scholarly journals Efficacy of Two Rotary Instruments For Gutta Percha Removal During Root Canal Retreatment

2014 ◽  
Vol 4 (2) ◽  
pp. 56-60 ◽  
Author(s):  
JS Dhillon ◽  
A Bhagat ◽  
G Chhabra
Keyword(s):  
Ex Vivo ◽  
Root Canals ◽  
Gutta Percha ◽  
Group I ◽  
Rotary Instruments ◽  
Root Canal Retreatment ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Research And Education

Aim - Evaluate the efficacy of Pro Taper and Pro Taper Retreatment instruments in the removal of gutta-percha during retreatment of straight root canals in comparison with Hedstrom files. Methodology -The root canals of 30 Maxillary central incisors were instrumented by step back procedure and obturated with lateral condensation before the teeth were randomly divided into three groups of 10 specimens each i.e. Group I-using Hfiles, Group 2- using Pro Taper and Group 3- using Pro Taper retreatment. Radiographs were taken after the filling removal and the canal wall cleanliness was evaluated. Roots were divided into apical, middle and coronal parts and scored on a scale of 0 (no debris), 1(25-50% of walls covered with debris and 3 (>50% of walls covered with debris).Number of fractured instruments were also evaluated in each group. Results-There was no significant difference (p>0.05) between the three groups in terms of the debris seen radio graphically after retreatment. Conclusion - All systems evaluated ex vivo were equally effective in removing gutta percha during retreatment. DOI: http://dx.doi.org/10.3329/bjdre.v4i2.20250 Bangladesh Journal of Dental Research and Education Vol.4(2) 2014: 56-60

scholarly journals Efficacy of ProTaper Retreatment System in Root Canals Obturated with Gutta-Percha Using Two Different Sealers and GuttaFlow

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Jaya Siotia ◽  
Shashi Rashmi Acharya ◽  
Sunil Kumar Gupta
Keyword(s):  
Area Ratio ◽  
Variance Test ◽  
Root Canals ◽  
Gutta Percha ◽  
Significant Difference ◽  
Ah Plus ◽  
Group 3 ◽  
Group 2 ◽  
Silicon Based ◽  
Group 1

Objective. To compare the efficacy of ProTaper retreatment files in removing three different obturating materials.Study Design. Forty-five human, single-rooted premolars were divided into three experimental groups. Group 1 was obturated with gutta-percha and AH Plus sealer, Group 2 was obturated with gutta-percha and zinc oxide eugenol sealer, and Group 3 was obturated with GuttaFlow. Retreatment was done using the ProTaper universal rotary retreatment files. Root halves were visualized using magnifying loops at 3X magnification and optical stereomicroscope at 10X magnification. Images were analyzed using AutoCAD 2004 software to calculate area of the remaining debris in the canal. For statistical analysis were used variance test and ANOVA.Results. Total debris/canal area ratio between the three groups showed a statistically significant difference (P<0.001).Conclusion. ProTaper retreatment system did not produce completely clean canals in any of the groups. However, it had the best efficacy towards removing silicon based obturating material GuttaFlow.

scholarly journals To Evaluate and Compare the Efficacy, Cleaning Ability of Hand and Two Rotary Systems in Root Canal Retreatment

2013 ◽  
Vol 14 (3) ◽  
pp. 440-444 ◽  
Author(s):  
Jyoti Sachdeva ◽  
Chetan R Patil ◽  
Venugopal Thangala ◽  
Pabbati Ravi Kumar ◽  
Akash Krishna
Keyword(s):  
Clinical Significance ◽  
Root Canal ◽  
Gutta Percha ◽  
Visual Scoring ◽  
Root Canal Retreatment ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Hand Instrumentation ◽  
Group 1

ABSTRACT Aim To evaluate and compare the efficacy, cleaning ability of hand and two rotary systems in root canal retreatment. Methodology Sixty extracted premolars were retreated with following systems: Group 1—ProTaper Universal retreatment files, Group 2—ProFile system, Group 3—H-file. Specimens were split longitudinally and amount of remaining gutta-percha on the canal walls was assessed using direct visual scoring with the aid of stereomicroscope. Results were statistically analyzed using ANOVA test. Results Completely clean root canal walls were not achieved with any of the techniques investigated. However, all three systems proved to be effective for gutta-percha removal. Significant difference was found between ProTaper universal retreatment file and H-file, and also between ProFile and H-file. Conclusion Under the conditions of the present study, ProTaper Universal retreatment files left significantly less guttapercha and sealer than ProFile and H-file. Clinical significance Rotary systems in combination with gutta-percha solvents can perform superiorly as compared to the time tested traditional hand instrumentation in root canal retreatment. How to cite this article Shivanand S, Patil CR, Thangala V, Kumar PR, Sachdeva J, Krishna A. To Evaluate and Compare the Efficacy, Cleaning Ability of Hand and Two Rotary Systems in Root Canal Retreatment. J Contemp Dent Pract 2013;14(3):440-444.

scholarly journals Fracture resistance of immature teeth filled with mineral trioxide aggregate, bioaggregate, and biodentine

2016 ◽  
Vol 10 (02) ◽  
pp. 220-224 ◽  
Author(s):  
Emre Bayram ◽  
Huda Melike Bayram
Keyword(s):  
Fracture Resistance ◽  
Mineral Trioxide Aggregate ◽  
Mean Values ◽  
Root Canals ◽  
Immature Teeth ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Post Hoc ◽  
Group 1

ABSTRACT Objective: The purpose of this study was to evaluate fracture resistance of teeth with immature apices treated with coronal placement of mineral trioxide aggregate (MTA), bioaggregate (BA), and Biodentine. Materials and Methods: Forty-one freshly extracted, single-rooted human premolar teeth were used for the study. At first, the root length was standardized to 9 mm. The crown-down technique was used for the preparation of the root canals using the rotary ProTaper system (Dentsply Maillefer, Ballaigues, Switzerland) of F3 (30). Peeso reamer no. 6 was stepped out from the apex to simulate an incompletely formed root. The prepared roots were randomly assigned to one control (n = 5) and three experimental (n = 12) groups, as described below. Group 1: White MTA (Angelus, Londrina, Brazil) was prepared as per the manufacturer's instructions and compacted into the root canal using MAP system (Dentsply Maillefer, Ballaigues, Switzerland) and condensed by pluggers (Angelus, Londrina, Brazil). Group 2: The canals were filled with DiaRoot-BA (DiaDent Group International, Canada). Group 3: Biodentine (Septodont, Saint Maur des Fosses, France) solution was mixed with the capsule powder and condensed using pluggers. Instron was used to determine the maximum horizontal load to fracture the tooth, placing the tip 3 mm incisal to the cementoenamel junction. Mean values of the fracture strength were compared by ANOVA followed by a post hoc test. P < 0.05 was considered statistically significant. Results: No significant difference was observed among the MTA, BA, and biodentine experimental groups. Conclusion: All the three materials tested, may be used as effective strengthening agents for immature teeth.

scholarly journals Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Ayca Yilmaz ◽  
Dilek Helvacioglu-Yigit ◽  
Cansu Gur ◽  
Handan Ersev ◽  
Gullu Kiziltas Sendur ◽  
...  
Keyword(s):  
Defect Formation ◽  
In Vitro Study ◽  
Cross Sectional ◽  
Gutta Percha ◽  
Rotary Instruments ◽  
Longitudinal Length ◽  
Root Canal Retreatment ◽  
Significant Difference ◽  
Length Changes

The purpose of this study was to compare the incidence and longitudinal propagation of dentin defects after gutta-percha removal with hand and rotary instruments using microcomputed tomography. Twenty mandibular incisors were prepared using the balanced-force technique and scanned in a 19.9 μm resolution. Following filling with the lateral compaction technique, gutta-percha was removed with ProTaper Universal Retreatment (PTUR) or hand instruments. After rescanning, a total of 24,120 cross-sectional images were analyzed. The numbers, types, and longitudinal length changes of defects were recorded. Defects were observed in 36.90% of the cross sections. A total of 73 defects were comprised of 87.67% craze lines, 2.73% partial cracks, and 9.58% fractures. No significant difference in terms of new defect formation was detected between the retreatment groups. The apical and middle portions of the roots had more dentin defects than the coronal portions. Defects in three roots of the PTUR instrument group increased in length. Under the conditions of this in vitro study, gutta-percha removal seemed to not increase the incidence of dentin defect formation, but the longitudinal defect propagation finding suggests possible cumulative dentinal damage due to additional endodontic procedures. Hand and rotary instrumentation techniques caused similar dentin defect formation during root canal retreatment.

In vitro Comparative Evaluation of the Fracture Resistance of Simulated Immature Teeth reinforced with Different Apical Barriers and Obturation Combination

2016 ◽  
Vol 7 (3) ◽  
pp. 113-118
Author(s):  
Neveen A Shaheen ◽  
Nahla G El-Din El-Helbawy
Keyword(s):  
Fracture Resistance ◽  
Comparative Evaluation ◽  
Negative Control ◽  
Control Group ◽  
Root Canals ◽  
Immature Teeth ◽  
Gutta Percha ◽  
Group I ◽  
Significant Difference

ABSTRACT Aim This study aimed to assess and compare the fracture resistance of simulated immature teeth reinforced with Biodentine (BD) and mineral trioxide aggregate (MTA) as apical barriers and two root canal backfilling combination (gutta-percha/AH26, MetaSeal). Materials and methods A total of 70 extracted human maxillary incisors were randomly divided into seven groups (n = 10). The positive control group was not instrumented. For the other groups, coronal access was made and root canals were instrumented using the ProTaper, up to F5 followed by six Peeso reamers which were allowed to pass 1 mm beyond the apex to size 6 (1.7 mm) to simulate immature teeth. The apical 4 mm of their root canals was filled with either MTA or BD apical barrier, then backfilled with gutta-percha/AH26 or MetaSeal obturation combination. The negative control group was left unfilled. Composite resin was used to restore the coronal access cavities. The maximum load for fracture of each tooth was recorded utilizing a universal testing machine. Data were analyzed using two-way analysis of variance. Results The noninstrumented group I had the highest fracture resistance and differed significantly (p < 0.05) from the negative control groups. On the contrary, no significant difference was found between BD and MTA groups, regardless of the backfilling combination (p > 0.05). Conclusion There was no difference between MTA and BD apical barriers and the backfilling combination regarding their resistance to root fracture. How to cite this article Shaheen NA, El-Din El-Helbawy NG. In vitro Comparative Evaluation of the Fracture Resistance of Simulated Immature Teeth reinforced with Different Apical Barriers and Obturation Combination. World J Dent 2016;7(3):113-118.

scholarly journals Comparison of active calf muscle stretching versus ankle mobilisation on low back pain and lumbar flexibility in pronated foot subjects

2017 ◽  
Vol 4 (6) ◽  
pp. 1870 ◽  
Author(s):  
K. Vadivelan ◽  
J. S. Poyyamozhi ◽  
G. Dinesh Kumar ◽  
C. Rajan Rushender
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Calf Muscle ◽  
P Value ◽  
Lumbar Region ◽  
Low Back ◽  
Group I ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2

Background: Low back pain is the common symptom of the lumbar region that more than 80 percent of people experience in their lifetime. Methods: Quasi-experimental study was conducted with three intervention groups. Ankle mobilization (Group I), Active stretching of calf muscle (Group 2), No Intervention (Group 3). This study was carried out in the Department of Physiotherapy at SRM University, Chennai. 21 subjects were included in the study, with 7 subjects in each group. Results: Median age was found to be 20 (19–21), 19 (18–20) and 21 (20–22) in group 1, group 2 and group 3 respectively and no significant difference was seen between the groups, p value 0.11) There was a significant improvement seen in visual analogue scale, in both the intervention groups before and after intervention. The median and IQR for ankle mobilization group pre and post intervention was 6 (IQR, 5–6) and 4 (IQR, 3–5) respectively, with a p value <0.01. Conclusions: Overall results have shown that both the intervention groups have similar effects in reducing lower back pain and improving lumbar flexion, compared to the control group. 

scholarly journals Evaluation of Apical Filling after Warm Vertical Compaction using Two Different Endodontic Materials: Resilon® and Gutta-Percha

2012 ◽  
Vol 3 (2) ◽  
pp. 166-170
Author(s):  
Carla Zogheib ◽  
Etienne Medioni
Keyword(s):  
Group 4 ◽  
Gutta Percha ◽  
Anterior Teeth ◽  
Significant Difference ◽  
Ah Plus ◽  
Group 3 ◽  
Group 5 ◽  
Group 2 ◽  
Warm Vertical Compaction ◽  
Group 1

ABSTRACT Forty-eight extracted maxillary anterior teeth instrumented with ProTaper system to apical preparations 0.25, 0.40 and 0.60 mm (n = 16 each) were divided into six groups for filling as following: Group 1: Apical preparation 25/100 + gutta-percha/AH Plus sealer, group 2: Apical preparation 25/100 + Resilon/Real Seal, group 3: Apical preparation 40/100 + gutta-percha/AH plus sealer, group 4: Apical preparation 40/100 + Resilon/Real Seal, group 5: Apical preparation 60/100 + gutta-percha/AH plus, group 6: Apical preparation 60/100 + Resilon/Real Seal. All teeth were filled using the warm vertical technique. Horizontal sections at 1, 2 and 3 mm from the apex were observed by SEM under 200 × magnification. Sections were digitally photographed under a stereomicroscope and the images were transferred to a compatible PC for image analysis. The surface area of voids were calculated and compared at all levels; using the Kruskal-Wallis test with Sidak correction and Mann-Whitney U test (p > 0.05). Comparisons within each group (gutta-percha/AH plus and Resilon/Real Seal) showed the presence of voids but there was no significant difference between any level of sectioning for apical preparations of 25 and 40 (p > 0.05). The only difference was in the groups prepared to size 60 and filled with Resilon/ Real Seal which showed significantly more voids than the group filled with gutta-percha/AH plus and especially at the 3 mm level. Conclusion The system Resilon/Real Seal did not achieve better results in terms of sealing ability in the apical third when compared to the conventional gutta-percha/AH plus sealing system. How to cite this article Zogheib C, Naaman A, Medioni E. Evaluation of Apical Filling after Warm Vertical Compaction using Two Different Endodontic Materials: Resilon® and Gutta-Percha. World J Dent 2012;3(2):166-170.

Ex vivo torsional properties of a 2.5 mm veterinary interlocking nail system in canine femurs

2017 ◽  
Vol 30 (02) ◽  
pp. 118-124 ◽  
Author(s):  
Aline Macedo ◽  
John Runciman ◽  
Tom Gibson ◽  
Bruno Minto ◽  
Noel Moens
Keyword(s):  
Ex Vivo ◽  
Angular Displacement ◽  
Locking Mechanism ◽  
Significant Difference ◽  
Transverse Osteotomy ◽  
Group 3 ◽  
Low Stiffness ◽  
Group 2 ◽  
Torsional Properties ◽  
Group 1

SummaryObjective: To evaluate the torsional properties of the Targon® Vet Nail System (TVS) in small canine femurs and to compare these properties to those of the 2.4 mm LC-DCP® plates.Methods: Thirty-six cadaveric femurs were allocated to three groups (n = 12). In all bones, points just distal to the lesser trochanter and just proximal to the fabellae were marked and a midshaft transverse osteotomy was performed. Group 1: bones were fixed with the 2.5 mm TVS with the bolts applied at the pre-identified marks. Group 2: A TVS system with 25% shorter inter-bolt distance was used. Group 3: A 7-hole 2.4 mm LCDCP® plates were applied. All constructs were tested non-destructively for 10 cycles, followed by an acute torsion to failure.Results: Torque at yield was 0.806 ± 0.183 and 0.805 ± 0.093 Nm for groups 1 and 2 and 1.737 ± 0.461 Nm for group 3. Stiffness was 0.05 ± 0.01, 0.05 ± 0.007, and 0.14 ± 0.015 Nm/° for groups 1 to 3 respectively. Maximal angular displacement under cyclic loading was 16.6° ± 2.5°, 15.6° ± 2.1°, and 7.8° ± 1.06° respectively. There was no significant difference for any of the parameters between groups 1 and 2. Both torque at yield and stiffness were significantly greater between group 3 and groups 1 and 2.Clinical significance: The TVS had approximately half the torsional strength and approximately 1/3 of the stiffness of the 2.4 mm bone plate. Slippage of the locking mechanism was probably the cause of the early failure. The system should be considered as a low-strength and low-stiffness system when compared to bone plates.

scholarly journals Influence of gutta-percha points on the filling of simulated lateral canals

2005 ◽  
Vol 13 (2) ◽  
pp. 176-179 ◽  
Author(s):  
Juliana Machado Barroso ◽  
Laise Daniela Carrasco ◽  
Alexandre Capelli ◽  
Danilo Mathias Zanello Guerisoli ◽  
Paulo César Saquy ◽  
...  
Keyword(s):  
Preparation Technique ◽  
Linear Measurements ◽  
Root Canal Filling ◽  
Root Canals ◽  
Gutta Percha ◽  
Significant Difference ◽  
Classic Technique ◽  
Ah Plus ◽  
Group 2

The aim of this study was to investigate, in vitro, the percentage of filling of simulated lateral canals in teeth obturated with TP medium and standardized gutta-percha points. Twenty human mandibular canines were prepared with LA Axxess (SybronEndo) and K³ Endo rotary system (SybronEndo) up to a #50 file, according to the Free Tip Preparation Technique. During instrumentation, the root canals were alternately irrigated with 1% sodium hypochlorite and 17% EDTA. Six artificial lateral canals were prepared at the apical third of each tooth. Then, the teeth were assigned to two groups (n=10): Group 1 - filled with TP medium master gutta-percha points (Dentsply, Mailleffer); Group 2 - filled with standardized master gutta-percha points (Dentsply, Mailleffer). Root canal filling was complemented with AH Plus sealer (Dentsply, Mailleffer) and accessory gutta-percha points (Dentsply, Mailleffer), according to the classic technique. The teeth were radiographed and the images obtained were digitized. Linear measurements of the percentage of filling of the artificial lateral canals in each group were accomplished on the Image Tool 2.02 software. Statistical analysis of the data using Mann-Whitney U non-parametric test evidenced significant difference (p<0.01) between the experimental groups. The group obturated with TP medium points yielded higher percentage of filling of the lateral canals. It may be concluded that the use of master gutta-percha points with larger taper resulted in better filling of the simulated lateral canals, as compared to the use of standardized master gutta-percha points.

scholarly journals Ex vivo analysis of the debris remaining in flattened root canals of vital and nonvital teeth after biomechanical preparation with Ni-Ti rotary instruments

2006 ◽  
Vol 17 (3) ◽  
pp. 233-236 ◽  
Author(s):  
Edi Wagner Sasaki ◽  
Marcos Aurélio Versiani ◽  
Danyel Elias da Cruz Perez ◽  
Manoel D. Sousa-Neto ◽  
Yara T. Silva-Sousa ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Optical Microscope ◽  
Clinical Indication ◽  
Radiographic Examination ◽  
Pulp Tissue ◽  
Root Canals ◽  
Rotary Instruments ◽  
Working Length ◽  
Significant Difference ◽  
Pulp Vitality

The purpose of this study was to assess the presence of apical debris remaining in the apical third of flattened root canals of vital and nonvital teeth after biomechanical preparation with Ni-Ti rotary instruments. Fresh-extracted human mandibular incisors were used in this study. The teeth had clinical indication for extraction and were submitted to cold pulp vitality testing and radiographic examination. Eighteen teeth were selected and randomly assigned to two groups (n=9), according to the clinical diagnosis, i.e., pulp vitality or pulp necrosis. The canals were instrumented with the ProTaper NiTi rotary system in the following sequence: S1 - up to the middle third; SX - at the cervical third; S2- up to the apical third; and S1, F1, F2, F3 - at the working length. The canals were irrigated with 1% sodium hypochlorite, dried and were submitted to the histological processing. Sections from the apical third were analyzed by an optical microscope (X40) that was coupled to a computer where the images were captured and analyzed using specific softwares. A grid was placed over these images to assess the total canal area and the areas with debris. Mann-Whitney U-test showed no statistically significant difference (p>0.05) between the teeth with pulp vitality (6.49 ± 3.39) and those with pulp necrosis (5.95 ± 2.22). It may be concluded that the clinical condition of pulp tissue did not interfere with the amount of debris remaining in the apical third of flattened root canals prepared with Ni-Ti rotary instruments.

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