Assessment of Capability of Lithium Disilicate Glass Ceramics to Reproduce the A2 Shade and to Mask A4 Substrates

2021 ◽  
Vol 9 (1) ◽  
pp. 5-9
Author(s):  
Samarla Aruna Kumari ◽  
Averneni Prema Latha Prema Latha ◽  
Naveen Reddy ◽  
Rohit Sharma ◽  
Mahesh Melkundi ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Group Iv ◽  
Group Vi ◽  
Group V ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Color Differences ◽  
Shade Guide

Aim: Capability of lithium disilicate glass ceramics to reproduce the A2 shade and to mask A4 substrates.Materials and Method: 32 lithium disilicate ceramic specimens were classified materials into 8 groupsof 4 each. Group I- III high translucency (HT) monolayer discs, group IV- VI had low translucency (LT)monolayer discs, group VII- VIII had medium translucency (MO) bilayer discs. A2 shade tab shade guide(VITA classical A1-D4) was used for CIE L*a*b* measurements of control. Color differences using thresholdswas as follows: for imperceptible (?E < 1.0), perceptible (1.0 < ?E < 3.3), and clinically unacceptable (?E> 3.3) differences.Results: ?E in group IV exhibited highest (9.92±0.21) and group III lowest (8.08± 0.25) value. When thecomplex was compared to the A4 substrate, significant difference among all groups (p < 0.05) was found.?E values when the complex was compared to the A2 shade tab, group III exhibited highest (4.82±0.16)and group V lowest (0.72±0.06) value. In groups I specimens had acceptable differences, group II hadperceptible differences, group III had perceptible differences, group IV had acceptable differences, group Vhad imperceptible differences, group VI and VII had acceptable differences and group VIII had imperceptibledifferences.Conclusion: Authors suggested to use LT ceramics with less thickness in the range of 0.5 mm- 0.7 mm tomask discoloration.

scholarly journals Shear Bond Strength of Orthodontic Brackets Cured with Different Light Sources under Thermocycling

2010 ◽  
Vol 04 (03) ◽  
pp. 257-262 ◽  
Author(s):  
Oral Sokucu ◽  
Seyda Herguner Siso ◽  
Firat Ozturk ◽  
Ruhi Nalcaci
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Group Iv ◽  
Light Sources ◽  
Group Vi ◽  
Group V ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Light Curing

Objectives: The aim of this study was to compare the shear bond strength (SBS) of two different light sources under different thermal cycle frequencies.Methods: Ninety human premolar teeth were divided into six groups, in which three groups consisted of halogen groups – Group I was cured with halogen without thermocycle, Group II cured with halogen with 500 thermocycles, and Group III cured with halogen with 10,000 thermocycles. The other three groups consisted of Plasma arc (PAC) group – Group IV was cured with PAC without thermocycle, Group V cured with PAC thermocycled 500 cycles, and Group VI cured with PAC thermocycled 10,000 cycles. Two way ANOVA was used to compare the SBS between the groups, and chi squaretest was used to compare the bond failure of ARI scores among the groups.Results: A significant difference was found for curing lights (P<.001) and thermocycling (P<.01). However, there was no interaction between light curing and thermocycling (P=.177). The halogen groups demonstrated higher mean SBS than the PAC groups. Both groups showed a significant reduction between no cycles and 10,000 cycles (P<.05).Conclusions: Both light sources showed favorable SBS performance without the thermocycle procedure. Thermocycling significantly decreased the SBS values of both groups. (Eur J Dent 2010;4:257- 262)

scholarly journals Effect of a Diet Composed of Genetically Modified Feed Components on the Selected Immune Parameters in Pigs, Cattle, and Poultry

2013 ◽  
Vol 57 (2) ◽  
pp. 209-217 ◽  
Author(s):  
Dariusz Bednarek ◽  
Katarzyna Dudek ◽  
Krzysztof Kwiatek ◽  
Małgorzata Świątkiewicz ◽  
Sylwester Świątkiewicz ◽  
...  
Keyword(s):  
Soybean Meal ◽  
Genetically Modified ◽  
Group Iv ◽  
Group Vi ◽  
Group V ◽  
Group Iii ◽  
Immune Parameters ◽  
Group I ◽  
Toxin Protein ◽  
Gm Soybean

Abstract The aim of the study was to evaluate the immune effects of genetically modified (GM), insect resistant corn (MON810) expressing toxin protein of Bacillus thuringiensis, and glyphosate-tolerant soybean meal (Roundup Ready MON-40-30-2), which are used as the feed mixture components in domestic animals. The study was conducted on 60 pigs (36 fatteners and 24 sows), 20 calves, 40 broilers, and 40 laying hens. Each species was divided into four basic nutritional groups: group I (control) - conventional feed, group II - feed consisted of GM soybean meal and non-modified corn, group III - non-modified soybean meal and GM corn, group IV - GM soybean meal and GM corn. Moreover, in the experiment on fatteners two additional groups were formed: group V - animals fed both conventional soybean meal and bruised grain, and group VI - GM soybean meal and conventional bruised grain. The results of study did not reveal any significant effect of feed mixtures containing GM components on the immune response in all animals regardless of their species and technological producing groups.

scholarly journals Comparative Evaluation of Apical Sealing Ability of Different Obturation Techniques by Confocal Microscopy: An In Vitro Study

2020 ◽  
Vol 8 (02) ◽  
pp. 55-59
Author(s):  
Reetu Arora ◽  
Yogesh Kumar ◽  
Neetu Jindal ◽  
Renu Aggarwal ◽  
Kavneet Takhar
Keyword(s):  
Root Canal ◽  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Group Iv ◽  
Control Group ◽  
Group Vi ◽  
Group V ◽  
Group Iii ◽  
Group I

Abstract Introduction The aim of obturation in the root canal is to completely seal the canal space to eliminate all the portals of entry and exit between root canal and periodontal space. Various techniques have been developed to achieve a hermetic seal. Materials and Methods As many as 150 extracted human maxillary central incisors were taken for the study. Biomechanical preparation was done up to F5 protaper file. According to different obturation techniques, samples were divided into six groups, keeping 30 samples in experimental and 15 samples in control groups. Group I–Lateral Condensation, Group II–Thermafil, Group III–Beefill, Group IV–GuttaFlow, Group V–Positive Control group, Group VI–Negative Control group. After obturation, the samples were immersed in 2% Rhodamine-B dye for 24 hours. Each sample was longitudinally sectioned to examine under confocal laser scanning microscope. Statistical Analysis The results were evaluated with ANOVA and posthoc Tukey honest significant difference (HSD) comparison test. Results The mean values of dye penetration of different groups were Group I (Lateral Condensation) 1.51 ± 0.451, Group II (Thermafil) 0.918 ± 0.399, Group III (Beefill) 1.30 ± 0.559. Group IV (GuttaFlow) 0.655 ± 0.396, Group V (Positive Control group) 1.96 ±0.046, Group VI (Negative Control group) 0 ± 0. The lowest mean value of apical microleakage was found in GuttaFlow amongst all experimental groups. Conclusion It can be concluded that the GuttaFlow obturating material exhibited better apical sealing ability with canal walls.

scholarly journals An in vitro comparative Evaluation of Fracture Strength of Roots Instrumentated with Self-adjusting File and Reciproc Reciprocating File, with and without Obturation

2017 ◽  
Vol 1 (1) ◽  
pp. 20-25
Author(s):  
Pooja Kabra
Keyword(s):  
Fracture Strength ◽  
Comparative Evaluation ◽  
Group Iv ◽  
Control Group ◽  
Group V ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Group Ii

ABSTRACT Aim The purpose of this study was to evaluate the fracture strength of roots instrumented with the self-adjusting file (SAF; ReDent-Nova, Ra'anana, Israel) and the Reciproc reciprocating file and that were and were not obturated using the warm vertical lateral compaction technique. Materials and methods In total, 75 mandibular premolar teeth were sectioned at or below the cementoenamel junction to obtain roots 13 mm in length. The roots were balanced with respect to buccolingual and mesiodistal diameters and weight. They were distributed into four experimental groups and one control group (n = 15): No instrumentation (group I), instrumentation with SAF files but no obturation (group II), instrumentation with SAF files and obturated with warm vertical lateral compaction (group III), instrumentation with Reciproc File but no obturation (group IV), and instrumentation with Reciproc File and obturated with warm vertical lateral compaction (group V). AH Plus sealer (Dentsply DeTrey, Konstanz, Germany) was used along with gutta-percha points. One week later, a vertical load was applied to the specimen's canal until fracture occurred. Data were statistically analyzed using one-way analysis of variance (p = 0.05). Results The mean fracture load was 312.83 N for group I, 297.35 N for group II, 359.15 N for group III, 231.51 N for group IV, and 275.81 N for group V. Conclusion The fracture resistances exhibited a statistically significant difference between all the groups. Teeth instrumented by SAF exhibited a better fracture resistance. How to cite this article Tyagi S, Choudhary E, Kabra P, Chauhan R. An in vitro comparative Evaluation of Fracture Strength of Roots Instrumentated with Self-adjusting File and Reciproc Reciprocating File, with and without Obturation. Int J Clin Dent Res 2017;1(1):20-25.

scholarly journals Microshear bond strength evaluation of surface pretreated zirconia ceramics bonded to dentin

2015 ◽  
Vol 09 (02) ◽  
pp. 224-227 ◽  
Author(s):  
Shenbagakuttalam Anand ◽  
Ambrose Vedamanickam Rajesh Ebenezar ◽  
Nirupa Anand ◽  
Kothandaraman Rajkumar ◽  
Sekar Mahalaxmi ◽  
...  
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Group Iv ◽  
Zirconia Ceramics ◽  
Group V ◽  
Statistical Significant Difference ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Group Ii

ABSTRACT Objectives: To comparatively assess the micro shear bond strength (MSBS) of dentin bonded surface pre-treated zirconia ceramics. Materials and Methods: Zirconia blocks were sectioned into 50 cubical blocks. The blocks were further categorized into five groups (n = 10 each). Group I: No treatment was performed on zirconia samples; Group II: The zirconia samples were sand-blasted; Group III: Group II + etched with 9.8% of hydrofluoric (HF) acid for 60 s; Group IV: The sandblasted zirconia samples were selectively infiltrated with low fusing porcelain; and Group V: Group IV + etched using 9.8% HF acid gel. The zirconia specimens were then bonded to dentin samples, and the samples were tested for MSBS evaluation using universal testing machine. Results: The MSBS of all the four experimental groups shows greater value than group I. Among the experimental groups, group V and group IV do not show any statistical significant difference, whereas the mean MSBS of groups IV and V were statistically greater than group III and group II. However, groups I, II, and III do not show any statistical significant difference in mean MSBS values between them. Conclusion: Selective infiltration etching of zirconia ceramics provides the highest bond strength with resin cement.

ВЗАИМОСВЯЗЬ ПРОДУКТИВНЫХ ПОКАЗАТЕЛЕЙ КОРОВ ЧЕРНО-ПЕСТРОЙ ПОРОДЫ С ВОСПРОИЗВОДИТЕЛЬНЫМИ КАЧЕСТВАМИ

2019 ◽  
pp. 39-42
Author(s):  
G.Yu. BEREZKINA ◽  
S.L. VOROBYEVA ◽  
E.M. KISLYAKOVA ◽  
A.A. KOREPANOVA
Keyword(s):  
Experimental Studies ◽  
Live Weight ◽  
Group Iv ◽  
Reproductive Capacity ◽  
Group Vi ◽  
Group V ◽  
Group Iii ◽  
Group I ◽  
The Republic ◽  
Breeding Farms

Изучено влияние возраста и живой массы при первом осеменении на воспроизводительные качества коровпервотелок чернопестрой породы в племенных заводах Удмуртской Республики. Исследования проводились в период с 2015 по 2018 гг. Для проведения исследований были сформированы 6 групп животных в зависимости от возраста первого осеменения. В I группу вошли коровы с возрастом первого осеменения до 13 мес, во II от 13,1 до 15 мес, в III от 15,1 до 17, в IV от 17,1 до 19, в V от 19,1 до 21 и в VI группу от 21 мес и старше. При этом живая масса телок в I группе в среднем составила 349,5 кг, во II 370,9, в III 387,7, в IV 400,2, в V 420,7 и в VI группе 440,2 кг. Анализ возраста первого осеменения в племенных хозяйствах республики показал, что средний возраст плодотворного осеменения в 2018 году составил 17,0 мес. с живой массой 394 кг. По результатам экспериментальных исследований нами получено, что лучшие воспроизводительные показатели и молочная продуктивность выявлена у коровпервотелок, которых осеменяли в возрасте 14,6 мес. В данной группе продолжительность сервиспериода составила 127,3 дня, коэффициент воспроизводительной способности 0,90, выход телят на 100 коров составил более 85,3. Удой за 305 дней лактации, у коровпервотелок второй опытной группы составил 6332,3 кг с массовой долей жира 3,65 и белка 3,15 .The influence of age and live weight at the first insemination on reproductive qualities of cowsborn black and white breed in breeding farms of the Udmurt Republic was studied. The studies were conducted between 2015 and 2018. For the research 6 groups of animals were formed depending on the age of the first insemination. Group I included cows with the age of first insemination up to 13 months, in group II from 13.1 to 15 months, in III group from 15.1 to 17 months, in group IV from 17.1 to 19 months, in group V from 19.1 to 21 months and in VI group from 21 months and more. At the same time, the live weight of heifers in group I averaged 349.5 kg, in group II370.9 kg, in group III 387.7 kg, in group IV 400.2 kg, in group V 420.7 kg and in group VI 440.2 kg. The analysis of the age of the first insemination in breeding farms of the Republic showed that the average age of fruitful insemination in 2018 was 17.0 months with a live weight of 394 kg. According to the results of experimental studies, we obtained that the best reproductive performance and milk productivity was revealed in cows, which were inseminated at the age of 14.6 months. In this group, the duration of the service period was 127.3 days, the coefficient of reproductive capacity 0.90, yield of calves per 100 cows. Milk yield for 305 days of lactation, in cows of the second experimental group was 6332.3 kg with a mass fraction of fat 3.65 and protein 3.15.

scholarly journals The The Influence of Wharton Jelly Mesenchymal Stem Cell toward Matrix Metalloproteinase-13 and RELA Synoviocyte Gene Expression on Osteoarthritis

2019 ◽  
Vol 7 (5) ◽  
pp. 701-706 ◽  
Author(s):  
Vivi Sofia ◽  
Ellyza Nasrul ◽  
Menkher Manjas ◽  
Gusti Revilla
Keyword(s):  
Gene Expression ◽  
Stem Cell ◽  
Mesenchymal Stem Cell ◽  
Inflammatory Responses ◽  
Group Iv ◽  
Group Vi ◽  
Group V ◽  
Group Iii ◽  
Group I

BACKGROUND: Therapy for osteoarthritis (OA) with satisfactory results has not been found to date. In OA pathogenesis, RELA gene involved in cartilage degradation and MMP-13 in degrade cartilage, as a member family of NF-ĸβ genes, RELA serves to modulate inflammatory responses and activates pro-inflammatory cytokines. AIM: This study aims to identify the influence of Wharton Jelly Mesenchymal Stem Cell (MSC-WJ) on MMP-13 and RELA expression gene in synoviocyte by in vitro. MATERIAL AND METHODS: This research is pure experimental research. The sample used derived from synovial tissue of OA patients who underwent Total Knee Replacement (TKR) surgery. This study was divided into six groups treated with 4 replications. Group I and II (control groups) were synoviocyte of OA incubated for 24 and 48 hours, respectively. Group III and IV were MSC-WJ incubated for 24 and 48 hours, respectively. Group V and VI were Synoviocyte-MSC-WJ co-culture group incubated for 24 and 48 hours, respectively. Identification of MMP-13 and RELA gene expression in each group was performed by using qPCR. RESULT: The results showed that MSC-WJ reduced MMP-13 gene expression after co-culture for 24 and 48 hours in OA synoviocyte. The highest gene expression of MMP-13 was in Group I and II (1.00 ng/μl), followed by Group III (0.41 ng/μl), Group IV (0.24 ng/μl), Group V (0.13 ng/μl), and Group VI (0.04 ng/μl). MSC-WJ administration also decreased RELA gene expression. The highest gene expression of RELA gene was in Group I and II (1.00 ng/μl), Group V (0.67 ng/μl), Group III (0.58 ng/μl), Group IV (0.16 ng/μl), and Group VI (0.16 ng/μl). CONCLUSION: This study concluded that MSC-WJ in OA synoviocyte significantly reduced the expression of MMP-13 and RELA gene (p <0.05).

scholarly journals Effects of Vitamin D3 on Methotrexate- Induced Jejunum Damage in Rats

2020 ◽  
Vol 29 (1) ◽  
pp. 260-267
Author(s):  
Farah K. Abdul-Wahab ◽  
Nada N Al-Shawi
Keyword(s):  
Vitamin D3 ◽  
Inflammatory Cells ◽  
Histopathological Study ◽  
Group Vi ◽  
Group V ◽  
Once Daily ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Histopathological Studies

Both methotrexate and vitamin D3 are used in combination for the treatment of various diseases. The aim of this study is to highlight the effect of vitamin D3 on methotrexate-induced jejunum damage using biochemical and   histopathological  studies. Seven groups of both sexes of rats were selected and treated as follows: (Group I and Group II) : control 1,control 2 (I.P normal saline) daily for 14 and 21 days respectively ; (Group III and Group IV) :vitamin D3 groups (500 IU/rat/day) orally for 14 and 21 days, respectively;(Group V): once daily dose of methotrexate 20mg/kg, I.P injected for 4 days;(Group VI):vitamin D3 (500 IU/rat/day) once daily for 14 days and methotrexate (20 mg/kg I.P) injected only at day 10;.(Group VII) vitamin D3 (500 IU/rat/day) orally for 21 days and methotrexate (20 mg/kg I.P) injected only at day 17; then the jejunum was removed and used for measuring malondialdehyde (MDA) content, total antioxidant capacity (TAOC) level; in addition histopathological study of jejunum tissue. Administration of vitamin D3 for 21 days and a single dose of methotrexate at day 17 resulted in non-significant difference (P>0.05) in MDA; while significant reduction (P<0.05) in the TAOC level in jejunum tissue; furthermore , sever villi damage ,crypts abscess, epithelial atrophy , mixed inflammatory cells infiltrate and goblet cells depletion were observed in comparison with methotrexate group. So the study demonstrates that vitamin D3 plays a synergistic role with methotrexate therefore the combined use of vitamin D3 and methotrexate may be used as a strategy to overcome dose limitations and side effects when use for the treatment of cancer, rheumatoid arthritis and psoriasis. Key words: Jejunum damage, Methotrexate, Oxidative stress, Rats, Vitamin D3.

scholarly journals Behavior Assessment Amid Children Aged 0 to 3 Years in Dental Institution

2012 ◽  
Vol 3 (1) ◽  
pp. 50-54
Author(s):  
K Kiran ◽  
Swati Dwivedi ◽  
Pallavi Vashisth ◽  
Virag Bhatia
Keyword(s):  
Behavior Assessment ◽  
Age Group ◽  
Group Vi ◽  
Chi Square ◽  
Group V ◽  
Group Iii ◽  
Collaborative Behavior ◽  
Group I ◽  
Significant Difference ◽  
Chi Square Test

ABSTRACT The study was conducted to evaluate the behavior of children in age group of 0 to 3 years in dental institution. Sample sizes of 432 were selected randomly for the study, between age group of 0 to 3 years. They were divided into six groups according to their age: Group I—0 to 6 months; Group II—7 to 12 months; Group III—13 to 18 months; Group IV—19 to 24 months; Group V—25 to 30 months; Group VI—31 to 36 months. The behavior of the child was observed while his/her entrance in the dental department and during the first four clinical appointments with a clinical examination and oral hygiene therapy. The child was classified as collaborative behavior (CB) and noncollaborative behavior (NCB). Statistical analysis was performed using Pearson's Chi-square test (p < 0.005). Result showed that babies from 0 to 6 months showed a favorable behavior; babies from 7 to 30 months showed unfavorable behavior; and babies from 31 to 36 months showed no statistically significant difference between the percentage of collaborative and noncollaborative behavior. How to cite this article Kiran K, Dwivedi S, Vashisth P, Bhatia V. Behavior Assessment Amid Children Aged 0 to 3 Years in Dental Institution. World J Dent 2012;3(1):50-54.

scholarly journals Treatment of Bothrops alternatus envenomation by Curcuma longa and Calendula officinalis extracts and ar-turmerone

2005 ◽  
Vol 57 (1) ◽  
pp. 7-17 ◽  
Author(s):  
M.M. Melo ◽  
G.G. Habermehl ◽  
N.J.F. Oliveira ◽  
E.F. Nascimento ◽  
M.M.B. Santos ◽  
...  
Keyword(s):  
Curcuma Longa ◽  
Group Iv ◽  
Calendula Officinalis ◽  
Group Vi ◽  
Group V ◽  
Efficient Treatment ◽  
Sterile Saline ◽  
Group Iii ◽  
Group I ◽  
Bothrops Alternatus

It was investigated the efficiency of two extracts of plants and one fraction of their properties against the local effects of bothropic envenomation. Bothrops alternatus venom (1.25µg) diluted in 100µl of sterile saline solution was inoculated (intradermally) into the shaved dorsal back skin of 30 New Zealand rabbits. The animals were divided in six groups receiving the following treatments: group I: subcutaneous application of Curcuma longa extract (1.0ml); group II: topic treatment of Curcuma longa hydroalcoholic extract (1.0ml); group III: topic application of ar-turmerone in vaseline (1.0g); group IV: topic application of Curcuma longa methanolic extract (1.0ml); group V: topic application of Calendula officinalis ointment (1.0g); group VI: topic application of saline (1.0ml). These treatments were done at 30 minutes, and at 2, 4, 24 and 72 hours after venom inoculation. Intensity of local edema, hemorrhagic halo and necrosis were evaluated until 168h after that. Additionally, seven days after the Bothrops venom inoculation, blood was collected from heart with and without EDTA (10%) for hemogram and biochemical parameters (total protein, blood urea nitrogen, creatinine, and fibrinogen) and all the animals were anesthetized, sacrificed by ether inhalation and submitted to necropsy. Fragments of tissues were taken for histopathological evaluation. The most efficient treatment for inhibition of edema, necrosis and local hemorrhage after Bothrops alternatus venom was the topic application of ar-turmerone.

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