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Article
The effect of smear layer removal on apical seal of teeth obturated with two different obturation techniques
تأثير إزالة طبقة اللطاخة على الختم القمي للأسنان المغطاة بطريقتين مختلفتين للتسرب

Author: Media A. Saeed
Journal: Zanco Journal of Medical Sciences مجلة زانكو للعلوم الطبية ISSN: 19955588/19955596 Year: 2011 Volume: 15 Issue: 3 Pages: 56-63
Publisher: Hawler Medical Univeristy جامعة هولير الطبية

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Abstract

Background and objectives: .The purpose of this study was to evaluate the effect of smear layer removal on apical seal and the quantity of microleakage associated with lateral cold condensation and thermafil obturation.Methods: Forty extracted single–rooted human teeth were randomly divided into two experimental groups; in group A, 20 roots with smear layer free, 5.25 % sodium hypochlorite (NaOCl) and 17% Ethylenediamine tetraacetic acid (EDTA) were used as irrigants to remove the smear layer, while in group B, 20 roots with smear layer, normal saline was used as irrigant. All root canals were instrumented with the Pro-taper rotary system using a crown-down technique. Each group of instrumented roots were subdivided randomly into two obturation groups; in group 1, 10 roots were obturated by thermafil with plastic carrier, while in group 2, 10 roots were obturated by cold lateral compaction technique. Zinc oxide euginol was used as the sealer. The root surfaces were then coated with nail polish except for the apex, then dye penetration study conducted and samples were examined under the stereomicroscope. Data had been collected from two independent examiners and statistically analyzed using student t-test.Results: There was non significant difference between all the groups radiographically while stereomicroscopic analysis showed significant difference of smear layer free group when obturated by thermafil with other groups. Conclusion: Smear layer free group gave the best results when used with lateral condensation technique (LCT) and smear layer group gave the best results when used with thermafil.

Keywords

Smear layer --- Thermafil --- Obturation


Article
Obturation of internally prepared cavities (simulating internal resorption) with three different techniques
امتلاء التجاويف المعدة داخليًا (محاكاة الارتشاف الداخلي) بثلاث تقنيات مختلفة

Authors: Raid F. Salman --- Media A. Saeed
Journal: Zanco Journal of Medical Sciences مجلة زانكو للعلوم الطبية ISSN: 19955588/19955596 Year: 2011 Volume: 15 Issue: 2 Pages: 21-28
Publisher: Hawler Medical Univeristy جامعة هولير الطبية

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Abstract

Background and objectives:There is controversy as to which instrumentation and/or obturation techniques to choose for the treatment of the internal resorption defects. This in vitro study compared the instrumentation and obturation quality of simulated internal resorption cavities (IRC) with 3 different techniques.Methods:Ninety extracted human roots were used and sectioned transversely 5 mm from the apex and hemi-circular cavities were prepared in both sections. The sections were glued back together using superglue and embedded in plaster mold, thus obtaining root canals with cavities simulating internal resorption. The samples were randomly divided into 3 groups of 30 roots and instrumented by pro-taper rotary files, hybrid technique, or step-back technique, then each group subdivided into three subgroups of 10 roots and obturated with cold lateral condensation, warm vertical compaction, or injectable thermo-plasticized technique. After obturation, the samples were radio-graphed in Bucco-lingual and Mesio-distal view. After that, the plaster molds were removed, and the samples were then sectioned at the previous level and the quality of the obturation of the IRC were viewed under stereomicroscope.Results: There was highly significant difference between pro-taper rotary files compared with hybrid and step-back techniques. The results of obturation techniques radiographically and by stereomicroscope showed that there was highly significant difference in between injectable thermo-plasticized compared with other two techniques.Conclusion:The pro-taper rotary files and injectable thermo-plasticized technique gave the best results for treatment of simulated internal resorption cavities (IRC).


Article
The effect of two finishing and polishing systems on the surface roughness of two composite resins
تأثير نظامي التشطيب والتلميع على خشونة السطح لريتين من الراتنجات المركبة

Authors: Razawa K. Saeed --- Intesar S. Toma --- Media A. Saeed
Journal: Zanco Journal of Medical Sciences مجلة زانكو للعلوم الطبية ISSN: 19955588/19955596 Year: 2013 Volume: 17 Issue: 3 Pages: 484-489
Publisher: Hawler Medical Univeristy جامعة هولير الطبية

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Abstract

Background and objective: The purpose of this study was to evaluate the effect of two finishing and polishing systems on the surface roughness of two different types of composite resins.Methods: Fourty samples of 6 mm in diameter and 2 mm in depth were prepared, 2 types of composite resins were used (nanocomposite and hybrid composite resin). Twenty samples of each type of material were prepared and divided into two main groups and then each main group subdivided randomly into two subgroups of 10 samples each. Ten samples of each material were submitted to finishing by finishing disc. While the other 10 samples of each material were submitted to finishing by finishing bur. Both finishing systems were used with a slow-speed hand piece in a dry field and with a light intermittent pressure for about 15 seconds for each disc and bur. After storage of the samples for 48 hours; the analysis of the surface roughness was carried out, three readings were made on each surface using a stylus tip, and the extension of each reading was 2 mm stroke.Results: There was non significant difference between the groups except there was a significant difference between the two finishing systems when used with hybrid composite.Conclusion: Finishing discs gave best results on nano composite and hybrid composite when compared with finishing diamond bur, with highly significant effect on nano composite.


Article
The effect of duration of finishing and polishing on the surface roughness of two composite resins
تأثير مدة التشطيب والتلميع على خشونة السطح لراتينتين مركبتين

Authors: Intesar S. Toma --- Media A. Saeed --- Razawa K. Saeed
Journal: Zanco Journal of Medical Sciences مجلة زانكو للعلوم الطبية ISSN: 19955588/19955596 Year: 2013 Volume: 17 Issue: 2 Pages: 405-410
Publisher: Hawler Medical Univeristy جامعة هولير الطبية

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Abstract

Background and objective: The purpose of this study was to evaluate the effect of duration of finishing and polishing procedures on the surface roughness of two different types of composite resins.Methods: Forty samples of 6 mm in diameter and 2 mm in depth were prepared, 2 types of composite resins were used (nanocomposite and hybrid composite resin). Twenty samples of each type of material were prepared and divided into two main groups and then each main group subdivided randomly into two subgroups of 10 samples for each subgroup (one). Ten samples of each material were submitted to finishing by using a finishing kit. The available finishing kits used in this study containing discs, cups and points that were used with a slow-speed hand piece in a dry field and with a light intermittent pressure for about 15 seconds. While the other 10 samples of each material were finished for about 30 second; then the analysis of the surface roughness was carried out, three readings were made on each surface using a stylus tip and the extension of each reading was 2 mm stroke.Results: There was non significant difference between the groups that were finished and polished for 15 second and the other groups that were finished and polished for 30 second for the two different types of composite resin.Conclusion: Increasing duration of finishing and polishing has no effect on the surface roughness of The two different types of composite resin.


Article
Coronal sealing ability of different sealers on teeth obturation and the effectiveness of two different obturation techniques
قدرة السد الإكليلي لسدادات مختلفة على تسريب الأسنان وفعالية تقنيتين مختلفتين لسد الأسنان

Authors: Dara H. Saeed --- Intesar S. Toma --- Media A. Saeed
Journal: Zanco Journal of Medical Sciences مجلة زانكو للعلوم الطبية ISSN: 19955588/19955596 Year: 2012 Volume: 16 Issue: 3 Pages: 180-186
Publisher: Hawler Medical Univeristy جامعة هولير الطبية

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Abstract

Background and objectives: The purpose of this study was to evaluate the effect of two sealers on coronal seal and the coronal sealing ability of two obturation techniques. Methods: Forty extracted single–rooted human teeth were instrumented with the step-back technique and were irrigated with 5.25% sodium hypochlorite (NaOCl). The smear layer was removed by washing with 10 ml of 17% ethylene diamine tetra-acetic acid (EDTA) and 10 ml of 5.25% (NaOCl). All instrumented root canals were randomly divided into two experimental groups; Group A: 20 roots epoxy resin sealer (AH26) was used, Group B: 20 roots Zinc oxide euginol (ZOE) sealer was used. Each group of main groups were subdivided randomly into two obturation groups; 1. 10 roots obturated by thermo plasticized technique (obtura II), 2. 10 roots obturated by cold lateral compaction technique. The root surfaces were then coated with nail polish except for the coronal, then dye penetration study was conducted and samples were examined under the stereomicroscope. Data had been collected from three independent examiners and statistically analyzed using student t-test. Results: There were significant differences between AH26 with ZOE in group obturated by obtura II and when obtura II technique compared with the cold lateral compaction technique in group of AH26 sealer. Conclusion: Epoxy resin sealer (AH26) and obtura II gave the best results in coronal sealing when compared with Zinc oxide euginol sealer and cold lateral compaction technique.

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