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Article
Evaluation of the push-out bond strength of root canal obturation materials filled by four different obturation techniques

Authors: Saif N, --- Nawal A. Al Sabawi نوال السبعاوي --- Maha M. Yahya مها يحيى
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 2 Pages: 37-43
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of this study was to comparatively evaluate the push out bond strength (PBS) of root canalfillings using four different obturation techniques (single cone (SC), cold lateral compaction (CLC), continuous wave(CW), and carrier based gutta percha (CBG)).Materials and Methods: Forty mandibular premolar decoronated and instrumented with rotary ProTaper to F3 thenteeth were divided randomly into 4 groups of 10 teeth for each as follow: group (I) single- cone obturation withmatched-taper gutta-percha, group (II) cold lateral compaction technique, group (III) continuous wave ofobturation technique, and group( IV) carrier based gutta-percha technique. Zinc oxide eugenol (ZOE) sealer wasused as a root canal sealer for the four groups. After obturation of the root canals, all the roots were sectionedhorizontally at three levels in the apical, middle, and cervical thirds of each group. PBS test was performed usingdigital universal testing machine. Mode of failures was evaluated using digital stereomicroscope (40 X). Collecteddata were analyzed statistically using one way ANOVA and Tukey test.Results: PBS of CW and CBG significantly higher than SC and CLC, but significantly there were no differencesbetween CW and CBG, and between SC and CLC.Conclusion: Under the condition of this study it can be concluded that thermoplasticized techniques obtain superiorPBS of the filling materials in comparisons with cold gutta percha obturation techniques


Article
Micro CT analysis of amount of dentin removal created by SAF vs. ProTaper systems

Authors: Diyar K. Bakir --- Hussain F. Al-Huwaizi حسين فيصل الحويزي --- Raid F. Salman
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 3 Pages: 9-12
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Dentin removed during root canal system instrumentation for creating adequate geometry for thecanal and cleaning the canal. A new instrument had been marketed with the aim of optimum shaping of all parts ofthe canal system, however, no information present about the amount of dentin removal compared to conventionalrotary system. This study investigated the amount of dentin removal when the canal instrumented by SAF comparedwith ProTaper by using high resolution computed tomography (micro CT).Materials and Methods: Twenty extracted single canalled teeth were utilized for this study; and randomly divided into2 groups. In the first group, the root canals were prepared by using protaper rotary system till F2 and the root canalirrigated with 1ml of normal saline after each instrument. The root canals in the second group were prepared usingSAF for 2min, with continuous irrigation (normal saline). After rescanning, the amount of dentin removal wascalculated.Result: It was clear that the use of SAF system had increase the amount of dentin removal and in quantity larger thanthat did by ProTaper system & the mean of net difference was (0.288mm ± 0.051). By using t-independent test, therewas highly significant difference between the two groups at (p=0.001), with in favor of the SAF system over ProTapersystem at p< 0.01; in dentin removal quantityConclusion: Root canal preparation with SAF-system resulted in more and effectively removed dentin whencompared with protaper rotary files


Article
Fracture Resistance of Roots After Canal Preparation by Two Methods and Obturated by Different Techniques ISSN

Author: Wiaam M.O. AL-Ashou
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 29 Pages: 212-219
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The purposes of this in vitro study are to investigate the effect of instrumentation types ( hand and rotary instrumentations) and obturation techniques (Cold lateral, and Thermafil) on vertical root fracture. Materials and Methods: The crown of the 100 single rooted teeth were removed leaving 12mm of the roots length, then the root randomly divided into four groups. Control –ve Group(n=10), Hand Group(n=30), ProTaper Group(n=30) and Helix Group(n=30) according to the type of the instrument used to prepared the root canals. After that, the last three groups subdivided into subgroups according to the obturation technique either by using Cold Lateral condensation technique or Thermafil obturation technique. After the sealer set, the roots were embedded in acrylic moulds and subjected to compressive loading, the load at which the fracture occurred was recorded and statically analysis. Results: the fracture resistance of the root prepared by Helix and ProTaper files were significantly greater than that obtained for the root canals prepared with hand K-files. The results of this study also demonstrated that when root canals obturated with Thermafil the roots resist the fracture load greater than that of the canals obturated with Cold Lateral condensation obturation but the difference is not statistically significant between them. Conclusions: the use of rotary nickel titanium files in endodontic treatment provides higher fracture resistance for the roots, and the use of the Cold Lateral condensation obturation technique may weaken the roots, so that the roots become more susceptible to the vertical root fracture.

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