Proximal Contact Repair of Complex Amalgam Restorations

2017 ◽  
Vol 42 (3) ◽  
pp. 266-272
Author(s):  
MN Zguri ◽  
JA Casey ◽  
JP Jessup ◽  
KS Vandewalle
Keyword(s):  
Testing Machine ◽  
Tooth Surface ◽  
Control Group ◽  
Amalgam Restoration ◽  
Group Data ◽  
Significant Difference ◽  
Line Angle ◽  
The Mean ◽  
Amalgam Restorations ◽  
Repair Group

SUMMARY The carving of a complex amalgam restoration may occasionally result in light proximal contact with the adjacent tooth. The purpose of this study was to investigate the strength of complex amalgam restorations repaired with a proximal slot amalgam preparation. Extracted human third molars of similar coronal size were sectioned 1 mm apical to the height of the contour using a saw and were randomly distributed into 9 groups of 10 teeth each. One pin was placed at each line angle of the flattened dentinal tooth surface. A metal matrix band was placed and an admixed alloy was condensed and carved to create a full crown contour but with a flat occlusal surface. A proximal slot was prepared with or without a retention groove and repaired using a single-composition spherical amalgam 15 minutes, 24 hours, one week, or six months after the initial crown condensation. The specimens were stored for 24 hours in 37°C water before fracture at the marginal ridge using a round-ended blade in a universal testing machine. The control group was not repaired. The mean maximum force in newtons and standard deviation were determined per group. Data were analyzed with a 2-way analysis of variance as well as Tukey and Dunnett tests (α=0.05). Significant differences were found between groups based on type of slot preparation (p=0.017) but not on time (p=0.327), with no significant interaction (p=0.152). No significant difference in the strength of the marginal ridge was found between any repair group and the unrepaired control group (p>0.076). The proximal repair strength of a complex amalgam restoration was not significantly different from an unrepaired amalgam crown. Placing a retention groove in the proximal slot preparation resulted in significantly greater fracture strength than a slot with no retention grooves. Time of repair had no significant effect on the strength of the repair.

scholarly journals Procalcitonin Levels in Patients with Complete and Incomplete Kawasaki Disease

2013 ◽  
Vol 35 ◽  
pp. 505-511 ◽  
Author(s):  
Hwa Jin Cho ◽  
Young Earl Choi ◽  
Eun Song Song ◽  
Young Kuk Cho ◽  
Jae Sook Ma
Keyword(s):  
Kawasaki Disease ◽  
Acute Stage ◽  
Control Group ◽  
Incomplete Kawasaki Disease ◽  
Procalcitonin Level ◽  
Subsequent Time ◽  
Group Data ◽  
Significant Difference ◽  
Complete Form ◽  
The Mean

Incomplete Kawasaki disease (iKD) is considered to be a less complete form of Kawasaki disease (cKD), and several differences in the laboratory presentations of iKD and cKD have been noted. We investigated serum procalcitonin levels in patients with iKD, cKD, and other febrile diseases (a control group). Seventy-seven patients with cKD, 24 with iKD, and 41 controls admitted to our hospital from November 2009 to November 2011 were enrolled in the present study. We obtained four measurements of serum procalcitonin levels and those of other inflammatory markers from each patient. Samples were taken for analysis on the day of diagnosis (thus before treatment commenced; D0) and 2 (D2), 14 (D14), and 56 days (D56) after intravenous immunoglobulin infusion. We obtained control group data at D0. The mean D0 serum procalcitonin levels of cKD patients (0.71±1.36 ng/mL) and controls (0.67±1.06 ng/mL) were significantly higher than those of iKD patients (0.26±0.26 ng/mL) (P=0.014andP=0.041, resp.). No significant difference in mean procalcitonin level was evident among groups at any subsequent time. In conclusion, the serum procalcitonin level of patients with acute-stage cKD was significantly higher than that of iKD patients.

scholarly journals IMPROVING STUDENTS COMPETENCE IN WRITING SPOOF TEXT THROUGH GROUP DISCUSSION : A CASE OF THE ELEVENTH GRADE STUDENTS OF SMAN 01 GRINGSING

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Eka Puspawati
Keyword(s):  
Group Discussion ◽  
Modern Method ◽  
Control Group ◽  
Writing Ability ◽  
Group Data ◽  
Significant Difference ◽  
Post Test ◽  
The Mean ◽  
Written Test ◽  
And Control

Group Discussion is a modern method of assessing students personality. The objectives of the study are (1) to find out the students’ writing ability through group discussion and without group discussion, (2) to know if there is any significant difference of the students’ writing ability between using group discussion and without group discussion technique. The type of this research was experimental research. The sample were selected two classes by using cluster random sampling. Each class consisted of 30 students as experimental group and control group. Data were collected by using test and treatment. The instrument of this research was written test. The mean of post-test in control group is 71.83 and the mean of post-test in experiment group is 74.00. Then the t-test score obtained is 5.565 with degree of freedom (df) is 58. From the result of significant t- value is higher than t-table (5.565 > 1.671), it can be concluded that Ho (negative hyphothesis) is rejected. It means that Ha (positive hyphothesis) can be accepted. The conclusion is that using group discussion to teach writing spoof text for the students has significant effect for the improvement of students’ ability in writing spoof text.

scholarly journals Effect of chitosan nanoparticles on microtensile bond strength of resin composite to dentin: an in vitro study

2020 ◽  
Vol 23 (2) ◽  
Author(s):  
Amr Mohsen Mohamed ◽  
Sameh Mahoud Nabih ◽  
Mohamed Ahmed Wakwak
Keyword(s):  
Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Chitosan Nanoparticles ◽  
Tooth Surface ◽  
Control Group ◽  
Microtensile Bond Strength ◽  
Significant Difference ◽  
Self Etch

Objective: The purpose of this study was to evaluate the effect of chitosan nanoparticles on microtensile bond strength of resin composite to dentin using self etch adhesive after aging. Material and Methods: A total number of 90 freshly extracted, sound human molar teeth. Flat tooth surface was gained after cut of the occlusal surface. Three main groups according to pretreatment of dentin before adhesive application; 0.2 % chitosan, 2.5 % chitosan and no treatment control group. Universal self etch adhesive were applied according to manufacture instruction and 4 mm of Feltik Z250 xt composite. Storage of specimens for 1 day, 3 months and 6 months in 37O C distilled water. After that, the tooth was sectioned to beams of 1 mm x8 mm sticks for microtensile bond strength test using universal testing machine. Scanning electron microscope (SEM) was used to evalute the effect of chitosan nanoparticles on dentin and smear layer. Kruskal-Wallis test was used to compare between the three groups as well as the three aging periods. Dunn’s test was used for pair-wise comparisons. The significance level was set at P ≤ 0.05. Results: chitosan 0.2% is statistically significant increase in bond strength than chitosan 2.5% and control in one day group. Three months chitosan 0.2 % groups have statistically significant increase in bond strength than chitosan 2.5%. It was found in 6 months that control and chitosan 0.2 % have statistically significant increase in bond strength than chitosan 2.5%. There was statistically significant difference found between the three studied groups regarding bond strength at different storage times . Conclusion: Microtensile bond strength was influenced by different chitosan concentration. Different aging periods had no effect on the microtensile bond strength without application of chitosan and with application of 2.5% chitosan concentration.KEYWORDSChitosan nanoparticles; Microtensile bond strength; MMPs.

scholarly journals Vision-Related Quality of Life in Patients Suffering from Coexisting Glaucoma and Cataract

2021 ◽  
Author(s):  
Masoud Khorrami-Nejad ◽  
farshid karimi ◽  
Azimi Abbas ◽  
Daneshvar Ramin ◽  
Seyed Aliasghar Mosavi ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Cataract Surgery ◽  
Control Group ◽  
Healthy Individuals ◽  
Cross Sectional ◽  
Group Data ◽  
Significant Difference ◽  
Related Quality ◽  
Post Operation ◽  
The Mean

Abstract PurposeTo evaluate the QOL and vision-related QOL in patients suffering from coexisting glaucoma and cataract.MethodsThis cross-sectional-analytical study was carried out on 222 cases including 163 patients suffering from coexisting glaucoma and cataract as patients’ group and 59 healthy individuals as the control group. Data were gathered via the use of EuroQol five-dimensional (EQ-5D) and National Eye Institute-Visual Functioning Questionnaire 39 (NEI-VFQ 39(. Then, the obtained results were compared before and one month after cataract surgery in patients and control groups. ResultsThe mean and 95% confidence interval of overall vision-related QOL score in healthy individuals and patients during pre- and post-operation phases were 86.65 (69.3 – 104.0), 48.7 (9.4 – 88.1) and 56.1 (12.2 – 100.0), respectively. There were significant differences among the three compared groups in terms of all NEI-VFQ 39 items (P<0.05). The mean and confidence interval of EQ-5D score during pre- and post-operation phases were 0.42 (0.21-0.64) and 0.58 (0.39-0.78), respectively (P=0.017) and for healthy individuals, it was 0.70(0.59-0.80). After surgery, all QOL items significantly increased among patients (P<0.05). Also, there were significant differences in the scores compared to healthy individuals (P<0.05). One month after surgery, all vision-related QOL items` scores obtained by NEI-VFQ 39 and all QOL items` scores obtained by EQ-5D were significantly lower in the treated patients than healthy individuals (P<0.05).Conclusion In patients suffering from coexisting glaucoma and cataract, the overall QOL and vision-related QOL scores were improved after cataract surgery. However, there was a significant difference between them and healthy individuals.

The Palmar Locking Compression Plate is Biomechanically Comparable to the Dorsal PI Plate for Dorsally Comminuted, Intraarticular Wrist Fractures

2007 ◽  
Vol 32 (4) ◽  
pp. 388-393 ◽  
Author(s):  
A. J. HART ◽  
T. SEEPAUL ◽  
R. J. HEWITT ◽  
S. ANG ◽  
U. HANSEN ◽  
...  
Keyword(s):  
Permanent Deformation ◽  
Testing Machine ◽  
Absolute Difference ◽  
Control Group ◽  
Materials Testing ◽  
Wrist Fractures ◽  
Significant Difference ◽  
The Mean ◽  
Clinically Significant ◽  
Experimental Group

A clinically appropriate fracture model and testing regimen were used to test the null hypothesis that a palmarly applied locking plate was inferior to a dorsally applied Pi plate in the stabilisation of dorsally comminuted intraarticular wrist fractures. Sixteen standardised fractures of Synbone models of the radius were stabilised using either a palmar locking compression T plate (the experimental group) ( n = 8) or a dorsally applied Pi plate (the control group) ( n = 8). The constructs were tested on an Instron materials testing machine. Deformation was monitored during 500 loading cycles to 200 N. The mean permanent deformation and stiffness favoured the palmar locking compression T plate over the dorsal Pi plate ( P = 0.036). However, the absolute difference was only 0.5 mm. Such a small difference is unlikely to be clinically detectable and, therefore, we conclude that there is no clinically significant difference between the two types of fixation.

scholarly journals Evaluation of shear bond strength of orthodontic brackets bonded on the tooth surface after internal bleaching

2014 ◽  
Vol 43 (3) ◽  
pp. 209-213
Author(s):  
Nadia de Souza FERREIRA ◽  
Patrícia Campos Ferreira da ROSA ◽  
Raffaela Di Iorio Jeronymo FERREIRA ◽  
Marcia Carneiro VALERA
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Tooth Bleaching ◽  
Tooth Surface ◽  
Control Group ◽  
Sodium Perborate ◽  
Safe Procedure ◽  
Carbamide Peroxide ◽  
Significant Difference

Introduction: There is great demand for esthetic treatment by patients who have discolored teeth, because currently aesthetic standards have become stricter and many patients have tooth bleaching procedures performed before or during orthodontic treatment. Objective: To evaluate the bonding of orthodontic brackets to human molars after internal tooth bleaching. Material and method: Forty molars were divided into four groups according to the bleaching agent used: PS) sodium perborate + water; PC) carbamide peroxide; PC + PS) carbamide peroxide + sodium perborate; Cont) water (control group). Bleaching agents placed inside the pulp chambers were replaced every 7 days for 2 weeks, and the brackets were bonded 30 days after the end of bleaching. The shear strength test was performed in a universal testing machine (Emic). Result: ANOVA with a significance level of 5% (p > 0.05), showed no statistically significant difference between groups (p = 0.1214). Conclusion: It was concluded that the different bleaching agents studied did not interfere with the bond strength of brackets to enamel and bonding the brackets 30 days after internal bleaching is a safe procedure.

scholarly journals Effect of Different Cleansing Protocols on Bond Strength of Composite Resin to Dentin Contaminated with Hemostatic Agent: An In Vitro Study

2020 ◽  
Author(s):  
Keivan Saati ◽  
Seyedeh Farnaz Tabatabaei ◽  
Delaram Etemadian ◽  
Morad Sadaghiani
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Hemostatic Agent ◽  
Tooth Surface ◽  
Control Group ◽  
Significance Level ◽  
Tooth Structure ◽  
Etch And Rinse ◽  
Significant Difference

Objectives: Inadequate removal of the hemostatic agent can adversely affect the bond strength of restorations to the tooth structure. This study aimed to assess the effect of different cleansing protocols on the shear bond strength (SBS) of an etch-and-rinse adhesive to dentin contaminated with aluminum chloride hemostatic agent. Materials and Methods: In this experimental study, the mid-coronal dentin of 96 premolars was exposed. They were contaminated with a hemostatic agent (ViscoStat Clear) and then randomly divided into 7 groups (n=12). One group served as the control. The groups underwent various cleaning methods as follows: water spray, aluminum oxide particles (27µ diameter), a slurry of pumice with water, GC dentin conditioner (GCDC), sodium hypochlorite 2% (SHC), and chlorhexidine 2% (CHX). Composite cylinders were then fabricated and bonded to the surfaces using Scotchbond Multi-Purpose etch-and-rinse bonding agent. After thermocycling (10,000 cycles), the SBS was measured using a universal testing machine. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey HSD (honestly significant difference) test, and the significance level was set at 0.05. Results: The SBS of the groups was significantly different (P=0.036). The SBS was the highest in the CHX and SHC groups, and the lowest SBS was related to the control group and GCDC groups. The difference between other groups was not significant (P=0.996). Conclusion: CHX and SHC yielded the highest bond strength among the tested modalities for cleansing the ViscoStat Clear from the tooth surface.

scholarly journals Comparison of Enamel Preparations - Bevel, Chamfer and Stair Step Chamfer on Fracture Resistance of Nano Filled Resin Composites Using Bulk Pack Technique - An In Vitro Study

2019 ◽  
Vol 7 (23) ◽  
pp. 4089-4093
Author(s):  
Jyothi Bommanagoudar ◽  
Shashidhar Chandrashekhar ◽  
Shilpa Sharma ◽  
Hiten Jain
Keyword(s):  
Fracture Resistance ◽  
Failure Load ◽  
Testing Machine ◽  
In Vitro Study ◽  
Control Group ◽  
Tooth Structure ◽  
Group I ◽  
Significant Difference ◽  
The Mean

AIM: To evaluate and compare the effect of enamel preparation designs bevel, chamfer and stair-step chamfer on the fracture resistance of nanocomposite. METHODS: The sample group of this study consisted of 72 non-carious permanent maxillary central incisors. The sample is divided into four groups of 18 each. Group, I control Group II bevel preparation, Group III chamfer preparation, group IV stair step chamfer preparation. After the specific preparation, each tooth is filled with nanocomposite using bulk pack technique. The teeth were subjected to fracture resistance test under Universal testing machine and then were examined under a stereomicroscope to evaluate the type of bond failure. The results were subjected to statistical analysis. RESULTS: Results of the One-Way ANOVA revealed a significant difference in the mean peak failure load values of the four different groups. (P < 0.001) Tukey’s Post-Hoc comparison test revealed that there was a significant difference in the mean peak failure load values of the bevel and chamfer preparation. But there was no significant difference between chamfer and stair-step chamfer preparation designs. CONCLUSION: Stair-step chamfer preparation demonstrated comparable values to Chamfer preparation but also involved the removal of less amount of tooth structure adjacent to the fractured edge and good esthetic technique.

Determination some Immunological Aspects in Pulmonary Tuberculosis Patients in Qadisiyah Province

2018 ◽  
Vol 9 (2) ◽  
Author(s):  
Syoof Khowman Alramahy ◽  
Akram Hadi Hamza
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Pulmonary Tuberculosis ◽  
Statistical Difference ◽  
Positive Culture ◽  
Control Group ◽  
Tuberculosis Patients ◽  
Significant Difference ◽  
Lowenstein Jensen ◽  
The Mean ◽  
Igg Level

This study was carried out to study of some immunological aspects among the pulmonary Tuberculosis patients infected with causative agent, Mycobacterium tuberculosis. A Total of 200 sputum samples were collected from patients attending the consultant Clinic for Chest and Respiratory disease center, Diwaniya. Control group (No=15) also included. According to acid fast stain of sputum, the patients were classified as positive (No=91,45.5%) and negative (No=109,54.5, Lowenstein Jensen medium used for the cultivation of samples, on which 70% of sputum samples where positive culture for this microorganism. The grown microorganism were identified as M. tuberculosis, based on positive A.F.B, Niacin producers ,negative for catlase at 68c. The mean IgG level was l184.053±76.684 mg/100 ml in tuberculosis group compared with 1016.533 ± 44.882 mg/100ml in control group, rendering the statistical difference significant. For IgA and IgM levels, they were at mean of 315.880±38.552 mg/100 ml and 119.527±8.464 mg/100 ml in control group compared with 396.358±38.776 mg/100 ml and 134.207±11.696 mg/100 ml in patients group respectively with significant difference

The Effect of Reflexology on Labor Pain and Length Among Primiparous Women: A Randomized Controlled Trial

2018 ◽  
Vol 7 ◽  
Author(s):  
Azita Kamjoo
Keyword(s):  
Controlled Trial ◽  
Intervention Group ◽  
Active Phase ◽  
Labor Pain ◽  
Control Group ◽  
Singleton Pregnancy ◽  
Group Data ◽  
Significant Difference ◽  
Labor Length ◽  
Primiparous Women

Background: Pain control is considered as the key issue in modern midwifery. Along with medical painkillers, reflexology is viewed as a non-medical and noninvasive method. Hence, we aimed to investigate the effect of reflexology on the intensity of pain and length of labor. Materials and Methods: In this clinical trial, participants included 240 Iranian primiparous women with term and singleton pregnancy. Having a 3-4 cm cervical dilatation once they visited the hospital. Through a convenient sampling method, they were selected and then randomly divided into two groups. In the intervention group, reflexology was performed, and the intensity of pain during the active phase of labor along with the length of labor in the active phase was measured by visual analog scale (VAS) and compared with the control group. Data were analyzed using descriptive statistics, t-test, and Mann-Whitney U-test. Result: Data analysis showed a statistically significant difference between the intensity of pain in the 5-7 and 8-10 cm dilatation in the two groups (P=0.01). Moreover, the labor length in the active phase was found to be significantly shorter in the intervention group (P<0.001). Conclusion: It appears that reflexology can lead to a reduction in the pain and length of labor. Therefore, through instructing this technique, a goal of midwifery, which is reducing labor pain and its length can be achieved. Keywords: Reflexology, Labor Pain, Labor Length, Primiparous Women

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