Effect of Substrate Age and Adhesive Composition on Dentin Bonding

2013 ◽  
Vol 38 (3) ◽  
pp. 267-274 ◽  
Author(s):  
J Perdigão ◽  
Ana Sezinando ◽  
Paulo C Monteiro
Keyword(s):  
Age Groups ◽  
Control Group ◽  
Age Group ◽  
Single Bond ◽  
Human Teeth ◽  
Adhesive Composition ◽  
Dentin Adhesives ◽  
Significant Difference ◽  
Post Hoc ◽  
Substrate Age

SUMMARY Purpose To study the effect of dentin age and adhesive composition on the microtensile dentin bond strengths (μTBS) of five dentin adhesives. Materials and Methods Sixty extracted caries-free human teeth were assigned to the appropriate age group: less than 21 years of age (<21), 21–40 years of age (21–40), and greater than 40 years of age (>40). For each age group, specimens were randomly divided into five dentin adhesives: (1) Adper Easy Bond (EB, 3M ESPE), a one-step self-etch adhesive; (2) Experimental Adper Easy Bond without the Vitrebond Co-polymer (CP) (EBnoCP, 3M ESPE); (3) Adper Single Bond Plus (SB, 3M ESPE), a two-step etch&rinse adhesive; (4) Experimental Adper Single Bond Plus without CP (SBnoCP, 3M ESPE); and (5) Adper Scotchbond Multi-Purpose (MP, 3M ESPE), a three-step etch&rinse adhesive, as the control group. Specimens were sectioned in X and Y directions and the resulting beams were tested to failure in tension mode at a crosshead speed of 1 mm/min. Statistical analysis was computed using t-test and two-way analysis of variance followed by Fisher least significant difference multiple comparison post hoc test at p < 0.05. Results The highest mean μTBS values were obtained in the control group (MP) for all age groups. EB resulted in statistically similar mean μTBS compared to EBnoCP for all age groups: p = 0.538 for (<21); p = 0.974 for (21–40); and p = 0.909 for (>40). SB resulted in statistically higher mean μTBS than SBnoCP for all age groups [p<0.009 for (<21); p<0.028 for (21–40); and p<0.041 for (>40)]. MP, the control group, resulted in statistically lower mean μTBS when applied to the oldest age group (>40) compared to the youngest age group (<21), at p < 0.04. When means were pooled for the variable ‘age group,' SB resulted in significantly higher mean μTBS than SBnoCP at p < 0.009, while EB resulted in statistically similar mean μTBS compared to EBnoCP (p=0.9). MP resulted in statistically higher mean μTBS than all other adhesives—SB (p<0.0001), SBnoCP (p<0.0001), EBnoCP (p<0.022), and EB (p<0.046). Conclusions The substrate age influenced the bonding ability of the three-step etch&rinse adhesive. The presence of a carboxylic-based polymer (CP) enhanced the bonding ability of the two-step etch&rinse adhesive.

scholarly journals Comparison of Antimicrobial Efficacy of Calcium Hydroxide and 2% Chlorhexidine as Medicaments

2018 ◽  
Vol 5 (2) ◽  
pp. 8-11
Author(s):  
Rupan Tripathi ◽  
Vanita Gautam ◽  
V. K. Pahwa ◽  
Vikas Agrhari ◽  
Manu Batra ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Normal Saline ◽  
Antimicrobial Efficacy ◽  
Control Group ◽  
Medical Sciences ◽  
Human Teeth ◽  
Honestly Significant Difference ◽  
Significant Difference ◽  
Post Hoc ◽  
Chlorhexidine Gel

INTRODUCTION: The use of intracanal medicaments help in elimination of bacteria that remain even after cleaning and shaping. This study isdone to compare the antimicrobial efficacy of2% chlorhexidine gel and calcium hydroxide as an intracanal medicament against E.faecalis.MATERIAL  & METHODS: Sixty extracted single-rooted human teeth were prepared with standard method. After contaminating the canals with E. Faecalis and incubated for seven days, the samples were divided into four groups (n=15). Normal saline was used as control group. The teeth in each group were treated with normal saline, calcium hydroxide and 2% chlorhexidine gel. Microbial samples were obtained from the dentinal shavings of root and colony forming units (CFU) of E.faecalis were recorded after 24hrs, 72hrs and 7 days.RESULTS: To determine the significance of the differences between the different groups, ANOVA(Analysis of variance) and Tukeys Honestly significant Difference (HSD) Post hoc test were performed. Mean CFU of calcium hydroxide group and 2% chlorhexidine group was statistically significantly different from CFU of all other groups (p<0.01).CONCLUSION: Mean CFU of calcium hydroxide was found to increase at 24 hrs and decreases at 72 hrs and 7 days.The antimicrobial efficacy 2% chlorhexidine gel was better than calcium hydroxide paste.Journal of Universal College of Medical Sciences (2017)Vol.05 No.02 Issue 16, Page: 8-11

scholarly journals Placental Vascular Obstructive Lesions: Risk Factor for Developing Necrotizing Enterocolitis

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Laure Dix ◽  
Matthias Roth-Kleiner ◽  
Maria-Chiara Osterheld
Keyword(s):  
Risk Factor ◽  
Preterm Infants ◽  
Necrotizing Enterocolitis ◽  
Premature Infants ◽  
Strong Association ◽  
Age Groups ◽  
Control Group ◽  
Age Group ◽  
Significant Difference ◽  
And Control

Necrotizing enterocolitis (NEC) is a severe neonatal disease affecting particularly preterm infants. Its exact pathogenesis still remains unknown. In this study, we have compared the prevalence of vascular obstructive lesions in placentae of premature newborns which developed NEC and of a control group. We further compared separately the findings of placentae of infants of less than 30 weeks of gestation, the age group in which NEC occurs most frequently. We found signs of fetal vascular obstructive lesions in 65% of the placentae of preterm patients developing NEC, compared to only 17% of the placentae of preterm patients in the control group. In the age groups below 30 weeks of gestation, 58.5% of placentae of later NEC patients presented such lesions compared to 24.5% in the control group. The significant difference between NEC and control group suggests a strong association between fetal vascular obstructive lesions and NEC. Therefore, we propose that fetal vascular obstructive lesions might be considered as a risk factor for the development of NEC in premature infants.

The Effect of Etching Time to Durability of Dentin Adhesives

2007 ◽  
Vol 361-363 ◽  
pp. 869-872
Author(s):  
J.R. Kim ◽  
M.R. Jung ◽  
Sang Jin Park ◽  
K.K. Choi
Keyword(s):  
Bond Strength ◽  
Etching Time ◽  
Control Group ◽  
Single Bond ◽  
Microtensile Bond Strength ◽  
Dentin Adhesives ◽  
Significant Difference ◽  
One Step ◽  
Bonding Systems ◽  
Total Etching

The purpose of this study was to evaluate the effect of different etching times on microtensile bond strength(μTBS) to dentin both initial and after thermocycling with 3 different types of total-etching adhesives. Fifty four teeth were divided into 18 groups according to 3 etching times(5, 15, 25sec), 3 types of adhesives(Scotchbond Multipurpose(SM), Single Bond(SB), One-Step(OS)), and thermocycling(0, 2,000cycles). Following the bonding procedure, the specimens were bonded using Z250 composite. Half of them were not thermocycled (control group) and the others were subjected to 2,000 thermocycle (experimental group) and processed for microtensile bond strength testing. The microtensile bond strength(MPa) by different etching time(5, 15, 25s) was 37.7±9.1, 34.3±10.9 and 30.5±7.5 using Scotchbond Multipurpose(SM), 34.6±10.1, 33.8±7.6, 35.3±9.9 using single bond(SB) and 34.3±7.6, 31.3±8.5, 35.8±11.0 using one step(OS). After 2000 thermocycling the specimens, the microtensile bond strength(MPa) was decreased for all dentin bonding systems tested. But when specimens were bonded with OS, there is no significant difference between microtensile bond strength of the groups with the different etching times(5, 15, 25s) (28.2±7.8a , 29.1±8.6a and 28.2±9.4a). And the microtensile bond strength of the groups using SM, SB was decreased significantly when the etchant was applied for 25 sec(p<0.05). After all, the adhesive durability for dentin could be affected by type of solvents in adhesive and etching time. Especially, extended etching time may deteriorate dentin bond strength when ethanol-based adhesive was used

scholarly journals Sociodemographic Comparison in Patients with Subjective and Objective Clinical Findings of Temporomandibular Dysfunctions

2011 ◽  
Vol 05 (04) ◽  
pp. 380-386 ◽  
Author(s):  
Sevgi Sener ◽  
Faruk Akgunlu
Keyword(s):  
Daily Life ◽  
Smoking Habit ◽  
Age Groups ◽  
Female Gender ◽  
Clinical Findings ◽  
Gender Effects ◽  
Control Group ◽  
Age Group ◽  
Significant Difference ◽  
Myofacial Pain

ABSTRACTObjectives: To investigate the differences in healthy persons and patients with myofacial pain without limitation, objective signs of temporomandibular dysfunctions (TMDs), and both subjective and objective features with respect to age, gender, effects of TMDs on daily life, economic condition, smoking habit, marital status, and education. Methods: Sociodemographic information of 296 persons (212 females and 84 males) was evaluated. Subjects were categorized into 4 groups according to clinical findings: no TMD symptoms (control, C); myofacial pain without limitation (MP); objective signs (PWOS); or both subjective and objective features (MP/PWOS). Results: The C, MP, PWOS, and MP/PWOS groups comprised 64 (22%), 66 (22%), 68 (23%), and 98 (33%) subjects. PWOS and MP/PWOS differed significantly between the 15–30 and 30–45 year age groups. Although patients with PWOS were significantly higher in the 15–30 year age group, patients with MP/PWOS were significantly higher in the 30–45 year age group. A significant difference was observed with respect to gender in all groups except the control group. The effects of TMD symptoms on daily life differed statistically among the groups. Conclusions: Female gender is a risk factor for TMDs. Females are more vulnerable to subjective and objective signs than males. During general dental examinations, females should be checked for TMD symptoms. PWOS manifest before MP. Moreover, mechanical derangements can cause myofacial pain. MP can mostly affect daily life, but PWOS tend to be prohibitive. (Eur J Dent 2011;5:380-386)

Clinical Measurement of Maximum Mouth Opening in Children Aged 6–12

2021 ◽  
Vol 45 (3) ◽  
pp. 216-220
Author(s):  
Syed Aliya ◽  
Harsimran Kaur ◽  
Nishita Garg ◽  
Rishika ◽  
Ramakrishna Yeluri
Keyword(s):  
Age Groups ◽  
Mouth Opening ◽  
Age Group ◽  
Significance Level ◽  
Significant Difference ◽  
Group 3 ◽  
Bonferroni Test ◽  
The Mean ◽  
Group 2 ◽  
Post Hoc

Objective: To evaluate the clinical maximum mouth opening in children and its correlation with age, and sex. Study Design: Three hundred children of age 6–12 years, from different schools of Moradabad city were included. The participants were divided into three groups based on their age i.e Group 1 (n=100) 6–8 years, Group 2 (n=100) 8–10 years and Group 3 (n=100) 10–12 yrs. Three recordings of maximum mouth opening (MMO) were obtained using digital vernier caliper and the mean of three was considered as the MMO of that child. The data was analyzed using Spearman correlation, ANOVA with post- hoc Bonferroni test. The significance level was predetermined at p≤0.05 .Results: The mean MMO for children of Moradabad of aged 6–8yrs in boys is 39.87 ± 4.91 mm and in girls is 36.85± 4.09 mm. In 8–10 yeas age group, the MMO in boys is 44.5± 5.1 mm and in girls 41.77± 5.24 mm. In 10–12 year age group, the MMO in boys is 49.63± 5.56 mm and in girls is 49.33±5.32 mm respectively. The MMO was found to be higher in boys in all the three age groups. Conclusions: There was a significant difference in values of MMO in all the three age groups with boys having higher MMO values when compared to girls. Varying range of MMO values was observed within three age groups.

Effects of Short-Term Practice With a Tonic Drone Accompaniment on Middle and High School Violin and Viola Intonation

2019 ◽  
Vol 9 (1) ◽  
pp. 51-61
Author(s):  
John-Rine A. Zabanal
Keyword(s):  
High School ◽  
High School Students ◽  
Age Groups ◽  
Age Group ◽  
Years Of Experience ◽  
Short Term ◽  
School Students ◽  
Post Hoc Analysis ◽  
Significant Difference ◽  
Post Hoc

The purpose of this study was to investigate the effect of tonic drone accompaniment on the intonation of violinists and violists. Twenty-eight middle and high school students performed an ascending diatonic line and a descending dominant 7th arpeggio on the violin or viola in three trials: pretest, posttest accompanied with drone, and posttest unaccompanied. The students were grouped based on age and years of experience. A significant difference in cent deviation scores was found between age groups but not years of experience. Post hoc analysis revealed a significant difference between the middle-age group and the youngest group. No significant difference was found overall between pretest, drone accompanied posttest, and unaccompanied posttest conditions.

Clinical Impact of Co-medication of Levetiracetam and Clobazam with Proton Pump Inhibitors: A Drug Interaction Study

2020 ◽  
Vol 21 (2) ◽  
pp. 126-131
Author(s):  
Bhuvanachandra Pasupuleti ◽  
Vamshikrishna Gone ◽  
Ravali Baddam ◽  
Raj Kumar Venisetty ◽  
Om Prakash Prasad
Keyword(s):  
Plasma Concentration ◽  
Proton Pump Inhibitors ◽  
Proton Pump ◽  
Plasma Concentrations ◽  
Control Group ◽  
Drug Concentrations ◽  
Significant Difference ◽  
Post Hoc ◽  
Hydrolysis Of ◽  
Cytochrome P 450

Background: Clobazam (CLBZ) metabolized primarily by Cytochrome P-450 isoenzyme CYP3A4 than with CYP2C19, Whereas Levetiracetam (LEV) is metabolized by hydrolysis of the acetamide group. Few CYP enzymes are inhibited by Proton Pump Inhibitors (PPIs) Pantoprazole, Esomeprazole, and Rabeprazole in different extents that could affect drug concentrations in blood. The aim of the present study was to evaluate the effect of these PPIs on the plasma concentrations of LEV and CLBZ. Methods: Blood samples from 542 patients were included out of which 343 were male and 199 were female patients and were categorized as control and test. Plasma samples analyzed using an HPLC-UV method. Plasma concentrations were measured and compared to those treated and those not treated with PPIs. One way ANOVA and games Howell post hoc test used by SPSS 20 software. Results: CLBZ concentrations were significantly 10 folds higher in patients treated with Pantoprazole (P=0.000) and 07 folds higher in patients treated with Esmoprazole and Rabeprazole (P=0.00). Whereas plasma concentration of LEV control group has no statistical and significant difference when compared to pantoprazole (P=0.546) and with rabeprazole and esomeprazole was P=0.999. Conclusion: The effect of comedication with PPIs on the plasma concentration of clobazam is more pronounced for pantoprazole to a greater extent when compared to esomeprazole and rabeprazole. When pantoprazole is used in combination with clobazam, dose reduction of clobazam should be considered, or significance of PPIs is seen to avoid adverse effects.

scholarly journals Biomechanical properties of the bone during implant placement

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ádám László Nagy ◽  
Zsolt Tóth ◽  
Tamás Tarjányi ◽  
Nándor Tamás Práger ◽  
Zoltán Lajos Baráth
Keyword(s):  
Bone Structure ◽  
Biomechanical Properties ◽  
Control Group ◽  
Dynamic Tests ◽  
Bone Model ◽  
Implant Placement ◽  
Significant Difference ◽  
Before And After ◽  
Group 2 ◽  
Post Hoc

Abstract Background In this research the biomechanical properties of a bone model was examined. Porcine ribs are used as experimental model. The objective of this research was to investigate and compare the biomechanical properties of the bone model before and after implant placement. Methods The bone samples were divided in three groups, Group 1 where ALL-ON-FOUR protocol was used during pre-drilling and placing the implants, Group 2 where ALL-ON-FOUR protocol was used during pre-drilling, and implants were not placed, and Group 3 consisting of intact bones served as a control group. Static and dynamic loading was applied for examining the model samples. Kruskal–Wallis statistical test and as a post-hoc test Mann–Whitney U test was performed to analyze experimental results. Results According to the results of the static loading, there was no significant difference between the implanted and original ribs, however, the toughness values of the bones decreased largely on account of predrilling the bones. The analysis of dynamic fatigue measurements by Kruskal–Wallis test showed significant differences between the intact and predrilled bones. Conclusion The pre-drilled bone was much weaker in both static and dynamic tests than the natural or implanted specimens. According to the results of the dynamic tests and after a certain loading cycle the implanted samples behaved the same way as the control samples, which suggests that implantation have stabilized the skeletal bone structure.

scholarly journals LINEA ALBA COLLAGEN ASSESSMENT IN MORBIDLY OBESE PATIENTS

2016 ◽  
Vol 29 (suppl 1) ◽  
pp. 8-11
Author(s):  
João Vicente Machado GROSSI ◽  
Felipe Fernandes NICOLA ◽  
Ivan Alberto ZEPEDA ◽  
Martina BECKER ◽  
Eduardo Neubarth TRINDADE ◽  
...  
Keyword(s):  
Subcutaneous Tissue ◽  
Healing Process ◽  
Age Groups ◽  
Immunohistochemical Analysis ◽  
Control Group ◽  
Morbidly Obese ◽  
Obese Patients ◽  
Age Group ◽  
Tissue Thickness ◽  
Linea Alba

ABSTRACT Background: The evaluation of collagen in the abdominal wall has been increasingly studied because of the relevance on collagen in the healing process after laparotomy. Aim: To evaluate the amount of collagen in the linea alba of patients undergoing laparotomic bariatric surgery and comparing with non-obese cadavers. Methods: Were evaluated 88 samples of aponeurosis from abdominal linea alba of 44 obese patients (obesity group) and 44 non-obese cadavers (control group). The samples were collected in 2013 and 2104, and were sorted according to age (18-30, 31-45 and 46-60), gender, BMI, waist and cervical circumference, and subcutaneous tissue thickness. Material for biopsy was collected from the supraumbilical region of the linea alba for immunohistochemical analysis differentiating collagen type 1 and type 3 and the 1/3 ratio. Image-Pro Plus pixel counting software was used to measure the amount of collagen. Results: The obesity group evidenced mean age 44.11±9.90 years; 18-30 age group had three (6.8%) obese individuals; 31-45 had 22 (50%) and 46-60 had 19 (43.1%). Females were present in 81.8% (n=36); BMI (kg/m²) was 48.81±6.5; waist circumference (cm) was 136.761±13.55; subcutaneous tissue thickness (cm) 4.873±0.916. Considering age groups, gender and BMI, there were statistical differences in all tests when compared with the cadavers. Conclusion: The amount of collagen in the linea alba above the umbilical region in the morbidly obese patients was smaller than in the non-obese cadavers in the same age group.

scholarly journals Coenzyme q10 is potentially usedto improve lipid profile in diabetic hypercholesterolemia-induced periodontitis in the coastal area

2018 ◽  
Vol 47 ◽  
pp. 07006
Author(s):  
Saryono Saryono ◽  
Hesti Devinta ◽  
Abdul Haris Budi Widodo ◽  
Arif Imam Hidayat
Keyword(s):  
Lipid Profile ◽  
Coenzyme Q10 ◽  
Coastal Area ◽  
Positive Control ◽  
Atherogenic Index ◽  
Control Group ◽  
Treatment Groups ◽  
Significant Difference ◽  
Pap Method ◽  
Post Hoc

Contaminated water often affects the occurrence of periodontitis in the coastal area. The diabetic hypercholesterolemia-induced periodontitis in Indonesia is very high. The use of coenzyme Q10 to treat this disease has never been investigated yet. Therefore, this study aimedto analyze the effect of coenzyme Q10 on the lipid profile of diabetic hypercholesterolemia-induced periodontitis.Twenty four rats were randomized into 6 groups (G1-G6). The groups (G1-G3) are healthy, negative and positive control group respectively. The treatment groups (G4-G6) are diabetic hypercholesterolemia-induced rats given coenzyme q10 dose of 13,5; 27 and 54 mg/kg respectively. Rats were induced by periodontitis, hypercholesterolemia and diabetes mellitus. Coenzyme Q10 was administered orally using 2 mL gastric tube once a day for 14 days. Lipid profile including triglycerides, HDL, and atherogenic index (IA) was measured enzymatically by the CHOD-PAP method. Data were analyzed by one-way ANOVA test and followed by the Least Significant Difference (LSD) post hoc test.Coenzyme Q10 with a dose of 54 mg/kgis effective in lowering triglyceride, and atherogenic index and increasing HDL level in diabetic hyperlipidemia-induced periodontitis rats model. This research supports the potential effects of coenzyme Q10 supplementation to improve lipid profile in diabetic hypercholesterolemia-induced periodontitis in the coastal area.

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