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Article
A Micro Computed Tomography Assessment of New Carrier-Based Root Canal Fillings

Author: Raghad A. Al-Hashimi
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 4 Pages: 21-24
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The main aim of the present study is to qualify and quantify voids formation of root canals obturatedwith GuttaCore (GC) and experimental Hydroxyapatite polyethylene (HA/PE) as new carrier-based root canal fillingsby using micro computed tomography scan.Materials and methods: In the present study, eight straight single-rooted human permanent premolar teeth areselected and disinfected, then stored in distilled water. The teeth decoronated leaving a root length of 12mm each.The root canals instrumented by using crown down technique and the apical diameter of the root canal preparedto a size # 30/0.04 for achieving standardized measurements. A 5mL of 17% EDTA used to remove the smear layerfollowed by 5mL of 2.5% NaOCl and rinsing with normal saline. Then the shaped root canals were randomlysubdivided into two groups of 4 teeth each according to the carrier-based obturation system use, GuttaCore orexperimental HA/PE. Afterwards, the obturated roots stored at 37°C with 100% humidity for 72 hours to allow forcomplete setting of the sealer. Micro-CT was then scanned to quantify the voids within the root canal space. Thedata were statistically analyzed by one-way ANOVA and post hoc comparison tests (α=0.05).Results: The root canals obturated with both obturation systems, GuttaCore andexperimental HA/PE showed voidsformation, particularly at the apical third of the root canal. GC obturation showed a lower percentage of voidsvolume (1.54%) than the experimental HA/PE obturation (2.3%). The void volume percentage in the GuttaCoresystem, however, was non-significantly different (P> 0.05) in comparison with the experimental PE/HA system.Conclusions: GuttaCore and experimental HA/PE obturators exhibited voids formation within the entire root canalspace. The experimental HA/PE obturator is comparable to the GuttaCore obturator in terms of voids qualification


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
Assessing the radiopacity of new root end filling materials using digital radiography technique

Author: Dr. Raghad A. Al-Hashimi, BDS, MSc, PhD د. رغد عبد الرزاق الهاشمي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2015 Volume: 12 Issue: 1 Pages: 10-15
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: Radiographic discrimination of root end filling materials fromsurrounding tooth structure is clinically relevant for assessing the quality ofretrograde treatment. The present study aimed at evaluating the radiopacity ofBiodentine™ and Pro Root MTA as root end filling materials using a digitalradiography technique.Materials and Methods: Specimens of BiodentineTM and Pro Root MTA testmaterials with 1mm thick and 10 mm internal diameter were prepared for digitalradiographic analysis using an aluminum washer. The radiopacity of theBiodentine™ and Pro Root MTA was assessed using dental radiographyequipment in combination with a phosphor plate digital system and a grey scalevalue aluminum step wedge with thicknesses varying from 1 mm to 10 mm insteps of 1 mm each. The degree of radiopacity of the test materials wereradiographed and compared together with the aluminum step wedge on acomputer screen using image J software. Radiopacity was expressed in mm ofequivalent aluminum step wedge. The radiopacity values of Biodentine™ and ProRoot MTA were statistically analyzed using the one way analysis of variance(ANOVA) and post-hoc test (Bonferroni test), the level of significance was set at0.05 (P<0.05). Results: The radiographic data showed that the degree ofradiopacity of Pro root MTA is significantly higher than that of Biodentine™(P<0.001). The current study reported that the ProRoot MTA showed requisiteradiopacity around 5.86 mm when compared with aluminum step wedge steps,whereas the radiopacity of Biodentine™ determined around 2.46 mm ofequivalent aluminum.Conclusion: The radiopacity of Pro Root MTA is clinically relevant that allows forclear distinction between the material and the surrounding tooth structure enablingit to be used as root end filling material. However, Biodentine showed reducedradiopacity that needs further improvement.


Article
In Vitro Comparative Assessment of Composite Nanoleakage Using Various Dentine Surface Treatments

Authors: Mohammed H. Abbood محمد عبود --- Raghad A. Al-Hashimi رغد الهاشمي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 49-55
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The treatment of dental tissues proceeding to adhesive procedures is a crucial step in the bonding protocol and decides the clinical success ofrestorations. This study was conducted in vitro, with the aim of evaluating thenanoleakage on the interface between the adhesive system and the dentine treated by five surface modalities using scanning electron microscopy and energydispersiveX-ray spectrometry.Materials and methods: Twenty five extracted premolars teeth were selected in the study. Standardized class V cavities were prepared on the buccal and lingual surfaces then the teeth divided into five main groups of (5 teeth in each group n=10) according to the type of dentine surface treatment that was used: Group (A): dentine was conditioning with Er, Cr: YSGG laser. Group (B): dentine was conditioning with (Er, Cr: YSGG laser + acid). Group (C): dentine was conditioning with (acid + Er, Cr: YSGG laser). Group (D): dentine was conditioning with acid etch. Group (E): dentine was conditioning with acid + 10% sodium hypochlorite. For All the teeth SBMP adhesive were used and restored with Z250 composite restoration then all specimens were subjected to thermocycling 500 cycles, at 5° to 55 °C. The teeth were soaked in silver nitrate suspension. Then the teeth sectioned bucco-lingually across the centre of the restorations. The specimens were characterized using scanning electron microscopy and the amount of nanoleakage was measured by EDX spectro-analysis to identify the existence of metallic silver particles.Results: Data were analysed statistically by one way ANOVA test and (LSD) Tests. The results showed that there were statistically highly significant differences among all groups of the present study.The resultshowed that the acid and laser (group III) exhibited the lowest mean value of nanoleakage at around (6.14 %), whereas the highest mean value of nanoleakage (12.83 %) was determined by the only acid (group IV).Conclusions: Treating the acid etched dentine with Er: Cr: YSGG laser showed promising results as it exhibits lowest amount of nanoleakage of the adhesive bonding system


Article
A Comparative Evaluation of Apical Seal Associated with Ultrasonic Retrograde Cavities Filled with Bioactive Material (In Vitro Study)

Authors: Raghad A. Al-Hashimi رغد الهاشمي --- Maha A. Habeeb مها حبيب --- Athil A. Al-Kinani اثيل الكناني
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 3 Pages: 15-21
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of this study was to evaluate and compare the apical microleakage around retrogradecavities prepared with ultrasonic technique and filled with (Biodentine™)Materials and methods: 40 extracted single rooted human permanent maxillary teeth with mature apices wereselected. The roots were prepared chemo-mechanically using k-files with crown-down technique and thenobturated with lateral condensation gutta-percha technique. Teeth were divided into four main groups according tothe cavity preparation method either manual or ultrasonic technique:Group A (n=10): A class I retrograde cavity at root end was prepared with traditional handpeice equipped andplacement of Biodentine with manual condensation.Group B (n=10): A class I retrograde cavity at root end was prepared with Piezoelectric ultrasonic device equippedwith ultrasonic tip with only manual compaction of the material.Group C (n=10): traditional handpeice and placement of Biodentine using both manual compaction and 5 secondultrasonic activation.Group D (n=10): Piezoelectric ultrasonic device and placement of Biodentine with both manual compaction and 5second ultrasonic compaction. The teeth were immersed in 1% aqueous Methylene blue dye for 72 hr. Then theywere sectioned longitudinally with a diamond disc and the depth of dye penetration was examined under highmagnification 20X.Results: Statistical analysis showed a highly significant difference in microleakage among the tested groups in whichPiezoelectric technique has proved superiority in retrograde cavity preparation and compaction of Biodentin whendye penetration scores were compared. So microleakage was highest with cavities prepared with handpeice andmanual application of retrograde material group A (2.73±0.39) followed by microprepared cavities group C(1.86±0.16), and it was lowest with ultrasonically-prepared cavities group B (1.09±0.28) and group D (0.26±0.19).Conclusion: ultrasonic preparation produced significantly less microleakage than conventional method. Also lessmicroleakage was observed with ultrasonic compaction of Biodentin when compared with conventional method ofcompaction.


Article
Assessing The Radiopacity of Three Resin Composite Materials Using a Digital Radiography Technique

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Abstract

Background: Radiopacity is one of the prerequisites for dental materials, especially for composite restorations. It's essential for easy detection of secondary dental caries as well as observation of the radiographic interface between the materials and tooth structure. The aim of this study to assess the difference in radiopacity of different resin composites using a digital x-ray system.Materials and methods: Ten specimens (6mm diameter and 1mm thickness) of three types of composite resins (Evetric, Estelite Sigma Quick,and G-aenial) were fabricated using Teflon mold. The radiopacity was assessed using dental radiography equipment in combination with a phosphor plate digital system and a grey scale value aluminum step wedge with thickness varying from 1mm to 10mm in steps of 1mm each. The tested materials were radiographed, we used Image J software, on a computer screen to evaluate the degree of radiopacity for each individual material and compare with the aluminum step wedge. Radiopacity was expressed in mm of equivalent aluminum step wedge. Analysis of varience (ANOVA) and Least Significant Difference (LSD) were used to investigate the significance of differences among the tested groups.Results: Statistical analysis showed highly significant difference among the tested groups (p≤0.01). Amongst, G-aenial composite shows the most radiopaque and it is above or equivalent to that of enamel, while Estelite Sigma Quick composite has the lowest radiopacity value and is equivalent to that of dentin.Conclusion: In line with previous studies, and within the limitation of our study, considerable variations in radiopacity values were found among materials depending on the radiopaque elements incorporated into the matrix. All composite materials tested complied with the ISO 4049 standard

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