Academic literature on the topic 'Rotary files'
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Journal articles on the topic "Rotary files"
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Nanavati, Komal, Farhin Katge, Manohar Poojari, Shilpa Shetty, and Aishwarya Kamble. "Comparative Evaluation of Apically Extruded Debris during Pulpectomy Procedure in Primary Molar Teeth Using Two Different Rotary Systems and Hand Files: An In Vitro Study." International Journal of Dentistry 2022 (June 6, 2022): 1–8. http://dx.doi.org/10.1155/2022/9433225.
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Background. Successful outcome of endodontic treatment depends on chemomechanical preparation of the tooth. However, during canal preparation, debris may extrude through the apical foramen causing postoperative complications. The aim of this study is to evaluate and compare the amount of apically extruded debris during the pulpectomy procedure in primary molar teeth using two different rotary files and hand files. Materials and Methods. Distal roots of sixty extracted primary molars were divided into three groups: group A: Prime Pedo™ pediatric rotary files, group B: DXL-Pro Pedo™ pediatric rotary files, and group C: hand files. Myers and Montgomery experimental model was used. Preweighed Eppendorf tubes were used to collect apically extruded debris. The tubes were then placed in an incubator at 70°C for 5 days. The weight of the debris attained was determined. The data were analyzed using ANOVA and post hoc Bonferroni test. Results. Hand files produced more apical debris extrusion ( P < 0.05 ). Prime Pedo™ pediatric rotary files produced the least debris ( P < 0.05 ). Conclusion. Prime Pedo™ and DXL-Pro Pedo™ pediatric rotary files extruded significantly lower amount of debris apically during pulpectomy as compared to hand files. Rotary files can be considered an alternative to hand files in pediatric endodontics.
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Pitchiah, Pragadeesh A., and Prathima G. Shivashankarappa. "Rotary Files in Pediatric Dentistry: From Then Till Now." Journal of Scientific Dentistry 10, no. 2 (2020): 55–57. http://dx.doi.org/10.5005/jp-journals-10083-0926.
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ABSTRACT The introduction of adult NiTi rotary file system for children was a revolution in the field of pediatric endodontics. With the use of these files, cost-effective, consistent obturations were made possible in shorter instrumentation time. The various restraints of adult rotary files such as file length and taper created the need for newer rotary file system. These voids were fulfilled with the advent of exclusive pediatric rotary file—Kedo-S file system. In this article, we have discussed how the innovative pediatric rotary files have made its mark overpowering the limitations of the existing adult rotary file system in children. How to cite this article: Pitchiah PA, Shivashankarappa PG. Rotary Files in Pediatric Dentistry: From Then Till Now. J Sci Dent 2020;10(2):55–57.
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Rajkhan, Wael Hisham, Abdullah Hussain Alasmari, Abduljalil Bader Alhadi, Abrar Zainalabiddin Alharbi, Nwaf Mohammed Khwaji, Remaz Fahad Alannaz, Hassan Awadh Alshehri, et al. "Rotary endodontic files versus manual files for root canal treatment." International Journal Of Community Medicine And Public Health 8, no. 10 (September 27, 2021): 5113. http://dx.doi.org/10.18203/2394-6040.ijcmph20213688.
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Many studies have been published to compare the efficacy of root canal filling with either rotary and manual instrumentation. The most commonly reported factors included instrumentation, obturation time and to obturation quality. Besides, the different studies in the literature have used different assessment tools and parameters of their outcomes. In addition, to using different rotary instrumentation techniques. In thisliterature review, we have formulated strong evidence regarding the effectiveness of rotary and manual instrumentation files for root canal filling based on the findings from the current studies in the literature. Our results indicate the effectiveness of rotary instrumentation in reducing the root canal instrumentation time and enhancing the obturation and filling quality as compared to the manual instrumentation techniques. Our findings also indicate the potential variability in the effectiveness between the different rotary instrumentation techniques. However, it was not an area of concentration among the different studies in the literature. Thus, to formulate such evidence, further relevant investigations to this topic might be required. Finally, we recommend that rotary endodontic files should be indicated for the root canal filling settings to obtain better outcomes and alleviate the associated quality of work.
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Amit Gandhi and Taru Gandhi. "Comparison of canal transportation and centering ability of hand Protaper files and rotary Protaper files by using micro computed tomography." RSBO 8, no. 4 (December 28, 2012): 375–80. http://dx.doi.org/10.21726/rsbo.v8i4.1085.
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Introduction and objective: The aim of the present study was to compare root canal preparation with rotary ProTaper files and hand ProTaper files to find a better instrumentation technique for maintaining root canal geometry with the aid of computed tomography. Material and methods: Twenty curved root canals with at least 10 degree of curvature were divided into 2 groups of 10 teeth each. In group I the canals were prepared with hand ProTaper files and in group II the canals were prepared with rotary ProTaper files. Image analysis was performed at four levels 4mm, 6mm, 9mm, and 12mm from the root apex to assess changes in canal transportation and centering ratio using computed tomography (CT). Results: Data suggest that rotary ProTaper files presented the best outcomes for both variables evaluated. Rotary ProTaper files caused lesser transportation and remained better centered in the canal than hand ProTaper files. Conclusion: The canal preparation in natural teeth with rotary Protaper files showed lesser transportation and better centering ration than hand ProTaper files.
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Dr, Neeta S. Padmawar, Aparna Palekar Dr, Savita Thakkannavar Dr, Shridhar Shetty Dr, Shilpa Pharande Dr, and Swati Pustake Dr. "Pediatric Rotary Files: Evolution to Revolution." International Journal of pharma and Bio Sciences 11, no. 6 (November 30, 2021): 14–19. http://dx.doi.org/10.22376/ijpbs/lpr.2021.11.6.l14-19.
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The main goal of pulp therapy in primary dentition is to preserve the primary tooth thus protecting future normal occlusion. Routinely, pulp debridement and canal shaping are done by manual H-files, K-files, Broach, etc. Manual instrumentation may be time- consuming, thus impacting the behaviour of the child negatively. Thus arises the need for alternate instrumentation which will reduce the time required for treatment with better treatment outcomes. In 1988, Walia et al. introduced Nickel-Titanium (Ni-Ti), which revolutionized the discipline of Endodontics. These Ni-Ti files have advantage of shape memory and super elasticity thus improving the canal preparation and resulting in better shaped canals. In 2002, for first time Barr et al reported the use of rotary Ni-Ti files for the therapeutic purpose during Pulpectomy procedure in pediatric patient. He observed better acceptance by pediatric patient and good quality obturation. Till 2016, pulpectomy procedures were accomplished by the combination of hand files and adult rotary files. Adult rotary files are designed according to the morphology for permanent teeth and adult jaw size, thus the use of adult rotary files are in primary teeth may result in lateral perforation due to softer dentine of roots of primary teeth and may cause discomfort to the child thus making child unco-operative. But in 2016, Ganesh et al., pioneered the specialization of Paediatric Endodontics with his invention of specially designed rotary files. Their shape was specially designated for application in tortuous canals of primary teeth. Presently, a variety of pediatric rotary files like Kedo-STM (India), Pro AF Baby GoldTM (India),PrimePedoTM (India), DXL-ProPedoTM (India), NeolixTM (France),Denco® Kids files (China) and, Sani® Kid rotary files (China). This review is an album of these newer files and clinical and in-vitro research on them.
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Faus-Llácer, Vicente, Nirmine Hamoud-Kharrat, María Teresa Marhuenda Ramos, Ignacio Faus-Matoses, Álvaro Zubizarreta-Macho, Celia Ruiz Sánchez, and Vicente Faus-Matoses. "Influence of the Geometrical Cross-Section Design on the Dynamic Cyclic Fatigue Resistance of NiTi Endodontic Rotary Files—An In Vitro Study." Journal of Clinical Medicine 10, no. 20 (October 14, 2021): 4713. http://dx.doi.org/10.3390/jcm10204713.
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The aim of this study was to analyze and compare the influence of the geometrical cross-section design on the dynamic cyclic fatigue resistance of NiTi endodontic rotary files. Materials and Methods: Forty sterile endodontic rotary files were selected and distributed into the following study groups: A: 25.06 double S-shaped cross-section NiTi alloy endodontic rotary files (Mtwo) (n = 10); B: 20.04 rectangular cross-section NiTi alloy endodontic rotary files (T Pro E1) (n = 10); C: 25.04 convex triangular cross-section NiTi alloy endodontic rotary files (T Pro E2) (n = 10); and D: 25.06 triangular cross-section NiTi alloy endodontic rotary files (T Pro E4) (n = 10). A cyclic fatigue device was used to conduct the static cyclic fatigue tests with stainless steel artificial root canal systems with 200 µm and 250 µm apical diameter, 60° curvature angle, 3 mm radius of curvature, 20 mm length, and 4% and 8% taper. The results were analyzed using the ANOVA test and Weibull statistical analysis. Results: All the pairwise comparisons presented statistically significant differences between the time to failure and number of cycles to failure for the cross-section design study groups (p < 0.001). Conclusions: the double S-shaped cross-section of Mtwo NiTi endodontic files shows higher cyclic fatigue resistance than the rectangular cross-section of T Pro E1 NiTi endodontic files, the convex triangular cross-section of T Pro E2 NiTi endodontic files, and the triangular cross-section of T Pro E4 NiTi endodontic files.
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Srinivas, Abhinaya, LGanesh Jeevanandan, Lavanya Govindaraju, and Erulappan Muthu Ganapathi Subramanian. "Comparative Evaluation of The Efficacy Of Rotary file system (Kedo-S) Vs Hand K-Files In Root Canal Preparation Of Primary Teeth Using Cone Beam Computed Tomography (CBCT) - An In Vitro Study." Brazilian Dental Science 22, no. 2 (April 30, 2019): 197–202. http://dx.doi.org/10.14295/bds.2019.v22i2.1705.
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Objective: To evaluate the efficacy of rotary Kedo-S and hand K-files in shaping ability in primary canines using cone beam computed tomography. Materials and Methods: Thirty extracted primary maxillary and mandibular canines were selected. Using cone beam computed tomography the teeth were scanned before instrumentation. In Group I, the teeth were prepared using stainless steel K file up to the size of 40. In the Group II teeth, U1 size Kedo-S rotary file was used in crown down technique. The instrumented teeth were scanned again with cone beam computed tomography and the images were compared. Results: The canal taper was more conical for rotary Kedo-S files as compared to K-files, which was statistically significant. Conclusion: Canal preparation with Rotary files resulted in more conical canals when compared to manual instrumentation in primary teeth that contributes to more uniform obturation.KeywordsCBCT; Hand K-files; Kedo-S file system; Primary teeth; Pulpectomy; Rotary instrumentation.
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Jeevanandan, Ganesh, and Eapen Thomas. "Volumetric analysis of hand, reciprocating and rotary instrumentation techniques in primary molars using spiral computed tomography: An in vitro comparative study." European Journal of Dentistry 12, no. 01 (January 2018): 021–26. http://dx.doi.org/10.4103/ejd.ejd_247_17.
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ABSTRACT Objective: This present study was conducted to analyze the volumetric change in the root canal space and instrumentation time between hand files, hand files in reciprocating motion, and three rotary files in primary molars. Materials and Methods: One hundred primary mandibular molars were randomly allotted to one of the five groups. Instrumentation was done using Group I; nickel–titanium (Ni-Ti) hand file, Group II; Ni-Ti hand files in reciprocating motion, Group III; Race rotary files, Group IV; prodesign pediatric rotary files, and Group V; ProTaper rotary files. The mean volumetric changes were assessed using pre- and post-operative spiral computed tomography scans. Instrumentation time was recorded. Statistical analysis to access intergroup comparison for mean canal volume and instrumentation time was done using Bonferroni-adjusted Mann-Whitney test and Mann–Whitney test, respectively. Results: Intergroup comparison of mean canal volume showed statistically significant difference between Groups II versus IV, Groups III versus V, and Groups IV versus V. Intergroup comparison of mean instrumentation time showed statistically significant difference among all the groups except Groups IV versus V. Conclusion: Among the various instrumentation techniques available, rotary instrumentation is the considered to be the better instrumentation technique for canal preparation in primary teeth.
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Roda-Casanova, Victor, Antonio Pérez-González, Álvaro Zubizarreta-Macho, and Vicente Faus-Matoses. "Fatigue Analysis of NiTi Rotary Endodontic Files through Finite Element Simulation: Effect of Root Canal Geometry on Fatigue Life." Journal of Clinical Medicine 10, no. 23 (December 3, 2021): 5692. http://dx.doi.org/10.3390/jcm10235692.
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This article describes a numerical procedure for estimating the fatigue life of NiTi endodontic rotary files. An enhanced finite element model reproducing the interaction of the endodontic file rotating inside the root canal was developed, which includes important phenomena that allowed increasing the degree of realism of the simulation. A method based on the critical plane approach was proposed for extracting significant strain results from finite element analysis, which were used in combination with the Coffin–Manson relation to predict the fatigue life of the NiTi rotary files. The proposed procedure is illustrated with several numerical examples in which different combinations of endodontic rotary files and root canal geometries were investigated. By using these analyses, the effect of the radius of curvature and the angle of curvature of the root canal on the fatigue life of the rotary files was analysed. The results confirm the significant influence of the root canal geometry on the fatigue life of the NiTi rotary files and reveal the higher importance of the radius of curvature with respect to the angle of curvature of the root canal.
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Panda, Anup, Krishna Shah, Varsha Budakoti, Krishna Dere, Mira Virda, and Jina Jani. "Evaluation of microcrack formation during root canal preparation using hand, rotary files and self-adjusting file in primary teeth: An in vitro study." Journal of Dental Research, Dental Clinics, Dental Prospects 15, no. 1 (February 13, 2021): 35–41. http://dx.doi.org/10.34172/joddd.2021.007.
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Background. Pediatric endodontics is a field with constant evolution, resulting in the shifting of paradigms from the use of conventional hand files to rotary files for biomechanical preparation in primary teeth. Biomechanical preparation plays a crucial role in the success of root canal treatment. Primary teeth need special attention since they differ from permanent teeth in root canal morphology. Cleaning and shaping of the canals damage the root dentin, leading to dentinal cracks. Newer techniques for root canal preparation, including Ni-Ti rotary files and SAF system, have been developed for use in pediatric endodontics to overcome the drawbacks of conventional methods. The present study compared dentinal defects formed by rotary systems in primary teeth. Methods. Eighty primary teeth were included. The teeth were decoronated with a diamond disc. All the roots were inspected for any pre-existing cracks or craze lines under transmitted light under a stereomicroscope. The specimens were then divided into four groups (n=20): group 1: control, group 2: hand files (HF), group 3: ProTaper files, and group IV: SAF files. The samples were instrumented according to the group they were assigned to. Results. The HF and SAF groups exhibited fewer microcracks. Dentinal microcracks were observed in roots prepared with rotary ProTaper files. There were significant differences between HF/SAF and rotary files (P<0.05). Conclusion. Stainless steel hand K-files and SAF instruments resulted in fewer dentinal damage than the ProTaper Universal files. SAF exhibited satisfactory results with minimal or no crack formation.
Dissertations / Theses on the topic "Rotary files"
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Suffridge, Calvin Buford. "Cleaning Efficiency of Nickel Titanium GT and .04 Rotary Files when used in a Torque Controlled Rotary Handpiece." VCU Scholars Compass, 2002. https://scholarscompass.vcu.edu/etd/5533.
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This study determined if the cleaning efficiency of NiTi rotary files in an endodontic electric handpiece using a no torque control setting was superior to that obtained when using the torque control feature. Fifty extracted human anterior teeth with straight canals were divided into two groups of 20 and two control groups of 5. Canals were instrumented with GT and .04 Profile NiTi files until a size 35 advanced to working length. Samples were sectioned, the apical 6 mm of the canal was photographed (x20) and projected onto a 3 x 4 foot grid with squares measuring 0.5 inches each. Total debris was the percentage of the number of squares containing debris versus the total number of squares. Results showed that the teeth in the torque controlled group showed an average of 24.99% debris vs. 15.55% for the teeth in the no torque group. The difference was not statistically significant.
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Lloyd, Matthew Warren. "A Comparison of Flexural Fracture of Three Different Nickel-Titanium Rotary File Systems." VCU Scholars Compass, 2007. http://scholarscompass.vcu.edu/etd/708.
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The purpose of this study was to compare the number of rotations to failure of three different rotary file systems. ProFile, Sequence, and Liberator files in sizes 25 and 40 with 0.04 taper were divided into groups of five and rotated against a grooved metal block mounted to a Universal testing machine at 31 and 34 degrees. Each file was rotated at 300 rpm until fracture occurred. The number of rotations to fracture were calculated. Use of a three-way ANOVA and Tukey's HSD multiple comparison tests revealed significant differences for the angle of deflection, size, and type of file. An increased angle of deflection resulted in a decreased number of rotations to failure for all three file types. An increased size of file also resulted in a decreased number of rotations to failure in all the groups. Liberator and Sequence files required fewer rotations to failure than ProFiles in all groups tested except the size 25 files rotated at the less severe angle. ProFiles appear to be more resistant to flexural fracture than Liberator and Sequence files unless the files are of smaller size with a less severe curvature. Care should be taken to limit the number of uses when using larger size files, especially Liberator and Sequence files, around severe curvatures.
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Tomsic, Albert L. "The effect of multiple usages of nickel-titanium rotary endodontic files on cutting efficiency." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10032.
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Thesis (M.S.)--West Virginia University, 2009.Title from document title page. Document formatted into pages; contains viii, 44 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 40-43).
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Yang, Eugenia You Yea. "Comparison of two methodologies for testing cyclic fatigue resistance of nickel-titanium rotary files." Thesis, Boston University, 2015. https://hdl.handle.net/2144/37825.
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Thesis (MSD) --Boston University, Henry M. Goldman School of Dental Medicine, 2015 (Department of Endodontics).Includes bibliography: leaves 69-74.
Nickel titanium (NiTi) rotary files have become an important adjunct to endodontic treatment of the root canal system. However, despite the many advantages, Ni-Ti rotary files have a risk of unexpected fracture without any visible signs of previous permanent deformation. A wide range of methodologies have been developed over the years to test cyclic fatigue; yet to date, there is no specification or international standard for cyclic fatigue testing. The aim of this study was to compare the effect of the stainless steel and the glass tube method on the cyclic fatigue resistance of K3[R], K3xF[R], Vortex[R], Vortex Blue[R], and PROTAPER NEXT[R] NiTi rotary files. Material and Methods: A total of 450 new NiTi rotary fies were tested in this study. These files were divided equally into two groups: one group was subjected to a stainless steel (SS) artificial grooved canal model, and the other group employed the glass tube (GT) model (n=225). Three file sizes, 20.06, 25.06 and 30.06, were selected for the K3[R], K3xF[R], Vortex[R], and Vortex Blue[R] systems; and X1, X2 and X3 was selected from the PROTAPER NEXT[R] system. The files were subjected to an angle of curvature of 60 degrees with a 5mm radius of curvature at 300 rpm for both devices. The number of cycles to failure (NCF) and length of fracture file piece were recorded and statistically analyzed. Results: Significant differences were found between the stainless steel and glass tube testing methodologies; NCF ranged from 325 - 1147 for SS and 412 - 1901 for GT. Both methodologies showed a similar pattern of relationship between file comparisons with the GT method showing greater significant differences among file types. Vortex Blue[R] was the most resistant to cyclic fatigue, and K3[R] system was the least resistant to cyclic fatigue regardless of the testing methodology. The Vortex Blue[R] 20.06 file had the highest cyclic fatigue resistance with a mean NCF of l 147 [plus or minus] 184.3 for SS and 1530.3 [plus or minus] 258 for GT. ProtaperNext[R] X2 (325 [plus or minus] 48.3) and K3[R] 30.06 (412 [plus or minus] 93.4) files had the lowest cyclic fatigue life in the SS and GT method respectively. With the exception of Protaper Next[R], within the same file systems, there is an inverse relationship in regards to tip sizes and number of cycles to failure. Conclusion: The glass tube method is a more accurate measure of cyclic fatigue resistance than the stainless steel method for cyclic fatigue. Vortex Blue[R] and smaller tip sized files performed best in this study.
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Schroeder, Stephen N. "THE INCIDENCE OF ROOT DENTINAL MICRO-CRACKS CAUSED BY RECIPROCATING AND CONTINUOUS ROTARY INSTRUMENTATION." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4587.
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The aim of this study was to compare the incidence of root canal dentinal micro-cracks after canal instrumentation using reciprocating files (WaveOne Gold® and Twisted Adaptive®) and continuous rotation files (Edge Evolve® and EndoSequence®) in an ex-vivo benchtop study. This project used a novel methodology of finding dentinal defects using the “K-cube”, which allows evaluators to visualize sectioned root surfaces before instrumentation and after instrumentation. Mesial roots from 40 human mandibular first molars were divided into 4 groups of 10 for each file type. Root section pictures were taken with a Zeiss Discovery V20 stereomicroscope before and after canal instrumentation. Each of the pre-instrumentation and post-instrumentation images were evaluated for dentinal defects by four calibrated endodontists utilizing REDCap survey. Using a chi-square analysis, there was no statistically significant difference between dentinal defects created by continuous and reciprocating rotation (p=0.1924) and no difference between the four file types (p=0.2317).
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Burke, Thomas. "AN SEM INVESTIGATION INTO THE EFFECTS OF CLINICAL USE ON HEAT-TREATED NICKEL-TITANIUM ROTARY ENDODONTIC FILES." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1470239374.
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Noya, Ares José Antonio. "Comparação de sistemas de instrumentação mecanizada em endodontia." Master's thesis, [s.n.], 2015. http://hdl.handle.net/10284/5144.
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Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina DentáriaCom o aparecimento da liga de Níquel Titânio na Endodontia, foi inevitável a pesquisa de métodos mais rápidos e eficientes para a realização do tratamento endodôntico, tendo como consequência o surgimento de diversos sistemas de instrumentação mecanizada. De facto, estes foram idealizados com o intuito de melhorar, tanto em qualidade como em diminuição de tempo, os sistemas manuais. Esta revisão bibliográfica pretendeu comparar um sistema com movimento contínuo (ProTaper® Universal) com dois sistemas reciprocantes (Reciproc® e WaveOne®) no que se refere a quatro aspetos fundamentais no tratamento endodôntico não cirúrgico: conformação do SCR (sistema de canais radiculares), limpeza do SCR, resistência dos instrumentos usados, e capacidade de desobturação. A recolha de material bibliográfico foi feita recorrendo a motores de busca introduzindo/conjugando as seguintes palavras-chave: “rotary files”, “protaper”, “reciproc”, “waveone”, “canal shaping”, “centering ability”. Foi feita também a consulta de livros em bibliotecas. Mediante o uso de artigos científicos recentes que comparassem, pelo menos, dois dos sistemas indicados anteriormente, chegou-se à conclusão de que os três sistemas são alternativas seguras para a preparação do SCR, apresentando-se mais vantajosos, os sistemas mais recentes Reciproc® e WaveOne®; contudo, nenhum sistema é um substituto absoluto da instrumentação manual. With the onset of Nickel Titanium alloy in Endodontics, the research of faster and more efficient methods for performing endodontic treatment was inevitable, so as a result different mechanized endodontics systems appeared. In fact, these were designed in order to improve both quality and decreased in time compared to manual systems. This literature review intended to compare a system with continuous motion (ProTaper® Universal) and two reciprocating systems (Reciproc® and WaveOne®) in relation to four main aspects in nonsurgical endodontic treatment: cleaning and shaping of the root canal system (SCR), resistance of the instruments used, and removal of filling material. The collection of bibliographic material was done using search engines introducing / combining the following keywords: “rotary files”, “protaper”, “reciproc”, “waveone”, “canal shaping”, “centering ability”. Also books were consulted in libraries. Through the use of recent scientific papers comparing at least two of the systems listed above, we come to the conclusion that the three systems are safe alternatives for the preparation of the SCR, presenting more favorable, the most recent systems Reciproc® and WaveOne®; however, no system is an absolute replacement of manual instrumentation.
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Kitchens, George Gray Jr. "The Effect of Operational Speed on the Fracture of Nickel Titanium Rotary Instruments." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd_retro/66.
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Numerous nickel titanium rotary file systems have been introduced in recent years. The recommended speed at which these files are to be operated varies widely between manufacturers. The purpose of this study was to test the number of rotations to fracture of NiTi rotary files when operated at different speeds and at different angles. Sixty size 25 Profile® nickel titanium rotary files were tested, thirty 0.04 and thirty 0.06 taper. Files were operated at speeds of 350 or 600 rpm and at angles of 25°, 28°, and 33.5°. The time to fracture was recorded and the numbers of rotations to fracture were calculated. The data was analyzed using a two-way ANOVA, and post hoc Tukey-Kramer multiple-comparison test with alpha = .001. The results show a significant difference in the number of rotations fracture according to taper and angle. Files of .06 taper fractured more readily than files of .04 taper as the speed increased, and the time to fracture decreased for both tapers as the angle increased. No significant difference was produced by the speed at which the files were operated. The number of rotations until fracture of NiTi rotary files is not related to the operational speed.
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Wayment, Nathan. "COMPARING CYCLIC FATIGUE OF THE NEW GT® SERIES X(TM) FILES TO THE ENDO SEQUENCE™ ROTARY INSTRUMENTS." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1684.
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The purpose of this study was to examine the number of rotations to failure of two different rotary file systems, EndoSquence Brassler USA (Savannah, GA) and GT(TM) series X(TM). Files sizes 20,30,40 with 0.04, 0.06 tapers of GT series X and Endo Sequence files size and taper used were 20, 30, 40 with 0.04 and 0.06 taper. Like tip and tapers were compared between systems. All files tested were 25mm in length. Files were allocated into 12 groups of 10 files each, and mounted to a universal testing machine. Each file was rotated at 300 rpms until fractured occurred. The number of rotations to fracture were calculated. A two-way ANOVA indicated that each of the 12 groups were significantly different (p < .0001). The Brand Tip/Taper interaction indicated that the differences between the brands varied by Tip/Taper combination (p < .0001). The tip/taper combination 20/.04, the GT series X file rotated 1.4 times longer than the EndoSequence (p = 0.0027). The tip/taper combination 20/.06, the GT series X file rotated 1.61 times longer than the EndoSequence (p = <.0001). The tip/taper combination 30/.04, the GT series X file rotated 3.67 times longer, than the EndoSequence (p = <.0001). For the tip/taper combination 30/.06, the GT series X file rotated 2.63 times longer than the EndoSequence (p = <.0001). For the tip/taper combination 40/.06, the GT series X file rotated 4.05 times longer than the EndoSequence (p = <.0001). In comparing all these tip and taper combinations GT series X was significantly higher rotations to failure. Comparing tip/taper combination 40/.04, the GT series X file rotated 1.22 times longer, however, this was not significantly different than the Sequence (p = 0.0707). The results suggested that the number of rotations to failure for GT series X files were greater than the EndoSequence file of the same tip and taper combination.
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Bang-Schaefer, Katrina H. "The Effect of Sodium Hypochlorite on Nickel Titanium Rotary Instruments and its Effect on Resistance to Fracture." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd_retro/75.
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The purpose of this study was to examine the effect of immersion in sodium hypochlorite on nickel titanium rotary files and determine whether resistance to fracture was influenced by the immersion time. 70 ISO size 25 0.04 taper nickel titanium K3 and Profile rotary instruments were immersed in 5.25% sodium hypochlorite for 1, 5, 15, 30, 60, and 120 minutes (n=5 each). Resistance to fracture was tested by rotating files at a 30 degree angle at 350 rpm in a universal testing machine. Time to fracture was recorded and analyzed by a two-way ANOVA. Within both file types, there was a decreased time to fracture with increased immersion time in sodium hypochlorite. K3 files required an average of 327 rotations to fracture, while Profiles required 420 rotations to fracture. Profiles required significantly more rotations to failure than K3 files.
Books on the topic "Rotary files"
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Brewe, David E. Elasticity effects on cavitation in a squeeze film damper undergoing noncentered circular whirl. [Cleveland, Ohio: NASA Lewis Research Center, 1988.
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Alfred, Rotert, Nöring Hermann, and Sausmikat Ralf, eds. The future lasts longer than the past: European Media Art Festival, Osnabrueck / [Herausgeber, Alfred Rotert, Hermann Nöring, Ralf Sausmikat]. Osnabrück: European Media Art Festival, 2009.
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Hafezi, Ashkan. Examination and comparison of torsional fatigue profiles of rotary nickel-titanium files of varying size and design. 2005.
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Engelke, Henning, Ralf Michael Fischer, and Regine Prange, eds. Film als Raumkunst. Schüren Verlag, 2012. http://dx.doi.org/10.5771/9783741000317.
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Die Auseinandersetzung mit filmischer Raumkonstruktion zieht sich wie ein roter Faden durch die Theoriegeschichte des Films. Bereits 1916 entwarf Hugo Münsterberg ein Modell filmischer Darstellungsformen in räumlichen Begriffen. Von den klassischen Filmtheorien Rudolf Arnheims, Béla Balázs’, André Bazins oder Siegfried Kracauers, über die semiotisch-psychoanalytischsche Ideologiekritik der 1970er-Jahre bis hin zu phänomenologischen Ansätzen oder Gilles Deleuzes philosophischer Kinotheorie bildete der Raum einen zentralen Aspekt filmtheoretischer Diskurse.
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San, Andres Luis, and United States. National Aeronautics and Space Administration., eds. Thermohydrodynamic analysis of cryogenic liquid turbulent flow fluid film bearings (phase II): 1994 annual research progress report to NASA lewis research center. [Washington, DC: National Aeronautics and Space Administration, 1994.
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San, Andres Luis, and United States. National Aeronautics and Space Administration., eds. Thermohydrodynamic analysis of cryogenic liquid turbulent flow fluid film bearings (phase II): 1994 annual research progress report to NASA lewis research center. [Washington, DC: National Aeronautics and Space Administration, 1994.
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7
Marques, Marcia Alessandra Arantes, ed. Pesquisa em Engenharia: Ciência e Aplicação. Bookerfield Editora, 2022. http://dx.doi.org/10.53268/bkf22040200.
Full textAbstract:
Neste livro são apresentados resultados de trabalhos científicos aplicados à grande área de Engenharia. De abordagem objetiva, a obra se mostra de grande relevância para graduandos, alunos de pós-graduação, docentes e profissionais. Os capítulos estão agrupados em duas seções: i) materiais; ii) águas continentais e oceânicas. Pelo capítulo um é apresentado o desenvolvimento de uma metodologia para obter-se reprodutibilidade da área superficial de um eletrodo de estanho durante o estudo do crescimento de óxidos de estanho. A reprodutibilidade da área superficial pode ser comprovada pela reprodutibilidade das densidades de carga anódicas dos voltamogramas anódicos a 50 mVs-1 posteriores a cada tratamento. Por meio do capítulo dois é analisada a substituição de parte do carvão mineral, utilizado em siderúrgicas, por biomassa. Entre os grandes desafios do setor estão a produção de aço a preços competitivos e a substituição de parte do carvão mineral utilizado por biomassa. A biomassa é considera neutra em emissões de CO2, devido a captura do mesmo durante o processo de fotossíntese, o que a torna atraente para seu uso nos processos siderúrgicos. Além disso, o seu uso pode gerar redução de custos, principalmente se for considerado os rejeitos do agronegócio que não possuem um alto valor agregado. Neste contexto, por este capítulo serão mostradas algumas possíveis utilizações de biomassa nos processos siderúrgicos através de estudos que vem sendo realizado no tema e aplicações na indústria. Será possível notar que o uso de biomassa é uma alternativa viável a curto prazo para atender as crescentes restrições ambientais atuais. Através do capítulo três é analisado o crescimento voltamétrico de óxido de estanho em solução tampão fosfato, pH 8,7. Medidas elipsométricas ex-situ foram realizadas para determinar a espessura dos óxidos crescidos. A partir desses resultados, o volume do filme por unidade de carga, Vf, foi calculado para diferentes densidades de carga. As medidas elipsométricas mostram que filmes de óxido de estanho crescidos a 2 mVs-1 são menos densos para valores de espessura 3,37 nm, tendo Vf próximo a 1,70 x 10-4 cm3C-1. Para valores mais altos de espessura (11,0 – 12,4 nm) os filmes se tornam mais densos tendo Vf próximo a 0,5 x 10-4 cm3C-1. No caso de 100 mVs-1 os filmes apresentam o mesmo comportamento, tendo Vf próximo de 3,74 x 10-4 cm3.C-1 para espessura de 4,56 nm e Vf próximo de 1,32 x 10-4 cm3.C-1 para espessura de 7,42 nm. Imagens de Microscopia de Força Atômica mostraram que a morfologia muda e a rugosidade dos filmes aumenta com o aumento da espessura e do potencial final da voltametria. O capítulo quatro trata do Nitreto cúbico de boro (cBN), material imprescindível para usinagem com alta precisão e alta velocidade de APRESENTAÇÃO materiais ferrosos como aço. O cBN é recomendado para trabalhos sob condições severas, tais como corte intermitente, em que dureza deve estar associada com tenacidade para evitar a quebra. Na síntese do cBN, são aplicados, basicamente, dois tipos de catalisadores: nitreto de magnésio e magnésio. Cada qual oferece diferentes possibilidades, tais como maiores valores de profundidade de corte ou menor nível de rugosidade superficial. Este capítulo contribui para uma melhor compreensão da manipulação dos parâmetros aplicados no regime de síntese deste elemento e, favorecendo o desenvolvimento da tecnologia de sua produção. Por meio do capítulo cinco é avaliada a aplicação de separação magnética de alta intensidade no beneficiamento de itabiritos pobres. Na rota de processo avaliada (separação magnética + flotação), a etapa de separação magnética executa a função de pré-concentração e deslamagem. O teor de SiO2 no concentrado foi de 1,46% (menor que o teor objetivo de 2,00%). As recuperações mássica e metalúrgica obtidas com a rota separação magnética + flotação foram maiores em termos absolutos 3,3% e 4,4%, respectivamente. Através do capítulo seis é realizada a otimização de injeção de poliamida PA66 com 50% GF usando o método Taguchi. O estudo se justifica pela necessidade crescente de materiais mais leves e de maior produtividade em substituição às ligas metálicas, o que demanda o constante desenvolvimento de compósitos poliméricos e eficazes processos de fabricação. Como resposta do estudo, mediu-se a resistência máxima de tração (RTmáx), numa poliamida 66 com carga de 50% de fibra de vidro, Grivory GV-5H®. Fez-se uso da metodologia ANOVA para indentificar-se os fatores de maior significância para o processo. A melhor resistência máxima de tração obtida de 242,6 N/m2, mostrou-se como uma opção na substituição à aplicações de ligas metálicas de alumínio. A melhor resultado se obteve com a temperatura de processamento em 270°C, o fluxo volumétrico de 83 cm³/s, a pressão de recalque de 300 bar, a contrapressão de 10 bar, velocidade da rosca de 50 min-1 e o tempo de recalque com valor de 5 s. As porcentagens de contribuição encontradas foram pressão de recalque com contribuição de 61%, seguido da temperatura de processamento, com contribuição de 17% e em terceiro, o fluxo volumétrico com contribuição de 12%. A instalação de grandes equipamentos submarinos em águas profundas apresenta uma série de desafios. O capítulo sete trata da análise de estabilidade hidrodinâmica de Manifolds submarinos durante a instalação pelo método pendular. O presente capítulo racionaliza tal método e, além disso, considera sistemas para evitar o capotamento, durante um momento crítico do método que é o início da descida, apresentando uma modelagem matemática fenomenológica a partir de casos similares. A etapa de validação foi realizada pela análise comparativa entre a modelagem proposta e resultados de testes experimentais realizados com modelos físicos. Com a confirmação da aderência dos resultados numéricos com os experimentos, esta abordagem se confirma como uma ferramenta de engenharia para dimensionamento dos equipamentos submarinos instalados pelo Método Pendular para que sejam direcionalmente estáveis. Por meio do capítulo oito são apresentados os resultados da simulação da distribuição espacial das ondas geradas pela ação de ventos severos sobre o reservatório da barragem de Salto Caxias, no rio Iguaçu, estado do Paraná. Os ventos severos foram estimados através da análise de frequência regional para várias estações anemométricas do Instituto Meteorológico do Paraná (SIMEPAR) para o período de 1998 a 2005. As alturas de ondas foram estimadas pelo método paramétrico SMB, que usa como dados de entrada o fetch e a velocidade do vento. O método SMB foi aplicado pelo modelo computacional ONDACAD. Os testes estatísticos indicaram que a distribuição de Wakeby foi a mais robusta para as séries curtas de ventos horários máximos anuais, produzindo estimativas de ventos severos que variaram entre 25,7 ms-1 (tempo de retorno de Tr=10 anos) a 50,9 ms-1 (Tr=100 anos). O estudo presta grande contribuição à compreensão da quantificação das alturas de ondas geradas por ventos severos neste importante reservatório do estado do Paraná. Pelo capítulo nove é apresentada uma análise comparativa bidimensional entre alturas de ondas resultantes da aplicação dos modelos paramétricos MARQUES e JONSWAP ao reservatório da Usina Hidrelétrica de Itaipu Binacional, localizado no Rio Paraná entre o Brasil e o Paraguai. Os campos de vento uniforme relacionados a períodos de recorrência de 10, 20, 50 e 100 anos foram obtidos pelos registros realizados pelo Sistema Meteorológico do Paraná (SIMEPAR). Através da utilização do modelo ONDACAD foram determinados os campos de fetch e a transformação em campos de ondas pela utilização dos modelos paramétricos MARQUES e JONSWAP. Ao proceder a análise constatou-se que, ao majorar os resultados do modelo JONSWAP em 78% chega-se aos resultados bidimensionais gerados pelo modelo Marques. Esta condição foi verificada para situações de ventos extremos, ou seja, superiores a 20ms-1 e corpos hídricos que possuem fetch máximo da ordem de 10 quilômetros. O estudo contribui para a compreensão da distribuição das magnitudes das alturas de ondas neste reservatório de grande importância no âmbito da América do Sul, de grande utilidade para estudos relacionados, por exemplo, a erosões marginais, ecossistemas aquáticos continentais, psicultura por tanques-rede, quantificação de gases de efeito estufa devido à ressuspensão de sedimentos devido a propagação de ondas.
8
Marques, Marcia Alessandra Arantes, ed. Pesquisa em Engenharia: Ciência e Aplicação. Bookerfield Editora, 2022. http://dx.doi.org/10.53268/bkf22040200.
Full textAbstract:
Neste livro são apresentados resultados de trabalhos científicos aplicados à grande área de Engenharia. De abordagem objetiva, a obra se mostra de grande relevância para graduandos, alunos de pós-graduação, docentes e profissionais. Os capítulos estão agrupados em duas seções: i) materiais; ii) águas continentais e oceânicas. Pelo capítulo um é apresentado o desenvolvimento de uma metodologia para obter-se reprodutibilidade da área superficial de um eletrodo de estanho durante o estudo do crescimento de óxidos de estanho. A reprodutibilidade da área superficial pode ser comprovada pela reprodutibilidade das densidades de carga anódicas dos voltamogramas anódicos a 50 mVs-1 posteriores a cada tratamento. Por meio do capítulo dois é analisada a substituição de parte do carvão mineral, utilizado em siderúrgicas, por biomassa. Entre os grandes desafios do setor estão a produção de aço a preços competitivos e a substituição de parte do carvão mineral utilizado por biomassa. A biomassa é considera neutra em emissões de CO2, devido a captura do mesmo durante o processo de fotossíntese, o que a torna atraente para seu uso nos processos siderúrgicos. Além disso, o seu uso pode gerar redução de custos, principalmente se for considerado os rejeitos do agronegócio que não possuem um alto valor agregado. Neste contexto, por este capítulo serão mostradas algumas possíveis utilizações de biomassa nos processos siderúrgicos através de estudos que vem sendo realizado no tema e aplicações na indústria. Será possível notar que o uso de biomassa é uma alternativa viável a curto prazo para atender as crescentes restrições ambientais atuais. Através do capítulo três é analisado o crescimento voltamétrico de óxido de estanho em solução tampão fosfato, pH 8,7. Medidas elipsométricas ex-situ foram realizadas para determinar a espessura dos óxidos crescidos. A partir desses resultados, o volume do filme por unidade de carga, Vf, foi calculado para diferentes densidades de carga. As medidas elipsométricas mostram que filmes de óxido de estanho crescidos a 2 mVs-1 são menos densos para valores de espessura 3,37 nm, tendo Vf próximo a 1,70 x 10-4 cm3C-1. Para valores mais altos de espessura (11,0 – 12,4 nm) os filmes se tornam mais densos tendo Vf próximo a 0,5 x 10-4 cm3C-1. No caso de 100 mVs-1 os filmes apresentam o mesmo comportamento, tendo Vf próximo de 3,74 x 10-4 cm3.C-1 para espessura de 4,56 nm e Vf próximo de 1,32 x 10-4 cm3.C-1 para espessura de 7,42 nm. Imagens de Microscopia de Força Atômica mostraram que a morfologia muda e a rugosidade dos filmes aumenta com o aumento da espessura e do potencial final da voltametria. O capítulo quatro trata do Nitreto cúbico de boro (cBN), material imprescindível para usinagem com alta precisão e alta velocidade de APRESENTAÇÃO materiais ferrosos como aço. O cBN é recomendado para trabalhos sob condições severas, tais como corte intermitente, em que dureza deve estar associada com tenacidade para evitar a quebra. Na síntese do cBN, são aplicados, basicamente, dois tipos de catalisadores: nitreto de magnésio e magnésio. Cada qual oferece diferentes possibilidades, tais como maiores valores de profundidade de corte ou menor nível de rugosidade superficial. Este capítulo contribui para uma melhor compreensão da manipulação dos parâmetros aplicados no regime de síntese deste elemento e, favorecendo o desenvolvimento da tecnologia de sua produção. Por meio do capítulo cinco é avaliada a aplicação de separação magnética de alta intensidade no beneficiamento de itabiritos pobres. Na rota de processo avaliada (separação magnética + flotação), a etapa de separação magnética executa a função de pré-concentração e deslamagem. O teor de SiO2 no concentrado foi de 1,46% (menor que o teor objetivo de 2,00%). As recuperações mássica e metalúrgica obtidas com a rota separação magnética + flotação foram maiores em termos absolutos 3,3% e 4,4%, respectivamente. Através do capítulo seis é realizada a otimização de injeção de poliamida PA66 com 50% GF usando o método Taguchi. O estudo se justifica pela necessidade crescente de materiais mais leves e de maior produtividade em substituição às ligas metálicas, o que demanda o constante desenvolvimento de compósitos poliméricos e eficazes processos de fabricação. Como resposta do estudo, mediu-se a resistência máxima de tração (RTmáx), numa poliamida 66 com carga de 50% de fibra de vidro, Grivory GV-5H®. Fez-se uso da metodologia ANOVA para indentificar-se os fatores de maior significância para o processo. A melhor resistência máxima de tração obtida de 242,6 N/m2, mostrou-se como uma opção na substituição à aplicações de ligas metálicas de alumínio. A melhor resultado se obteve com a temperatura de processamento em 270°C, o fluxo volumétrico de 83 cm³/s, a pressão de recalque de 300 bar, a contrapressão de 10 bar, velocidade da rosca de 50 min-1 e o tempo de recalque com valor de 5 s. As porcentagens de contribuição encontradas foram pressão de recalque com contribuição de 61%, seguido da temperatura de processamento, com contribuição de 17% e em terceiro, o fluxo volumétrico com contribuição de 12%. A instalação de grandes equipamentos submarinos em águas profundas apresenta uma série de desafios. O capítulo sete trata da análise de estabilidade hidrodinâmica de Manifolds submarinos durante a instalação pelo método pendular. O presente capítulo racionaliza tal método e, além disso, considera sistemas para evitar o capotamento, durante um momento crítico do método que é o início da descida, apresentando uma modelagem matemática fenomenológica a partir de casos similares. A etapa de validação foi realizada pela análise comparativa entre a modelagem proposta e resultados de testes experimentais realizados com modelos físicos. Com a confirmação da aderência dos resultados numéricos com os experimentos, esta abordagem se confirma como uma ferramenta de engenharia para dimensionamento dos equipamentos submarinos instalados pelo Método Pendular para que sejam direcionalmente estáveis. Por meio do capítulo oito são apresentados os resultados da simulação da distribuição espacial das ondas geradas pela ação de ventos severos sobre o reservatório da barragem de Salto Caxias, no rio Iguaçu, estado do Paraná. Os ventos severos foram estimados através da análise de frequência regional para várias estações anemométricas do Instituto Meteorológico do Paraná (SIMEPAR) para o período de 1998 a 2005. As alturas de ondas foram estimadas pelo método paramétrico SMB, que usa como dados de entrada o fetch e a velocidade do vento. O método SMB foi aplicado pelo modelo computacional ONDACAD. Os testes estatísticos indicaram que a distribuição de Wakeby foi a mais robusta para as séries curtas de ventos horários máximos anuais, produzindo estimativas de ventos severos que variaram entre 25,7 ms-1 (tempo de retorno de Tr=10 anos) a 50,9 ms-1 (Tr=100 anos). O estudo presta grande contribuição à compreensão da quantificação das alturas de ondas geradas por ventos severos neste importante reservatório do estado do Paraná. Pelo capítulo nove é apresentada uma análise comparativa bidimensional entre alturas de ondas resultantes da aplicação dos modelos paramétricos MARQUES e JONSWAP ao reservatório da Usina Hidrelétrica de Itaipu Binacional, localizado no Rio Paraná entre o Brasil e o Paraguai. Os campos de vento uniforme relacionados a períodos de recorrência de 10, 20, 50 e 100 anos foram obtidos pelos registros realizados pelo Sistema Meteorológico do Paraná (SIMEPAR). Através da utilização do modelo ONDACAD foram determinados os campos de fetch e a transformação em campos de ondas pela utilização dos modelos paramétricos MARQUES e JONSWAP. Ao proceder a análise constatou-se que, ao majorar os resultados do modelo JONSWAP em 78% chega-se aos resultados bidimensionais gerados pelo modelo Marques. Esta condição foi verificada para situações de ventos extremos, ou seja, superiores a 20ms-1 e corpos hídricos que possuem fetch máximo da ordem de 10 quilômetros. O estudo contribui para a compreensão da distribuição das magnitudes das alturas de ondas neste reservatório de grande importância no âmbito da América do Sul, de grande utilidade para estudos relacionados, por exemplo, a erosões marginais, ecossistemas aquáticos continentais, psicultura por tanques-rede, quantificação de gases de efeito estufa devido à ressuspensão de sedimentos devido a propagação de ondas.
Book chapters on the topic "Rotary files"
1
Poll, G., A. Gabelli, P. G. Binnington, and J. Qu. "Dynamic Mapping of Rotary Lip Seal Lubricant Films by Fluorescent Image Processing." In Fluid Sealing, 55–77. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2412-6_5.
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2
Medvedovski, E., C. J. Szepesi, O. Yankov, and P. Lippens. "Indium Tin Oxide Nanosized Transparent Conductive Thin Films Obtained by Sputtering from Large Size Planar and Rotary Targets." In Ceramic Transactions Series, 125–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470931011.ch12.
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3
S, Dr Divya Priyal, Dr Daya Srinivasan, and Dr Senthil Eagappan. "SELF ADJUSTING FILES IN PEDIATRIC DENTISTRY – A REVIEW." In Emerging Trends in Oral Health Sciences and Dentistry. Technoarete Publishers, 2022. http://dx.doi.org/10.36647/etohsd/2022.01.b1.ch013.
Full textAbstract:
Deciduous tooth is of great significance as it maintains the space for permanent dentition. Conventional pulpectomy procedure is performed with stainless steel hand files. The rigid nature of these files may cause bizarre canal shapes. The time taken during biomechanical preparation may lead to further worsening of the patient's cooperation, especially in Pediatric Endodontics. Though rotary file system has several advantages, it fails to clean the curved and oval shaped canals efficiently. The Self-Adjusting File (SAF) introduces a new era in Pediatric Endodontics by performing the conventional steps of shaping and cleaning at the same time. The SAF is a cylindrical hollow file that adjusts to the root canal in three dimensions and is a solitary file system formed of Ni-Ti matrix. The SAF is under continual irrigation through an irrigation device and works in an in-and-out vibration propelled by a handpiece. The SAF system has retained the original contour of the canals without dentinal cracks in primary teeth. The aim of this review is to describe design of the SAF, operational parameters and features, and advantages of SAF over other file systems in Pediatric Endodontics.
4
Vengidesh, Ramya, Anupama Ramachandran, and Sadasiva Kadandale. "METHODS TO RETRIEVE SEPARATED INSTRUMENTS IN ENDODONTICS." In Emerging Trends in Oral Health Sciences and Dentistry. Technoarete Publishers, 2022. http://dx.doi.org/10.36647/etohsd/2022.01.b1.ch005.
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During the root canal procedure, an instrument can fracture occasionally which might block access to the apical terminus (1). The instrument may be a hand or a rotary file, Peaso reamer, Gates Glidden drill, Lentulo spiral, or some non-endodontic instruments (1,2). The hand instruments have a separation rate of 0.25% (3) whereas for rotary instruments it ranges between 1.68% and 2.4% (3,4), for stainless steel instruments it is between 0.25% and 6%, and for Ni-Ti instruments, it ranges from 1.3% to 10% (5-15). The reason for the separation of an endodontic instrument may be the presence of a curved canal, overusing the same file, loss of tactile sensation, over instrumentation, etc (16). When separation occurs every clinician has the choice of whether to 1. Leave the instrument in the root canal, 2. Bypass the instrument, 3. Retrieve the separated instrument by surgical or non-surgical methods. Leaving the separated instrument in the canal is not always preferable because it may affect the outcome of root canal therapy (17). So, attempts should be made to either bypass or retrieve the instrument. The success of fractured instrument retrieval mainly depends on the anatomy of the root canal, the fragment location, its length, the curvature, and the diameter of the root canal (18). This review mainly describes the recent trends in retrieving the separated endodontic and non-endodontic instruments.
5
Yao, Shuyan, Bo Wu, Qiang Liu, and Kang Xu. "Structure Optimization of Magnetic Levitation Motor Rotor." In Fuzzy Systems and Data Mining VI. IOS Press, 2020. http://dx.doi.org/10.3233/faia200682.
Full textAbstract:
With the development of science and technology, magnetic suspension products are gradually favored by people for the characteristics of no friction and wear, no lubrication and long life. With the increasing consumption of fossil energy, magnetic levitation green energy-saving equipment is gradually studied by researchers. Taking magnetic suspension flywheel (MSMFW) as typical representative, magnetic suspension products in aerospace field have been greatly developed. As the core component of magnetic suspension flywheel, magnetic levitation motor has been widely studied. To obtain the better performance of magnetic levitation motor when it was used in magnetic suspended momentum flywheel, the motor rotor system structure was optimized in this paper. Firstly, the rotor system moment of inertia was calculated and analyzed, and the optimum ratio of polar moment of inertia to equatorial moment of inertia was obtained. Then the basic structure of motor rotor was designed on the basis of the rotor system dynamic analysis. Thirdly, based on the flywheel motor system model, the ANSYS Parametric Design Language (APDL) file was established, and it was applied to optimization software ISIGHT to complete the optimization. In the optimization process, the design variables boundary conditions were given, and the Sequence Quadratic Programming method was used for maintaining the optimization process and the optimization convergence results was obtained. The magnetic flux density as the optimization objective is increased from 0.393 T to 0.53 T through the optimization, which is 34.9% larger than before. It is of great significance for the magnetic levitation motor design, and the engineering application of magnetic levitation motor based on optimization results will be done in the future.
6
Decker, Todd. "Helicopter Music." In Hymns for the Fallen. University of California Press, 2017. http://dx.doi.org/10.1525/california/9780520282322.003.0008.
Full textAbstract:
This chapter considers the sonic representation of the helicopter in combat films set in Vietnam and the Greater Middle East. The sound of unseen helicopters has frequently been used as a kind of effects-made music underlining tense narrative moments or dialogue. The sound of helicopter rotors in scenes set on or near helicopters has often been modulated (lowered in volume) or replaced entirely by music. Special attention is given to scenes of soldiers inside helicopters riding into battle and to how music has been used to shape the cinematic experience of helicopter-borne battle. Film form often follows musical form when helos take to the skies on-screen. The helicopter attack on a Vietnamese village to the supposedly diegetic sound of Richard Wagner’s “Ride of the Valkyries” in Apocalypse Now is analyzed in detail. The editor Walter Murch built the sequence on Wagner’s musical form, expressing an equivalence between musical pleasure and the pleasures of firing weapons.
7
Sugimoto, Masanori. "Projected Displays of Mobile Devices for Collaboration." In Handbook of Research on User Interface Design and Evaluation for Mobile Technology, 594–607. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-871-0.ch035.
Full textAbstract:
Mobile devices have so far been personal tools. With their evolution of increased functionality, however, these devices have begun to be used in a shared fashion by multiple people. This chapter discusses techniques allowing multiple people to share mobile devices by projecting their displays and conducting intuitive manipulations on them. The chapter first shows overviews of systems and technologies related to location-aware projection and several interaction techniques. Then, a system called Hotaru that implements intuitive manipulation techniques on projected displays of multiple mobile devices is described. Hotaru allows a user to annotate or rotate a picture or a document on a projected display by using his finger and intuitively to transfer a file between multiple devices by overlapping their projected displays. User studies of Hotaru indicated that the proposed manipulation techniques could support multiple people in a single location in conducting their tasks. Research issues on projected displays of mobile devices are raised.
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Danos, J. C., B. Tournerie, and J. Frêne. "Notched Rotor Face Effects on Thermohydrodynamic Lubrication in Mechanical Face Seal." In Thinning Films and Tribological Interfaces, Proceedings of the 26th Leeds-Lyon Symposium on Tribology, 251–59. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-8922(00)80130-3.
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Ciller, Carmen. "The influence of Argentinian acting schools in Spain from the 1980s." In Performance and Spanish Film. Manchester University Press, 2016. http://dx.doi.org/10.7228/manchester/9780719097720.003.0007.
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This chapter analyses the legacy of Argentinean performers and acting schools in contemporary Spanish cinema. It begins by studying how different waves of migration between Spain and Argentina resulted in rich collaborations, both in terms of industry and familial bonds (which favoured the appearance and continuation of families of actors such as the Alterios and Diosdados). The arrival of these Argentinean actors and actresses during the Transition to democracy contributed to the disappearance of traditional acting styles in Spanish cinema and promoted innovative modes and methods of performance. Thus, this chapter shows that the generation led by Cecilia Roth provided Spanish cinema with new ways of representing the body and performing femininity and sexual freedom, in films as influential as Iván Zulueta's Arrebato/Rapture (1979). The chapter concludes with a discussion on how the proliferation of Argentinean schools of acting, such as those of Cristina Rota and Juan Carlos Corazza, has contributed greatly to the success of recent generations of actors such as Penélope Cruz and Javier Bardem.
Conference papers on the topic "Rotary files"
1
Fan, Hua-Tzu, Harry Kuo, and Joseph Simmer. "Measuring Paint Droplet Size, Velocity, and Charge-to-Mass Ratio Distribution for Electrostatic Rotary Bell Spray Simulation." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63556.
Full textAbstract:
High-speed electrostatic rotary bells are widely used in the automotive industry as they provide high quality paint films with better transfer efficiency compared to air-atomizing guns. However, due to its highly turbulent spray pattern, transfer efficiency is still not ideal, i.e. some portion of paint will not reach intended target surfaces and becomes overspray. Numerical simulation of the electrostatic spraying process provides a tool to model this process as well as a way to optimize transfer efficiency. Currently, the state-of-the-art simulation model can simulate the flying trajectories of paint droplets from the edge of the rotating bell cup to the target surfaces. It requires some input information to start the simulation. The input information includes paint droplet size, velocity, and charge-to-mass ratio. Due to its large number of droplets, distributions based on droplet diameters are used to represent the entire droplet population. This paper describes experimental and mathematical methods to measure and calculate paint droplet size, velocity, and charge-to-mass ratio distributions. The resulting information can then be organized and used as the input data files for Electrostatic spray painting simulation.
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Garipov, Andrey Vyacheslavovich, Andrey Aleksandrovich Rebrikov, Aydar Ramilevich Galimkhanov, Andrey Valerievich Mikhaylov, Almaz Sadrikhanovich Khalilov, Denis Sergeevich Kochetkov, Dmitry Yurievich Tur, et al. "Efficient PDC Bit Designs Reduced Vibrational Impact While Drilling with Rotary Steerable Systems in the Geological Conditions of the Yamalo-Nenets Autonomous District." In SPE Russian Petroleum Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/206460-ms.
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Abstract This article is a description of a comprehensive engineering approach to new designs of PDC (Polycrystalline Diamond Compact) Bits and bottomhole equipment for efficient horizontal wells drilling in the Yamal-Nenets Autonomous Okrug (YNAO) fields with Rotary Steerable Systems (RSS) Point the Bit (PTB) type. The paper represents an analysis of the efficiency of drilling rocks of various hardness depending on the bits, the bottom hole assembly (BHA), and type of vibrations. In the Yamal region fields a main constraint of sub horizontal sections drilling performance for liner run in hole is the occurrence of vibrations. The predominant vibration types are Stick and Slip (S&S) and High Frequency Torsional Oscillations (HFTO). These types of vibrations often had to be reduced by limiting drilling regime (weight on bit (WOB), drill pipe (DP) RPM, and flow rate), which directly affected on the rate of penetration (ROP). To find solutions to this problem for drilling performance improvement, geological and geomechanically modeling of rock properties and an analysis of burst-files of vibrations (modeled in specialized software) were carried out based on downhole data. The studies have found key factors that cause the high vibration impact and reasons for premature wear of the PDC bits, which served as a basis for identifying the shortcomings of previous bit designs. Test beam experiments were also performed to assess the bits wear while drill-out of the casing accessories. The results formed the basis for development of new PDC bits designs using specialized software. As an output new 155.6/152.4 mm bits designs with an innovative cutting structure that considers the geological features and technical aspects of drilling liner sections in YNAO fields were manufactured. The new bit designs have significantly reduced vibration levels, improved ROP performance in the liner section using RSS PTB, and decreased the overall well construction time. These solutions open wide opportunities for their further implementation on other projects both in Russia and in other CIS countries.
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Kochanneck, Leif, Andreas Tewes, Gerd-Albert Hoffmann, Kalle Niiranen, John Rönn, Sami Sneck, Andreas Wienke, and Detlev Ristau. "Enabling rotary Atomic Layer Deposition for optical applications." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/oic.2022.tc.1.
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Ta2O5 and SiO2 films coated by rotary atomic layer deposition were studied. Investigations proved low absorption 3.1 ppm, respectively 6.0 ppm as well as uniformity 1.55 % and 2.71 % for growth rates up to 0.18 nm/sec. (e-mail: l.kochanneck@lzh.de).
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Ota, Masahiro, Yu-ichi Watanabe, and Moriyoshi Sakamoto. "Laser Opto Microactuators Rotated by Molecular Gas Dynamics Effects." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0298.
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Abstract In this paper, a selective optical absorber plate and an anodic oxidation alumina are proposed for the rotor of an opto microactuator used as an actuator in a micromachine. The thin films of the selective optical absorber plate are fabricated by vacuum deposition. The substrates used are pyrex glass at the first stage and aluminum at the second stage. Deposition on the pyrex glass substrates is carried out in order to estimate the deposition rate and determine the characteristics of the deposited films. Germanium and silicon oxide are selected as the materials for the selective optical absorber thin films. Germanium is used as to absorb the visible beam from a laser generator. In contrast, silicon oxide is used because it has a small reflectance for visible light. The selective optical absorber-plates for the rotors of the opto microactuator consist of aluminum substrates on which germanium thin films and silicon oxide thin films are deposited. A germanium film is deposited on an aluminum substrate first and then a silicon film is deposited on the germanium film. Therefore, the rotor surface has a small reflectance for visible light and a large reflectance for infrared light. The surface with the deposited films is called the front surface and the opposite surface is called a rear surface. The rear surface is an aluminum plate with the anodic oxidation alumina film for low heat conductivity, large emissivity and thermal insulation. The insulated rotors can keep the temperature difference by greater than 10 Kelvin, even if the irradiation times are longer than 200 seconds. There are 3 reasons why the insulating rotor can keep the temperature difference. They are occurrence of a contact resistance, an increase of a surface area and a small heat conductivity of anodic oxidation alumina.
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Nakhjavani, Reza, and Jianwen Zhu. "Rotary Register File: A Micro-Architectural Primitive on FPGA." In 2020 IEEE 28th Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM). IEEE, 2020. http://dx.doi.org/10.1109/fccm48280.2020.00060.
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Michael, Paul W., Jeffrey M. Guevremont, Mark T. Devlin, and Charles G. Ziemer. "Tribological Film Formation in Hydraulic Motors." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61029.
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This paper presents an investigation of the tribological films formed in hydraulic motors. Hydraulic motors convert the fluid power energy produced by positive displacement pumps into rotary motion. Earlier research found that the efficiency of this energy transformation can be enhanced by reducing boundary friction. In order to study the nature of the boundary films formed in an orbital motor, a prototype ashless hydraulic fluid was evaluated in a low-speed high-torque dynamometer. The resulting tribofilm was probed via Energy Dispersive X-Ray Spectroscopy. The results reveal that increasing the hydraulic system temperature raised the relative phosphorus level of the tribofilm.
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Brown, R. D., and G. Drummond. "Chaos of a Flexible Rotor in Journal Bearings." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0529.
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Abstract Nonlinear systems can give rise to chaotic behaviour, essentially unpredictable. Oil film forces arising from hydrodynamic bearings in rotating machinery can be extremely nonlinear under conditions of large unbalance. Chaotic response has been demonstrated in theoretical models of rigid rotors supported in hydrodynamic bearings. The behaviour of a rigid rotor can be extended by looking at a flexible rotor model supported on journal bearings and subject to large unbalance levels. The introduction of a flexible shaft yields chaotic regions which are less extensive than those obtained from a rigid rotor model. This is not surprising as the nonlinearity in the model is confined to the oil films at the end of the shaft. However if this level of unbalance is experienced in service then shaft fatigue could occur because of the sustained nature of the non-synchronous response and the effect of the resulting stress reversals.
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Zhang, Zexuan, and Ting Wang. "Investigation of Combustion and Thermal-Flow Inside a Petroleum Coke Rotary Calcining Kiln With Potential Energy Saving Considerations." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64643.
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Calcined coke is a competitive material for making carbon anodes for smelting of alumina to aluminum. Calcining is an energy intensive industry and a significant amount of heat is exhausted in the calcining process. Efficiently managing this energy resource is tied to the profit margin and survivability of a calcining plant. To help improve the energy efficiency and reduce natural gas consumption of the calcining process, a 3-D computational model is developed to gain insight of the thermal-flow and combustion behavior in the calciner. Comprehensive models are employed to simulate the moving petcoke bed with a uniform distribution of moisture evaporation, devolatilization, and coke fines entrainment rate with a conjugate radiation-convection-conduction calculation. The following parametric studies are conducted: rotation angles, tertiary air injection angles, devolatilization zone length, discharge end gas extractions without injecting natural gas, variations of coke bed properties (thermal conductivity and heat capacity), and coke bed sliding speed. A total of 19 cases have been simulated. The results of studying the effect of tertiary air injection angles show that employing 15° tertiary air injection angle provides the best calcining condition than using 30° and 45° injection angles by achieving a higher coke bed temperature and less coke fines entrainment and attrition rate. In an attempt to reduce natural gas consumption, employing gas extraction at the discharge end successfully draws the hot combustion gas from the tertiary air zone towards the discharge end without burning natural gas. The coke bed temperature between 6 and 21 m from the discharge end is successfully raised from 10 to 100 K, but discharge end temperature is reduced 150 K without burning natural gas. The extracted gas at 1,000 K is too low to be returned to the kiln, but it could be used to preheat the tertiary air.
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Zhang, Zexuan, and Ting Wang. "Simulation of Combustion and Thermal-Flow Inside a Petroleum Coke Rotary Calcining Kiln: Part 1—Process Review and Modeling." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12634.
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Calcined coke is an important material for making carbon anodes for smelting of alumina to aluminum. Calcining is an energy intensive industry and a significant amount of heat is wasted in the calcining process. Efficiently managing this energy resource is tied to the profit margin and survivability of a calcining plant. To help improve the energy efficiency of the calcining process, a 3-D computational model is developed to gain insight of the thermal-flow and combustion behavior in the calciner. Comprehensive models are employed to simulate the moving petcoke bed with moisture evaporation, devolatilization, and coke fines combustion with a conjugate radiation-convection-conduction calculation.
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Wells, Kaden, and Mark G. Turner. "Open Source Axial Compressor Mean-Line Design Tool for Supercritical Carbon Dioxide." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59961.
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Abstract This paper presents an open-source axial compressor design code developed for applications using Supercritical CO2 (S-CO2). Real property tables are generated using REFPROP (Reference Fluid Thermodynamic and Transport Properties Database) linked to MATLAB. These tables are created and are provided for S-CO2 and could be created for any fluid in the database. At this time, only a single-phase fluid has been implemented. The tables are imported into the mean-line code and are interpolated with cubic splines to calculate real properties based on two given properties. The mean-line code is written in Python to allow portability and convenient plotting capability. The inputs are simple ascii files with the overall compressor details, stage data, and an optional IGV file. The code uses the axial flow equations of continuity, energy, and angular momentum in addition to velocity triangles to calculate state properties at every station. A free vortex assumption at each between-blade row station is used to calculate information at hub, pitch, and tip. The input for each stage includes the Mach number and absolute flow angle at the rotor leading edge in addition to the total enthalpy rise across each rotor. Loss coefficients, solidity, aspect ratio and axial spacing are also specified for each blade row along with blockage to account for wakes, boundary layers, and bleed. A hub radius is also specified. These parameters allow for a complete set of realistic inputs for the design of axial compressors using S-CO2 as the working fluid. The output can be used to assess the design and is used as the start of higher fidelity design.
Reports on the topic "Rotary files"
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Price, J. T., D. Cameron, and P. Couturier. Potential of briquetting QIT rotary kiln fines. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/304577.
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Herman, D. ROTARY FILTER FINES TESTING FOR SMALL COLUMN ION EXCHANGE. Office of Scientific and Technical Information (OSTI), August 2011. http://dx.doi.org/10.2172/1022759.
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COMPLETE SET CONSTRUCTION TECHNOLOGY OF LARGE OPENING CABLE DOME STRUCTURE BASED ON INTEGRATED ANALYSIS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.312.
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With the development of design level and construction technology of cable supported system, various new-type prestressed structures emerge, and a number of public buildings with cable dome structure have been constructed. The structural characteristics and complete set construction technology of Chengdu Phoenix Mountain Stadium are introduced in this paper. In view of the construction difficulties, nonlinear dynamic analysis method was used to carry out simulation of the whole construction process and optimize the construction scheme. The research was carried out from the aspects of rotary lifting technology, horizontal restraint system and high anti-side lifting frame group. Besides, the design and construction integrated analysis of the large opening cable dome structure was carried out, and the construction technology of " internal tension ring-cable net integrated lifting " was innovatively proposed. This method fills the blank of the construction method of the system, greatly improves the construction efficiency, and ensures the construction quality and safety.