research centers


Search results: Found 9

Listing 1 - 9 of 9
Sort by

Article
The Dissolving Capability Of Various Gutta-Percha Solvents
قابلية ذوبان أنواع مختلفة من مذيبات حشوة الجذر (كتة - بيركة)

Author: Farid G. Numan فريد غياب نعمان
Journal: Al-Rafidain University College For Sciences مجلة كلية الرافدين الجامعة للعلوم ISSN: 16816870 Year: 2013 Issue: 31 Pages: 116-124
Publisher: Rafidain University College كلية الرافدين الجامعة

Loading...
Loading...
Abstract

The purpose of this in-vitro study was to compare and evaluate the efficiency of three types of chemical solvents; tetrachloroethylene, xylene and eucalyptol oil in softening gutta-percha and zinc oxide eugenol sealer. Thirty extracted human lower second premolars with single and straight canals were used in this study. All teeth had mature apices. The coronal portions of the experimental teeth were removed to standardize the length of the root (15 mm from apex to coronal end).Step-back instrumentation was performed to flare and enlarge the canals until size 45(master apical file). Lateral condensation technique was used to obturate the canals with gutta-percha and zinc oxide eugenol cement sealer, and then stored in 100% humidity at 37° for 7 days. Specimens were randomly divided into three experimental groups based on the solvent to be used (10 teeth for each group).A number 30 hedstrom file was used with a push-pull action to attempt penetration into the test sample with the addition of 0.02 ml increments of solvent. The times taken for the hedstrom file to penetrate the length of the canals were recorded.The results showed that tetrachloethylene has statistically the lowest mean of penetration time, followed by xylene while eucalyptol oil has the highest mean of penetration time.

أن الغرض من هذه الدراسة المختبرية هو لمقارنة وتقييم كفائة ثلاثة أنواع من المذيبات الكيميائية: رباعي كلور الأثيلين, زايلين وزيت اليوكاليبتوس في أذابة حشوة قناة الجذر المكونة من كتة بيركة وأوكسيد الزنك والأيجينول كمادة ختم. يتكون النموذج المستخدم في هذه الدراسة من ثلاثون سن بشري مقلوع من الضواحك الثانوية السفلى ذوات قناة جذرية مستقيمة واحدة ومكتملة التكوين.تم قطع الجزء التاجي لكل سن والأبقاء على جذر بطول 15 ملمتر, بعدها تم توسيع قنوات الجذور بأستخدام طريقة توسيع خطوة للخلف. أستخدمت طريقة الضغط الجانبي لعمل حشوات القنوات بمادة الكتة – بيركة وأوكسيد الزنك والأيجينول كمادة ختم وتم وضعها في حاضنة بدرجة حرارة 37 درجة مئوية ولمدة أسبوع. قسمت النتائج بطريقة عشوائية الى ثلاثة مجاميع أعتمادا على نوع المذيب المستخدم (كل مجموعة تحتوي على عشرة أسنان). أستخدم مبرد حجم 30 من نوع هيد ستروم لغرض أختراق مادة حشوة قناة الجذر مع أضافة 0,02 مللتر من المذيب الكيمياوي لغرض الأستمرار في الأختراق. قيمت قابلية الأذابة لكل نوع من أنواع المذيبات عن طريق حساب الوقت اللازم للمبرد (هيد ستروم) لأختراق طول القناة بالكامل. أظهرت النتائج الأحصائية أن معدل الوقت الذي يستغرقه رباعي كلور الأثيلين للنفاذ هو الأقل ثم يليه الزايلين بينما يستغرق زيت اليوكاليبتوس أطول مدة للنفاذ.


Article
Rapid Decontamination of Gutta Percha Cones Using Different Chemical Agents

Authors: Mahmoud Y Taha --- Nawal A AL-Sabawi --- Enas Y Shehab
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2010 Volume: 10 Issue: 15 Pages: 30-37
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aim: To compare the effectiveness of four different disinfectant solutions in rapid decontamination of gutta percha cones. Materials and Methods: In this experimental study, 320 gutta percha cones were placed in bacterial suspensions of Staphylococcus aureus, Escherichia coli, Bacillus subtilis, and Can-dida albicans for 30 minutes, and then immersed in disinfectant solutions (6% hydrogen peroxide, 2% chlorhexidine, 1% sodium hypochlorite, and 70% ethyl alcohol) for 1, 5, 10, and 15 minutes. After that, the cones were aseptically transferred to the test tubes containing 4 ml brain heart infusion broth, and then cultured on selected agar media and number of colonies was estimated after 24 hours incubation at 37 oC. Results: Hydrogen peroxide was effective in 1 minute, while chlorhexidine and sodium hypoch-lorite after 10 minutes, and ethyl alcohol in 5 minutes for decontamination of gutta percha cones. Con-clusion: Hydrogen peroxide was the most effective agents in decontamination of gutta perch cones


Article
An evaluation of apical microleakage in roots filled with thermoplastic synthetic polymer based root canal filling material (RealSeal 1 bonded obturation)

Authors: Nadine J. Adbul-rada نادين جمال عبد الرضا --- Adel F. Ibraheem عادل فرحان ابراهيم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 2 Pages: 21-26
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Background: This study aimed to evaluate and compare the apical microleakage of roots canal filled with coldlateral condensation of gutta-percha, cold lateral condensation of Resilon, Thermafil and RealSeal1 bondedobturation.Materials and methods: Sixty freshly extracted maxillary first molars with straight palatal roots .Using diamond disc burwith straight hand piece and water coolant the palatal roots of teeth were sectioned perpendicular to the long axisat the furcation area. All roots were prepared with crown-down technique using hand ProTaper system (Sx-F4).Theprepared roots randomly divided into 4 groups of fifteen roots each; the groups obturated with different obturationtechnique. In Group 1 roots obturated with( lateral condensation of gutta-percha), Group 2 was obturatedwith(lateral condensation of Resilon),group3 was obturated with (Thermafil) while in group4 obturated with( RealSeal1 bonded obturation).All the samples sealed coronally and stored in normal saline at 37°C for one week ,then all theroots submerged Indian ink for one week. The roots were cleared and the degree of linear dye penetration wasmeasured in millimeter by stereomicroscope under 40X magnification with calibrated scale ocular grid.Results: The results showed that the RealSeal1 bonded obturation leaked apically significantly higher than other testgroups, while the group of lateral condensation of gutta-percha exhibited the least value of apical microleakage.Conclusion: The complete hermetic apical seal cannot be created neither with gutta-percha nor with Real Seal1bonded obturation


Article
This study concerns with the incidence of dry sockets among a sample of patients attending different dental clinics after tooth extraction for three consecutive years in relation to their age, sex, tooth location and to patients perceived stress.Dry socket patients records were investigated for age, sex and tooth location. And a control group was chosen of exactly the same age and sex distribution as that of the patients but free from any symptoms . A questionnaire sheet with a list of possible life events for the last twelve months before the extractions were distributed among both, then the results was subjected to statistical analysis.Out of 956 patients, 58 (6%) developed dry sockets, (36%) of them were located on wisdom teeth with the lower ones comprising (25.86%). There were significant difference in mean perceived psychological stress between the patients (477.07 ± 7.38 L.C.U) and those in control group (240.44 ± 7.12 L.C.U.) regarding different ages and sexes.There were higher incidence of dry sockets in this study than most other studies around the world and female /male ratio was nearly equal. They occurred mostly on lower and posterior more than upper and anterior teeth wisdom teeth were most, highly affected, and there were a relationship between psychological stress and dry socket.

Author: Sabah A. Ismail صباح عبد الوهاب اسماعيل
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2013 Volume: 2 Issue: 2 Pages: 169-174
Publisher: Tikrit University جامعة تكريت

Loading...
Loading...
Abstract

The purposes of this study was to investigate the effect of sodium hypochlorite (SH) and chlorhexidine (CH) disinfectant solusions on surface texture and mechanical properties of gutta percha (GP) cones at different concentrations and time intervals. In this study, 190 GP cones size 100 were used. SH solutions at (1%, 2.5%, 5.25%) and CH solutions at (1%, 1.5%, 2%) were used for GP cones disinfection by submerging cones for (10 min, 15 min, 20 min) in each of the solutions to be tested, in which 10 cones were used for each disinfectant solution at every time interval, and 10 cones remain fresh as a control. Surface texture determined by stereomicroscope. Mechanical properties measured by digital universal testing machine. SH solutions at (2.5% and 5.25%) decrease tensile strength, increase modulus of elasticity, decrease percentage of elongation , and left a numerous pitting on GP cones after (10, 15, 20) minutes of disinfection which were significantly different from fresh control cones, 1% SH , and CH at (1%, 1.5%, 2%).Within the limitations of this study, SH at 1% and CH at (1%, 1.5%, 2%) concentrations can be considered the most safe solutions for disinfection of GP cones.


Article
Elevation in surface temperature of root canals obturated with different thermoplasticized gutta-percha obturation techniques-an in vitro study

Loading...
Loading...
Abstract

Background: Many studies have been conducted to evaluate the effect of using a hot material in the root canal and its potential for causing damage to the tooth supporting structure.Materials and methods: thirty permanent premolars were obturated with thermoplasticized Gutta-Percha using three different obturation techniques: soft core, Thermafil, and obtura to evaluate the rise in temperature on the root surface using a multipurpose digital thermometer.Results: temperature increases was significantly greater for Obtura versus Soft core (p<0.003), not significant for Thermafil versus Soft core (p<0.087), and Thermafil versus Obtura (p<0.125).Conclusions: temperatures rise on the root surface were below the critical level and, therefore, should not cause damage to the periodontal ligament


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

Loading...
Loading...
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
The effect of dowel space preparation on the apical seal of Resilon & Gutta-percha obturation materials. (An in vitro comparative study)

Authors: Prof. Dr. Abdul Karim J. Al-Azzawi, B.D.S., M.Sc. Abstract د. عبد الكريم العزاوي --- Dr.Saleh M. F. Al-Kasaki B.D.S د.صلاح القيسي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2008 Volume: 5 Issue: 4 Pages: 327-334
Publisher: Al-Mustansyriah University الجامعة المستنصرية

Loading...
Loading...
Abstract

Aim: The aim of this in vitro study was to compare the effect of immediate versus delayed dowel space preparation using peeso reamers on the apical seal of roots filled by Gutta-percha with two types of resin based-sealers (AH26 and AH Plus) and by Epiphany obturation system.Methodology: Sixty freshly extracted human teeth with single and straight canals were used in this study. The roots were instrumented using the step-back technique, instrumentation was accomplished by using the Gates-Glidden drills with copious irrigation of 2.5% sodium hypochlorite and 17% solution of aqueous EDTA to remove smear layer. The roots were randomly divided into 3 main groups according to the type of obturation materials using lateral condensation technique (20 teeth for each group):Group A: Gutta-percha + AH26 root canal sealer.Group B: Gutta-percha + AH Plus sealer.Group C: Resilon+ Epiphany sealer+ prime. (Epiphany obturation system)Then each group divided into two subgroups according to the time of dowel space preparation either immediately after obturation or after one week. The external surfaces of all roots were coated by two layers of sticky wax except for the apical 2 mm and were then submerged in 2% methylene blue dye for 3 days at 37ºC. After that, all roots were longitudinally sectioned for linear measurement of dye penetration through the apical foramen using a stereomicroscope. The data obtained were analyzed statistically using ANOVA and Student t-tests.Results: Significantly less apical leakage in roots filled by gutta-percha with AH Plus than those filled by gutta-percha with AH26 and those filled by Epiphany obturation system for delayed dowel space preparation (P< 0.05) and there was a significantly less apical leakage in roots filled by Epiphany obturation system that prepared immediately after obturation than those received delayed preparation (P< 0.05).Conclusion: All the groups had apical leakage what ever the type of obturation material or time of dowel space preparation.


Article
Evaluation of Two Rotary Nickel-Titanium Systems for Gutta Percha Removal during Endodontic Retreatment

Author: Nawal A Al-Sabawi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 21 Pages: 21-28
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: The purposes of this study were to evaluate the efficacy of two rotary systems (RaCe and ProTaper) compared with hand files, in the removal of gutta percha during retreatment. Retreatment time, amount of apically extruded debris, and procedural errors were also evaluated. Materials and Methods: Forty extracted mandibular premolars were instrumented to size 30 and obturated with lat-eral condensed gutta percha. Then teeth were randomly divided into four groups, 10 teeth each. Re-moval was performing with chloroform and one of the following techniques: (I) Hedstrom and K-files, (II) Hedstrom and hand ProTaper, (III) Rotary ProTaper, and (IV) RaCe. Retreatment times, apically extruded debris, and broken instrument were recorded. The root split longitudinally viewed under ste-reomicroscope at (10 X) photograph are taken, and then the area of remaining filling material and whole area of the canal were measured using SigmaScan software. Data were analyzed statistically using one way ANOVA and Tukey test. Results: The two rotary systems left significantly less remain-ing filling material, faster, and produce less amount of apically extruded debris compared to hand files. There was no significant difference between the two rotary systems, but there was significant differ-ence between the two hand files regarding the amount of remaining filling materials. Only RaCe exhib-its no fracture instruments during retreatment. Conclusions: The two rotary systems were found to be effective and faster in removing gutta percha during endodontic retreatment.


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

Loading...
Loading...
Abstract

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.

Listing 1 - 9 of 9
Sort by
Narrow your search

Resource type

article (9)


Language

English (9)


Year
From To Submit

2019 (1)

2014 (1)

2013 (4)

2012 (1)

2010 (1)

More...