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Article
An Evaluation of Gutta-Percha Penetration Depth into Simulated Lateral Canals by Using Three Different Obturation Techniques (A Comparative Study)

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Abstract

Background:sThe aims of this study were to evaluate and compare the ability of three different techniques toobdurate simulated lateral canals, evaluate the effect of the main canal curvature on obturation of lateral canalsand compare the gutta-percha penetration between coronal and apical lateral canals.Materials and methods: Resin blocks with 30 straight and 30 curved were used in this study. Each canal has twoparallel lateral canals. The main canal has 0.3 mm apical diameter and 0.04 taper. The canals were divided into sixgroups according to canal curvature and obturation techniques used (n=10): Groups C1 and C2: straight andcurved canals obturated with continuous wave technique using E&Q masterTM system. Groups O1 and O2: straightand curved canals obturated with Obtura II. Groups T1 and T2: straight and curved canals obturated with Thermafilobturators. Soapy water was used to simulate sealer in all obturations performed. The depth of gutta-perchapenetration into lateral canals was measured using computerized stereomicroscope.Results: There were very highly significant differences between the obturation techniques at each lateral canal levelin both straight and curved canals. Continuous wave using E&Q masterTM system exhibited the greatest guttaperchapenetration into lateral canals with very highly significant difference from both other techniques at majorityof lateral canals. There was non- significant difference between Thermafil and Obtura II except at coronal lateralcanal of straight main canals where the difference was very highly significant.The gutta-percha depth was greater in coronal than apical lateral canals in all groups of both straight and curvedcanals, and gutta-percha depth was greater in straight than in curved canals within each obturation technique.Conclusion: This study showed that all the three obturation techniques used were able to obturate simulated lateralcanals with the continuous wave technique being the best. Gutta-percha depth was less in the apical than thecoronal lateral canals. Canal curvature can influence the gutta-percha depth


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
In vitro evaluation of sealing ability of matched-taper single cone obturation with an electrochemical method.

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Abstract

Abstractwidespread use of rotary Nickel-Titanium systems has caused manufacturers toproduce gutta-percha cones that match the taper of the canals prepared with thesesystems. The aim of this study was to use electrochemical method to compare theapical sealing ability of taper single-cone, Thermafil obturation in canals preparedwith ProTaper and ProFile instruments. Forty extracted human mandibular premolarwere divided into 2 groups. All canals in group (A) prepared with ProFile, while allcanals in group (B) prepared with ProTaper. Each group subdivided into twosubgroup according to the method of obturation, (Thermafil and matched taper- singlecone).The apical leakage in these groups was evaluated using an electrochemicalmethod. T-test showed a non significant difference between Thermafil and matchedtaper-single cone obturation technique in the same group. A significant difference wasfound between ProTaper and ProFile group in both obturation techniques.


Article
Comparison of apical seal of four obturation techniques after delayed post space preparation

Authors: Ali H. Al-Shimmary علي الشمري --- Hussain F. Al-Huwaizi, حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: special issue 2 Pages: 1-4
Publisher: Baghdad University جامعة بغداد

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Abstract

Backgroound: This in vitro study was conducted to compare the apical seal of four obturation techniques afterdelayed post space preparation.Materials and methods: Sixty simulated straight canals in clear resin blocks were used. The samples which had thesame length, size of apical preparation and taper, were divided into four groups obturated with lateralcondensation, warm vertical compaction, Thermafil, and Softcore obturators. Apexit was used as root canal sealer.Delayed post space preparation was carried out by peeso reamers after one week leaving 6 mm of gutta-perchaapically. The coronal cavity was sealed and the samples immersed in 2 % methylene blue dye for 7 days after whichthe samples were examined by stereomicroscope and calibrated grid to measure apical dye leakage in mm.Results: Vertical compaction leaked significantly less than lateral condensation and Softcore, and Thermafil leakedsignificantly less than Softcore. Both Thermafil and Softcore were comparable to lateral condensation; there was nosignificant difference between vertical compaction and Thermafil.Conclusion: Thermafil and Softcore had no effect on the apical seal when delayed post preparation was consideredand that the apical seal obtained by Thermafil and Softcore was comparable to lateral condensation technique


Article
Push Out Bond Strength of GuttaFlow 2, Thermafil and Guttacore (An Invitro Study)

Authors: HaidarT.F. Elmuttalibi --- Jamal Aziz Mahdi
Journal: Journal of Oral and Dental Research مجلة طب الفم والاسنان ISSN: 23106417 Year: 2019 Volume: 6 Issue: 1 Pages: 7-16
Publisher: Iraqi Association for Oral Research الجمعية العراقية لبحوث طب الفم

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Abstract

Background Several root canal filling materials and techniques have been developed and studied, aiming to completely fill the root canals, their ramifications, and any anatomical variations, which are frequently observed. The objective is to investigate the push out bond strength of three different obturation materials GuttaFlow 2, Thermafil and GuttaCore at different levels. Materials and methods thirty extracted upper molars were collected and the palatal roots were sectioned at the CEJ of the tooth. The platal roots were instrumented with Hyflex CM rotary files to the size of 40/0.06. The instrumented samples were divided into three groups of ten samples each, the first group was obturated with GuttaFlow 2, the second group was obturated with Thermafil and the third group was obturated with GuttaCore obturating materials. After an incubation period of 7 days, each sample were sectioned into three sections of 2 mm thickness (apical, middle, coronal), each slice then introduced to the push out testing using a universal testing machine at a cross head speed of 0.5 mm/min.Results it showed Push-out bond strengths were significantly higher when canals were filled with GuttaCore than those filled with Thermafil and GuttaFlow 2. And Thermafil showed a higher significant difference than the GuttaFlow 2. It also showed that the bond strength values decreased from the coronal to the apical direction. Conclusion The thermoplasticized gutta-percha appears to achieve higher push out bond strength values than the cold flowable gutta-percha. With GuttaCore showed higher push out bond values than Thermafil.


Article
An evaluation of the sealing ability of different obturationand gutta-percha removal techniques (A ComparativeStudy)

Authors: Adel F. Ibraheem عادل فرحان ابراهيم --- Ala' M. M. Ali علاء محمد علي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: 4 Pages: 7-9
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Removing gutta-percha (GP) during post space preparation is common in dental practice. The aim ofthis study was to compare the effect of using two types of rotary instruments (peeso reamers and Core-Remover) forGP removal on the apical sealing ability of GP in three obturation techniques (lateral condensation, thermafil, andsoftcore) using dye penetration method.Materials and method: Sixty palatal roots of freshly extracted human maxillary first molars were sectioned andprepared with ProTaper manual system in crown-down manner to size F4.. Samples divided randomly into 3 groups(20 roots each) according to the method of obturation; group A: Lateral condensation, group B: Soft-Core andgroup C: Thermafil. All samples received GP removal after 7 days incubation (37˚C and 100% humidity) either usingPeeso reamer (groups A1, B1 and C1) or Core Remover (groups A2, B2 and C2) (10 roots each group). The sampleswere sealed coronally, immersed in Indian ink and incubated for a week. Roots were demineralized with a 5% nitricacid solution, cleared in methyl salicylate and examined using a stereomicroscope under 40X magnification withcalibrated grid to establish the degree of apical dye penetration in millimeters.Results: Data were collected and subjected to descriptive and inferential statistical analysis (ANOVA and t-test) andthere was no significant difference between using peeso reamer and core remover.Conclusion: Apical sealing ability of remaining GP is less affected by the technique of GP removal


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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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 Apical Seal in Root Canals Prepared with Rotary ProTaper Files and Obturated by Different Methods

Authors: Raghad A Al-Askary --- Wiaam M O Al-Ashou --- Sabah A Ismail
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 18 Pages: 390-396
Publisher: Mosul University جامعة الموصل

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Aims: The aim of this in vitro study was to evaluate the apical sealing ability of matched-taper Single-cone, Thermafil, and Cold lateral condensation obturations. Materials and Methods: Thirty-six ex-tracted human lower canine teeth were instrumented to size (F3) with ProTaper rotary instruments after cutting of their crowns to the cement-enamel junction CEJ. The working length was determined for each tooth. The teeth were divided into (3) groups (10) of each and (6) teeth were used as a positive and negative control groups. The teeth were obturated with matched-taper Single-cone, Thermafil, and lateral condensation techniques. Tgadseal was used as a root sealer in this study. A die penetration method was used to evaluate the apical seal using a stereomicroscope at 40X magnification. One-way analysis of variance and Duncan's tests were used for statistical analysis. Results: The statistical anal-ysis of the results demonstrated that there was no statistically significant difference in microleakage between the lateral condensation and Thermafil groups. The matched taper single cone showed the least microleakage with a significant difference than the other two groups. Conclusions: The apical sealing ability of Matched-taper Single-cone obturation was better than the lateral condensation and Thermafil techniques when the root canal was prepared using a ProTaper rotary instrumentation.


Article
An evaluation of the use different techniques of the thermoplasticized obturators on the coronal seal

Authors: Mervat M. Al-Bakri ميرفت البكري --- Hussain F. Al-Huwaizi حسين فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 2 Pages: 18-20
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of the present study was to evaluate coronal leakage of root canals obturated by varioustechniques.Methodology: Straight single rooted teeth with mature apices (6 groups of 10 teeth each). Root canals wereprepared according to the crown down technique using hand ProTaper system. Endofill root canal sealer and 2.5%sodium hypochlorite was used. Root canals were obturated using cold lateral condensation Thermafil and Soft Coreobturation after root canal filling the six groups was divided into two individual groups of 30 teeth. The first group of 30teeth was kept for 1 week the second 3 week at 37 oC. Teeth were immersed in india ink. Each was split andsectioned longitudinally and the maximum extent of leakage was measured using a stereomicroscopeResults: Leakage occurred whatever filling technique was used the number of teeth with gross leakage decreasedwith time up to 3 weeks. There were significant differences in coronal leakage between the various obturationtechniques after 1 week, and after 3 weeks. No statistically significant differences were found between soft-Core andcold lateral condensation after 1 week and statistically significant differences were found after 3 weeks. There werestatistically significant differences between Thermafil and lateral condensation after 1 week and no statisticallysignificant differences after 3 weeks.Conclusion: Under the conditions of the present study none of the gutta-percha obturation techniques preventedcoronal leakage. Coronal leakage increased during the first week for CLC, Thermafil and Soft-Core obturators, anddecreased after 3 weeks. Coronal leakage in the Soft-Core obturators was higher than Thermafil and CLC after oneweek. Thermafil coronal leakage was lower than others after one week. Coronal leakage in the Soft-Core obturatorshigher than Thermafil and CLC after three weeks coronal leakage was equal in Thermafil and CLC after three weeks


Article
Apical microleakage evaluation of three different root canal Obturation techniques using dye penetration evaluation method

Author: Dr. Dara H. Saeed B.D.S, M.Sc., PhD. د.دارا سعد
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2013 Volume: 10 Issue: 2 Pages: 176-183
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Background and objectives: The aim of root canal obturation in endodontictreatment is to prevent communication between the oral cavity and periapicaltissues. Several techniques had been introduced to achieve complete filling of theroot canal system. It had been noted that more researches are needed to establishstandard techniques of root canal filling, and all the techniques should becompared for filling root canals. The aim of this study was to compare the apicalsealing ability of three different obturation techniques.Methods: Thirty single rooted teeth were collected and randomly divided into threegroups. There were 10 teeth in each group. The teeth were obturated by guttapercha as follows: Groups 1 with Thermafil, Groups 2 with Soft core, and Groups3 with System B. The apical leakage in these groups was evaluated using a dyepenetration method.Results: The lowest mean rank of leakage was observed for system B and the highestwas observed for the thermafil groups. The difference between Thermafil, softcore and system B was statistically not significant by using Kruskal Wallis test.Conclusion: System B obturation technique show less microleakage than soft coreand thermafil techniques although the differences was not significant.

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