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Article
A Microleakage evaluation of Sonicfll, Silorane-based and nanofll methacrylate-based composites (a comparative study)

Authors: Muhanned A. AlHadad --- Hikmet A. Sh. AlGharrawi --- Jacob Y. Al-Hashemi
Journal: Journal of Oral and Dental Research مجلة طب الفم والاسنان ISSN: 23106417 Year: 2017 Volume: 4 Issue: 2 Pages: 120-129
Publisher: Iraqi Association for Oral Research الجمعية العراقية لبحوث طب الفم

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Abstract

Introduction Resin composites have been improved greatly nowadays, and many advancement has been reached. However, polymerization shrinkage is still a challenging drawback of composite resin restorations. Objectives this study was conducted with aim of comparing, in vitro, the marginal adaptation of three different, low shrinkages, direct posterior composites. Materials and Methods The following composites, Sonic fll® (nanohybrid composite), Filtek® P90 (Silorane-based composite) and Filtek® Z350 (nanofll composite) utilizing a standardized Class V cavity preparation followed by thermal cycling. Sixty human premolars prepared with standardized Class V cavities. The specimens were divided into three groups (n=20) according to the material used. All specimens were subjected to thermocycling at (5° to 55°C), then immersed in 2% methylene blue dye for 24hrs. For each group microleakage at the occlusal and gingival regions was measured by determining dye penetration using scoring system under steromicroscope at 100x. Results The statistical analysis of the results showed that, silorane-based composite exhibited the lowest microleakage, with statistical signifcant difference (p< 0.05) when compared with Sonicfll® composite and Filtek® Z350 XT nanofll composite. On the other hand, the results of this study showed non-signifcant difference between Sonic fll® composite and Filtek® Z350 XT. Also, there is a signifcant difference ( < 0.01) in dye penetration between occlusal and gingival regions within each group. Conclusion Taking into consideration the types of composites tested in this study, we recommend the clinical use of Siloran-based composite material for higher microleakage resistance and better marginal seal.


Article
A Comparison between immediate and delayed post space preparation on the apical seal prepared by hand protaper instruments

Author: Dr. Biland Mohammed Salim.* د.بلند محمد سليم
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2008 Volume: 5 Issue: 3 Pages: 232-238
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Forty single-rooted human mandibular premolar were instrumented with hand ProTaper instruments and obturated with gutta-percha and Zinc oxide eugenol sealer. Then all teeth were divided to two group the first group received immediate post space preparation half teeth with hot plugger and other half with peeso reamer, the roots were coated with nail varnish and were immersed in methylene blue 2% for 72 hours in an incubator. After one week the other group received delayed post space preparation same as the first group and coated with nail varnish and were immersed in methylene blue 2% for 72 hours in an incubator. All roots splitted longitudinally and the apical leakage measured and compared for each group. The minimal leakage value and the lowest mean of leakage were observed in subgroup one, while the maximum leakage value and the highest mean of leakage was obvious in subgroup four. A significant difference was found in the group of roots that received delayed post space preparation using peeso reamers, which showed more apical leakage than other subgroups.


Article
Comparison of marginal adaptation between all ceramic crown and full cast crown with two different luting cement (In Vitro study)

Authors: Dr. Salma Issa Alabudi B.D.S., M.Sc. د. سلمى عيسى --- Dr. Jinan Qassim د. جنان قاسم --- Dr. Shimaa Obied د. شيماء عبد
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2016 Volume: 13 Issue: 1 Pages: 19-24
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purpose of this study was to determine and evaluate the micro leakage and fit ofall ceramic crown and full cast metal crown using two different luting agent. Twentyfour recently caries free wisdom teeth were used .The teeth were cleaned and checked with magnifying lens.Noticed any cracks or caries . Specimens remained in distilled water at roomtemperature . Each specimen were centrally inserted in cylinder 20mm height and 20mminternal diameter containing self curing acrylic resin . Preparation were completed at thedentin level of the cement -enamel junction with a chamfer finish line 1.2mm all roundtooth . The height of preparation was 7mm with a convergence angle of six degree usingdiamond bur ( Germany, No 878, 2012) . Prepared teeth were divided in two maingroups ( n=6) .Group A: All ceramic crown(12-Specimens) . Subdivided in two subgroup.A1:- ( 6) Specimens used the zinc-phosphate cement. A2:- (6) Specimens used resincement . Group B :- Full cast crown (12-Specimens). Subdivided in tow subgroupGroup B1 :-( 6 ) Specimens used zinc-phosphate cement Group B2:- (6 ) Specimensused resin cement .After 24hr of storage in distilled water at 37c , all the specimens immersed in 0.5%basic fuchcin dye for 24hr.Fallowing removal from the solution , each tooth wasvertically sectioned bucco-lingually with water-cooled diamond disc . Stereomicroscopeat 40 magnification was to study the extent of microleakge, which was indicated by thedye pentration recorded at both metal-cement(MC) and tooth-cement ( TC) interface .Microleakge was done according to the index proposed by Tjan etel[1] .The data of all 4 groups was analyzed with one-way analysis of variance withstudent T-test was used to compare the microleakage scores within the groups at both theinterface. The data obtained in this study show statistically significant difference inmicroleakage level between group A and B and between subgroup of specimens.The conclusion of this study , resin cement recorded less micro leakage in both allceramic crown, and metal cast crown Than zinc – phosphate cement , because The self curing nature with low curing rate, give rapid and superior adhesion to both dentin andrestoration and better mechanical properties

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