scholarly journals Comparison of Screw-In Forces during Movement of Endodontic Files with Different Geometries, Alloys, and Kinetics

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1506 ◽  
Author(s):  
Sang Won Kwak ◽  
Chan-Joo Lee ◽  
Sung Kyo Kim ◽  
Hyeon-Cheol Kim ◽  
Jung-Hong Ha
Keyword(s):  
Rotation Speed ◽  
Nickel Titanium ◽  
Sectional Area ◽  
Cross Sectional ◽  
Significance Level ◽  
Contact Points ◽  
Heat Treated ◽  
Working Length ◽  
Post Hoc ◽  
One Way Anova

This study compared the maximum screw-in forces of various instruments during their movements. Forty simulated canals in resin blocks were randomly divided into four groups (n = 10): ProTaper Universal F2, ProTaper Gold F2, WaveOne Primary, and WaveOne Gold Primary. To standardize a lumen size, all artificial canals were prepared with ProTaper Universal F1. The rotation speed was set at 350 rpm with an automated 4 mm pecking motion at a speed of 1 mm/s. The pecking depth was increased by 1 mm for each pecking motion until the file reached the working length. During instrumentation, screw-in forces were automatically recorded by customized software. Maximum screw-in forces were analyzed by one-way ANOVA and Tukey’s post hoc comparison with the significance level at 0.05. WaveOne Gold files generated the lowest maximum screw-in forces, followed by ProTaper Gold, WaveOne, and ProTaper Universal (p < 0.05). Under the condition of this study, heat-treated nickel–titanium (NiTi) files with smaller cross-sectional area, fewer contact points, and reciprocating movements resulted in a lower screw-in effect.

scholarly journals Effective Establishment of Glide-Path to Reduce Torsional Stress during Nickel-Titanium Rotary Instrumentation

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 493 ◽  
Author(s):  
Ibrahim H Abu Tahun ◽  
Sang Won Kwak ◽  
Jung-Hong Ha ◽  
Asgeir Sigurdsson ◽  
Mehmet Baybora Kayahan ◽  
...  
Keyword(s):  
Nickel Titanium ◽  
Stress Generation ◽  
Total Stress ◽  
Significance Level ◽  
Glide Path ◽  
Working Length ◽  
Canal Shaping ◽  
The One ◽  
Data Acquisition Module ◽  
Post Hoc

This study compared the torque generation during canal shaping with a nickel-titanium endodontic instrument according to the extent of glide-path establishment. Seventy-five simulated S-shaped canal blocks were divided into five groups (n = 15) according to the number of repetitive insertions to the working length using a One G glide-path instrument: groups with 5, 10, 15, and 20 insertions as well as group Z without glide-path establishment. When the tip of the One G file reached the working length, the file was moved back and forth repetitively at the working length for the designated number of times for each group. The instrumentation procedure with HyFlex EDM had 15 pecking strokes. During instrumentation, the generated torque was transmitted to a customized data acquisition module and collected using customized software. Data were computed to determine the maximum torque and total stress. The maximum screw-in forces were statistically analyzed using one-way analysis of variance and Tukey’s post hoc comparison test with a significance level of 95%. While the maximum stress did not have significant differences among the five groups (p > 0.05), groups with more than 10 repetitive insertions generated lower total stress during instrumentation than did the group with 5 insertions and group Z (p < 0.05). Under the limitations of this study, repetitive insertions of glide-path establishment files at the working length reduced stress generation during the shaping using nickel-titanium instruments.

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.

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 Effect of Core Mass and Alloy on Cyclic Fatigue Resistance of Different Nickel-Titanium Endodontic Instruments in Matching Artificial Canals

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5734
Author(s):  
Sebastian Bürklein ◽  
Lennart Zupanc ◽  
David Donnermeyer ◽  
Karsten Tegtmeyer ◽  
Edgar Schäfer
Keyword(s):  
Fatigue Resistance ◽  
Cyclic Fatigue ◽  
Nickel Titanium ◽  
The Other ◽  
Design Parameters ◽  
Core Mass ◽  
Cross Sectional ◽  
Significance Level ◽  
Cross Sectional Design ◽  
The Impact

Instrument failure during root canal preparation is still a concern among endodontists. However, it remains unclear whether the use of more martensitic alloys or the cross-sectional design parameters (i.e., core mass) significantly improve fracture resistance. The aim of the study was to evaluate the impact of core mass and alloy on dynamic cyclic fatigue resistance of nickel-titanium endodontic instruments in matching artificial canals at body temperature. Two groups were tested. (A) taper 0.04: F360 (Komet, Lemgo, Germany), Twisted file (Sybron Endo, Glendora, CA, USA) (=TF), JIZAI (Mani, Tochigi, Japan) (=J_04) (all size #25) and the variable tapered TruNatomy (Dentsply, Ballaigues, Switzerland) (size #26) (=TN). (B) size #25; taper 0.06: (Mtwo (VDW, Munich, Germany), JIZAI (Mani) (=J_06), and variable tapered Hyflex EDM OneFile (Coltene Whaledent, Altstätten, Switzerland) (=HF). Time, number of cycles to fracture (NCF), and number and length of fractured fragments were recorded and statistically analysed using ANOVA Student-Newman-Keuls, Kruskal–Wallis or Chi-square test (significance level = 0.05). (A) TN showed the significantly shortest time until fracture, followed by TF, F360 and J_04 which also differed significantly, while NCF showed the following order: F360 < TN < TF < J_04 (p < 0.05). Only one J_04 but all instruments of the other groups fractured within the test-limit of 10 min. (B) Mtwo was significantly inferior concerning time until fracture and NCF, compared to J_06 and HF (p < 0.05), which did not differ significantly (p > 0.05). While all Mtwo instruments fractured, only four instruments failed in the other groups (p < 0.05). Within the limitations of this study, alloy and cross-sectional design (i.e., core mass) were critical factors regarding instrument failure, but none of these factors could be determined as a main parameter for increased or decreased time, and cycles to fracture. Rather, it seemed to be the interaction of multiple factors (e.g., longitudinal and cross-sectional design, alloy, and rotational speed) that was responsible for differences in the time and cycles to fracture. Nonetheless, all instruments had lifetimes that allow safe clinical use. However, the superiority or inferiority of an instrument with regard to cyclic fatigue based on laboratory results—even when identical trajectories are guaranteed—may be considered questionable, as the characteristics and design parameters of the instruments vary considerably, and the experimental setups lack additional clinical parameters and thus clinical relevance.

scholarly journals Serum Interleukin-2 (IL-2) Levels in Untreated and Treated in Batak Tribe Patients with Schizophrenia

2021 ◽  
Vol 4 (1) ◽  
pp. 1449-1460
Author(s):  
Julius Martin Siagian ◽  
Elmeida Effendy ◽  
Mustafa M. Amin
Keyword(s):  
General Hospital ◽  
Pearson Correlation ◽  
Interleukin 2 ◽  
Cross Sectional ◽  
Welch Test ◽  
Pearson Correlation Test ◽  
Healthy Control ◽  
The Difference ◽  
Post Hoc ◽  
One Way Anova

To find out the difference of serum IL-2 levels between untreated and treated in the Batak tribe patients with schizophrenia and healthy control and also to find out the association between serum IL-2 levels with PANSS score in the Batak tribe patients with schizophrenia. This study was cross-sectional approach using a one-way ANOVA welch test and to find a correlation between serum IL-2 levels with PANSS score in the Batak tribe patients with schizophrenia which is conducted in Prof. Dr. M. Ildrem Psychiatric Hospital Medan and Dr. Pirngadi General Hospital Medan from September 2019-November 2019. Subjects of untreated were 55 subjects and treated in the Batak tribe patients with schizophrenia were 55 subjects and healthy control were 55 subjects. There were significant differences between these three groups using post hoc Games-Howell test on the value of p<0.001 and also been found there was a significant correlation between serum IL-2 levels with PANSS score in the Batak tribe patients with schizophrenia using the Pearson correlation test (r=0.599, p=0.001 and r=0.501, p=0.001). It was founded that there were significant differences between serum IL-2 levels in three groups and also founded there was a significant correlation between serum IL-2 levels with PANSS score in the Batak tribe patients with schizophrenia. 

scholarly journals Evaluation of Dental Anxiety and Fear in Patients who Admitted to the Faculty of Dentistry: Which Patients are More Risky in terms of Dental Anxiety.

1970 ◽  
Vol 29 (6) ◽  
Author(s):  
Burkay YAKAR ◽  
Türkkan Öztürk KAYGUSUZ ◽  
Edibe PİRİNÇCİ
Keyword(s):  
Dental Treatment ◽  
Dental Health ◽  
Dental Anxiety ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Factors Affecting ◽  
Post Hoc ◽  
One Way Anova ◽  
Anxiety And Fear ◽  
Dental Appointments

Background: Dental anxiety and fear make the dental operation and the treatment difficult. Beside that it causes the delays or absence in the dental appointments so it leads to problems for oral and dental health. The aim of this study was to investigate the frequency of dental anxiety, the factors affecting dental anxiety and the effects of dental anxiety on oral dental health of the participants.Methodology: We conducted a hospital-based, cross-sectional study among 342 patients attending the outpatient clinic of a tertiary dentistry hospital. Dental anxiety and trait anxiety levels of the participants measured using MDAS and STAI scales. Weconducted the student t-test, One-way Anova and Tukey’s post hoc for the analysis of our data. The Pearson’s correlation analysis has been used for the analysis of two different quantitative data obtain from MDAS and STAI scales.Results: The age average of 342 participant of our research was 34,41±11,78. 59,1% of our participants was women. (n=202) Dental anxiety was existing in the 42,1% of the participants (n=144). 56,4% of the participants have had a hard and painful dental treatment experiences. 15,2% of our participants (n=52) had MDAS 19 point or more.Conclusions: High and statistically significant dental anxiety scores have been detected for the patients who are women, housewives, who had uneasy and painful dental treatment stories who have personel inclinations to the anxiety. Examinations directed to the factors which would increase the dental anxiety, may prevent possible complications and also the risk carried by the patients related to the dental health may be estimated with the help of this kind of examinations. 

scholarly journals Resistance to Cyclic Fatigue of Nickel-Titanium Files Immersed in Sodium Hypochlorite at Body Temperature

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Hind F. Abuhulaibah ◽  
Ammar AbuMostafa
Keyword(s):  
Stainless Steel ◽  
Body Temperature ◽  
Sodium Hypochlorite ◽  
Cyclic Fatigue ◽  
Nickel Titanium ◽  
Control Group ◽  
Significant Drop ◽  
Number Of Cycles ◽  
Post Hoc ◽  
One Way Anova

Background/purpose. To assess the resistance to cyclic fatigue (CF) displayed by two nickel-titanium (NiTi) files, One Curve (OC) and ProTaper Gold (PTG), after their immersion in 2.5% sodium hypochlorite (NaOCl) solution at body temperature. Materials and Methods. Forty-five files from each brand were randomly assigned to three groups (n = 15) and subjected to the following: no immersion (control), 1-minute immersion, and 5-minute immersion in 2.5% NaOCl at 37°C. CF for all the files was tested within a well-lubricated stainless-steel artificial canal in a water bath at 37°C simulating body temperature. The procedure was video recorded, and the number of cycles to fracture (NCF) was calculated by multiplying the time taken to fracture, with the number of rotations per second. The data were analyzed for normality, and thereafter, one-way ANOVA with multiple Bonferroni was used as the post hoc test. Results. The resistance to CF of OC files was significantly higher than PTG files in all groups. In groups immersed in NaOCl for one minute, OC files showed significant drop in the CF resistance; PTG files showed a drop as well but not significantly. Both files demonstrated a significant drop in resistance to CF after immersion in NaOCl for five minutes compared to the control group. Conclusion. OC files were significantly more resistant to CF compared to PTG in all groups. Immersion in 2.5% NaOCl for 5 minutes significantly reduced the resistance to CF for all the files.

scholarly journals Total Energy and Macronutrient Intakes in Masters Athletes

2021 ◽  
Vol 5 (Supplement_2) ◽  
pp. 1296-1296
Author(s):  
Quentin Nichols ◽  
Rohit Ramadoss ◽  
Stella Volpe
Keyword(s):  
Total Energy ◽  
A Priori ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Significance Level ◽  
Funding Sources ◽  
Masters Athletes ◽  
Different Types ◽  
Study Participants ◽  
Post Hoc

Abstract Objectives Athletes subscribe to different energy and macronutrient intakes based on the needs of the sport. The aim of our study was to evaluate total energy and macronutrient intakes between different types of Masters athletes. Methods Female and male Masters athletes participated in this cross-sectional study. Dietary consumption data were measured using Block's 2005 Food Frequency Questionnaire. A one-way analysis of variance was used to compare total energy, protein, carbohydrate, and fat (in grams [g]) intakes among the athletes. When significant differences were found, a Fisher's LSD post hoc test was performed to identify specific group differences. The significance level was set a priori at P &lt; 0.05. Results A total of 330 athletes (182 women and 148 men) were included in the study. Participants were 36.55 ± 11.2 years of age. The athlete population consisted of general athletes (n = 81), runners (n = 116), triathletes (n = 53), rowers (n = 46), and CrossFit athletes (n = 34). Runners (1941.35 ± 697.25 kilocolaries [kcal]), triathletes (2031.65 ± 912.02 kcal), and rowers (2004.15 ± 978.42 kcal) all had significantly greater total energy intakes compared to CrossFit athletes (1538.80 ± 491.74 kcal) (P &lt; 0.05). Runners (226.21 ± 89.67 g) and triathletes (235.43 ± 134.29 g) had significantly greater carbohydrate intakes compared to CrossFit athletes (162.93 ± 66.99 g) (P &lt; 0.05). Rowers (83.31 ± 44.74 g) had a significantly greater protein intake compared to CrossFit athletes (64.77 ± 21.32 g) (P = 0.027). Rowers (87.35 ± 45.91 g) had a significantly greater fat intake compared to CrossFit athletes (68.86 ± 25.10 g) (P = 0.041). Conclusions Based on our data, runners, triathletes, and rowers all had greater total energy intake compared to CrossFit athletes. Rowers also consumed significantly more protein and fat than CrossFit athletes. Rowers may consume more protein and fat due to the combination of endurance and strength needed to meet the demands of the sport. Further research is needed to continue evaluating total energy and macronutrient intakes between different types of Masters athletes. Funding Sources This project was unfunded.

scholarly journals EKSPRESI INTERLEUKIN-1 (IL-1) Β PADA ENDOMETRIOSIS, KARSINOMA ENDOMETRIOID DAN KARSINOMA SEROSUM OVARIUM

Biomedika ◽  
2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Nadia Nur Lestari ◽  
Siti Amarwati ◽  
Udadi Sadhana ◽  
Dik Puspasari
Keyword(s):  
Interleukin 1 ◽  
Interleukin 1Β ◽  
Cross Sectional ◽  
Cross Sectional Design ◽  
Post Hoc ◽  
One Way Anova

Endometriosis ovarium memiliki resiko keganasan epithelial ovarium (resiko relatif 1.9 sampai 4.2). Karsinoma endometrioid adalah salah satu jenis keganasan yang paling sering berhubungan dengan endometriosis, sementara karsinoma serosum merupakan keganasan epitelial terbanyak pada ovarium.Serum sitokin pro-inflamasi interleukin-1 (IL-1) β telah ditemukan berperan pada endometriosis dan karsinogenesis.Penelitian Keita, 2010, menemukan bahwa karsinoma endometrioid memiliki kadar IL-1β yang lebih tinggi secara bermakna dibandingkan jenis lainnya. Penelitian ini bertujua untuk mengetahui perbedaan ekspresi IL-1β pada jaringan endometriosis, karsinoma endometrioid dan karsinoma serosum ovarium. Desain penelitian ini adalah cross sectional design. Sampel adalah tiga puluh 33 blok parafin yang telah didiagnosis dan dire-evaluasi sebagai endometriosis (kelompok A), karsinoma endometrioid (kelompok B) dan karsinoma serosum ovarium (kelompok C) dan dilakukan pemeriksaan imunohistokimia IL-1β. Data ekspresi IL-1β dianalisis uji One Way ANOVA, dilanjutkan dengan uji beda rerata Post Hoc. Hasil uji One Way ANOVA kelompok A, B dan C, p = 0,037, menunjukkan adanya perbedaan bermakna. Uji beda rerata Post Hoc didapatkan kelompok A vs kelompok B dan C (p = 0,034 dan p = 0,020) bermakna. Sedangkan kelompok B vs kelompok C (p =0,805) tidak bermakna. Dari penelitian ini dapat disimpulkan terdapatperbedaan yang bermakna ekspresi IL-1β antara endometriosis dengan karsinoma endometrioid dan karsinoma serosum ovarium, namun tidak terdapat perbedaan yang bermakna ekspresi IL-1β antara karsinoma endometrioid ovarium dan karsinoma serosum ovarium.Kata kunci: Endometriosis, interleukin-1β, karsinoma endometrioid, karsinoma serosum

scholarly journals A comparison of balance and leg muscle strength between tai chi and yoga in older adults: A cross-sectional study

2021 ◽  
Vol 13 (3) ◽  
pp. 71-77
Author(s):  
MENTARI A. JELITA ◽  
JULIA R. TANJUNG ◽  
IGNATIO R. HARYONO ◽  
NAWANTO A. PRASTOWO
Keyword(s):  
Muscle Strength ◽  
Tai Chi ◽  
Cross Sectional Study ◽  
Elderly Persons ◽  
Cross Sectional ◽  
Leg Muscle ◽  
The Difference ◽  
Post Hoc ◽  
And Control ◽  
One Way Anova

Background: There is increasing evidence that practicing tai chi or yoga can improve the elderly’s physical performance. This study aimed to compare the effects of tai chi and yoga on balance and leg muscle strength in the elderly. Material & Methods: This cross-sectional study involved 90 elderly persons who practice tai chi (n = 36), yoga (n = 23), and a control group (n = 31). The balance function was assessed using the single-leg stance (SLS) test, while leg muscle strength (LMS) was assessed using a leg-back dynamometer. A Chi-square, Spearman rank test, one-way ANOVA with LSD post hoc were applied. The significance was set at p<0.05. Results: One-way ANOVA showed a difference in LMS and SLS between groups (p<0.01). LSD post hoc analysis found the difference in LMS between tai chi and yoga (64.3 vs. 41.5, p<0.01) and tai chi and control (64.3 vs. 30.4, p<0.01). The difference was also found in SLS between tai chi and control (36.7 vs. 6.2, p<0.01) and between yoga and control (41.4 vs. 6.2, p<0.01). Conclusion: Elderly persons who participated in tai chi and yoga demonstrated higher LMS and SLS performance than the sedentary participants. The tai chi group showed better muscle strength than the yoga group.

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