scholarly journals Effect of Aging on Dentinal Crack Formation after Treatment and Retreatment Procedures: a Micro-CT Study

2018 ◽  
Vol 29 (6) ◽  
pp. 530-535 ◽  
Author(s):  
Lilian Rachel de Lima Aboud ◽  
Bernardo Camargo dos Santos ◽  
Ricardo Tadeu Lopes ◽  
Leonardo Aboud Costa Viana ◽  
Miriam Fátima Zaccaro Scelza
Keyword(s):  
Patient Group ◽  
Crack Formation ◽  
Statistical Significance ◽  
Micro Ct ◽  
Root Volume ◽  
Young Root ◽  
Before And After ◽  
Root Dentin ◽  
Three Stages ◽  
Endodontic Retreatment

Abstract In order to evaluate the volume of dentinal cracks taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted lower incisive teeth presenting similar root volume, were divided into two groups according to the age of the patient: Group Young (18 - 30 years old) and Group Old (60 years old or more). Each specimen was scanned by microcomputed tomography (micro-CT) in three stages: (i) before any treatment, (ii) after endodontic treatment with Reciproc files (REC), and (iii) after subsequent endodontic retreatment. Each group was subdivided into two subgroups, according to the retreatment technique used: retreatment with REC or with ProTaper Universal Retreatment (PUR) files. For each subgroup, the images were analyzed for differences in the volume of dentinal cracks in the middle and apical thirds of the teeth , according to the dentin age. In both stages (before and after instrumentation), the micro-CT images of the old root dentin presented with higher volume of cracks than those of the young root dentin, statistical significance notwithstanding (p>0.01). The use of REC files appeared to have no statistically significant differences in the generation of cracks in any type of root dentin when compared with PUR files (p>0.01). When retreated with PUR, the old root dentin presented with a significantly higher volume of cracks (p<0.01) when compared with the old root dentin initially.

scholarly journals Experimental research of retreatability of root canals filled with bioceramic sealer

2021 ◽  
Vol 18 (4) ◽  
pp. 4-9
Author(s):  
A. V. Mitronin ◽  
D. A. Ostanina ◽  
Yu. A. Mitronin
Keyword(s):  
Experimental Research ◽  
Material Removal ◽  
Filling Material ◽  
Micro Ct ◽  
Root Canals ◽  
Working Length ◽  
Root Canal Retreatment ◽  
Single Cone ◽  
Before And After ◽  
Root Dentin

Aim. This study aimed to determine the residual filling material and the reestablishment of working length and apical patency after retreatment of TotalFill® BC Sealer.Materials and methods. Thirty maxillary incisors were used in a single cone obturation technique with TotalFill BC Sealer (FKG, Switzerland) and randomly divided into 6 groups according to the retreatment technique. The samples were scanned by micro-CT before and after retreatment in order to evaluate the residual filling material on the root dentin walls. Data were analyzed statistically with the Kruskal-Wallis tests (p < 0.05).Results. No instrumental protocol was able to remove all obturation material from the root canals. The differences in reduction in the total volume of filling material percentage were statistically significant (p < 0.05) among groups with and without ultrasound or sound activation in retreatment protocol.Conclusions. The most effective root canal retreatment was determined with D-Race + XP-endo Shaper + XP-Endo Finisher R + US (3.0 W) protocol; it was found that the efficiency of filling material removal was more than 92%.

STUDY CLINICAL FEATURE AND RESULT OF TREATMENT PHACOMORPHIC GLAUCOMA

2015 ◽  
pp. 71-75
Author(s):  
Van Nam Phan ◽  
Ba Ken Tran
Keyword(s):  
Visual Acuity ◽  
Intraocular Pressure ◽  
Statistical Significance ◽  
Corneal Edema ◽  
Clinical Feature ◽  
Anterior Chamber Angle ◽  
Male Population ◽  
Significant Difference ◽  
Operative Complications ◽  
Before And After

Purpose: Study clinical feature of phacomorphic glaucoma. To evaluate the result of treatment phacomorphic glaucoma. Method: The retrospective, interventional study on 36 cases with phacomorphic glaucoma who underwent treated at Hue Central Hospital from 6/2010 to 6/2011. Standard of research: visual, IOP, before and after surgery, accompanying lesions and post-operative complications. The surgery is considered successful when postoperative IOP less than 21 mmHg. Results: Age 50-59 presented 30.5 percent, ≥ 60 presented 91.7 percent. There was a slight female preponderance (66.7%) compared to the male population (33.3%) which implies a statistically marginally significant difference. However there was no statistical significance difference when compared by the two subgroups. Patient in country presented 61,1% and city presented 38,9%. The duration between the onset of pain and surgery from 0 to < 5 days (77.8%), from 6 to 10 (16.7%) and >10 days presented 5.5%. The preoperative intraocular pressure 35 to 45mmHg (47.2%), 46-55 (30.6%), 56-65 (13.9%) and more than 65 presented 8.3%. The visual acuity preoperation less than 1metre count finger (94.5%), less than 3 metre count finger presented 5.5%. Close anterior chamber angle presented 80.6% and shallow was presented 19.4%. Corneal edema presented 100%, iritis presented 94.4%, dilated pupil larger 5mm presented 83.3%, Synchynea iris and cataract presented 72.2%. ECCE, implantation IOL combined trabeculectomy presented 11.1%, Phaco, implantation IOL combined trabeculectomy presented 69,5%, ECCE implantation IOL presented 5.6%, Phaco, implantation IOL presented 13.8%. Postoperative visual acuity from 1/10 to 5/10 presented 72.2%, no case have VA larger than 5/10. Postoperative 3 months VA 1/10 to 5/10 presented 72.2%, larger VA 5/10 presented 8.3%. Postoperative 3 months intraocular pressure ≤ 21mmHg presented 91.7%, 22 to 24mmHg presented 8.3%, no case have IOP ≥25mmHg. Postoperative edema presented 58.3%, iritis presented 58.3%. Key words: phacomorphic Glaucoma

scholarly journals Treatment of HIV-associated facial lipoatrophy: impact on infection progression assessed by viral load and CD4 count

2013 ◽  
Vol 88 (4) ◽  
pp. 570-577 ◽  
Author(s):  
Flávia Machado Gonçalves Soares ◽  
Izelda Maria Carvalho Costa
Keyword(s):  
Viral Load ◽  
Disease Progression ◽  
Statistical Significance ◽  
Undetectable Viral Load ◽  
Fat Distribution ◽  
Cd4 Count ◽  
Before And After ◽  
Facial Lipoatrophy ◽  
A Prospective Study ◽  
The Impact

BACKGROUND: HIV/AIDS-Associated Lipodystrophy Syndrome includes changes in body fat distribution, with or without metabolic changes. The loss of fat from the face, called facial lipoatrophy, is one of the most stigmatizing signs of the syndrome.OBJECTIVES:To evaluate the effect of FL treatment using polymethylmethacrylate (PMMA) implants on disease progression, assessed by viral load and CD4 cell count.METHODS: This was a prospective study of 44 patients treated from July 2009 to December 2010. Male and female patients, aged over 18 years, with clinically detectable FL and who had never been treated were included in the study. PMMA implantation was done to fill atrophic areas. Laboratory tests were conducted to measure viral load and CD4 count before and after treatment.RESULTS: Of the 44 patients, 72.72% were male and 27.27% female, mean age of 44.38 years. Before treatment, 82% of patients had undetectable viral load, which increased to 88.6% after treatment, but without statistical significance (p = 0.67). CD4 count before treatment ranged from 209 to 1293, averaging 493.97. After treatment, the average increased to 548.61. The increase in CD4 count after treatment was statistically significant with p = 0.02.CONCLUSION: The treatment of FL with PMMA implants showed a statistically significant increase in CD4 count after treatment, revealing the impact of FL treatment on disease progression. Viral load before and after treatment did not vary significantly.

The effect of mask use on maternal oxygen saturation in term pregnancies during the COVID-19 process

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Erzat Toprak ◽  
Ayça Nazlı Bulut
Keyword(s):  
Oxygen Saturation ◽  
Pregnant Women ◽  
Stress Test ◽  
Statistical Significance ◽  
Categorical Variables ◽  
Fisher Exact Test ◽  
Coin Toss ◽  
Arterial Blood ◽  
Surgical Masks ◽  
Before And After

AbstractObjectivesOur aim was to evaluate the effect of standard surgical and N-95 respiratory mask use on maternal oxygen saturation, vital signs and result on non-stress tests in term pregnancies.MethodsIt is a prospective observational study. The study included healthy, not in labor, singleton pregnant women of 370/7–410/7 weeks who were applied to our hospital for routine obstetric control examination between March 1, 2020, and August 31, 2020. Patients were randomised by coin toss method. Oxygen saturation, systolic, and diastolic arterial blood pressure, pulse, respiratory rate, and temperature of pregnant women using surgical masks and respiratory masks were measured before and after the non-stress test. The tolerance of the masks was also evaluated. Student’s t-test was used for variables showing parametric distribution and the Mann Whitney U-test was used for non-parametric tests. The categorical variables between the groups was analyzed by using the Chi square test or Fisher Exact test. The statistical significance level was taken as p<0.05 in all tests.ResultsA total of 297 pregnant women using masks were included in the study. The effect of mask type on oxygen saturation before and after the non-stress test was found to be significant (97.1±1.8 corresponds to 95.3±2.6 for the surgical mask, p=0.0001; 97.8±1.7 corresponds to 93.7±2.0 for the respiratory mask, p=0.0001). Mask tolerance of patients using respiratory masks was significantly higher than those using surgical masks (mean 8, 1–10, p=0.0001).ConclusionsSurgical mask and respiratory mask usage decreased significantly in oxygen saturation in term pregnancies.

scholarly journals Gamma entrainment frequency affects mood, memory and cognition: an exploratory pilot study

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Ryan L. S. Sharpe ◽  
Mufti Mahmud ◽  
M. Shamim Kaiser ◽  
Jianhui Chen
Keyword(s):  
Pilot Study ◽  
Correlation Analysis ◽  
Negative Correlation ◽  
Cognitive Abilities ◽  
Statistical Significance ◽  
Assessment Scores ◽  
Frequency Group ◽  
Before And After ◽  
Mood Score ◽  
40 Hz

AbstractHere we provide evidence with an exploratory pilot study that through the use of a Gamma 40 Hz entrainment frequency, mood, memory and cognition can be improved with respect to a 9-participant cohort. Participants constituted towards three binaural entrainment frequency groups: the 40 Hz, 25 Hz and 100 Hz. Participants attended a total of eight entrainment frequency sessions twice over the duration of a 4-week period. Additionally, participants were assessed based on their cognitive abilities, mood as well as memory, where the cognitive and memory assessments occurred before and after a 5-min binaural beat stimulation. The mood assessment scores were collected from sessions 1, 4 and 8, respectively. With respect to the Gamma 40 Hz entrainment frequency population, we observed a mean improvement in cognitive scores, elevating from 75% average to 85% average upon conclusion of the experimentation at weak statistical significance ($$\alpha$$ α = 0.10, p = 0.076). Similarly, memory score improvements at a greater significance ($$\alpha$$ α = 0.05, p = 0.0027) were noted, elevating from an average of 87% to 95%. In pertinence to the mood scores, a negative correlation across all populations were noted, inferring an overall increase in mood due to lower scores correlating with elevated mood. Finally, correlation analysis revealed a stronger R$$^2$$ 2 value (0.9838) within the 40 Hz group between sessions as well as mood score when compared across the entire frequency group cohort.

scholarly journals Effects of pre-extraction intermittent PTH administration on extraction socket healing in bisphosphonate administered ovariectomized rats

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jae-Young Kim ◽  
Hyo-Won Jang ◽  
Jung-In Kim ◽  
In-Ho Cha
Keyword(s):  
Tooth Extraction ◽  
Bisphosphonate Therapy ◽  
Ovariectomized Rats ◽  
Control Group ◽  
Micro Ct ◽  
Micro Computed Tomography ◽  
Extraction Socket ◽  
Before And After ◽  
Socket Healing ◽  
Positive Effect

AbstractThe purpose of this study was to investigate the effect of administering intermittent parathyroid hormone (iPTH) before tooth extraction versus after tooth extraction on the risk of developing MRONJ in experimental animal model. Twenty-five ovariectomized rats received 6 weeks of bisphosphonate therapy. They were classified into 3 groups, based on the timing of the medication, as Control, Pre-PTH and Post-PTH groups. For Control group, normal saline was administered before and after tooth extraction. iPTH was administered during 4 weeks before tooth extraction for Pre-PTH group and after tooth extraction for Post-PTH group. The animals were euthanized 8 weeks after tooth extraction. Macroscopic, histological, micro-computed tomography (micro-CT), and histomorphometric examinations were conducted. The incidences of impaired healing were 11.11% both in Pre-PTH and Post-PTH groups, which was lower than the Control group (42.86%). Bone healing in the extraction socket, based on micro-CT and histomorphometry evaluations, was best in Post-PTH and worst in Control group. The Pre-PTH group showed moderate healing pattern. Despite of limitations in this study, the authors identified Pre-PTH group seems to have positive effect on extraction socket healing. With regard to timing, administering iPTH after tooth extraction was superior to applying it before tooth extraction.

scholarly journals Bone Cement Solidifiliation Influence the Limb Alignment and Gap Balance during TKA

2015 ◽  
Vol 2015 ◽  
pp. 1-3 ◽  
Author(s):  
Dongquan Shi ◽  
Xingquan Xu ◽  
Anyun Guo ◽  
Jin Dai ◽  
Zhihong Xu ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Bone Cement ◽  
Knee Arthroplasty ◽  
Mechanical Axis ◽  
Statistical Significance ◽  
Mechanical Alignment ◽  
Early Loosening ◽  
Flexion Extension ◽  
Before And After ◽  
Total Knee

Introduction. Mechanical alignment deviation after total knee arthroplasty is a major reason for early loosening of the prosthesis. Achieving optimum cement penetration during fixation of the femoral and tibial component is an essential step in performing a successful total knee arthroplasty. Bone cement is used to solidify the bone and prosthesis. Thickness imbalance of bone cement leads to the deviation of mechanical alignment. To estimate the influence of bone cement, a retrospective study was conducted.Materials and Methods. A total of 36 subjects were studied. All the TKA were performed following the standard surgical protocol for navigated surgery by medial approach with general anaesthesia. Prostheses were fixed by bone cement.Results. We compared the mechanical axis, flexion/extension, and gap balance before and after cementation. All the factors were different compared with those before and after cementation. Internal rotation was reached with statistical significance (P=0.03).Conclusion. Bone cement can influence the mechanical axis, flexion/extension, and gap balance. It also can prompt us to make a change when poor knee kinematics were detected before cementation.

Does Xbox 360 Kinect training improve postural balance in young healthy adults? A preliminary study. (Preprint)

2021 ◽  
Author(s):  
Marta Grabowicz ◽  
Anna Daniluk ◽  
Anna Hadamus ◽  
Dariusz Białoszewski
Keyword(s):  
Postural Balance ◽  
Statistical Significance ◽  
Balance Training ◽  
The Body ◽  
Control Group ◽  
Healthy Individuals ◽  
Unstable Surface ◽  
Baseline Group ◽  
Before And After ◽  
P Balance

BACKGROUND Balance training in young adults may increase coordination, cognitive function or the symmetry of strength on both sides of the body. It is an essential tool for injury or fall prevention and a precondition for becoming a professional athlete. OBJECTIVE The aim of this study was to assess the effect of Xbox 360 Kinect training on postural balance in young, healthy individuals. METHODS The study enrolled 75 individuals who were randomly assigned to three equal groups. The first group (Group VR) performed exercises on an Xbox 360 Kinect console, and the second group (Group T) performed conventional all-round exercises. The third group was a control group (Group C). Each group underwent balance assessments on the Biodex Balance posturographic platform, including the Balance Error Scoring System test, before and after the training cycle. The level of statistical significance was set at P<.05. RESULTS Group VR and Group T achieved statistically significant improvements in the sway index compared with baseline. Group T gained significant decrease in the sway index on the unstable surface (P=.002). Group VR and group T demonstrated significant decreases in the mean sway index on stable and unstable surfaces (group VR — P=.035; group T — P=.001) Group C did not achieve a statistically significant improvement in the sway index. None of the groups demonstrated a statistically significant decrease in the test error count. CONCLUSIONS Virtual reality in the form of video games played on an Xbox 360 Kinect console may be an effective method of balance training in healthy individuals.

State Recreational Marijuana Laws and Dispensaries: Chronic School Absenteeism in Washington State

2021 ◽  
Vol 8 (4) ◽  
Author(s):  
Maxim Gakh ◽  
Courtney Coughenour ◽  
Brooke Kleven ◽  
Brian Labus
Keyword(s):  
Social Factors ◽  
Statistical Significance ◽  
Secondary Analysis ◽  
Risk Groups ◽  
Washington State ◽  
School Absenteeism ◽  
Chronic Absenteeism ◽  
Significant Difference ◽  
Before And After ◽  
Recreational Marijuana

Objective: Whereas states continue to experiment with liberalized marijuana laws, how these laws impact health, education, and social factors is not yet fully understood. In this study, we examined whether chronic school absenteeism rates changed in Washington State in the presence of recreational marijuana dispensaries pursuant to implementation of the state’s recreational marijuana laws. Methods: We conducted a secondary analysis using school district chronic absenteeism rates before and after the presence of recreational dispensaries. Results: The results of the independent samples t-test showed no statistically significant difference in chronic absenteeism rates among districts with or without recreational marijuana dispensaries. Conclusions: The finding of no statistical significance for chronic absenteeism in districts with and without recreational dispensaries – a pattern that largely persisted among at-risk groups – supports that the presence of recreational marijuana dispensaries seems neither to exacerbate nor improve chronic school absenteeism rates. This finding is important for policymakers, practitioners, and researchers trying to understand the changing marijuana legal landscape.

Using the Talk Test to Prescribe and Guide Exercise Intensity: Speaking Your Way to Improved Fitness

2018 ◽  
Author(s):  
Nick Preobrazenski
Keyword(s):  
Exercise Intensity ◽  
Ventilatory Threshold ◽  
Peak Oxygen Consumption ◽  
Individual Level ◽  
Non Invasive ◽  
Before And After ◽  
Small Incidence ◽  
Three Stages ◽  
Physiological Markers ◽  
Healthy Males

Introduction: The Talk Test (TT) is a non-invasive, subjective method of prescribing exercise intensity. The TT involves three stages. When exercisers can speak comfortably, can speak but not comfortably, or cannot speak comfortably, they are in the positive (POS), equivocal (EQ), and negative (NEG) TT stages, respectively. The NEG stage correlates with important physiological markers such as ventilatory threshold and lactate threshold. Given the evidence demonstrating large increases peak oxygen consumption (VO2peak) when training at intensities above these markers, the purpose of the study was to test the hypothesis that the TT is efficacious for improving VO2peak at both the group and individual level in young, healthy males. Methods: 11 healthy males completed a maximal fitness test before and after 4 weeks of training 4 times per week for 30 minutes in the NEG stage. The TT was performed every 2.5 to 5 minutes to ensure that the resistance would be enough to elicit a NEG response. Changes in VO2peak below 2 times a previously established typical error were classified as non-response. Results: Four weeks of training at NEG induced a significant increase (11.5%) in VO2peak (PRE: 45.80 mL/Kg/min ± 4.92; POST 51.07 mL/Kg/min ± 5.45, p < 0.001). Furthermore, only one participant (9.09%) was classified as a non-responder in VO2peak following training. Conclusion: These results suggest that the TT can efficaciously prescribe and guide exercise intensity in young, healthy males, and that training at an intensity that prevents comfortable speech leads to a small incidence of non-response

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