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Rashad, Mirvet M.
- A Comparative Evaluation of Gutta-Percha and Sealer Removal of Rotary Niti File Retreatment Systems
Authors
1 Lecturer, Department of Restorative and Aesthetic Dentistry, College of Dentistry, University of Baghdad, Baghdad, IQ
2 Assistant lecturer, Department of Restorative and Aesthetic Dentistry, College of Dentistry, University of Baghdad, Baghdad, IQ
3 Assistant Professor, Department of Restorative and Aesthetic Dentistry, College of Dentistry, University of Baghdad, Baghdad, IQ
Source
Indian Journal of Forensic Medicine & Toxicology, Vol 14, No 1 (2020), Pagination: 923-927Abstract
Forty lower premolars with single ischolar_main canals prepared with ProtaperNext files to size 25, and obturated with GP/sealer using lateral compaction. Teeth divided randomly into four groups (group n=10). Protaper universal retreatment kit (PUR), D-Race desobturation files (DRD), R-Endo retreatment kit (RE) and Hedstrom (H) files (control) were used to remove GP/sealer in each group. Removal effectiveness assessed by measuring the GP /sealer remnants in the ischolar_mains after sectioning them into two halves. Stereomicroscope with a digital camera used to capture digital images. Images processed by ImageJ software to measure the percentage of GP/sealer remnants surface area in total, coronal, middle and apical areas of the canal. In the coronal area, PUR had significantly lower R% than RE and H groups, respectively (p<0.05). Also, DRD had significantly lower R% than RE (P<0.05). There was no significant difference between PUR and DRD (p>0.05), as well as no significant difference between RE and H groups(p>0.05). In the middle, apical and total ischolar_main areas, Both PUR and DRD had significantly lower R% than RE and H groups, respectively (p<0.05). There was no significant difference between PUR and DRD (p>0.05). Also, there was no significant difference in R% between RE and H groups (p>0.05).Keywords
DRace, Hedstrom, REndo, retreatment, Protaper- Cyclic Fatigue Resistance of One Curve, Hyflex EDM and Neolix NiTi Files in Simulated Curved Canals
Authors
1 Lecturer, Department of Restorative and Aesthetic Dentistry, College of Dentistry, University of Baghdad, Baghdad, IQ
2 Professor, Department of Restorative and Aesthetic Dentistry, College of Dentistry, University of Baghdad, Baghdad, IQ
Source
Indian Journal of Public Health Research & Development, Vol 11, No 2 (2020), Pagination: 2485-2489Abstract
Objectives: The aim was to evaluate the cyclic fatigue resistance of One curve (OC), Hyflex EDM (HEDM) and Neolix (NE) files in simulated curved canals.
Study Design: Forty-five NiTi files in three groups (n=15 files/group) of OC, HEDM and NE files, respectively tested in a custom-made cyclic fatigue testing device designed to have 60o curvature in a stainless-steel simulated canal with 5 mm radius of curvature. All files rotated until fracture occur to determine the time to fracture, number of cycles to fractures (NCF) and length of the fractured fragment. Scanning electron microscope (SEM) was used to examine the fracture surface topography of the broken instruments (n=2/group). ANOVA and Tukey test was used to statistically analyses the results at significance level at 95% confidence level.
Results: OC files needed more time to fracture compared to HEDM and NE files (p<0.05), respectively, However, there was no significant difference of NCF between HEDM and OC file (p>0.05). NE file has significantly lower NCF than that of HEDM and OC file (p<0.05), respectively. There was no significant difference between all files in the mean length of the fractured fragment (p>0.05). SEM images of NE showed more pores compared to OC and HEDM, however, OC revealed rougher fractured surface than that of HEDM and NE.
Conclusions: OC and HEDM showed comparable resistance to cyclic fatigue in simulated curved canals, despite metallurgical differences among those NiTi file systems. NE files showed the lowest resistance to cyclic fatigue compared to HEDM and OC file.