The aim of this review was to provide a detailed analysis of the literature concerning the correl... more The aim of this review was to provide a detailed analysis of the literature concerning the correlation between different movement kinematics and the cyclic fatigue resistance of NiTi rotary endodontic instruments. From June 2014 to August 2015, four independent reviewers comprehensively and systematically searched the Medline (PubMed), EMBASE, Web of Science, Scopus and Google Scholar databases for works published since January 2005, using the following search terms: endodontics; nickel-titanium rotary files; continuous rotation; reciprocating motion; cyclic fatigue. In addition to the electronic searches, manual searches were performed to include articles listed in the reference sections of high-impact published articles that were not indexed in the databases. Laboratory studies in English language were considered for this review. The electronic and manual searches resulted in identification of 75 articles. Based on the inclusion criteria, 32 articles were selected for analysis of full-text copies. Specific analysis was then made of 20 articles that described the effects of reciprocating and continuous movements on cyclic fatigue of the instruments. A wide range of testing conditions and methodologies have been used to compare the cyclic fatigue resistance of rotary endodontic instruments. Most studies report that reciprocating motion improves the fatigue resistance of endodontic instruments, compared to continuous rotation, independent of other variables such as the speed of rotation, the angle or radius of curvature of simulated canals, geometry and taper, or the surface characteristics of the NiTi instruments.
ABOUD LRL. “Effect of aging on dentinal crack formation after treatment and retreatment procedure... more ABOUD LRL. “Effect of aging on dentinal crack formation after treatment and retreatment procedures: a micro-CT study”. [thesis]. Niterói: Universidade Federal Fluminense, Faculdade de Odontologia; 2018. In order to evaluate the volume of dentinal cracks and the removal filling material inside the root canal, taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted, lower incisive teeth, that presented similar root volume, were divided into two groups according to the age of the patient: Group Young (18 30 years old) and Group Old (60 years old or more). Each specimen was scanned by microcomputed tomography (micro-CT) in three stages: before any treatment, after endodontic treatment with Reciproc files (REC), and after subsequent endodontic retreatment. Each group was subdivided in two subgroups, according to the retreatment technique used: one received retreatment with REC and the other with ProTaper ...
In order to evaluate the volume of dentinal cracks and the removal filling material inside the ro... more In order to evaluate the volume of dentinal cracks and the removal filling material inside the root canal, taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted, lower incisive teeth, that presented similar root volume, were divided into two groups according to the age of the patient: Group Young (18 - 30 years old) and Group Old (60 years old or more). Each specimen was scanned by microcomputed tomography (micro-CT) in three stages: before any treatment, after endodontic treatment with Reciproc files (REC), and after subsequent endodontic retreatment. Each group was subdivided in two subgroups, according to the retreatment technique used: one received retreatment with REC and the other with ProTaper Universal Retreatment (PUR) files. The images were analyzed for differences in the volume of dentinal cracks in the middle and apical thirds of the teeth among the subgroups, according to the dentin ag...
This study evaluated the removal of the filling material during endodontic retreatment considerin... more This study evaluated the removal of the filling material during endodontic retreatment considering the presence of cracks and the dentin age. A total of 20 freshly extracted single-rooted teeth were categorized into the following two groups according to the age of the patients: Group Young (Y; aged 18-30 years) and Group Old (O; aged ≥60 years). Each tooth specimen was scanned by microcomputed tomography (micro-CT) subsequently after endodontic retreatment with the Reciproc instruments (REC). The images were analyzed for differences in the volume of dentin cracks and the presence of the filling material in the middle and apical thirds of the teeth among the groups, according to the dentin age. The micro-CT images showed that after retreatment, there were more cracks in the old root dentin than those in the young root dentin, although the difference was not statistically significant (>0.05). The greatest reduction in the filling material was achieved when the old root dentin with ...
To improve the dissolution process of NiTi endodontic rotary files aiming at fragment removal and... more To improve the dissolution process of NiTi endodontic rotary files aiming at fragment removal and the recovery of the original path of the root canal during a clinically acceptable period of time. Anodic polarization curves and redox curves were obtained to determine the conditions necessary for the dissolution of endodontic files. Anodic polarization of K3 files was performed, and analysis of variance (P < 0.05) was used to compare different test times in relation to weight loss, length loss and electrical charge generated in each solution. The polarization of fragments in simulated root canals was undertaken to evaluate the dissolution process. After the tests, a size 10 K-file was used to verify the possibility to bypass the fragment. The total electrical charge of each test was obtained from the corresponding graph area. Radiographic analysis of the simulated canals was used before and after the tests to verify fragment dissolution. The weight loss values, the length loss values and the total values of electrical charge in each period of time were significantly higher (P < 0.05) in the tests using the selected solution compared with the solution previously proposed. A progressive consumption of the K3 file tip was observed up to 30 min. The anodic polarization of file fragments in simulated root canals for 60 min resulted in their partial dissolution and enabled the recovery of the original canal pathway with size 10 K-files. Increasing fluoride concentration resulted in greater active dissolution of NiTi files. The dissolution of fractured files in simulated root canals enabled the recovery of its original path during a clinically acceptable period of time.
In order to evaluate the volume of dentinal cracks taking into account the age of the dentin and ... more In order to evaluate the volume of dentinal cracks taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted lower incisive teeth presenting similar root volume, were divided into two groups according to the age of the patient: Group Young (18 - 30 years old) and Group Old (60 years old or more). Each specimen was scanned by microcomputed tomography (micro-CT) in three stages: (i) before any treatment, (ii) after endodontic treatment with Reciproc files (REC), and (iii) after subsequent endodontic retreatment. Each group was subdivided into two subgroups, according to the retreatment technique used: retreatment with REC or with ProTaper Universal Retreatment (PUR) files. For each subgroup, the images were analyzed for differences in the volume of dentinal cracks in the middle and apical thirds of the teeth , according to the dentin age. In both stages (before and after instrumentation), the micro-CT im...
The aim of this review was to provide a detailed analysis of the literature concerning the correl... more The aim of this review was to provide a detailed analysis of the literature concerning the correlation between different movement kinematics and the cyclic fatigue resistance of NiTi rotary endodontic instruments. From June 2014 to August 2015, four independent reviewers comprehensively and systematically searched the Medline (PubMed), EMBASE, Web of Science, Scopus and Google Scholar databases for works published since January 2005, using the following search terms: endodontics; nickel-titanium rotary files; continuous rotation; reciprocating motion; cyclic fatigue. In addition to the electronic searches, manual searches were performed to include articles listed in the reference sections of high-impact published articles that were not indexed in the databases. Laboratory studies in English language were considered for this review. The electronic and manual searches resulted in identification of 75 articles. Based on the inclusion criteria, 32 articles were selected for analysis of full-text copies. Specific analysis was then made of 20 articles that described the effects of reciprocating and continuous movements on cyclic fatigue of the instruments. A wide range of testing conditions and methodologies have been used to compare the cyclic fatigue resistance of rotary endodontic instruments. Most studies report that reciprocating motion improves the fatigue resistance of endodontic instruments, compared to continuous rotation, independent of other variables such as the speed of rotation, the angle or radius of curvature of simulated canals, geometry and taper, or the surface characteristics of the NiTi instruments.
ABOUD LRL. “Effect of aging on dentinal crack formation after treatment and retreatment procedure... more ABOUD LRL. “Effect of aging on dentinal crack formation after treatment and retreatment procedures: a micro-CT study”. [thesis]. Niterói: Universidade Federal Fluminense, Faculdade de Odontologia; 2018. In order to evaluate the volume of dentinal cracks and the removal filling material inside the root canal, taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted, lower incisive teeth, that presented similar root volume, were divided into two groups according to the age of the patient: Group Young (18 30 years old) and Group Old (60 years old or more). Each specimen was scanned by microcomputed tomography (micro-CT) in three stages: before any treatment, after endodontic treatment with Reciproc files (REC), and after subsequent endodontic retreatment. Each group was subdivided in two subgroups, according to the retreatment technique used: one received retreatment with REC and the other with ProTaper ...
In order to evaluate the volume of dentinal cracks and the removal filling material inside the ro... more In order to evaluate the volume of dentinal cracks and the removal filling material inside the root canal, taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted, lower incisive teeth, that presented similar root volume, were divided into two groups according to the age of the patient: Group Young (18 - 30 years old) and Group Old (60 years old or more). Each specimen was scanned by microcomputed tomography (micro-CT) in three stages: before any treatment, after endodontic treatment with Reciproc files (REC), and after subsequent endodontic retreatment. Each group was subdivided in two subgroups, according to the retreatment technique used: one received retreatment with REC and the other with ProTaper Universal Retreatment (PUR) files. The images were analyzed for differences in the volume of dentinal cracks in the middle and apical thirds of the teeth among the subgroups, according to the dentin ag...
This study evaluated the removal of the filling material during endodontic retreatment considerin... more This study evaluated the removal of the filling material during endodontic retreatment considering the presence of cracks and the dentin age. A total of 20 freshly extracted single-rooted teeth were categorized into the following two groups according to the age of the patients: Group Young (Y; aged 18-30 years) and Group Old (O; aged ≥60 years). Each tooth specimen was scanned by microcomputed tomography (micro-CT) subsequently after endodontic retreatment with the Reciproc instruments (REC). The images were analyzed for differences in the volume of dentin cracks and the presence of the filling material in the middle and apical thirds of the teeth among the groups, according to the dentin age. The micro-CT images showed that after retreatment, there were more cracks in the old root dentin than those in the young root dentin, although the difference was not statistically significant (>0.05). The greatest reduction in the filling material was achieved when the old root dentin with ...
To improve the dissolution process of NiTi endodontic rotary files aiming at fragment removal and... more To improve the dissolution process of NiTi endodontic rotary files aiming at fragment removal and the recovery of the original path of the root canal during a clinically acceptable period of time. Anodic polarization curves and redox curves were obtained to determine the conditions necessary for the dissolution of endodontic files. Anodic polarization of K3 files was performed, and analysis of variance (P < 0.05) was used to compare different test times in relation to weight loss, length loss and electrical charge generated in each solution. The polarization of fragments in simulated root canals was undertaken to evaluate the dissolution process. After the tests, a size 10 K-file was used to verify the possibility to bypass the fragment. The total electrical charge of each test was obtained from the corresponding graph area. Radiographic analysis of the simulated canals was used before and after the tests to verify fragment dissolution. The weight loss values, the length loss values and the total values of electrical charge in each period of time were significantly higher (P < 0.05) in the tests using the selected solution compared with the solution previously proposed. A progressive consumption of the K3 file tip was observed up to 30 min. The anodic polarization of file fragments in simulated root canals for 60 min resulted in their partial dissolution and enabled the recovery of the original canal pathway with size 10 K-files. Increasing fluoride concentration resulted in greater active dissolution of NiTi files. The dissolution of fractured files in simulated root canals enabled the recovery of its original path during a clinically acceptable period of time.
In order to evaluate the volume of dentinal cracks taking into account the age of the dentin and ... more In order to evaluate the volume of dentinal cracks taking into account the age of the dentin and the type of file system used for endodontic procedures, forty freshly extracted single-rooted lower incisive teeth presenting similar root volume, were divided into two groups according to the age of the patient: Group Young (18 - 30 years old) and Group Old (60 years old or more). Each specimen was scanned by microcomputed tomography (micro-CT) in three stages: (i) before any treatment, (ii) after endodontic treatment with Reciproc files (REC), and (iii) after subsequent endodontic retreatment. Each group was subdivided into two subgroups, according to the retreatment technique used: retreatment with REC or with ProTaper Universal Retreatment (PUR) files. For each subgroup, the images were analyzed for differences in the volume of dentinal cracks in the middle and apical thirds of the teeth , according to the dentin age. In both stages (before and after instrumentation), the micro-CT im...
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