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| Year : 2009 | Volume
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| Issue : 1 | Page : 3-9 |
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| Canal-centering ability: An endodontic challenge |
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Deivanayagam Kandaswamy1, Nagendrababu Venkateshbabu1, Ilango Porkodi1, Gali Pradeep2
1 Department of Conservative Dentistry and Endodontics, Sri Ramachandra Dental College, Porur, Chennai - 600 116, India
2 Department of Conservative Dentistry and Endodontics, Meenakshi Ammal Dental College, Alapakkam Main Road, Maduravoyal, Chennai - 600 095, India
Click here for correspondence address and email
| Date of Submission | 09-Mar-2009 |
| Date of Acceptance | 19-Mar-2009 |
| Date of Web Publication | 10-Jul-2009 |
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 Abstract | | |
During instrumentation of the root canal, it is important to develop a continuously tapered form and to maintain the original shape and position of the apical foramen. However, the presence of curvatures may cause difficulty in root canal instrumentation. The ability to keep the instruments centered is essential to provide a correct enlargement, without excessive weakening of the root structure. Several studies have shown that Ni-Ti instruments remain significantly more centered and demonstrated less canal transportation than stainless steel files. Considerable research has been undertaken to understand the several factors related to an instrument's canal-centering ability. In this article, we have discussed the influence of various parameters such as alloys used in the manufacture of instruments, instrument cross-section, taper, and have given tips on canal-centering ability. Keywords: Canal-centering ability; cross-section; design; Ni-Ti; stainless steel; taper; tip.
How to cite this article:
Kandaswamy D, Venkateshbabu N, Porkodi I, Pradeep G. Canal-centering ability: An endodontic challenge. J Conserv Dent 2009;12:3-9 |
How to cite this URL:
Kandaswamy D, Venkateshbabu N, Porkodi I, Pradeep G. Canal-centering ability: An endodontic challenge. J Conserv Dent [serial online] 2009 [cited 2023 Nov 30];12:3-9. Available from: https://www.jcd.org.in/text.asp?2009/12/1/3/53334 |
| Introduction | |  |
Canal-shaping is a critical aspect of endodontic treatment because it influences the outcome of the subsequent phases of canal irrigation, filling, and the overall success of the treatment itself. Root canal therapy involves the use of instruments and irrigants to shape and chemomechanically prepare the root canal system to receive a three-dimensional filling of the entire root canal space. [1],[2] The goal of instrumentation is to produce a continuously tapered preparation that maintains the canal anatomy, keeping the foramen as small as possible [1],[3] without any deviation from the original canal curvature. [1],[2]
Deviation from the original canal curvature can lead to:
- Excessive and inappropriate dentin removal [4]
- Straightening of the canal and creation of a ledge in the dentinal wall [5]
- A biochemical defect known as an elbow which forms the coronal to the elliptical-shaped apical seal [6]
- Canals with hourglass appearance in cross-section that requires stripping [4]
- Overpreparation that weakens the tooth, resulting in fracture of the root [4]
Various parameters that affect canal-centering ability:
- Alloys used in manufacturing instruments
- Instrument design
- Cross-section
- Taper
- Tip
Alloys used in manufacturing instruments:
The most commonly used materials are:
- Stainless steel
- Nickel-Titanium alloy
Historically, root canal instrumentation has involved the use of stainless steel hand files. Numerous investigations have shown that the preparation of curved root canals with stainless steel instruments frequently results in undesirable aberrations such as elbows, zips, and danger zones. [7]
Civijan [9] was one of the first investigators to propose a nickel-titanium (Ni-Ti) alloy for its use in endodontics in 1975. In 1988, Walia et al. [10] suggested a greater modification in endodontic instruments-replacing stainless steel with a Ni-Ti alloy. [2] Ni-Ti endodontic instruments were introduced to facilitate instrumentation of curved canals. Ni-Ti instruments are superelastic and could flex far more than stainless steel instruments before exceeding their elastic limits. [10],[11],[12],[13]
If the instruments are not precurved in a curved canal, the amount of stress acting on the instrument to negotiate the curve is more for stainless steel and less for Ni-Ti instruments. The amount of force required or acting on the instrument to bend is the amount of force the instrument will exert and lead to more cutting on the outer curvature of the canal, which results in eccentricity. As Ni-Ti instruments require less stress to bend, they exert less force and being nonaggressive by nature, do not lead to excess cutting on either side. Stainless steel, however, tends tendency to cut more in one wall than the other.
This phenomenon occurs because the bending of the instrument within the canal occurs within its elastic limit, and this tendency to recoil is the cause for eccentricity in cutting. Precurving of stainless steel instruments is done within the plastic phase.
Ni-Ti alloys have been found to be 2-3 times more elastic than similarly manufactured stainless steel files. This property may allow Ni-Ti files to negotiate curved canals with less lateral stress but do not allow the precurving of Ni-Ti files. Whether the physical tendency of Ni-Ti files to remain straight, prevents ideal instrumentation or whether their high flexibility allows a better negotiation of curved canals despite the inability to precurve, still remains questionable. [2]
Parameswaran et al., [14] Al omarii et al., [15] Coleman et al., [16] and Miglani et al. [17] reported transportation, zipping, and straightening of canals using stainless steel instruments. Several studies have confirmed that rotary Ni-Ti files maintain the original canal curvature better than do stainless steel files. [1],[2],[7],[18],[19],[20],[21],[22],[23],[24],[25] The stainless steel files produce a larger extent of movement because of their hardness, which was shown to be 3-4 times harder than Ni-Ti alloys. [17] Carvalho reported that even after precurving and anticurvature filing, a small amount of transportation could be expected from stainless steel instruments. [2]
| Cross - Section | | |
A study by Dina Al-Sudani [26] compared the canal-centering ability of a U- shaped instrument (Profile) with other asymmetric cross-section (K3) and convex, triangular cross-section (RaCe) instruments. The results of the study showed that the Profile system produced significantly less transportation and remained centered around the original canal to a greater degree than did other systems. This differential performance could be attributed to the different designs of these instruments. The Profile instrument uses the U-shaped cross section with radial land areas having a negative rake angle that cuts equally over 360 o C with a planing action and is considered to be self-centering. The K3 instrument also has a U-shaped file design but has a positive 45 o C rake angle. As dentin is a resilient material, the K3 instrument's positive rake angle makes it work like a shaver on the dentin surface; thus, maintaining canal-centering will be difficult. Studies done by Short et al. [27] and Versumer et al. [28] compared the canalcentering ability of ProFile & Lightspeed rotary Ni-Ti instruments in mandibular molars with curvatures between 20 and 40 o C. The results showed that both systems had a U-shaped cross-section and produced significantly less transportation and were well centered.
Furthermore, in a study by Miglani et al. [17] that compared the canal-centering ability of ProFile, HERO 642 & SS K files in canal curvatures ranging from 20 to 40 o C, the Profile series instruments showed superior canal-centering ability and performed better than both Hero 642 and SS Kfiles. The trihelical Hedstrom design of the Hero system having a thicker inner core is less flexible and resistant to bending. Hence, it could have caused the Hero 642 to show more transportation than did the triple helical configuration of Profile.
Previous studies by Iqbal et al. [29] compared the apical transportation between the ProFile and ProTaper instruments and showed that the ability of the file to remain centered may not entirely depend on U-file design or the presence of radial lands. The variable taper design of Protaper dampens the screw-in effect. Thus, a simpler convex triangular design, as seen in the case of Protaper, is capable of performing equally well or slightly better than ProFile. A comparative study [30] of six rotary Ni-Ti systems (Flexmaster, System Gt, HERO 642, K3, ProTaper, and Race) in extracted mandibular molars with curvatures up to 70o and embedded in a muffle system, showed that ProTaper instruments created more regular canal diameters.
Conversely, Yoshmine et al. [31] compared the shaping effects of three Ni-ti rotary instruments: ProTaper, K3, & RaCe, in simulated S-shaped canals. They showed that the ProTaper group caused significantly greater widening of canals, especially on the inner sides of the curved region, tending towards straightening of the canal, whereas the K3 and RaCe groups showed no indication of deviation. Schafer et al. [32] have indicated that correlations between the bending properties and cross-sectional surface areas of different Ni-Ti rotary instruments are highly significant. According to their results, the cross-sectional area of 0.04-tapered K3 files was nearly twice the size of the RaCe files with the same tip size and taper, indicating that the former files are less flexible than latter. In conclusion, Ni-ti systems having less cross-sectional area as well as more flexible instruments like K3 and RaCe should be used for canals with more complex curvature.
Musikant et al. compared the shaping ability of conventional reamers and files with a newly introduced, noninterrupted, flat-sided design (EZ-Fill SafeSider) reamer and file system. Conventional files produce the greatest engagement of the instrument with the walls of the canal and consequently, the greatest amount of resistance as they negotiate to the apex. This is not the case for noninterrupted, flat-sided instruments (EZ-FILL safe siders). The flat side reduces the cross-sectional diameter, making it thinner and more flexible, allowing it to negotiate the highly curved canals more easily and have better centering ability. [33]
| Taper | | |
Yang et al. studied the shaping ability of progressive vs constant taper instruments in curved root canals with curvatures ranging from 20 to 40 o C . [34] Better compliance was obtained with the original canal shape using the constant taper (Heroshaper). The constant taper produced good centering ability in the apical section compared to instruments with progressive tapers along the cutting surface (ProFile). The final file of the Protaper F3 has an apical taper of 0.09 which is much larger than the Heroshaper which has a 0.04 taper. As the large taper of the F3 instrument increases the stiffness of the tip, the use of larger and greater taper instruments in moderately to severely curved canals should be considered carefully.
Schafer & Vlassis [35] and Paque et al. [36] compared the shaping ability of ProTaper and RaCe in simulated curved canals. Studies showed that both instruments were relatively safe although Race respected the original curvature better than ProTaper. The reason could be attributed to the variable tapers along the cutting surface of ProTaper files. The decreasing taper sequence of the finishing files enhances the strength of the file, but increases the stiffness of their tips. For example, the taper at the tip of ProTaper size 30 is 9%, whereas the taper of a size 20 is only 7%. And it is also due to increased taper of ProTaper shaping files up to 19%,whereas RaCe instruments are available only with tapers of maximum 10%.
| Tip | | |
[Table 1] and [Table 2]
Ponce de Leon Del Bello et al. [8] studied the shaping effects of three types of stainless steel files that differ only in tip shape by using curved canals in acrylic blocks. The tip shapes were: (a) pyramidal (Flex-O)with sharp transition angles and a forward-cutting ridge on the face, (b) conical (Mor-Flex) with sharp transition angles and a smooth face, and (c) biconical (Flex-R) with reduced transition angles and dual-guiding faces. The study suggested that during crown-down rotational instrumentation, the original canal curvature is maintained better by biconical file tips. Cutting edges increased shaping to the inside because the canal deflects the instrument's tip through a curvature. This transportation is increased when a file design prevents removal of the outer wall as it progresses through a curved region. Thus, the biconical design generates diameters greater than the file tip at levels that are more coronal than 1 mm. The diameters are consistently less for the biconical design than for the pyramidal and conical designs. Removal of the transition angle and formation of lands allows the canal to reorient the tip through curvatures. As the transition angles are reduced, the file stays centered within the original canal and cuts all sides more evenly. Ponce de Leon Del Bello et al. agree that the instrumentation of curved canals is more successful with "modified" tip instruments, i.e ., biconical-shaped tips.
Veltri et al. [37] compared the shaping abilities of Protaper and GT rotary files to shape curved canals. Dentin removal and mean asymmetry showed no significant differences between the two systems. The canal-centering ability of ProFile, Hero 642, & SS K files was compared using the kuttler cube method in a study done by Miglani et al. [17] Both the Ni-Ti systems showed superior canal-centering ability compared to the SS hand instruments. The standard cutting tip can be too aggressive because the first flute makes the initial cut in canal transportation, whereas the rotary system has a modified noncutting tip. The noncutting tip that guides the blades of the instrument in the canal lumen could be the reason for Ni-Ti systems like the ProFile and Hero 642 remaining more centered than the standard K-files.
Hulsmann et al. [7] compared several parameters of root canal preparation using two different Ni-Ti instruments, the Hero 642 and the Quantec SC systems, with canal curvatures between 20 and 40 o C. They found that Quantec instruments produced more severe straightening probably because they have a rather aggressive, four-faceted cutting tip instead of the noncutting tip seen in the Hero 642 instruments.
Song et al. compared the centering ability for three instrumentation techniques using two Ni-Ti (GT and Nitiflex files) and one SS K-type file in teeth with curvatures between 15 and 45 o C. Results showed that both Ni-Ti instruments had a blunt transition angle in the tip which allowed the instrument to plane the canal walls rather than engaging and screwing into them. This may contribute to the even cutting of dentin along the canal wall and making these instruments self-centered in comparison to the SS K-type files. [38]
| Conclusion | | |
From a review of the available literature, we conclude that:
- Ni-Ti instruments show better canal-centering ability than stainless steel instruments.
- Instruments with less cross-sectional area & taper will show better canal-centering ability.
- Instruments with noncutting tips show better canal-centering ability.[59]
| References | | |
| 1. | Park H. A comparison of Greater Taper files, Profiles, and stainless steel files to shape curved root canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2001;9:715-8.  |
| 2. | Carvalho LA, Bonetti I, Borges MA. A comparison of molar root canal preparation using Stainless Steel and Ni-Ti instruments. J Endod 1999;25:807-10. [PUBMED] |
| 3. | Matwychuk MJ, Bowles WR, McClanahan SB, Hodges JS, Pesun IJ. Shaping abilities of two different engine-driven rotary Ni-Ti systems or stainless steel balanced-force technique in mandibular molars. J Endod 2007;33:868-71. [PUBMED] [FULLTEXT] |
| 4. | Endodontics Ingle, Elsevier BC. 5 th ed. 2002. p. 775. |
| 5. | Gutmann JL. Problem solving in Endodontics. 3 rd ed. Mosby Inc; 1997. p. 96. |
| 6. | Gutmann JL. Problem solving in Endodontics. 3 rd ed. Mosby Inc; 1997. p. 105. |
| 7. | Hülsmann M, Schade M, Schδfers F. A comparative study of root canal preparation with HERO642 and Quantec SC rotary Ni-Ti instruments. Int Endod J 2001;34:538-46. |
| 8. | Ponce de Leon Del Bello T, Wang N, Roane JB. Crown-Down Tip Design and Shaping. J Endod 2003;29:513-8. |
| 9. | Gambill JM, Alder M, del Rio CE. Comparison of Ni-Ti and Stainless steel hand-file instrumentation using computed tomography. J Endod 1996;22:369-75. |
| 10. | Walia HM, Brantley WA, Gerstein H. An initial investigation of the bending and torsional properties of nitinol root canal files. J Endod 1988;14;346-51. |
| 11. | Serene TP. Nickel -titanium instruments: application in endodontics. EuroAmerica: Ishiyaku Inc. 1994. |
| 12. | Cohen S. Pathways of pulp.6 th ed. 1994. p. 206. |
| 13. | Nehme WB. Elimination of intracanal metallic obstruction by abrasion using operational microscope and ultrasonics. J Endod 2001;27:365-7. |
| 14. | Tharuni SL, Parameswaran A, Sukumaran VG. A comparison of canal preparation using K-file and lightspeed in resin blocks. J Endod 1996;22:474-6. |
| 15. | al-Omari MA, Bryant S, Dummer PM.. Comparison of two stainless steel files to shape simulated root canals. Int Endod J 1997;30:35-45. |
| 16. | Coleman CL, Suel TA. Analysis of Ni-Ti versus stainless steel instrumentation in resin simulated canals. J Endod 1997;23:232-5. |
| 17. | Miglani S, Gopikrishna V, Parameswaran, Kandaswamy D, Krithika. Canal centering ability of two Ni-Ti rotary systems compared with SS hand instrumentation in curved canals using Kuttler's endodontic cube-An in vitro study.Endodontology 2004;16:42-8. Not found in pub med |
| 18. | Glossen CR, Hiller RH, Dove B, Del Rio CE A comparison of root canal preparations using Ni-Ti hand, Ni-Ti engine-driven, and K-Flex endodontic instruments. J Endod 1995;21;146-51. |
| 19. | Thomson SA, Dummer PM. Shaping ability of lightspeed rotary Ni-Ti instruments in simulated root canals. part 2. J Endod 1997;23:742-7. |
| 20. | Pettiette MT, Metzger Z, Philips C, Trope M. Endodontic complications of root canal therapy performed by dental students with stainless steel K-files and nickel-titanium hand files. J Endod 1999;25:230-4. |
| 21. | Bryant ST, Thompson SA, al-Omario MAO, Dummer PM. Shaping ability of Profile rotary Ni-Ti instruments with ISO sized tips in simulated root canals: Part 1. Int Endod J 1998;31:275-81. |
| 22. | Bryant ST, Thompson SA, al-Omario MA, Dummer PM. Shaping ability of Profile rotary Ni-Ti instruments with ISO sized tips in simulated root canals: Part 2. Int Endod J 1998;31:282-9. |
| 23. | Knowles KL. Ibarrola JL. Christiansen RK . Assessing apical deformation and transportation following the use of Lightspeed root canal instruments. Int Endod J 1996;29:113-7. |
| 24. | Javaheri HH, Javaheri GH. A comparison of three Ni-Ti rotary instruments in apical transportation. J Endod 2007;33:284-6. |
| 25. | Short JA, Morgan LA, Baumgartner JC. A comparison of canal canal centering ability of four instrumentation techniques. J Endod 1997;23:503-7. |
| 26. | Al-Sudani D, Al-Shahrani S. A comparison of the canal centering ability of ProFile,K3,and RaCe Nickel Titanium rotary systems. J Endod 2006;32:1198-201. |
| 27. | Short JA, Morgan LA, Baumgartner JC. A Comparison of canal centering ability of four instrumentation techniques. J Endod 1997;23:503-7. |
| 28. | Versümer J, Hülsmann M, Schδfers F. A comparative study of root canal preparation using ProFile.04 and Lightspeed rotary Ni-Ti instruments. Int Endod J 2002;35:37-46. |
| 29. | Iqbal MK, Firic S, Tulcan J, Karabucak B, Kim S. Comparison of apical transportation between ProFile and ProTaper Ni-Ti rotary instruments. Int Endod J 2004;37:359-64. |
| 30. | Guelzow A, Stamm O, Martus P, Kielbassa AM. Comparative study of six rotary Ni-Ti systems and hand instrumentation for root canal preparation. Int Endod J 2005;38:743-52. |
| 31. | Yoshimine Y, Ono M, Akamine A. The shaping effects of three Ni-Ti rotary instruments in simulated S-shaped canals. J Endod 2005;31:373-5. |
| 32. | Schafer E, Dzepina A, Dent CM, Danesh G. Bending properties of rotary nickel titanium instruments. Oral Surg Oral Med Oral path Oral radiol Endod 2003;96:757-63. |
| 33. | Musikant BL, Cohen BI, Deutsch AS. Comparison instrumentation time of conventional reamers and files versus a new,noninterrupted,flat-sided design. J Endod 2004;30:107-9. |
| 34. | Yang GB, Zhou XD, Zheng YL, Zhang H, Shu Y, Wu HK. Shaping ability of progressive versus constant taper instruments in curved root canals of extracted teeth. Int Endod J 2007;40:707-14. |
| 35. | Schafer E, Vlassis M. Comparative investigation of two rotary Ni-Ti instruments:Protaper versus RaCe.Part 2.Cleaning effectiveness and shaping ability in severly curved root canals of extracted teeth. Int Endod J 2004;37:239-48. |
| 36. | Paquι F, Musch U, Hülsmann M. Comparison of root canal preparation using RaCe and Protaper rotary Ni-Ti instruments. Int Endod J 2005;38:8-16. |
| 37. | Veltri M, Mollo A, Pini PP, Ghelli LF, Balleri P. In vitro comparison of shaping abilities of ProTaper and GT rotary files. J Endod 2004;30:163-6. |
| 38. | Song YL, Bian Z, Fan B, Fan MW, Gutmann JL, Peng B. A comparison of instrument- centering ability within the root canal for three contemporary instrumentation techniques. Int Endod J 2004;37:265-71. |
| 39. | Peters OA, Schφnenberger K, Laib A. Effects of four Ni-Ti preparation techniques on root canal geometry assessed by micro computed tomography. Int Endod J 2001;34:221-30. |
| 40. | Gluskin AH, Brown DC, Buchanan LS. A reconstructed computerized tomographic comparison of Ni-Ti rotary GT files versus traditional instruments in canals shaped by novice operators. Int Endod J 2001;34:476-84. |
| 41. | Deplazes P, Peters O, Barbakow F. Comparing apical preparations of root canals shaped by Ni-Ti rotary instruments and Ni-Ti hand instruments. J Endod 2001;27:196-202. |
| 42. | Ponti TM, McDonald NJ, Kuttler S, Strassler HE, Dumsha TC. Canal centering ability of two Rotary File Systems. J Endod 2002;28:283-6. |
| 43. | Hata G, Uemura M, Kato AS, Imura N, Novo NF, Toda T. A Comparison of shaping ability using ProFile,GT File,and Flex-R endodontic instruments in simulated canals. J Endod 2002;28:316-21. |
| 44. | Iqbal MK, Maggiore F, Suh B, Edwards KR, Kang J, Kim S. Comparison of Apical Transportation in Four Ni-Ti rotary instrumentation techniques. J Endod 2003;29:587-91. |
| 45. | Yun HH, Kim SK. A comparison of shaping abilities of 4 Ni-Ti rotary instruments in simulated root canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2003;95:228-33. |
| 46. | Bergmans L, Van Cleynenbreugel J, Beullens M, Wevers M, Van Meerbeek B, Lambrechts P. Progressive versus constant tapered shaft design using Ni-Ti rotary instruments. Int Endod J 2003;36:288-95. |
| 47. | Ta?demir T, Aydemir H, Inan U, Unal O. Comparison with Hero 642 rotary Ni-Ti instruments compared with stainless steel hand K-file assessed using computed tomography. Int Endod 2005;38:402-8. |
| 48. | Ozgur Uyanik M, Cehreli ZC, Ozgen Mocan B, Tasman Dagli F. Comparative evaluation of three Ni-Ti instrumentation systems in Human teeth using computed tomography. J Endod 2006;32:668-71. |
| 49. | Merrett SJ, Bryant ST, Dummer PM. Comparison of the shaping ability of RaCe and FlexMaster rotary Ni-Ti systems in simulated canals. J Endod 2006;32:960-2. |
| 50. | Loizides A, Eliopoulos D, Kontakiotis E. Root canal transportation with a Ni-Ti rotary file system and stainless steel hand files in simulated root canals. Quintessence Int 2006;37:369-74. |
| 51. | Rφdig T, Hülsmann M, Kahlmeier C. Comparison of root canal preparation with two rotary Ni-Ti instruments: ProFile.04 and GT rotary. Int Endod 2007;40:553-62. |
| 52. | Loizides AL, Kakavetsos VD, Tzanetakis GN, Kontakiotis EG, Eliades G. A comparative study of the effects of two Ni-Ti preparation techniques on root canal geometry assessed by microcomputed tomography. J Endod 2007;33:1455-9. |
| 53. | Iqbal MK, Banfield B, Lavorini A, Bachstein B. A comparison of Lightspeed LS1 and Lightspeed LSX Ni-Ti rotary instruments in apical transportation and length control in simulated root canals. J Endod 2007;33:268-71. |
| 54. | Uzun O, Topuz O, Aydın C, Alaηam T, Aslan B. Enlarging characteristics of four Ni-Ti rotary instruments systems under standardized conditions of operator-related variables. J Endod 2007;33:1117-20. |
| 55. | Hartmann MS, Barletta FB, Camargo Fontanella VR, Vanni JR. Canal transportation after root canal instrumentation:A comparative study with computed tomography. J Endod 2007;33:962-5. |
| 56. | Kosa DA, Marshall G, Baumgartner JC. An analysis of canal centering using mechanical instrumentation techniques. J Endod 1999;25:441-5. |
| 57. | Schδfer E, Schlingemann R. Efficiency of rotary Ni-Ti K3 instruments compared with stainless steel hand K-Flexofile. Part 2. Cleaning effectiveness and shaping ability in severly curved root canals of extracted teeth. Int Endod J 2003;36:208-17. |
| 58. | Perez F, Schoumacher M, Peli JF. Shaping ability of rotary instruments in simulated canals: stainless steel ENDOflash and Ni-Ti HERO shaper. Int Endod J 2005;38:637-44. |
| 59. | MiglaniRL. Narayanan,Lakshmi, Rao CV. CT analysis of transportation and centering ratio using three rotary Ni-Ti files in curved root canals-An in vitro study. Endodontology 2008: 18-24. |
Correspondence Address:
Nagendrababu Venkateshbabu
Department of Conservative Dentistry and Endodontics, Sri Ramachandra Dental College & Hospital, Sri Ramachadra University, Porur, Chennai - 600 116
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0972-0707.53334
[Table 1], [Table 2] |
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| Faizal C Peedikayil, Puzhikkunnath K Nabeeh, Chandru T Premkumar, Soni Kottayi, Dhanesh Narasimhan | | Journal of South Asian Association of Pediatric Dentistry. 2021; 4(2): 112 | | [Pubmed] | [DOI] | | | 15 |
Cone-beam Computed Tomographic Analysis of Canal Transportation and Centering Ability of Three Different Nickel-Titanium Rotary File Systems |
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| Balaji Sopanrao Kapse, Pradnya S. Nagmode, Jayshree Ramkrishna Vishwas, Hrishikesh B. Karpe, Harshal V. Basatwar, Shubham P. Godge | | Open Access Macedonian Journal of Medical Sciences. 2021; 9(D): 30 | | [Pubmed] | [DOI] | | | 16 |
A micro-computed tomographic assessment of root canal preparation with conventional and different rotary files in primary teeth and young permanent teeth |
|
| Gülce Esentürk, Efe Akkas, Evren Cubukcu, Emre Nagas, Ozgur Uyanik, Zafer C. Cehreli | | International Journal of Paediatric Dentistry. 2020; 30(2): 202 | | [Pubmed] | [DOI] | | | 17 |
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|
| Ramya Shenoy, Suprabha B Srikrishna, Karuna Y Mahabala, Arathi Rao, Vignesh Palanisamy | | World Journal of Dentistry. 2019; 10(4): 306 | | [Pubmed] | [DOI] | | | 18 |
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|
| Renato de Toledo Leonardo, Carlos Garcia Puente, Alejandro Jaime, Carol Jent | | The Journal of Contemporary Dental Practice. 2013; 14(1): 149 | | [Pubmed] | [DOI] | | | 19 |
Effects of preparation techniques on root canal shaping assessed by micro-computed tomography |
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| Miranda Stavileci,Veton Hoxha,Ömer Görduysus,Ilkan Tatar,Kjell Laperre,Jeroen Hostens,Selen Küçükkaya,Merita Berisha | | Medical Science Monitor Basic Research. 2013; 19: 163 | | [Pubmed] | [DOI] | | | 20 |
Evaluation of the efficacy of rotary vs. hand files in root canal preparation of primary teeth in vitro using CBCT |
|
| P. K. Musale,S. A. V. Mujawar | | European Archives of Paediatric Dentistry. 2013; | | [Pubmed] | [DOI] | | | 21 |
Thermodynamics of an Asymmetric DNA Holliday Junction |
|
| Li Li | | BIO. 2011; 1(1): 52 | | [VIEW] | [DOI] | | | 22 |
Postoperative Pain after Manual and Mechanical Glide Path: A Randomized Clinical Trial |
|
| Damiano Pasqualini, Livio Mollo, Nicola Scotti, Giuseppe Cantatore, Arnaldo Castellucci, Giuseppe Migliaretti, Elio Berutti | | Journal of Endodontics. 2011; | | [VIEW] | [DOI] | |
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