research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
Comparative Evaluation of the Effect of Different Universal Adhesives and Bonding Techniques on the Marginal Gap of Class I Composite Restoration (A SEM Study)

Authors: Ali F. Al-Qrimli علي القرملي --- Abdulla M.W. Al-Shamma عبد الله محمد وجيه الشماع
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 34-42
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: With the increase in composite material use in posterior teeth, the concerns about the polymerization shrinkage has increased with the concerns about the formation of marginal gaps in the oral cavity environment. New generation of adhesives called universal adhesive have been introduced to the market in order to reduce the technique sensitive bonding procedures to give the advantage of using the bonding system in any etching protocol without compromising the bonding strength. The aim of the study was to study marginal adaptation of two universal adhesives (Single bond™ Universal and Prime and Bond elect) using 3 etching techniques under thermal cycling aging.Materials and Methods: Forty-eight sound maxillary first premolar teeth were included in the study. Teeth were divided into two groups according to the universal adhesive used then each group was subdivided into 3 subgroups according to the etching protocol used. Standardized class I cavities were prepared in the teeth followed by the restoration of teeth using Filtek™ Bulk Fill Posterior Restorative composite material. After finishing and polishing, teeth were subjected to 500 thermal cycles in 55º-5ºC bath with dwell time of 30 seconds. Teeth then were examined using SEM to measure the marginal gap at 12 points. Data obtained were analyzed using one-way ANOVA and LSD test for each group and with student t-test to compare the two adhesives.Results: The result of this study the showed that etch and rinse technique showed significantly the least marginal gap width for both adhesive types. The selective etch technique showed lower gaps compared to the self-etch technique with no significant difference. The result showed that single bond universal showed significantly the least marginal gap for the all etching techniques compared to Prime and bond elect.Conclusion: The etch and rinse technique remains the most suitable technique for adhesive restoration. The type of adhesive plays an important role in adhesion


Article
Effect of gamma irradiation on the bulk –etch rates of lexan polycarbonate solid state nuclear track detector.
تأثير اشعة كاما على معدل القشط لسطح كاشف الاثر النووي للحالة الصلبة

Author: Liqaa A. Ameer Hameed
Journal: journal of the college of basic education مجلة كلية التربية الاساسية ISSN: 18157467(print) 27068536(online) Year: 2012 Volume: 18 Issue: 76 / ملحق Pages: 165-172
Publisher: Al-Mustansyriah University الجامعة المستنصرية

Loading...
Loading...
Abstract

In the present work, we have determined the bulk-etch rates of lexan polycarbonate (C16H14O3)n nuclear track detector at different temperatures to deduce its activation energy, the effects of gamma irradiation on this detector in the dose range of 23 – 71.3 kGy have been studied by using the etching technique. The bulks etch rates increase and the activation energies for bulk etching decrease with the increase in gamma dose. These results have been explained on the basis of chain scission of the detector due to gamma irradiation.

في هذا البحث تم حساب معدل القشط لسطح كاشف الاثر النووي للحاله الصلبة Lexan Polycarbonate الصيغة الكيميائية (C16H14O3)n عند درجات حرارة مختلفة لاستخراج طاقة التنشيط لمعدلات القشط لسطح الكاشف،وكما تم دراسة تأثير جرع مختلفة من اشعة كاما (23-71.3 KGy) على معدلات القشط لسطح الكاشف من خلال استخدام تقنية القشط بمحلول قاشط . حيث وجد ان معدل القشط لسطح الكاشف تزداد وطاقة التنشيط تقل بزيادة جرعة اشعة كاما ويعود السبب في ذلك الى ان اشعة كاما تعمل على شق سلاسل البوليمرية لمادة الكاشف

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

Arabic (1)

English (1)


Year
From To Submit

2016 (1)

2012 (1)