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Article
The Effect of Insertion Rate on The Adaptability of Gutta-Percha and The Apical Extrusion of Thermoplasticized Gutta Percha Obturation Techniques

Author: Samer Aun Thyab Al-Shimari سامر عون ذياب
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 4 Pages: 33-36
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: In the Thermafil as a root canal obturation, system little is known about the effect that varying rates of insertion have on the adaptability of thermoplasticized GP and the amount of apical extrusion.Materials and methods: thirty simulated root canals were obturated with thermafil obturators and Apexit Plus sealer at three different insertion rates. The obturated canals were sectioned at three different levels, the sealer average film thickness for each section was calculated and the amount of apical extrusion for each canal was conducted.Results: the higher adaptability was seen with the faster insertion rate while the slower insertion rate showed fewer tendencies to cause apical extrusion.Conclusions: the intermediate insertion rate had the best results between the other two rates for both adaptability and apical extrusion


Article
The influence of instrument application frequency on the apical extrusion of debris using rotary ProTaper, hand ProTaper and hybrid technique (An in vitro study)

Authors: Majida K. Al-Hashimi ماجدة الهاشمي --- Zaid K. Al-Doory زيد الدوري
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 4 Pages: 34-39
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Various kinds of hand-held or rotary instruments and techniques are used for mechanical preparationof the canal during root canal treatments. These instruments and techniques may push debris out of the canalswhich may induce inflammation within the periapical area; therefore, instrumentation technique that causes lessextrusion of debris is more desirable. The aim of this study was to compare the effect of instrument applicationfrequency on the amount of apically extruded debris.Materials and Methods: One hundred and twenty extracted human teeth were used in this study; all teeth wereshortened to a length of 15 mm. Each experimented root was mounted on a centrifuge tube that forced through aprecut hole in a rubber stopper of a glass vial. The roots were divided randomly into 3 groups, each group contained40 roots. Group R: prepared by rotary ProTaper, Group H: prepared by hand ProTaper, Group S: prepared by Hybridtechnique. Each group was further subdivided in to five subgroups (A, B, C, D, and E). Debris extruded from apicalforamen was collected in a centrifuge tube containing 0.5 milliliter of distilled water. Each empty centrifuge tube wasweighed before preparation by 0.0001g. sensitive weighing machine. Then at the end of canal preparation, thesecentrifuge tubes were completely dried using an incubator at 68 C° for two days and weighed again. The differencebetween the weights of tubes in two stages represented the weight of debris extruded from apical foramen duringinstrumentation.Results: No significant difference recorded for the mean weight of apically extruded debris regarding the instrumentapplication frequency within the same instrumentation technique; but there was a high significant difference for thesubgroups (A, B, C, and D) and a significant difference for subgroup E, regarding the effect of instrumentationtechniques on amount of apical extrusion of debris among tested groups.Conclusion: The hand ProTaper extruded smaller amounts of apical debris than the rotary ProTaper and largeramounts than Hybrid technique


Article
Evaluation of apically extruded debris by using hand and rotary Nickel-Titanium instruments

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Abstract

This study evaluated the amount of apical debris, using hand, rotary ProTaper instruments, and rotary ProFile instruments. Forty five of mandibular premolars with single root were randomly divided into three groups. The teeth in all groups were instrumented until reaching the working length, with ProFile, rotary ProTaper and hand PrpTaper instruments. Debris extruded from the apical foramen was collected into preweighed polyethylene vials and the extruded irrigant was evaporated. The weight of the dry extruded debris was established by comparing the pre-and post instrumentation weight of polyethylene vials for each group. All instruments tested produce a measurable amount of debris, a statistically significant difference was observed between ProTaper instruments and ProFile group in term of debris extrusion (P < 0.001). Although ProTaper rotary extruded a relatively higher amount of debris, no statistically significance difference was observed between this type and the ProTaper hand instruments (P > 0.05).


Article
A comparison of apical sealing and extrusion between Thermafil and Lateral condensation techniques

Author: Dr. Jamal A. Mahdi, B.D.S., M.Sc. (Assistant Prof.) د. جمال عزيز مهدي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2006 Volume: 3 Issue: 3 Pages: 216-223
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

One hundred Thirty two canals from 66 mesial roots of extracted humanmandibular molars were instrumented with Protaper and K-file crown-down techniqueand divided into two groups. The group I was obturated with Thermafil technique andgroup II was obturated with lateral condensation technique. Topseal sealer was usedin both groups. Apical extrusion, apical microleakage, time for instrumentation andtime for obturation were recorded in each sub group. Six molars were used as controlteeth. All specimens were stored in 100% humidity for 1 week, coated with nailpolish, except for the apical 2mm, and were suspended in methylene blue dye for 72h.Linear dye leakage was statistically different (ANOVA) test, while apical extrusionbetween techniques was not statistically different (Chi-square test).


Article
Evaluation of the amount of apically extruded debris using different root canal instrumentation systems

Authors: Dr. Iman M. Al-Zaka, B.D.S., M.Sc د. ايمان محمد الزقة --- Dr. Hashim M. Hussein, B.D.S. د.هاشم حسن
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2014 Volume: 11 Issue: 1 Pages: 1-10
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purpose of this study was to evaluate the amount of apically extruded debrisusing 5 types of nickel–titanium endodontic instruments (Hand ProTaper, RotaryProTaper, Rotary Mtwo, RECIPROC and WaveOne). Seventy-five freshly extractedmandibular premolar teeth were used in this study. All teeth were shortened to alength of 14mm. The specimens were randomly divided into five groups (each groupcontaining 15 samples) according to the type of instrumentation systems used. GroupI: instrumented by hand ProTaper system (Hand technique). Group II: instrumentedby rotary ProTaper system. Group III: instrumented by rotary Mtwo system. Group1V: instrumented by single file RECIPROC system. Group V: instrumented by singlefile WaveOne system. Debris extruded from the apical foramen was collected intopre-weighed glass vials. The difference between the weights of vial (pre-weight andpost-weight) represented the weight of debris extruded from apical foramen duringcanal preparation. The results showed that all groups induced extrusion of debris,Mtwo group (III) has statistically the lowest mean value of apically extruded debris incomparing with all other groups, followed by rotary ProTaper (II), hand ProTaper (I),and WaveOne (V) groups respectively. While the RECIPROC group (IV) hasstatistically highest mean value.

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