scholarly journals Assessment of Real-Time Operative Torque during Nickel–Titanium Instrumentation with Different Lubricants

2020 ◽  
Vol 10 (18) ◽  
pp. 6201 ◽  
Author(s):  
Alessandro Mazzoni ◽  
Andrea Pacifici ◽  
Alessio Zanza ◽  
Andrea Del Giudice ◽  
Rodolfo Reda ◽  
...  
Keyword(s):  
Real Time ◽  
Ex Vivo ◽  
Peak Torque ◽  
Sample Mean ◽  
Group A ◽  
Torsional Loads ◽  
Group B ◽  
Post Hoc ◽  
Group D

The aim of the present study is twofold: to assess ex vivo the role of different lubricants on real-time torque generated during intracanal instrumentation and to check whether two different kinds of torque parameters, operative torque (OT) and average peak torque (APT), could produce similar results. Forty extracted single-rooted teeth were selected for the present study and divided into four equal groups (n = 10): Group A, NaCl 0.2%; Group B, NaOCl 5%; Group C, ethylenediaminetetraacetate (EDTA), and Group D, EDTA and hydrogen peroxide. Afterwards, Edge Taper F2 (Edge Endo, Albuquerque, New Mexico) were rotated clockwise at 300 rpm with 3 Ncm maximum torque by an endodontic torque recording motor. In each sample, mean OT and mean APT were recorded and statistically analyzed with one-way ANOVA and a post hoc Bonferroni between groups (p < 0.05). EDTA (12.11 ± 4.45 Ncm) showed statistically significant (p < 0.05) lower values compared with the other tested irrigant for both parameters. Overall, the two different parameters were both able to differentiate between the influence of lubricants on torsional loads.

Histopathological analysis of incompetent great saphenous veins after mechanochemical ablation treatment – An ex-vivo experiment

Vascular ◽  
2021 ◽  
pp. 170853812110076
Author(s):  
Bo Yang ◽  
Qiang-Qiang Nie ◽  
Xue-Qiang Fan ◽  
Jian-Bin Zhang ◽  
Peng Liu
Keyword(s):  
Ex Vivo ◽  
Endothelial Damage ◽  
Statistical Result ◽  
Histopathological Analysis ◽  
Saphenous Veins ◽  
Mechanochemical Ablation ◽  
Group A ◽  
Endothelium Damage ◽  
Group B ◽  
Group D

Background The endovascular technique of mechanochemical ablation (MOCA) has become popular in treating patients with saphenous reflux. We reported the histopathological findings in human ex-vivo incompetent great saphenous veins following treatment with saline, polidocanol, mechanical ablation and MOCA using ClariVein device. Methods Twenty-four vein GSV specimens were obtained via traditional surgery and treated with four methods: Group A: 0.9% normal saline (NS); Group B: 3% polidocanol; Group C: mechanical ablation + 0.9% NS; Group D: mechanical ablation + 3% polidocanol (MOCA). Hematoxylin and eosin (HE), Masson’s trichrome and immunohistochemical staining were performed on each specimen and integrated optical densities were measured with vWF and a-SMA stains and statistically evaluated. vWF staining was used to assess endothelial damage and a a-SMA staining was used to assess media injury. Results HE and Masson’s trichrome staining of Groups C and D revealed severe damage to the endothelium and media compared to Groups A and B. The statistical result of vWF staining showed the damage of endothelium was significantly increased by Group D compared to Groups A, B and C. The statistical result of a-SMA staining showed the damage of media was significantly increased by Groups C and D compared to Groups A and B. Conclusions The mechanism of MOCA was caused by both endothelium damage and media tearing. The damage of endothelium was significantly increased by MOCA when compared with mechanical ablation alone.

scholarly journals Effect of Delayed Light-Curing Through a Zirconia Disc on Microhardness and Fracture Toughness of Two Types of Dual-Cure Cement

2019 ◽  
Author(s):  
Pouran Samimi ◽  
Sara Kaveh ◽  
Maryam Khoroushi
Keyword(s):  
Fracture Toughness ◽  
Delay Group ◽  
Fracture Toughness Test ◽  
Irradiation Group ◽  
Significant Difference ◽  
Group A ◽  
Light Curing ◽  
Group B ◽  
Post Hoc ◽  
Group D

Objectives: Photopolymerization immediately sets dual-cure cements and prevents the continuation of chemical polymerization. Delayed light-curing allows the chemical process to continue up to the point before starting irradiation; however, there is a controversy in this respect. The present study evaluates the effect of delayed light-curing through a zirconia disc on the microhardness and fracture toughness (KIC) of two types of dual-cure cement. Materials and Methods: Samples measuring 25×5×3 mm3 were prepared for fracture toughness test, and discs measuring 5 mm in diameter and 3 mm in thickness were prepared for microhardness test using Bifix and BisCem cements. Light-curing protocols were as follows: immediate light-curing (group A), a 2-minute delay (group B), a 5-minute delay (group C), direct irradiation (group D), and no irradiation (group E). In groups A to C, light-curing was carried out through a zirconia disc. Data were analyzed by two-way and one-way analysis of variance (ANOVA), post-hoc Tukey's test, and Kruskal-Wallis test at 95% confidence interval. Results: There was a significant difference in the microhardness of the cements (P=0.00). Delayed light-curing had no effect on microhardness (P=0.080). The microhardness of BisCem in group E was significantly lower than that in group D (P=0.015). The fracture toughness of Bifix in groups B and C was significantly different than that in group E and BisCem groups. Conclusions: Under the limitations of our study, delayed light-curing had different effects on microhardness and fracture toughness. Differences in light-curing protocols resulted in different effects based on the cement type. Light-curing is recommended to achieve optimal mechanical properties.

The entrainment role of photoperiod on hypoosmoregulatory and growth-related aspects of smolting in Atlantic salmon (Salmo salar)

1990 ◽  
Vol 68 (4) ◽  
pp. 707-715 ◽  
Author(s):  
James Duston ◽  
Richard L. Saunders
Keyword(s):  
Salinity Tolerance ◽  
Condition Factor ◽  
Plasma Osmolality ◽  
Natural Photoperiod ◽  
Group A ◽  
Challenge Tests ◽  
Subsequent Loss ◽  
Group B ◽  
Group D

Potential yearling (1+) smolts were maintained under 8.25 h light: 15.75 h dark and constant temperature (10.0 °C) from late December. Groups were subjected to an abrupt increase to 16 h light: 8 h dark on December 31 (group A), February 1 (group B), March 1 (group C), or March 31 (group D). Group E was maintained under constant 8.25 h light: 15.75 h dark for the duration of the experiment and group LDN was maintained under a simulated natural photoperiod cycle (45°N). Plasma osmolality levels following 24-h, 29‰ salinity challenge tests indicated a photoperiod-independent development of hypoosmoregulatory mechanisms preceding completion of smoltification that was significantly correlated with fish body size. As judged by 96-h, 37.5‰ salinity tolerance tests and changes in condition factor, completion of smolting occurred in sequence; in groups A and B it was advanced to late February, while groups C and D completed smolting in mid-March and mid-April, respectively, compared with late May for group LDN. Group E, maintained under constant 8.25 h light: 15.75 h dark, developed salinity tolerance in late May, but unlike other groups exhibited no large reduction in condition factor. Following smolting, an increase in condition factor and a loss of salinity tolerance occurred in all groups. The results support the hypothesis that changes in photoperiod entrain an endogenous circannual rhythm involved in controlling the completion of smoltification and subsequent loss of some smolt characteristics.

scholarly journals The Effect of Bone Marrow Mesenchymal Stem Cells Application on Distracted Bone Quality during Rapid Rate of Distraction Osteogenesis

2018 ◽  
Vol 11 (3) ◽  
pp. 192-198
Author(s):  
Marwa El Kassaby ◽  
Khaled Abd El Kader ◽  
Nahed Khamis ◽  
Alaa Al Hammoud ◽  
Alaa Ben Talb ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Bone Quality ◽  
Distraction Osteogenesis ◽  
Rapid Rate ◽  
Marrow Mesenchymal Stem Cells ◽  
Group A ◽  
Group B ◽  
Post Hoc ◽  
Group D

Distraction osteogenesis (DO) bone regenerate usually suffers from an inferior quality especially with rapid rate. This study was conducted to investigate the effect of mesenchymal stem cells (MSCs) application on different rates of distraction bone quality. Twenty-four goats were divided into group A with standard DO and group B with rapid distraction osteogenesis (RDO) both aided by MSCs. Group C with standard DO and group (D) with RDO were controls. Kruskal–Wallis test and Conover's post hoc analysis was used to evaluate significance ( p = 0.05). Histomorphometry showed a strongly significant (SS) increase ( p = 0.00036) in trabecular bone (TB) in group A (TB = 174.7 μm, SD = 33.5) and group B (TB = 166.8 μm, SD = 14) compared with group C (TB = 115.4 μm, SD = 19.6) and group D (TB = 86.1 μm, SD = 9.3). There was SS decrease ( p = 0.00093) in osteoid percentage (OP) in group A (OP = 13.4%, SD = 2) and group B (OP = 11.5%, SD = 6.5) compared with group C (OP = 27.3, SD = 3.5) and group D (OP = 26.2%, SD = 2.6). Energy dispersive X-ray showed a nonsignificant increase ( p = 0.11) in calcification (Ca2+%) in group A (Ca2+% = 17.6%, SD = 4.9) and group B (Ca2+% = 17.6%, SD = 4.3) compared with group C (Ca2+ % = 14.2%, SD = 6.7) and group D (Ca2+% = 11.5%, SD = 2.4). MSCs application improved microscopic bone quality during standard DO and RDO. However, macroscopic bone quality improvement still needs further investigation.

scholarly journals Erosive potential of three different commonly used pediatric syrups on deciduous teeth enamel: an in vitro study

2020 ◽  
Vol 7 (10) ◽  
pp. 2041
Author(s):  
Neha Thilak ◽  
Sundeep K. Hedge ◽  
Sham S. Bhat
Keyword(s):  
In Vitro Study ◽  
Titratable Acidity ◽  
Deciduous Teeth ◽  
Hardness Tester ◽  
Titrable Acidity ◽  
Group A ◽  
Group B ◽  
Post Hoc ◽  
Group D

Background: The aim of the study is to compare the erosive potential of three different commonly used pediatric syrups on deciduous teeth enamel. The objectives of the study were to assess the endogeneous pH and titratable acidity of mefenamic acid syrup (meftal P), cetrizine syrup (alerid) and multivitamin syrup (zincovit) and to evaluate the microhardness of the enamel after successive immersion cycles in each of the syrups.Methods: 40 non carious deciduous teeth were included for the study The samples were then randomly allocated into 4 groups (10 in each group): Group A- mefenemic acid syrup (meftal P), Group B- cetrizine syrup (alerid), group C- multivitamin syrup (zincovit) and group D- control (distilled water). The samples were then subjected to the immersion cycles in the syrups. Assessment of enamel surface microhardness was done using Vickers hardness tester at 7th day and 14th day. The pH and titrable acidity of the syrups were also assessed. One way analysis of variance (ANOVA) and post hoc tests were used for the statistical analysis.Results: Out of the test groups, group C showed the lowest pH of around 4.2 and exhibited the largest titrable acidity (22.8 ml) compared with 21 ml in group A and 15.5 ml in group B. At the end of 14th day, group A had microhardness of about 293.43.84±6.34, group B had 299.930±6.85, group C had 313.380±6.23 and group D had 334.190±5.51.Conclusions: All the pediatric liquid medications assessed in the study, meftal P, alerid and zincovit showed acidic pH, high titrable acidities and all the syrups showed loss of microhardness after exposure to the syrups for 14 days. Loss of microhardness was highest for meftal P followed by alerid and least for zincovit.

The Role of Xylitol Gum Chewing in Restoring Postoperative Bowel Activity After Cesarean Section

2015 ◽  
Vol 18 (2) ◽  
pp. 167-172 ◽  
Author(s):  
Jian Tao Lee ◽  
Mei-Hui Hsieh ◽  
Po-Jen Cheng ◽  
Jr-Rung Lin
Keyword(s):  
Cesarean Section ◽  
Chewing Gum ◽  
Control Group ◽  
Bowel Sounds ◽  
Gum Chewing ◽  
Group A ◽  
The Times ◽  
Group B ◽  
Post Hoc

Aims: The goal of this study was to evaluate the effects of xylitol gum chewing on gastrointestinal recovery after cesarean section. Methods: Women who underwent cesarean section ( N = 120) were randomly allocated into Group A (xylitol gum), Group B (nonxylitol gum), or the control group (no chewing gum). Every 2 hr post-cesarean section and until first flatus, Groups A and B received two pellets of chewing gum and were asked to chew for 15 min. The times to first bowel sounds, first flatus, and first defecation were then compared among the three groups. Results: Group A had the shortest mean time to first bowel sounds (6.9 ± 1.7 hr), followed by Group B (8 ± 1.6 hr) and the control group (12.8 ± 2.5 hr; one-way analysis of variance, p < .001; Scheffe’s post hoc comparisons, p < .05). The gum-chewing groups demonstrated a faster return of flatus than the control group did ( p < .001), but the time to flatus did not differ significantly between the gum-chewing groups. Additionally, the differences in the time to first defecation were not significant. Conclusion: After cesarean section, chewing gum increased participants’ return of bowel activity, as measured by the appearance of bowel sounds and the passage of flatus. In this context, xylitol-containing gum may be superior to xylitol-free gum.

Analyzing thoracic cavity gas during pneumothorax treatment to monitor the pneumothorax conditions in real time for updating the treatment strategy: A pilot study

TECHNOLOGY ◽  
2015 ◽  
Vol 03 (04) ◽  
pp. 189-193
Author(s):  
Hui Ma ◽  
Wei Jia ◽  
Yuechuan Li
Keyword(s):  
Real Time ◽  
Treatment Strategy ◽  
Tension Pneumothorax ◽  
Thoracic Cavity ◽  
Analysis Group ◽  
Partial Pressures ◽  
Group A ◽  
Group B ◽  
Cure Rates ◽  
Group D

ObjectivesTo monitor the pneumothorax conditions in real time by analyzing thoracic cavity gas during pneumothorax treatment, and provide instructions for updating the treatment strategy.MethodsThe partial pressures of O2and CO2in the thoracic cavity from 49 pneumothorax patients was analyzed before the management and after chest tube clogging during the management. The pneumothorax type was differentially diagnosed according to the partial pressure results, and the treatment strategy was updated accordingly.ResultsThe 49 pneumothorax patients were divided into four groups, as follows: Group A, 30 patients with a closed pneumothorax were confirmed to have a closed pneumothorax in the second analysis; Group B, 10 patients with an open pneumothorax were confirmed to have an open pneumothorax in the second analysis; Group C, three patients with a tension pneumothorax confirmed to have a tension pneumothorax in the second analysis; and Group D, six patients with a closed pneumothorax were re-diagnosed to have an open pneumothorax in the second analysis. The cure rates of the four groups after treatment were as follows: Group A (97%, 29/30), Group B (100%, 16/16), Group C (100%, 3/3) and Group D (100%, 6/6).ConclusionsAnalyzing thoracic cavity gas during pneumothorax treatment is suggested as an efficient way to monitor the pneumothorax conditions in real time and to provide instructions for updating the treatment strategy.

Effect of bromocriptine and metergoline in the treatment of hyperprolactinaemic states

1982 ◽  
Vol 100 (1) ◽  
pp. 10-17 ◽  
Author(s):  
Bruno Ambrosi ◽  
Pietro Travaglini ◽  
Paola Moriondo ◽  
Marina Nissim ◽  
Claudio Nava ◽  
...  
Keyword(s):  
Ct Scan ◽  
Gonadal Function ◽  
Similar Extent ◽  
Antitumoral Effect ◽  
Length Of Treatment ◽  
Group A ◽  
Group B ◽  
Group D ◽  
Precise Role

Abstract. The effects of bromocriptine or metergoline treatment were evaluated in 80 hyperprolactinaemic patients (62 women and 18 men). The patients were subdivided into 4 groups: group A) 16 women with idiopathic hyperprolactinaemia; group B) 19 women with untreated Prl-secreting microadenomas; group C) 27 women with unsuccessfully operated prolactinomas; group D) 18 men with unsuccessfully treated macroprolactinomas. Sixty-eight patients were given bromocriptine (2.5–20 mg/day) for 3–58 months and 33 patients were given metergoline (4–16 mg/day) for 3–19 months. Bromocriptine and metergoline were equally effective in the treatment of functional hyperprolactinaemia and of untreated microadenomas, while bromocriptine showed a more potent Prl-lowering effect than metergoline in patients with higher Prl levels and large prolactinomas; both drugs restored the gonadal function to a similar extent, though metergoline was effective in some cases, even in the absence of full Prl suppression. Bromocriptine seems to exert an antitumoral effect, as documented by CT scan in some patients with macroadenomas, but the precise role of both drugs with respect to dose, length of treatment and effectiveness after withdrawal needs to be evaluated further.

Abstract 977: Mesenchymal Stem Cell Therapy Prevents Ischemia/Reperfusion Injury and Promotes Tissue Regeneration

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Eddie Manning ◽  
Shashikumar Salgar ◽  
Mireya Hernandez ◽  
Dania Mateu ◽  
Roberto Vazquez-Padron ◽  
...  
Keyword(s):  
Mhc Class Ii ◽  
Tissue Regeneration ◽  
Ex Vivo ◽  
Ischemia Reperfusion ◽  
Pulmonary Veins ◽  
Left Lung ◽  
Blood Oxygenation ◽  
Group A ◽  
Group B ◽  
Group D

Ischemic heart disease, especially myocardial infarction, is an important cause of heart failure. However, therapeutic potential of mesenchymal stem cells (MSC) for myocardial or pulmonary ischemia reperfusion (IR) injury is not well studied. Interleukin-10 (IL-10) is an anti-inflammatory cytokine. In this study MSC and IL-10 engineered MSC were tested for their ability to prevent IR injury and promote tissue repair. Methods: Bone marrow cells from Lewis rat were cultured in plastic tissue culture flasks for 72 hours; cells in suspension were discarded and the adherent cells (MSC) were expanded. MSC were transduced with r vIL-10-retrovirus and selected on neomycin (1mg/ml for 7 days). Experimental design: following 120 minutes of left lung ischemia, Group A, rats received vIL10 transduced MSC (∼15 x 10 6 ; i.v.); Group B, rats received empty vector engineered MSC; Group C, received MSC; and Group D, received saline. Group E received no ischemia or MSC. Left lung ischemia was performed by clamping left pulmonary artery/vein/bronchus at end inspiration. At 24h, 72 h, & 7 days following ischemia, blood was collected from left and right pulmonary veins, separately. Results : Mean blood oxygenation (PaO2/FIO2 ratio, mmHg) at day 7 was significantly (P<0.05) reduced following IR injury in Group B (161± 77) and Group D (181± 64), compared to MSC-vIL10 (404± 32; Group A) & MSC (294±103;Group C) treated animals. In Group E, PaO2/FIO2 was 440± 42mm Hg. Significant improvement in lung oxygenation with MSC and vIL-10 therapy was observed as early as 3 days. MSC produced vIL-10 (∼5ng/ml) ex vivo . HP of lungs demonstrated reduced PMN cells with MSC therapy. Inflammatory mediators IL-1a, MCP-1, MIP-1a, and IL1-b protein levels were markedly increased in the injured lung; their analysis in MSC treated groups are underway. I.V. injected Tg GFP+MSC trafficked to the lung & other tissues. VEGF & HGF mRNA in MSC was 66% & 43% of β-actin, respectively. Ex vivo expanded MSC were CD34-, CD45+ (5%), CD29+ (92%), CD80-, CD86+ (10%), CD90+ (∼90%), MHC Class I low & MHC Class II-. Conclusions: Autologous MSC therapy prevented IR injury and served as an excellent vehicle to deliver cytokine. MSC therapy to prevent IR injury and enhance tissue regeneration in cardiopulmonary diseases seems promising.

scholarly journals The potential role of mobile phones in the spread of bacterial infections

2009 ◽  
Vol 3 (08) ◽  
pp. 628-632 ◽  
Author(s):  
Kabir O. Akinyemi ◽  
Audu D. Atapu ◽  
Olabisi O. Adetona ◽  
Akitoye O. Coker
Keyword(s):  
Mobile Phones ◽  
Potential Role ◽  
Statistical Significance ◽  
Coagulase Negative Staphylococcus ◽  
Strict Adherence ◽  
Bacterial Agent ◽  
Group A ◽  
Group B ◽  
Group D

BACKGROUND: Mobile phones are indispensable accessories both professionally and socially but they are frequently used in environments of high bacteria presence. This study determined the potential role of mobile phones in the dissemination of diseases. METHODOLOGY: Specifically, 400 swab samples from mobile phones were collected and divided into groups categorized by the owners of the phones as follows: Group A was comprised of 100 food vendors; Group B, 104 lecturers/students; Group C, 106 public servants; and Group D, 90 health workers. Samples were cultured and the resulting isolates were identified and subjected to antimicrobial susceptibility tests by standard procedures. RESULTS: The results revealed a high percentage (62.0%) of bacterial contamination. Mobile phones in Group A had the highest rate of contamination (92; 37%), followed by Group B (76; 30.6%), Group C (42; 16.9%), and Group D (38; 15.3%). Coagulase negative Staphylococcus (CNS) was the most prevalent bacterial agent from mobile phones in Group A (50.1%) and least from phones in Group D (26.3), followed by S. aureus. Other bacterial agents identified were Enterococcus feacalis, Pseudomonas aeruginosa, Escherichia coli, and Klebsiella spp. There was no statistical significance difference (P < 0.05) in the occurrence of S. aureus, the most frequently identified pathogenic bacterial agent isolated from the mobile phones in the study groups. Fluoroquinolones and third-generation cephalosporin were found to be effective against most isolates. CONCLUSION: Mobile phones may serve as vehicles of transmission of both hospital and community-acquired bacterial diseases. Strict adherence to infection control, such as hand washing, is advocated.

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