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Article
Smear Layer Removal and Apical Extrusion Evaluation Among Different Irrigating Techniques and Solutions (In vitro Comparative study)

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Abstract

Objectives: The aim of the present study was to compare the effectiveness ofEndovac, Vibringe and needle with different irrigation solutions on removal ofsmear layer and apical extrusion of irrigating solution.Methods: Seventy-two sound human premolar teeth were used and divided into threeexperimental groups (n=24) according to the type of irrigation technique used: Ingroup1 irrigation was performed with Vibringe. In-group 2 irrigation wasperformed with a 30-gauge side-vented irrigation needle. In-group 3 irrigation wasperformed with Endovac. Instrumentation was performed by using the ProTaperfiles. Each main group divided into three sub-groups (n=8) according to irrigationsolution used: In sub-group 1 Irrigation was performed with 5.25% Sodiumhypochlorite (NaOCL). In sub-group 2 Irrigation was performed with 17%Ethylene Diamin Tetra Acidic Acid (EDTA). In sub-group 3 Irrigation wasperformed with 5.25% NaOCL and 17 % EDTA. The amount of extrudedirrigating solution was then measured by subtracting the weight before finalirrigation from the weight after final irrigation using the electronic balance. Thecleanliness of smear layer removal was evaluated using scanning electronmicroscopy.Results: The results showed that the group that resulted in more irrigation extrusionwas as follow from highest to lowest: side-vented >Vibringe> Endovac. Thedifference among all groups was significant. As for cleaning results, smear layercollection in both EndoVac and Vibringe groups were less than side-vented groupand these differences were significant. When the three irrigating solutionscompared the differences among all the groups were significant and combinationof (5.25% NaOCL and 17 % EDTA) resulted in more smear layer removal.Conclusion: In conclusion, the EndoVac irrigation system extruded significantly lessirrigant solution than both the Vibringe and needle irrigation systems. Smear layercollection was least in the apical third regarding the EndoVac irrigation systemand resulted in more Smear layer removal. And combination of NaOCL andEDTA group was more effective on smear layer removal than other two groups.


Article
In Vitro The Effect of Canals Instrumented With Three Rotary Ni-Ti Systems on The Dislocation Resistanceo Guttafusion® Versus Single Cone Obturation Technique

Authors: Rafal S. Ameen --- Raghad A. Al Hashimi
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 3 Pages: 17-25
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Complete seal of the root canal system following its chemo-mechanical debridement plays a pivotal role for achieving successful endodontic treatment. This can be established by reducing the gaps between the core filling material and root canal wall.Aim: To assess and compare the dislocation resistance of root canals obturated with GuttaFusion® and TotalFill BC sealer versus single cone obturation technique and TotalFill BC sealer after instrumentation of the canals with WaveOne, ProTaper Next and ProTaper Universal system.Material and Method: Sixty extracted human permanent mandibular premolars were conducted in the current study. The teeth were decorated and left the root with 15mm length; the roots were divided randomly into three main groups, twenty roots in each group. The roots were instrumented with different rotary systems using crown down technique according to the groups: (Group I) was instrumented with WaveOne files. (Group II) was instrumented with ProTaper Next system and (Group III) was instrumented with ProTaper Universal system. For each group the same irrigation regimen was used, 3 mL of 5.25% sodium hypochlorite and 3 mL of 17% EDTA to remove the smear layer.Then, Group I was also subdivided randomly into two subgroups of ten samples each, (Group I A) obturated with single cone gutta-percha and (Group I B) filled with GuttaFusion®. Group II was divided into (Group II A) obturated with single cone gutta-percha and (Group II B) filled with GuttaFusion®. Group III was divided into (Group III A) obturated with single cone gutta-percha and (Group III B) obturated with GuttaFusion®. In the present study, TotalFill BC sealer was used for all the tested groups.Then, the roots were embedded in clear acrylic resin and each root sectioned into three sections of 2mm thick (apical, middle and coronal). The push-out bond strength values represented by (MPa) unit was calculated by dividing the load on the surface area and the last was measured in collaboration with AutoCAD system software program. Failure mode analysis was carried out to examine the type of failure in each sample by using a stereomicroscope.Results: The results showed highly significant differences among the main groups that instrumented with different rotary systems (WaveOne, ProTaper Next and ProTaper Universal system). There were highly significant differences between the two obturation techniques of the subgroups (single cone gutta-percha versus GuttaFusion®). However; Gutta-Fusion® showed highest bond strength value than single cone obturation technique. The coronal third slices of all groups showed highest value of bond strength in comparison to the middle thirds and apical thirds. In the meantime, the middle third slices showed bond strength higher than that of the apical thirds for all groups. Statistical analysis was performed by using two way ANOVA and LSD tests.Conclusions: The instrumentation techniques and the obturation materials significantly affected the push-out bond strength values of obturation system. The highest value was appointed in root canals instrumented with ProTaper Universal System; obturated with GuttaFusion® and BC sealer, whereas, the lowest bond strength was appeared at canals instrumented with ProTaper Next; obturated with single cone gutta-percha and BC sealer


Article
Evaluation of The Cleaning Effciency of Oneshape, Waveone, Reciproc and Protaper Systems Using Digital Image Morphometric Analysis (An in vitro study)

Authors: Luma A. Al-Dulaimi --- Hikmet A. Al-Gharrawi
Journal: Journal of Oral and Dental Research مجلة طب الفم والاسنان ISSN: 23106417 Year: 2017 Volume: 4 Issue: 2 Pages: 169-183
Publisher: Iraqi Association for Oral Research الجمعية العراقية لبحوث طب الفم

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Abstract

Background Complete removal of debris during the process of root canal therapy is of paramount importance in order to achieve the objectives of endodontic treatment.Objectives This in vitro study was conducted to compare the effciency of four different rotary instrumentation systems in removing dentin debris at three levels of root canals. Materials and methods Sixty freshly extracted human mandibular premolar with single straight root canals were selected and randomly divided into four groups of fهfteen teeth each; Group I: prepared by rotary ProTaper system (Full rotary technique), Group II: prepared by single fle Reciproc system (Reciprocating technique), Group III: was prepared by single fle WaveOne system (Reciprocating technique), and Group IV: was prepared by single fle OneShape system (Full rotary technique). These groups were prepared to an apical preparation corresponding to size 25 K-fle. Sodium hypochlorite (3%) was used as an irrigant in all cases. After canals preparation, the roots were split longitudinally and photographed with a professional digital camera. The images of root sections were then magnifed to 100x and the percentage of remaining dentin debris was calculated for the apical (0-3 mm), middle (3-6 mm) and coronal (6-9 mm) levels through dividing the pixels occupied by debris at each level by the total pixels representing the entire area of the canal using Adobe Photoshop CS6. Data were analyzed statistically using ANOVA and LSD tests. Results Reciproc, WaveOne and OneShape systems showed signifcantly better cleaning effciency than Protaper system in the apical and coronal levels (p < 0.05). While in the middle level, no signifcant differences were obtained among all systems (p ≤ 0.05).Conclusion Under the conditions of this study, the use of OneShape, WaveOne and Reciproc systems was signifcantly more effective than ProTaper system in eliminating debris from root canals at all levels.


Article
Comparison of apically extruded debris of different nickel titanium instruments

Author: Dr. Diyar Kh. Bakr, B.D.S., M.Sc., Ph.D.* د. ديار بكر
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2017 Volume: 14 Issue: 1 Pages: 16-23
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background and objective: During root canal instrumentation irrigants, necroticpulp tissue, microorganism and dentin debris may be extruded beyond the apexinto the periradicular tissue. These extrusions may cause flare-up. The purpose ofthis study was to compare the amount of apically extruded debris with three rotaryNickel titanium instruments.Methods: Sixty single rooted, single canalled premolars were selected. The rootswere divided randomly into three groups; (n = 10) according to the type ofinstrumentation system used, group 1“ProTaper Next” system, group 2 “OneShape” system and group 3 “Mani Silk” system. The Debris extruded during theinstrumentation was collected and dried in preweighed vials and the amount ofextruded debris was assessed with an electronic balance.Result: results showed that the Mani silk system extruded significantly less debristhan the ProTaper Next and One shape systems (P < .05), and there is nosignificant difference in apically extruded debris between ProTaper Next groupand One Shape group but the One Shape produced more debris than ProTaperNext.Conclusion: the Mani silk file instrument was behaved well during instrumentationand extruded less debris than the other groups.

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