A Proper Increasing in the Testosterone Level May Be Associated With Better Pregnancy Outcomes for Patients With Tubal or Male Infertility During in vitro Fertilization/Intracytoplasmic Sperm Injection

We aimed to investigate the relationship between testosterone (T) levels and pregnancy outcomes in patients with tubal or male infertility at different times during in vitro fertilization (IVF)/intracytoplasmic sperm injection (ICSI) cycles. Patients with tubal or male infertility and normal androgen levels undergoing IVF/ICSI were consecutively recruited. We performed a longitudinal analysis of T levels at three time points (i.e., T0: baseline, T1: trigger day, and T2: day after the trigger day) in three groups with different pregnancy outcomes (i.e., group 1: no pregnancy; group 2: clinical pregnancy but no live birth; and group 3: live birth) as repeated measurement data using linear mixed-effects models. We also plotted fitted curves depicting the relationship between T levels and a number of oocytes retrieved at different time points and identified the inflection points of the curves. In total, 3,012 patients were recruited. Groups 1 and 3 had improvements in T levels at the three time points. After refitting, the slope in group 3 was significantly higher than that in group 1 (P = 0.000). Curves that reflected the association between T levels and numbers of retrieved oocytes presented an upward trend before a certain inflection point, after which the curves had no obvious changes or fell with increasing T levels. The inflection points for T0, T1, and T2 were calculated as 0.45, 0.94, and 1.09, respectively. A faster upward trend in T levels might be associated with better pregnancy outcomes. Within a range lower than a T level inflection point, more oocytes and embryos could be obtained with increasing T levels.

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A Proper Increasing in the Testosterone Level May Be Associated With Better Pregnancy Outcomes for in Vitro Fertilization (IVF)/intracytoplasmic Sperm Injection (ICSI) Patients With Tubal or Male Infertility

10.21203/rs.3.rs-404854/v1 ◽

2021 ◽

Author(s):

Zhiyan Chen ◽

Duoduo Zhang ◽

Zhengyi Sun ◽

Qi Yu

Keyword(s):

Male Infertility ◽

Pregnancy Outcomes ◽

Vitro Fertilization ◽

Time Points ◽

Inflection Points ◽

Group 3 ◽

The Relationship ◽

Androgen Levels ◽

Group 1

Abstract Background To investigate the relationship between androgen levels and pregnancy outcomes in patients with tubal or male infertility at different times of the in vitro fertilization (IVF)/intracytoplasmic sperm injection (ICSI) cycles. Methods Patients with tubal or male infertility but normal androgen levels receiving IVF/ICSI were continuously recruited. We made longitudinal analysis of the testosterone (T) levels at three time points (T0: basal T levels, T1: T levels on the trigger day, T2: T levels on the next day of the trigger day) in three groups with different pregnancy outcomes (Group 1: no pregnancy, Group 2: clinical pregnancy but no live birth, Group 3: live birth) as repeated measurement data using linear mixed effect models. We also plotted fitting curves depicting the relationship of the T levels and the numbers of oocytes retrieved at different time points, and the inflection points of the curves were identified. Results A total of 3012 patients were recruited in the study. Improvements in androgen levels were identified at the three-time points in Group 1 and 3. The slope in Group 3 after refitting was significantly higher than Group 1 (P = 0.000). The curves that reflected the association of androgen levels and numbers of retrieved oocytes presented an upward trend before a certain inflection point, after which the curves had no obvious changes or fell with the increase of androgen levels. The inflection points for T0, T1, T2 were calculated as 0.45, 0.94, 1.09, respectively. Conclusion The faster upward trend of the T levels might be associated with better pregnancy outcomes. Within the range of lower than a certain value of the T levels, more oocytes and embryos could be obtained with the increasing of the T levels.

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The Relationship between Serum Ferritin Levels and 5-Year All-Cause Mortality in Hemodialysis Patients

Blood Purification ◽

10.1159/000515639 ◽

2021 ◽

pp. 1-7

Author(s):

Emre Erdem ◽

Ahmet Karatas ◽

Tevfik Ecder

Keyword(s):

Serum Ferritin ◽

Hemodialysis Patients ◽

Rank Test ◽

Significant Difference ◽

All Cause Mortality ◽

Group 3 ◽

Group 2 ◽

The Relationship ◽

Group 1

Introduction: The effect of high serum ferritin levels on long-term mortality in hemodialysis patients is unknown. The relationship between serum ferritin levels and 5-year all-cause mortality in hemodialysis patients was investigated in this study. Methods: A total of 173 prevalent hemodialysis patients were included in this study. The patients were followed for up to 5 years and divided into 3 groups according to time-averaged serum ferritin levels (group 1: serum ferritin <800 ng/mL, group 2: serum ferritin 800–1,500 ng/mL, and group 3: serum ferritin >1,500 ng/mL). Along with the serum ferritin levels, other clinical and laboratory variables that may affect mortality were also included in the Cox proportional-hazards regression analysis. Results: Eighty-one (47%) patients died during the 5-year follow-up period. The median follow-up time was 38 (17.5–60) months. The 5-year survival rates of groups 1, 2, and 3 were 44, 64, and 27%, respectively. In group 3, the survival was lower than in groups 1 and 2 (log-rank test, p = 0.002). In group 1, the mortality was significantly lower than in group 3 (HR [95% CI]: 0.16 [0.05–0.49]; p = 0.001). In group 2, the mortality was also lower than in group 3 (HR [95% CI]: 0.32 [0.12–0.88]; p = 0.026). No significant difference in mortality between groups 1 and 2 was found (HR [95% CI]: 0.49 [0.23–1.04]; p = 0.063). Conclusion: Time-averaged serum ferritin levels >1,500 ng/mL in hemodialysis patients are associated with an increased 5-year all-cause mortality risk.

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THU0227 CAFFEINE INTAKE MODULATES DISEASE ACTIVITY AND CYTOKINES LEVELS IN SYSTEMIC LUPUS ERYTHEMATOSUS PATIENTS

Annals of the Rheumatic Diseases ◽

10.1136/annrheumdis-2020-eular.2100 ◽

2020 ◽

Vol 79 (Suppl 1) ◽

pp. 340.2-341

Author(s):

V. Orefice ◽

F. Ceccarelli ◽

C. Barbati ◽

R. Lucchetti ◽

G. Olivieri ◽

...

Keyword(s):

Disease Activity ◽

Lupus Erythematosus ◽

Caffeine Intake ◽

Caffeine Consumption ◽

Group 4 ◽

Group 3 ◽

Group 2 ◽

The Impact ◽

Group 1

Background:Systemic lupus erythematosus (SLE) is an autoimmune disease mainly affecting women of childbearing age. The interplay between genetic and environmental factors may contribute to disease pathogenesis1. At today, no robust data are available about the possible contribute of diet in SLE. Caffeine, one of the most widely consumed products in the world, seems to interact with multiple components of the immune system by acting as a non-specific phosphodiesterase inhibitor2.In vitrodose-dependent treatment with caffeine seems to down-regulate mRNA levels of key inflammation-related genes and similarly reduce levels of different pro-inflammatory cytokines3.Objectives:We evaluated the impact of caffeine consumption on SLE-related disease phenotype and activity, in terms of clinimetric assessment and cytokines levels.Methods:We performed a cross-sectional study, enrolling consecutive patients and reporting their clinical and laboratory data. Disease activity was assessed by SLE Disease Activity Index 2000 (SLEDAI-2k)4. Caffeine intake was evaluated by a 7-day food frequency questionnaire, including all the main sources of caffeine. As previously reported, patients were divided in four groups according to the daily caffeine intake: <29.1 mg/day (group 1), 29.2-153.7 mg/day (group 2), 153.8-376.5 mg/day (group 3) and >376.6 mg/day (group 4)5. At the end of questionnaire filling, blood samples were collected from each patient to assess cytokines levels. These were assessed by using a panel by Bio-Plex assays to measure the levels of IL-6, IL-10, IL-17, IL-27, IFN-γ, IFN-α and Blys.Results:We enrolled 89 SLE patients (F/M 87/2, median age 46 years, IQR 14; median disease duration 144 months, IQR 150). The median intake of caffeine was 195 mg/day (IQR 160.5). At the time of the enrollment, 8 patients (8.9%) referred a caffeine intake < 29.1 mg/day (group 1), 27 patients (30.3%) between 29.2 and 153.7 mg/day (group 2), 45 patients (51%) between 153.8 and 376.5 mg/day (group 3) and 9 patients (10.1%) >376.6 mg/day (group 4). A negative correlation between the levels of caffeine and disease activity, evaluated with SLEDAI-2K, was observed (p=0.01, r=-0.26). By comparing the four groups, a significant higher prevalence of lupus nephritis, neuropsychiatric involvement, haematological manifestations, hypocomplementemia and anti-dsDNA positivity was observed in patients with less intake of caffeine (figure 1 A-E). Furthermore, patients with less intake of caffeine showed a significant more frequent use of glucocorticoids [group 4: 22.2%,versusgroup 1 (50.0%, p=0.0001), group 2 (55.5%, p=0.0001), group 3 (40.0%, p=0.009)]. Moving on cytokines analysis, a negative correlation between daily caffeine consumption and serum level of IFNγ was found (p=0.03, r=-0.2) (figure 2A); furthermore, patients with more caffeine intake showed significant lower levels of IFNα (p=0.02, figure 2B), IL-17 (p=0.01, figure 2C) and IL-6 (p=0.003, figure 2D).Conclusion:This is the first report demonstrating the impact of caffeine on SLE disease activity status, as demonstrated by the inverse correlation between its intake and both SLEDAI-2k values and cytokines levels. Moreover, in our cohort, patients with less caffeine consumption seems to have a more severe disease phenotype, especially in terms of renal and neuropsychiatric involvement. Our results seem to suggest a possible immunoregulatory dose-dependent effect of caffeine, through the modulation of serum cytokine levels, as already suggested byin vitroanalysis.References:[1]Kaul et alNat. Rev. Dis. Prim.2016; 2. Aronsen et alEurop Joul of Pharm2014; 3. Iris et alClin Immun.2018; 4. Gladman et al J Rheumatol. 2002; 5. Mikuls et alArth Rheum2002Disclosure of Interests:Valeria Orefice: None declared, Fulvia Ceccarelli: None declared, cristiana barbati: None declared, Ramona Lucchetti: None declared, Giulio Olivieri: None declared, enrica cipriano: None declared, Francesco Natalucci: None declared, Carlo Perricone: None declared, Francesca Romana Spinelli Grant/research support from: Pfizer, Consultant of: Novartis, Gilead, Lilly, Sanofi, Celgene, Speakers bureau: Lilly, cristiano alessandri Grant/research support from: Pfizer, Guido Valesini: None declared, Fabrizio Conti Speakers bureau: BMS, Lilly, Abbvie, Pfizer, Sanofi

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Evaluation of Gingival Microleakage in Class II Composite Restorations with Different Lining Techniques: An In Vitro Study

Scientifica ◽

10.1155/2015/896507 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6

Author(s):

Vedavathi Bore Gowda ◽

B. V. Sreenivasa Murthy ◽

Swaroop Hegde ◽

Swapna Devarasanahalli Venkataramanaswamy ◽

Veena Suresh Pai ◽

...

Keyword(s):

Study Groups ◽

Class Ii ◽

Composite Liner ◽

Flowable Composite ◽

Composite Restorations ◽

Group 4 ◽

Group 3 ◽

Group 2 ◽

Group 1

Aim. To compare the microleakage in class II composite restorations without a liner/with resin modified glass ionomer and flowable composite liner.Method. Forty standardized MO cavities were prepared on human permanent mandibular molars extracted for periodontal reasons and then divided into 4 groups of ten specimens. The cavity preparations were etched, rinsed, blot dried, and light cured and Adper Single Bond 2 is applied. Group 1 is restored with Filtek P60 packable composite in 2 mm oblique increments. Group 2 is precure group where 1 mm Filtek Z350 flowable liner is applied and light cured for 20 sec. Group 3 is the same as Group 2, but the liner was cocured with packable composite. In Group 4, 1 mm RMGIC, Fuji Lining LC is applied and cured for 20 sec. All the teeth were restored as in Group 1. The specimens were coated with nail varnish leaving 1 mm around the restoration, subjected to thermocycling, basic fuchsin dye penetration, sectioned mesiodistally, and observed under a stereomicroscope.Results. The mean leakage scores of the individual study groups were Group 1 (33.40), Group 2 (7.85), Group 3 (16.40), and Group 4 (24.35). Group 1 without a liner showed maximum leakage. Flowable composite liner precured was the best.

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Experimental Reproduction of Bovine Fetal Neospora Infection and Death with a Bovine Neospora Isolate

Journal of Veterinary Diagnostic Investigation ◽

10.1177/104063879400600212 ◽

1994 ◽

Vol 6 (2) ◽

pp. 207-215 ◽

Cited By ~ 91

Author(s):

Bradd C. Barr ◽

Joan D. Rowe ◽

Karen W. Sverlow ◽

Robert H. BonDurant ◽

Alex A. Ardans ◽

...

Keyword(s):

Uninfected Cell ◽

In Utero ◽

Pathogenic Potential ◽

Group 4 ◽

Fetal Infection ◽

Group 3 ◽

Group 2 ◽

Protozoal Infection ◽

Group 1

Studies were conducted to determine the pathogenic potential of the recently isolated bovine Neospora protozoa (BPA-1) for the bovine fetus. Cows chosen for study had Neospora titers < 160 using an indirect immunofluorescent antibody (IFA) test. Four experimental groups were studied. In group 1, 2 fetuses were inoculated in utero at 118 days gestation with culture-derived Neospora tachyzoites. A pregnant control cow was housed in the same pen, observed daily and screened serologically for evidence of exposure to Neospora. In group 2, 2 cows were infected with Neospora tachyzoites at 138 or 161 days gestation, and 1 control cow was given uninfected cell culture suspension simultaneously at 154 days gestation. Groups 3 (85 days gestation) and 4 (120 days gestation) each consisted of 2 cows infected with Neospora tachyzoites and 1 control cow given uninfected material at the same stage of gestation. Dead fetuses were surgically removed from the infected cows in group 1 on postinfection day (PID) 17. The histopathology was compatible with protozoal fetal infection, and protozoa were identified by immunohistochemistry. Viable fetuses were removed surgically from cows in group 2 on PID 28-30. The histopathology was compatible with protozoal fetal infection, protozoa were identified by immunoperoxidase techniques, and Neospora tachyzoites were reisolated in vitro from tissues of the 2 infected fetuses. In groups 3 and 4, the control fetus and 1 infected fetus were removed surgically between PID 26 and PID 33. The remaining infected cows were observed until fetal death or abortion occurred. In group 3, the fetus that was surgically removed from 1 infected cow had no pathologic abnormalities, and parasites were not found (PID 26). The second fetus in group 3 died in utero, and expulsion of a mummified fetus was induced on PID 67. Brain histopathology was compatible with protozoal infection, and parasites were identified by immunoperoxidase techniques. The fetus that was surgically removed (PID 32) from 1 infected cow in group 4 had lesions compatible with protozoal infection, and Neospora tachyzoites were reisolated in vitro from fetal tissues. The second infected cow in group 4 produced a full-term live calf that had a precolostral Neospora titer of 20,480. Clinically, this calf had depressed conscious proprioception in all limbs. Very mild lesions were found in the central nervous system, but protozoa were not found in the tissues. The results demonstrate that the bovine Neospora protozoa can be transplacentally transmitted, resulting in fetal infection and death, and mimics the naturally occurring fetal disease.

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Comparative Evaluation of Cleaning Efficacy of Three Different Single File Systems: An In Vitro Study

Journal of Advances in Medicine and Medical Research ◽

10.9734/jammr/2021/v33i1230937 ◽

2021 ◽

pp. 26-31

Author(s):

Deebah Choudhary

Keyword(s):

File Systems ◽

In Vitro Study ◽

Single File ◽

Working Length ◽

Group 3 ◽

Group 2 ◽

Cleaning Efficacy ◽

Scanning Electron ◽

Group 1

Aim: The aim of this study was to evaluate the canal cleaning efficacy of these three file systems using scanning electron microscopy. Place and Duration of Study: The study was conducted in the Department of Conservative dentistry and Endodontics, Institute of Dental Sciences Sehora, between October 2020 and December 2020. Materials and Methods: Access cavity preparation was performed on sixty extracted human mandibular premolar teeth and working length was determined. The samples were randomly divided into three groups (n=20) depending upon the file system used i.e. Group 1 (Reciproc Blue), Group 2 (Waveone Gold) and Group 3 (F360). Samples were split into two halves by creating longitudinal grooves on the buccal and lingual surfaces. The samples were sputter-coated with gold and examined under scanning electron microscope at 5000X. The dentinal wall of root canal at coronal, middle and apical thirds of each sample were evaluated for the presence of determining the canal cleanliness and then analyzed using a five-score index. Results: The results of this study revealed that Group 1 (Reciproc Blue) exhibited better cleaning efficacy than samples of Group 2 (WaveOne Gold) and Group 3 (F360) at different locations in the canal i.e. coronal, middle and apical. The mean debris present was highest in coronal area for both group 2 and group 3 i.e. 2.1 and least was seen in apical area of group 1 i.e. 0.3. (p<0.05) Conclusion: Reciproc Blue single-file showed highest cleaning efficacy followed by Waveone Gold and F360. Reciproc file also showed effective cleaning in the apical third of the canal.

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Association Between Serum Oestradiol Level on the Human Chorionic Gonadotrophin Administration Day and Neonatal Birthweight After in Vitro Fertilization-embryo Transfer: A Retrospective Study of 3659 Singleton Live Births

10.21203/rs.3.rs-93396/v1 ◽

2020 ◽

Author(s):

Yu Liu ◽

Jing Li ◽

Yihong Guo

Keyword(s):

Retrospective Study ◽

Chorionic Gonadotrophin ◽

Human Chorionic Gonadotrophin ◽

Vitro Fertilization ◽

Group 4 ◽

Group 3 ◽

Group 2 ◽

Ivf Et ◽

Group 1

Abstract BackgroundOestradiol, an important hormone in follicular development and endometrial receptivity, is closely related to clinical outcomes of fresh in vitro fertilization-embryo transfer (IVF-ET) cycles. A supraphysiologic E2 level is inevitable during controlled ovarian hyper-stimulation (COH), and its effect on the outcome of IVF-ET is controversial. The aim of this retrospective study is to evaluate the association between elevated serum oestradiol (E2) levels on the day of human chorionic gonadotrophin (hCG) administration and neonatal birthweight after IVF-ET cycles.MethodsThe data of 3659 infertile patients with fresh IVF-ET cycles were analysed retrospectively between August 2009 and February 2017 in First Hospital of Zhengzhou University. Patients were categorized by serum E2 levels on the day of hCG administration into six groups: group 1 (serum E2 levels≤1000 pg/mL, n=230), group 2 (serum E2 levels between 1001 and 2000 pg/mL, n=524), group 3 (serum E2 levels between 2001 and 3000 pg/mL, n=783), group 4 (serum E2 levels between 3001 and 4000 pg/mL, n = 721), group 5 (serum E2 levels between 4001 and 5000 pg/mL, n=548 ), and group 6 (serum E2 levels > 5000 pg/mL, n=852). Univariate linear regression was used to evaluate the independent correlation between each factor and outcome index. Multiple logistic regression was used to adjust for confounding factors.ResultsThe LBW rates were as follows: 3.0% (group 1), 2.9% (group 2), 1.9% (group 3), 2.9% (group 4), and 2.0% (group 6) (P =0.629), respectively. There were no statistically significant differences in the incidences of neonatal LBW among the six groups. We did not detect an association between peak serum E2 level during ovarian stimulation and neonatal birthweight after IVF-ET.ConclusionThe results of this retrospective cohort study showed that serum E2 peak levels during ovarian stimulation were not associated with birth weight during IVF cycles. In addition, no association was found between higher E2 levels and increased LBW risk. Our observations suggest that the hyper-oestrogenic milieu during COS does not seem to have adverse effects on the birthweight of offspring after IVF.

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Inverse Relationship between Adenoid Size and Asthma or Atopy in Children: A Preliminary Study

Korean Journal of Otorhinolaryngology - Head and Neck Surgery ◽

10.3342/kjorl-hns.2019.00913 ◽

2020 ◽

Vol 63 (9) ◽

pp. 409-414

Author(s):

Yangseop Noh ◽

Ji-Eun Choi ◽

Kyung Eun Lee ◽

Seung-Kyu Chung ◽

Sang Duk Hong ◽

...

Keyword(s):

Medical Center ◽

Allergic Sensitization ◽

Allergic Diseases ◽

Adenoid Hypertrophy ◽

Group 4 ◽

Group 3 ◽

Group 2 ◽

Diagnosis Criteria ◽

The Relationship ◽

Group 1

Background and Objectives One of the most common surgical procedures in children is adenoidectomy, but the causes of adenoid hypertrophy are not fully understood. Some studies have found that allergies can be a risk factor for adenoid hypertrophy, asthma being one of these allergic diseases. This study aimed to investigate the relationship between adenoid size and asthma in a group of children.Subjects and Method This study reviewed a total of 2063 pediatric patients with or without atopy and asthma who visited the Otorhinolaryngology and Pediatric unit at a tertiary medical center from January 2011 to June 2016. We classified these patients into 4 groups according to the presence of asthma or atopy and randomly selected 100 patients from each group (to a total of 400 pts): group 1 (asthma-, atopy-); group 2 (asthma-, atopy+); group 3 (asthma+, atopy-) and group 4 (asthma+, atopy+). The presence of allergic sensitization (atopy) was evaluated by CAP test and total IgE. Asthma was diagnosed according to the diagnosis criteria in the Korean guideline for asthma. Adenoid size was evaluated with the adenoidal-nasopharyngeal ratio (A/N ratio) by the adenoid view.Results The four groups did not differ from each other significantly in age or sex. There was a negative correlation between adenoid size and atopic and asthmatic condition. Group 1 had a significantly larger A/N ratio than the other groups (group 1=0.534±0.138; group 2=0.469± 0.140; group 3=0.476±0.135; group 4=0.482±0.128, p<0.05). However, group 4 showed nearly identical results to groups 2 and 3, despite the combination of asthma and atopy in group 4.Conclusion Large adenoids were negatively associated with atopy and asthma. This finding may be explained by a decrease in adenoid stimulation by nasal obstruction and a difference in the immune system, including allergic immune reactions. Further studies are needed.

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Pharmacokinetics and safety of XAV-19, a swine glyco-humanized polyclonal anti-SARS-CoV-2 antibody, for COVID-19-related moderate pneumonia: a randomized, double-blind, placebo-controlled, phase IIa study

Antimicrobial Agents and Chemotherapy ◽

10.1128/aac.01237-21 ◽

2021 ◽

Author(s):

Benjamin Gaborit ◽

Eric Dailly ◽

Bernard Vanhove ◽

Régis Josien ◽

Karine Lacombe ◽

...

Keyword(s):

Adverse Events ◽

High Serum ◽

Serum Concentrations ◽

Serious Adverse Events ◽

Double Blind ◽

Good Tolerability ◽

Group 3 ◽

Group 2 ◽

Group 1

Objective: We assessed the pharmacokinetics and safety of XAV-19, a swine glyco-humanized polyclonal antibody against SARS-CoV-2, in COVID-19-related moderate pneumonia. To evaluate the optimal dose and safety of XAV-19 during this first administration to patients with COVID-19-related moderate pneumonia. Methods : In this phase 2a trial, adults with COVID-19-related moderate pneumonia of ≤10 days duration were randomized to infusion of XAV-19 0.5mg/kg at day 1 and day 5 (group 1), 2mg/kg at day 1 and day 5 (group 2), 2mg/kg at day 1 (group 3) or placebo. Results : Eighteen patients (n=7 for group 1, n=1 for group 2, n=5 for group 3, and n=5 for placebo) were enrolled. Baseline characteristics were similar across groups, XAV-19 serum concentrations (μg/mL, median, range) at C max and at day 8 were 9.1 (5.2-18.1) and 6.4 (2.8-11.9), 71.5 and 47.2, and 50.4 (29.1-55.0) and 20.3 (12.0-22.7) for groups 1, 2 and 3, respectively (p=0.012). Terminal half-life (median, range) was estimated at 11.4 (5.5-13.9) days for 2 mg/kg of XAV-19 at day 1. Serum XAV-19 concentrations were above the target concentration of 10 μg/mL (tow fold the in vitro 100% inhibitory concentration [IC 100 ]) from the end of perfusion to more than 8 days for XAV-19 2 mg/kg at day 1. No hypersensitivity or infusion-related reactions were reported during treatment, there was no discontinuation for adverse events and no serious adverse events related to study drug. Conclusions : Single intravenous dose of 2mg/kg of XAV-19 demonstrated high serum concentrations, predictive of potent durable neutralizing activity with good tolerability. Trial registration: ClinicalTrials.gov Identifier: NCT04453384

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Shear Bond Strength Comparison between Two Orthodontic Adhesives and Self-Ligating and Conventional Brackets

The Angle Orthodontist ◽

10.2319/022406-79 ◽

2007 ◽

Vol 77 (4) ◽

pp. 701-706 ◽

Cited By ~ 23

Author(s):

Rodney G. Northrup ◽

David W. Berzins ◽

Thomas Gerard Bradley ◽

William Schuckit

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

Orthodontic Adhesives ◽

Significant Difference ◽

Conventional Brackets ◽

Group 3 ◽

Group 2 ◽

Post Hoc ◽

Group 1

Abstract Objective: To evaluate and compare the shear bond strengths of two adhesives using two types of brackets: a conventional and a self-ligating bracket system. Materials and Methods: Sixty extracted human premolars were collected. The premolars were randomly divided into three groups of 20 teeth. All three groups were direct bonded. Groups 1 and 2 used light-cured adhesive and primer (Transbond XT) with a conventional (Orthos) and a self-ligating bracket (Damon 2), respectively. Group 3 used a light-cured primer (Orthosolo) and a light-cured adhesive (Blūgloo) with a self-ligating bracket (Damon 2). The specimens were stored in distilled water at 37°C for 40 ± 2 hours, after which they were debonded and inspected for Adhesive Remnant Index (ARI) scoring. Results: The mean shear bond strength was 15.2 MPa for group 1, 23.2 MPa for group 2, and 24.8 MPa for group 3. A one-way analysis of variance and post hoc Tukey test showed significant differences in bond strength (P < .001) between group 1 and groups 2 and 3 but no significant difference (P > .05) between groups 2 and 3. A Weibull analysis demonstrated that all three groups provided sufficient bond strength with over 90% survival rate at normal masticatory and orthodontic force levels. A Kruskal-Wallis test showed no significant difference (P > .05) in ARI scores among all three groups. Conclusions: All three groups demonstrated clinically acceptable bond strength. The Damon 2 self-ligating bracket exhibited satisfactory in vitro bond strength with both adhesive systems used.

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