveira
Keyword(s):  
Calcium Hydroxide ◽  
Root Canal Filling ◽  
Human Teeth ◽  
Significance Level ◽  
Root Canals ◽  
Gutta Percha ◽  
Group 2 ◽  
Post Hoc

PURPOSE: The aim of this study was to evaluate, in vitro, the quality of calcium hydroxide [Ca(OH)2] paste filling (Ultracal, Ultradent) associated or not with Ca(OH)2-containing gutta-percha points (Calcium Hydroxide Plus PointsTM, Roeko) in curved root canals. MATERIAL AND METHODS: One hundred and twenty roots of extracted human teeth, randomly divided into three curvature ranges (mild - 0 to 14º; moderate - 15º to 29º; severe - >30º) were used. After chemomechanical preparation, the roots were assigned to 4 groups (n=30), according to the technique of intracanal dressing placement: group 1 - Ca(OH)2 paste was applied with a lentulo spiral; group 2 - Ca(OH)2 paste was applied with a lentulo spiral and a Ca(OH)2 point was inserted into the canal; group 3 - Ca(OH)2 paste was applied with a NavitipTM tip (supplied with Ultracal system); group 4 - Ca(OH)2 paste was applied with a NavitipTM tip and a Ca(OH)2 point was inserted into the canal. The roots were cleared and the quality of apical third filling was assessed by a calibrated experienced examiner. The specimens were examined under stereomicroscopy and scored 1 to 4 (i.e., from inadequate to complete root canal filling). The results were analyzed statistically by ANOVA and Duncan's post hoc test at 5% significance level. RESULTS: There were no statistically significant differences (p>0.05) among the curvature degrees in groups 1, 3 and 4. Severely curved roots in group 2 presented bordering significance (p=0.05). The groups that associated the use of Ca(OH)2 paste and points (2 and 4) showed better apical filling than the other groups, but this difference was statistically significant (p<0.001) only for roots with severe curvature. CONCLUSION: According to the results of this study, the curvature degree did not influence the quality of filling. The techniques that used Ca(OH)2-containing gutta-percha points yielded better filling of the apical third in roots with severe curvature.

scholarly journals Intensity of Soccer Players’ Training Load in Small-Sided Games with Different Number of Players

2020 ◽  
Vol 60 (1) ◽  
pp. 55-74
Author(s):  
Nikolas Nagy ◽  
Miroslav Holienka ◽  
Matej Babic ◽  
Jakub Michálek ◽  
Egon Kunzmann
Keyword(s):  
Heart Rate ◽  
Statistical Significance ◽  
Soccer Players ◽  
Special Software ◽  
Systematic Training ◽  
The Difference ◽  
The One ◽  
Post Hoc ◽  
Experimental Group ◽  
One Way Anova

SummaryThe main aim of this research was to compare differences in heart rate values (HR) of soccer players during small-sided games (SSGs) with different number of players. We assumed that the number of “neutral” player or players in small-sided games will significantly affect the intensity of SSGs and in this case the heart rate values of participating players. The experimental group consisted of older junior players from the FC DAC 1904 Dunajská Streda soccer club (n = 9). The heart rate values were evaluated on the basis of collected data, which we obtained using Polar sport testers and special software Polar Team2. In order to find out the statistical significance of the difference in heart rate was used the One-Way ANOVA and the Bonferroni post hoc test. The level of statistical significance we set at 5 %. We found out that with increasing number of “neutral” players’ the intensity of small-sided games gradually decreased. During SSG1 (3 vs. 3), we recorded the highest achieved average heart rate values of the monitored players, in average 171.33 ± 9.39 beats.min-1. This form of the SSGs was the most intense, but not statistically significant. Our recommendation is to employ SSGs in the systematic training process with different number of players, because we can adequately prepare the players for the match load itself. Attention need to be paid for the playing position requirements.

scholarly journals Cervical Posture and Skeletal Malocclusions – Is there a Link?

2019 ◽  
Vol 15 (1) ◽  
pp. 5-9
Author(s):  
Sanam Tauheed ◽  
Attiya Shaikh ◽  
Mubassar Fida
Keyword(s):  
Statistical Significance ◽  
Class I ◽  
Class Iii ◽  
Weak Correlation ◽  
Pearson’S Correlation ◽  
Significance Level ◽  
Skeletal Class ◽  
Pearson's Correlation ◽  
One Way Anova ◽  
Cervical Posture

Background: The present study was conducted in order to determine cervical posture in different skeletal sagittal malocclusions as well as to assess whether a correlation existed between cervical posture and skeletal relationships. Methods: Cervical curvature and inclination of 63 subjects was assessed using their lateral cephalometric radiographs. Cervical inclination was assessed using the cervicohorizontal postural variables namely OPT/HOR and CVT/HOR whereas cervical curvature was determined by measuring the angle OPT/CVT. Sagittally, the subjects were also categorized into skeletal Class I, II and III based on the angle ANB. One way ANOVA was used for the comparison of cervical posture in different skeletal sagittal malocclusions. Pearson’s correlation was used to evaluate the correlation of cervical posture with different skeletal sagittal jaw relations. Statistical significance level was set at p≤0.05. Results: Statistically significant differences were found between the different skeletal malocclusions for the cervical curvature angle OPT/CVT (p=0.025). A weak correlation of cervical curvature angle OPT/CVT (r=0.305, p=0.016) with sagittal malocclusion was found.  Conclusions: Skeletal sagittal malocclusions differ in their cervical postures, especially  cervical curvature. Skeletal Class III subjects have significantly straighter cervical columns than skeletal Class I subjects. Cervical curvature is correlated with sagittal jaw relations.  Keywords: cervical curvature; cervical posture; skeletal sagittal malocclusions .  

scholarly journals MORPHOLOGICAL ADJUSTMENTS OF THE RADIAL NERVE ARE INTENSITY-DEPENDENT

2017 ◽  
Vol 23 (1) ◽  
pp. 55-59 ◽  
Author(s):  
Patrícia Oliva Carbone ◽  
Walter Krause Neto ◽  
Eliane Florencio Gama ◽  
Wellington de Assis Silva ◽  
Thatiana Lacerda Nobre ◽  
...  
Keyword(s):  
Radial Nerve ◽  
Morphological Analysis ◽  
Morphological Changes ◽  
The Other ◽  
Significance Level ◽  
Training Groups ◽  
Transmission Electron ◽  
Post Hoc ◽  
And Training ◽  
One Way Anova

ABSTRACT Introduction: Peripheral nerve adaptation is critical for strength gains. However, information about intensity effects on nerve morphology is scarce. Objective: To compare the effects of different intensities of resistance training on radial nerve structures. Methods: Rats were divided into three groups: control (GC), training with 50% (GF1) and training 75% (GF2) of the animal’s body weight. The morphological analysis of the nerve was done by light and transmission electron microscopy. One-way ANOVA and the Tukey’s post hoc test were applied and the significance level was set at p≤0.05. Results: Training groups had an increase of strength compared to GC (p≤0.05). All measured nerve components (mean area and diameter of myelin fibers and axons, mean area and thickness of the myelin sheath, and of neurofilaments and microtubules) were higher in GF2 compared to the other (p≤0.05). Conclusion: Results demonstrated greater morphological changes on radial nerve after heavier loads. This can be important for rehabilitation therapies, training, and progression.

scholarly journals Effect of Nanosilver Gel, Chlorhexidine Gluconate, and Camphorated Phenol on Enterococcus faecalis Biofilm

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Dong Bo ◽  
Cecilia Marcellino Kayombo
Keyword(s):  
Enterococcus Faecalis ◽  
Laser Scanning ◽  
Statistical Significance ◽  
Chlorhexidine Gluconate ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Control Analysis ◽  
Significant Difference ◽  
Post Hoc ◽  
One Way Anova

Aim. To assess the effectiveness of nanosilver gel (NSG) in comparison to chlorhexidine gluconate (CHX) and camphorated phenol (CP) against Enterococcus faecalis (E.f) biofilm. Methods and Materials. Two tests were done, methyl thiazolyl tetrazolium (MTT) assay and confocal laser scanning microscopy (CLSM) analysis, to determine the effectiveness of NSG, CHX, and CP on E.f biofilm. Polystyrene microtiter 96- and 6-well plates were used for MTT and CLSM, respectively. Nanosilver gel was in three concentrations (0.05%, 0.1%, and 0.2%), chlorhexidine gluconate used was 2%, and camphorated phenol and normal saline were as control. Analysis was done using one-way ANOVA; the post hoc test was run for multiple comparisons. The level of statistical significance was set at P<0.05. Results. One-way ANOVA showed significant differences among groups (0.05% NSG and CP, 0.1% NSG and CP, 0.2% NSG and CP, 0.1% NSG and 2% CHX, 0.2% and NSG and 2% CHX) (P<0.001) and also showed significant difference between groups (P<0.001), f-ratio 87.823. A post hoc Tukey’s test revealed no significant difference between chlorhexidine gluconate and 0.05% nanosilver gel (P>0.05). Conclusions. 0.1% and 0.2% nanosilver gel is more effective on Enterococcus faecalis biofilm as compared to chlorhexidine gluconate and camphorated phenol.

scholarly journals PENGARUH DURASI PEMAPARAN LARUTAN FLUORIDE DENGAN KONSENTRASI 0,15% TERHADAP PERUBAHAN KEKASARAN PERMUKAAN DENTIN

2018 ◽  
Vol 9 (2) ◽  
pp. 83-89
Author(s):  
Abdillah Imron Nasution ◽  
Ridha Andayani ◽  
Putri Disa Maulida
Keyword(s):  
Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Post Hoc ◽  
One Way Anova

Fluoride sering digunakan sebagai bahan aktif maupun bahan desensitisasi di dalam pasta gigi. Konsentrasi standar fluoride yang boleh terkandung dalam pasta gigi di Indonesia tidak boleh lebih dari 0,15% (1500 ppm). Terpaparnya fluoride dengan dentin dapat mendukung remineralisasi dengan stabilisasi hidroksiapatit. Tujuan penelitian ini adalah untuk melihat pengaruh durasi pemaparan fluoride dengan konsentrasi 0,15% terhadap perubahan kekasaran permukaan dentin. Atomic Force Microscopy digunakan untuk mengukur kekasaran permukaan dentin dan pengukuran selanjutnya menggunakan software Gwyddion v.2.30. Dua belas gigi premolar digunakan sebagai spesimen dan dipotong pada area mahkota dekat dengan cementoenamel junction kemudian permukaan dentin dihaluskan menggunakan SiC paper 600-grit. Spesimen dikelompokkan ke dalam 4 kelompok yaitu : Kontrol, Etsa, Fluoride 3 menit dan Fluoride 15 menit. Hasil dari penelitian menunjukkan bahwa nilai rata-rata kekasaran permukaan dentin dari yang tertinggi hingga terendah diawali pada kelompok : etsa (1.85±0.37 µm), k ontrol (1.76±0.32 µm), fluoride 3 menit (1.74±0.19 µm) dan f luoride 15 menit (1.62±0.37 µm). Hasil uji analisis statistik one-way ANOVA dan uji Post Hoc LSD menunjukkan tidak ada perbedaan yang signifikan pada tiap-tiap kelompok (p>0,05). Dapat disimpulkan bahwa durasi pemaparan larutan fluoride 0,15% belum mampu mengurangi kekasaran permukaan dentin secara signifikan.Kata kunci: Fluoride, kekasaran permukaan

scholarly journals Evaluation of Perception and Care in the Sanitation of Toothbrushes

2018 ◽  
Vol 20 (1) ◽  
pp. 20
Author(s):  
Beatriz Cavalcante Pereira ◽  
Gabriela Evangelista de Vasconcelos ◽  
Diala Aretha de Sousa Feitosa
Keyword(s):  
Descriptive Analysis ◽  
Dental Students ◽  
Significance Level ◽  
Adequate Information ◽  
The Subject ◽  
Knowledge And Practice ◽  
Post Hoc ◽  
And Storage ◽  
One Way Anova ◽  
The Ideal

As escovas dentais são contaminadas diariamente por bactérias presentes na cavidade oral ou no meio externo, por isso são consideradas depósitos de microorganismos, capazes de causar e transmitir doenças. O presente trabalho teve como objetivo avaliar o conhecimento e práticas quanto à higienização e armazenamento das escovas dentais, a fim de comparar ações executadas por grupos diferentes, e identificar falta de informações adequadas frente ao assunto. Os dados foram coletados através de questionários, em que foram avaliados três grupos experimentais: 1- Pacientes (n=50) atendidos no Sistema Único de Saúde (SUS), 2- Acadêmicos de Odontologia (n=50) do Centro Universitário Doutor Leāo Sampaio e 3- Cirurgiões-dentistas (n=50) de Juazeiro do Norte, Ceará. Foi realizada análise descritiva de distribuição de frequência, Anova 1 critério e teste post hoc de Bonferroni foram os testes utilizados, adotando-se um nível de significância de 5%. Na presente pesquisa, constatou-se que o grupo dos Cirurgiões-dentistas tem maior conhecimento e praticam melhores ações quanto às práticas de higienização das escovas dentais, superior ao grupo dos Acadêmicos e esses dos Pacientes. Porém, em relação ao armazenamento, os grupos demostraram não ter conhecimento acerca do local mais adequado e da maneira ideal para armazenar suas escovas. Conclui-se que, o grupo dos Cirurgiões-dentistas realiza a maior parte das manobras aconselháveis sobre os cuidados frente a higienização das escovas dentais relacionado aos outros grupos em questão, apesar de não ter conhecimento acerca de novas tecnologias para desinfecção das escovas.Palavras-chave: Contaminação. Escovação Dentária. Saúde Bucal.Abstract Toothbrushes are daily contaminated by bacteria in the oral cavity or outside, therefore they are considered containers for microorganisms, capable of causing and transmitting diseases. The current work aimed to evaluate the knowledge and practices regarding hygiene and storage of toothbrushes, in order to compare actions executed by different groups, and identify the lack of adequate information when facing the subject. Data were collected through a questionnaire, in which three experimental groups were evaluated: 1- patients (n=50) treated at Sistema Único de Saúde (SUS), 2- Dental students (n=50) from Centro Universitário Doutor Leão Sampaio and 3- Dental clinicians (n=50) from Juazeiro do Norte. A descriptive analysis of frequency distribution was performed, and One Way Anova and Bonfrerroni Post Hoc tests were performed, at a significance level of 5%. In the current research, it was found that the group of Dentists has a greater knowledge and practice better actions regarding the toothbrushes sanitation , higher than that of the group of Students, which was better that that of the group of Patients. However, regarding storage, the groups demonstrated to have not enough information regarding the adequate place and the ideal manner of storing their toothbrushes. It was concluded that, the group of Dentists performs the most part of recommended maneuvers regarding the care for toothbrushes hygiene compared to the other evaluated groups.Keywords: Contamination. Toothbrushing. Oral Health.

scholarly journals Effect of COVID-19 Pandemic on the Levels of Empathy among Undergraduate Dental Students in Pakistan

2020 ◽  
Vol 14 (S 01) ◽  
pp. S110-S115
Author(s):  
Sundas Ghaus ◽  
Madiha Abdul Waheed ◽  
Shahreen Zahid Khan ◽  
Laila Mustafa ◽  
Sohaib Siddique ◽  
...  
Keyword(s):  
Dental Students ◽  
Cross Sectional Survey ◽  
Chi Square ◽  
Cross Sectional ◽  
Significance Level ◽  
Significant Difference ◽  
Chi Square Test ◽  
Post Hoc ◽  
The Impact ◽  
One Way Anova

Abstract Objective The purpose of our study is to determine the effect of coronavirus disease 2019 (COVID-19) on the levels of empathy toward patients among undergraduate dental students in Pakistan. Materials and Methods A cross-sectional, survey-based study was conducted at Islamic International Dental College, Islamabad, Pakistan. After taking an informed consent, a validated and pretested Toronto Empathy Questionnaire (TEQ) was distributed amongst the undergraduate dental students at two points, one before the COVID-19 existed, and the other after August 7th, 2020, when the COVID-19 cases dropped in Pakistan. Responses were indicated on a five point Likert Scale. Statistical Analysis A one-way ANOVA (analysis of variance) was used to compare the TEQ scores between the different years of education at the dental school. Difference within the groups was analyzed using the post-hoc Tukey test. Pre- and post-COVID-19 comparison was done using the Chi-square test (significance level p < 0.05). Results A total of 221 out of 260 students in the pre-COVID-19 group, while 210 out of 260 students in the post-COVID-19 group enrolled in the dentistry program participated in the study. Significant difference in the empathy levels was observed in the pre- and post-COVID-19 groups of the same population, i.e., (p < 0.05). The response rate was 85%. Conclusions This study showed an increase in mean empathy scores among the undergraduate dental students after COVID-19, indicating a significant improvement in their empathy levels during the time of COVID-19. It highlights the impact of the pandemic, whereby death and chaos seem to have brought about an improvement in interpersonal harmony.

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