scholarly journals The difference nanocomposite hardness level using LED photoactivation based on curing period variations

2011 ◽  
Vol 23 (1) ◽  
Author(s):  
Hasiana Tatian ◽  
Moch. Richata Fadil ◽  
Milly Armilia
Keyword(s):  
Physical And Mechanical Properties ◽  
Degree Of Polymerization ◽  
Curing Time ◽  
Group Iii ◽  
Hardness Level ◽  
Hardness Tester ◽  
Group I ◽  
Light Curing ◽  
The Difference

Polimerizatian is the critical stage to determine the quality of composites resin, this involves isolated monomer carbon double bonds being converted to an extended network of single bonds. Physical and mechanical properties of composites are influenced by the level of conversion attained during polymerization. An adequate light intensity and light curing time are important to obtain the degree of polymerization. The objective of this study is to evaluate the difference of the hardness nanocomposites which activated by LED LCU based on the variation of curing times. This study is a true experimental research. The samples were made from nanocomposites material with cylinder form of 4 mm in depth, 6 mm in diameter. This samples divided into 3 groups of curing times. Group, I was cured for 20's curing time as a control due to manufactory recommended; Group II was cured for 30's, and Group III was cured for 40's and the hardness (Rebound hardness tester) was determined using Rebound scale (RS) and converted by Mohs scale (MS). There was a very significant level of hardness rate from each group using ANOVA test. The result of the study concludes that there were the differences on the nanocomposites hardness level cured under different curing times 20, 30 and 40 sec. The longer of curing times, the higher level of hardness.

scholarly journals Analysis of the Effect of Dental Chair Light on the Knoop Hardness of Composite Resin While Light Curing with QTH and LED Light Units

2012 ◽  
Vol 3 (2) ◽  
pp. 156-160
Author(s):  
Bandish Parekh ◽  
Sucheta Sathe
Keyword(s):  
Composite Resin ◽  
Light Emitting Diode ◽  
Hardness Test ◽  
Knoop Hardness ◽  
Degree Of Polymerization ◽  
Led Light ◽  
Group Iii ◽  
Dental Chair ◽  
Group I ◽  
Light Curing

ABSTRACT Dental chair lights have been known to rapidly polymerize lightcured composites beyond the point of workability. Often in our dental clinics we are advised to switch off the dental chair light while light curing of dental composites. The purpose of this study was to determine whether the dental chair light causes any effect on the degree of polymerization of light cured composites using the quartz tungsten halogen (QTH) and the light emitting diode (LED) light curing units (LCUs). Filtek Z350 composite samples of 2 × 5 mm were prepared in an acrylic mold. Four groups were made having 20 samples each. In group I and II light curing was done using QTH LCU with and without the dental chair light respectively. Similarly in group III and IV LED LCU was used. Microhardness was measured and compared using Knoop's hardness Test. Data was submitted to ANOVA and Tukey's test. Results showed that the average microhardness was significantly higher in group 4 (LED light curing with dental chair light on). Thus, it was concluded that the dental chair light can be left on while using QTH and LED LCU's during light curing of composite material. How to cite this article Parekh B, Sathe S, Hegde V. Analysis of the Effect of Dental Chair Light on the Knoop Hardness of Composite Resin While Light Curing with QTH and LED Light Units. World J Dent 2012;3(2):156-160.

Inhibition of cardiac vagal component of baroreflex by group III and IV afferents

1991 ◽  
Vol 260 (3) ◽  
pp. H730-H734 ◽  
Author(s):  
P. N. McWilliam ◽  
T. Yang
Keyword(s):  
Peroneal Nerve ◽  
Baroreceptor Reflex ◽  
Interval Prolongation ◽  
Group Iii ◽  
Control Value ◽  
Pressure Elevation ◽  
Group I ◽  
Afferent Fibers ◽  
The Difference ◽  
The Right

The action of electrically evoked activity in somatic afferent fibers on the sensitivity of the baroreceptor reflex was examined in decerebrate cats. The sensitivity of the reflex was expressed as the difference between the maximum prolongation of R-R interval in response to carotid sinus pressure elevation and the mean of 10 R-R intervals immediately before pressure elevation. The control value of R-R interval prolongation was 192 +/- 50 ms. Stimulation (10 Hz) of group I and II fibers of the right peroneal nerve (evoked volleys recorded from the sciatic nerve) had no effect on R-R interval prolongation (171 +/- 45 ms). Recruitment of group III fibers (10 Hz) conducting at 23.6 +/- 0.65 m/s reduced the prolongation of R-R interval to 52 +/- 14 ms. Recruitment of group IV fibers (10 Hz) conducting less than 2.5 m/s further reduced the prolongation of R-R interval to 1.0 +/- 8.0 ms. It is concluded that the inhibition of the cardiac vagal component of the baroreceptor reflex produced by electrical stimulation of the peroneal nerve is mediated by afferent fibers of groups III and IV.

Seasonal variations in wool growth and heat tolerance of sheep. I. Wool growth

1960 ◽  
Vol 11 (1) ◽  
pp. 75 ◽  
Author(s):  
M Wodzicka
Keyword(s):  
Body Weight ◽  
Day Treatment ◽  
The Other ◽  
Seasonal Rhythm ◽  
Group Iii ◽  
Wool Growth ◽  
Group I ◽  
The Mean ◽  
Group Ii ◽  
The Difference

The monthly wool growth of three groups of rams was studied at Beltsville, Maryland. Group I received natural daylight (at 38° 53' N.) and was shorn monthly. Group II had a 7:17 hours of daylight to hours of darkness rhythm and was shorn every 6 months, once in winter and once in summer. Group III received natural daylight and was likewise shorn every 6 months. The rams of all groups produced more wool in summer than in winter. This difference was significant (P<0.001). The mean body weight and food intake were both greater in the winter months, which indicated that the seasonal rhythm of wool growth was not a consequence of poorer feeding in winter. The rams which were shorn monthly (group I) grew considerably more wool than the other two groups, but the difference was not statistically significant. The short-day treatment of group II did not increase the annual wool production nor decrease the seasonal rhythm of wool growth. The balance of evidence from this and other experiments indicates that temperature rather than light controls the seasonal rhythm of wool growth.

Mortality rates and risk factors for asymptomatic deep vein thrombosis in medical patients

2005 ◽  
Vol 93 (01) ◽  
pp. 76-79 ◽  
Author(s):  
Alain Leizorovicz ◽  
Alexander Cohen ◽  
Alexander Turpie ◽  
Carl-Gustav Olsson ◽  
Samuel Goldhaber ◽  
...  
Keyword(s):  
Risk Factors ◽  
Deep Vein Thrombosis ◽  
Mortality Rates ◽  
Hazard Ratio ◽  
Group Iii ◽  
Vein Thrombosis ◽  
Group I ◽  
Compression Ultrasound ◽  
The Difference ◽  
Deep Vein

SummaryThe clinical importance of asymptomatic proximal and distal deep vein thrombosis (DVT) remains uncertain and controversial. The aim of this retrospective,post-hoc analysis was to examine mortality and risk factors for development of proximal DVT in hospitalized patients with acute medical illness who were recruited into a randomized, prospective clinical trial of thromboprophylaxis with dalteparin (PREVENT).We analyzed 1738 patients who had not sustained a symptomatic venous thromboembolic event by Day 21 and who had a complete compression ultrasound of the proximal and distal leg veins on Day 21. We examined the 90-day mortality rates in patients with asymptomatic proximal DVT (Group I, N = 80), asymptomatic distal DVT (Group II, N = 118) or no DVT (Group III, N = 1540).The 90-day mortality rates were 13.75%, 3.39%, and 1.92% for Groups I–III, respectively. The difference in mortality between Group I and Group III was significant (hazard ratio 7.63, 95% CI = 3.8–15.3;p < 0.0001),whereas the difference between Groups II and III did not reach significance (hazard ratio 1.36, 95% CI = 0.41–4.45).The association of asymptomatic proximal DVT with increased mortality remained highly significant after adjusting for differences in baseline demographics and clinical variables. Risk factors significantly associated with the development of proximal DVT included advanced age (p = 0.0005), prior DVT (p = 0.001), and varicose veins (p = 0.04). In conclusion, the high mortality rate in patients with asymptomatic proximal DVT underscores its clinical relevance and supports targeting of asymptomatic proximal DVT as an appropriate endpoint in clinical trials of thromboprophylaxis.

scholarly journals The effect of different irrigation techniques on the quality of cleaning of root canal walls

2008 ◽  
Vol 55 (4) ◽  
pp. 221-228
Author(s):  
Violeta Pavlovic ◽  
Slavoljub Zivkovic
Keyword(s):  
Root Canal ◽  
Smear Layer ◽  
Sodium Hypochlorite Solution ◽  
Efficient Removal ◽  
Human Teeth ◽  
Root Canals ◽  
Group I ◽  
Different Types ◽  
The Difference

Aim: To evaluate the effect of irrigation techniques, i.e. different types of irrigation needles, on the quality of cleaning of root canal walls using scanning electron microscopy (SEM). Material and Method: The study was conducted on 16 extracted, single-rooted, human teeth. The samples were allocated to two experimental groups depending on the type of the irrigation needle. Conventional needles were used for the irrigation of Group I and laterally perforated ones for Group II. All root canals were instrumented using K files and the Step-back technique. During instrumentation, all samples were irrigated with 2.5 % sodium hypochlorite solution followed by final irrigation with 17 % EDTA for 1 min. After that, all samples were irrigated with 10 ml of distilled water. The roots were, then, sectioned longitudinally and middle one third of each root canal was analyzed using SEM. Quantitative analysis was based on criteria by H?lsmann et al. Results: The obtained results showed that the more efficient removal of debris and the smear layer was accomplished in the group of samples irrigated using laterally perforated needles than conventional needles. The difference between the investigated irrigation techniques were statistically significant (p<0.01). Conclusion: The use of laterally perforated needles for irrigation allows more efficient cleaning of root canal walls, i.e. the removal of debris and the smear layer.

scholarly journals Effectiveness of pharmacopuncture by “alloplant” biomaterial in complex therapy of knee joint osteoarthritis

2020 ◽  
Vol 19 (1) ◽  
pp. 45-49
Author(s):  
Ruslan K. Urazbakhtin ◽  
Raushaniya N. Kildebekova ◽  
Lira T. Gilmutdinova ◽  
Vadim T. Kaybyshev ◽  
Ravil Sh. Mirkhaydarov ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Drug Therapy ◽  
Knee Joint ◽  
Well Being ◽  
Biologically Active ◽  
Basic Drug ◽  
Group Iii ◽  
Group I ◽  
Immunological Mechanisms

Background. Osteoarthritis is characterized by a decrease in the quality of life, which is currently considered as the main measure of well-being of an individual and a criterion for the effectiveness of treatment and rehabilitation measures. Modern research emphasizes the need for an integrated approach to the treatment of osteoarthritis, which should include pharmacological and non-drug methods of treatment. Aim. The purpose of the study was to evaluate the effectiveness of pharmacopuncture administration of Alloplant biomaterial by patients with osteoarthritis of the knee joint from the standpoint of influencing the immunological mechanisms of the disease. Methods. The randomization methodology was divided into 3 groups, comparable in terms of clinical and functional characteristics. Group I patients (n = 39) have standard basic drug therapy according to the federal clinical guidelines Osteoarthritis approved by the Association of Rheumatologists of Russia (2013), with additions from 2016; in patients of group II (n = 39), in addition to drug therapy, dispersed Alloplant biomaterial was used according to the original method; group III patients (n = 39) against the background of basic drug therapy are additionally prescribed a combination of dispersed Alloplant biomaterial at biologically active points and magnetic therapy with a pulsed magnetic field. Results. Against the background of the treatment of patients with osteoarthritis using pharmacopuncture with Alloplant biomaterial and magnetotherapy, there was a positive dynamics in clinical data with a significant decrease in pain intensity when walking and at rest, stiffness, with the restoration of immune status parameters and an improvement in the quality of life in the field of physical and psychological health . A more pronounced and lasting positive dynamics was observed in patients of group III against the background of the combined effects of pharmacopuncture with Alloplant biomaterial and magnetotherapy. Conclusion. The Alloplant biomaterial has a positive effect in the treatment of patients with stage III osteoarthritis according to the KellgrenLawrens classification. The similarity of the mechanism of action with drugs with a structurally modifying effect on cartilage allows us to recommend pharmacopuncture with Alloplant biomaterial for widespread use in the treatment of osteoarthritis.

EFFECTS OF BIOLOGICAL THERAPY ON QUALITY OF LIFE AND PSYCHOEMOTIONAL STATUS OF PATIENTS WITH ULCERATIVE COLITIS

2021 ◽  
Vol 74 (10) ◽  
pp. 2610-2613
Author(s):  
Antonina V. Varvarynets
Keyword(s):  
Quality Of Life ◽  
Ulcerative Colitis ◽  
Biological Therapy ◽  
Old Patients ◽  
Group Iii ◽  
Group I ◽  
Sf 36 ◽  
Nonspecific Ulcerative Colitis ◽  
Social Introversion

The aim: To compare the effects of tofacitinib, adalimumab and budesonide on the quality of life and psychoemotional status of patients with moderate UC. Materials and methods: The study included 104 patients with moderately severe UC aged between 18 and 75 years old. Patients were divided into 3 groups. Group I consisted of patients with UC treated with budesonide 9 mg 1 g / d (BUD; n = 34). Group II – of patients receiving adalimumab at an initial dose of 160 mg and 80 mg at week 2, followed by maintenance dose of 40 mg weekly (ADA; n = 38) and group III, who received tofacitinib 10 mg 2p / d (TOF; n = 32). Evaluation of quality of life and psycho-emotional status of patients was performed using IBDQ, SF-36 and MMRI questionnaires. Results: According to the IBDQ-questionnaire, all groups after treatment had a statistically significant increase in their results: BUD (from 146,44 ± 2,23 to 151,36 ± 2,40), ADA (from 144,28 ± 3,10 to 172,36 ± 3,12), TOF (from 149,22 ± 2, 86 to 184.36 ± 2.88), respectively, p <0.05. Also, after treatment statistically significant changes were seen in patients of all groups in regards to the psychological and physical components of the SF-36 scale. Analysis of the personality profile using MMRI of all groups of patients showed a change in scales 2 (depression), 3 (hysteria), 5 (tenderness-femininity), 6 (paranoia) and 0 (social introversion), which significantly improved in the ADA and TOF groups. Conclusions: Tofacitinib and adalimumab in patients with nonspecific ulcerative colitis of moderate severity had a better effect on quality of life and psychoemotional status compared with budesonide treatment.

scholarly journals The Influence of Resin Infiltration Pretreatment on Orthodontic Bonding to Demineralized Human Enamel

2020 ◽  
Vol 10 (10) ◽  
pp. 3619
Author(s):  
Marina Simunovic Anicic ◽  
Cecilia Goracci ◽  
Jelena Juloski ◽  
Ivana Miletic ◽  
Senka Mestrovic
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Present Report ◽  
Group Iv ◽  
Group Iii ◽  
Low Viscosity ◽  
Initial Caries ◽  
Group I ◽  
Demineralized Enamel ◽  
The Difference

Prior research reveal that low-viscosity resin is able to significantly penetrate initial caries lesions, which leads to their stabilization. The objective of the present report is to assess the shear bond strength (SBS) of orthodontic brackets bonded with different adhesives to demineralized enamel treated with a low-viscosity resin infiltrant. It also aims to compare the achieved bond strengths to those achieved in relation to sound enamel (SE). A total of 48 newly extracted third molars were collected, distributed in four groups (n=12), covered with a nail varnish, with 4 x 4 mm of uncoated area, immersed in Buskes demineralizing solution (14 days, 37 °C) or remained untreated. Group I: SE + Transbond XT; Group II: demineralized enamel (DE) + ICON + Transbond XT; Group III: DE + ICON + Scotchbond Universal; Group IV: DE + ICON + Assure PLUS. SBS was quantified in megapascals (MPa) and statistically analyzed (ANOVA, p ≤ 0.05). The mode of failure was assessed microscopically (10 x magnification). The highest SBS detected was in Group IV, and the difference was statistically significant (F = 14.37; p = 0.000). Treatment with a resin infiltrant on DE does not impair the shear bond strength when compared to SE, although it does produce a significantly higher strength when combined with Assure PLUS.

Effects of Electroacupuncture on Intraoperative and Postoperative Analgesic Requirement

2002 ◽  
Vol 20 (2-3) ◽  
pp. 56-65 ◽  
Author(s):  
Chin-Keng Sim ◽  
Pei-Chang Xu ◽  
Hwee-Leng Pua ◽  
Guojing Zhang ◽  
Tat-Leang Lee
Keyword(s):  
Early Postoperative Period ◽  
Morphine Consumption ◽  
Control Group ◽  
Analgesic Requirement ◽  
Group Iii ◽  
Group I ◽  
Group Ii ◽  
The Difference ◽  
Sparing Effect ◽  
Postoperative Morphine

Acupuncture has been shown to be effective in experimental and clinical acute pain settings. This study aims to evaluate the effect of preoperative electroacupuncture (EA) on intraoperative and postoperative analgesic (alfentanil and morphine) requirement in patients scheduled for gynaecologic lower abdominal surgery. Ninety patients were randomly assigned to one of three groups: Group I (control group) –received placebo EA for 45 minutes before induction of general anaesthesia (GA); Group II –preoperative EA instituted 45 minutes before induction of GA; Group III – 45 minutes of postoperative EA. The Bispectral Index monitor was used intraoperatively to monitor the hypnotic effect of anaesthetic drugs, and alfentanil was titrated to maintain the blood pressure and pulse rate within ±15% of basal values. Postoperative pain was managed by intravenous morphine via a patient-controlled analgesia (PCA) device. Patients in Group II (0.44 ± 0.15μg/kg/min) received less alfentanil than those in Group III (0.58 ± 0.22μg/kg/min) (p=0.024), but not significantly less than those in Group I (0.51 ± 0.21μg/kg/min) (p=0.472). Postoperative morphine consumption was numerically lower in Group II compared with the other groups; however, the difference was statistically significant only during the period of 6–12 hours between Group II [0.03 (0.05) mg/kg] and Group I [0.10 (0.11) mg/kg] (p=0.015), and Group II and Group III [0.08 (0.10) mg/kg] (p=0.010). The 24-hour cumulative morphine consumption for Group II (0.52 ± 0.19mg/kg) was less than that for either Group I (0.68 ± 0.38mg/kg) or Group III (0.58 ± 0.27mg/kg), but the difference did not reach significance. In conclusion, preoperative EA leads to a reduced intraoperative alfentanil consumption, though this effect may not be specific, and has a morphine sparing effect during the early postoperative period.

Comparing the Sealing Ability of Contemporary Restorative Materials

2016 ◽  
Vol 8 (1) ◽  
pp. 12-15
Author(s):  
Repala R Navya ◽  
GB Shivamurthy
Keyword(s):  
Root Canal ◽  
Glass Ionomer Cement ◽  
Three Dimensional ◽  
Mineral Trioxide Aggregate ◽  
Group Iii ◽  
Sealing Ability ◽  
Group I ◽  
Restorative Materials ◽  
The Difference ◽  
Post Hoc

ABSTRACT Aim The success of the root canal treatment mainly depends upon the three-dimensional obturation of the root canal system. The purpose of this study is to compare the sealing ability of biodentine, mineral trioxide aggregate (MTA), and glass ionomer cement (GIC). Materials and methods Teeth were obturated with gutta-percha using AH PLUS sealer in all groups. The intracanal sealing material used in group I was GIC, group II was MTA, and group III was biodentine. The specimens were longitudinally sectioned. Coronal microleakage was determined under a stereomicroscope using 15× magnification. Data were statistically analyzed using one-way analysis of variance followed by post hoc multiple comparisons (Bonferroni). Results Biodentine group leaked significantly less than the GIC group (p < 0.05). The sealing ability of biodentine was better than that of MTA, but the difference was not statistically significant. Conclusion Biodentine or MTA may be preferred over GIC as an intracanal barrier. Clinical significance Biodentine or MTA can be used in areas where an impervious seal has to be obtained. They can also be used to seal the perforations in the coronal middle and apical thirds of the root canal. These materials have an ability to form a barrier during apexification procedures. How to cite this article Navya RR, Shivamurthy GB. Comparing the Sealing Ability of Contemporary Restorative Materials. CODS J Dent 2016;8(1):12-15.

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