[1. Suter B, Lussi A, Sequeira P. Probability of removing fractured instruments from root canals. Int Endod J, 2005;38:112-123.10.1111/j.1365-2591.2004.00916.x]Search in Google Scholar
[2. Iqbal MK, Kohli MR, Kim JS. A retrospective clinical study of incidence of root canal instrument separation in an endodontics graduate program: A PennEndo database study. J Endod, 2006;32:1048-1052.10.1016/j.joen.2006.03.001]Search in Google Scholar
[3. Tzanetakis GN, Kontakiotis EG, Maurikou DV, Marzelou MP. Prevalence and management of instrument fracture in the postgraduate endodontic program at the Dental School of Athens: A five-year retrospective clinical study. J Endod, 2008;34:675-678.10.1016/j.joen.2008.02.039]Search in Google Scholar
[4. Ramirez-Salomon M, Soler-Bientz R, de la Garza-González R, Palacios-Garza CM. Incidence of Lightspeed separation and the potential for bypassing. J Endod, 1997;23:586-587.10.1016/S0099-2399(06)81128-3]Search in Google Scholar
[5. Baumann MA, Roth A. Effect of experience on quality of canal preparation with rotary nickel-titanium files. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 1999;88:714-718.10.1016/S1079-2104(99)70015-6]Search in Google Scholar
[6. Al-Fouzan KS. Incidence of rotary ProFile instrument fracture and the potential for bypassing in vivo. Int Endod J, 2003;36:864-867.10.1111/j.1365-2591.2003.00733.x14641426]Search in Google Scholar
[7. Hülsmann M, Herbst U, Schäfers F. Comparative study of root-canal preparation using Lightspeed and Quantec SC rotary NiTi instruments. Int Endod J, 2003;36:748-756.10.1046/j.1365-2591.2003.00725.x14641438]Search in Google Scholar
[8. Ankrum MT, Hartwell GR, Truitt JE. K3 Endo, ProTaper, and ProFile systems: breakage and distortion in severely curved roots of molars. J Endod, 2004;30:234-237.10.1097/00004770-200404000-0001315085054]Search in Google Scholar
[9. Fishelberg G, Pawluk JW. Nickel-titanium rotary-file canal preparation and intracanal file separation. Compend Contin Educ Dent, 2004; 25:17-18, 20-22, 24, 47.]Search in Google Scholar
[10. Spili P, Parashos P, Messer HH. The impact of instrument fracture on outcome of endodontic treatment. J Endod, 2005;31:845-850.10.1097/01.don.0000164127.62864.7c16306815]Search in Google Scholar
[11. Knowles KI, Hammond NB, Biggs SG, Ibarrola JL. Incidence of instrument separation using lightspeed rotary instruments. J Endod, 2006;32:14-16.10.1016/j.joen.2005.10.00816410061]Search in Google Scholar
[12. Wolcott S, Wolcott J, Ishley D, Kennedy W, Johnson S, Minnich S, et al. Separation incidence of Protaper rotary instruments: A large cohort clinical evaluation. J Endod, 2006;32:1139-1141.10.1016/j.joen.2006.05.01517174668]Search in Google Scholar
[13. Wu J, Lei G, Yan M, Yu Y, Yu J, Zhang G. Instrument separation analysis of multi-used ProTaper universal rotary system during root canal therapy. J Endod, 2011;37:758-763.10.1016/j.joen.2011.02.02121787484]Search in Google Scholar
[14. Wang NN, Ge JY, Xie SJ, Chen GZM. Analysis of Mtwo rotary instrument separation during endodontic therapy: a retrospective clinical study. Cell Biochem Biophys, 2014;70:1091-1095.10.1007/s12013-014-0027-024807841]Search in Google Scholar
[15. Cunha RS, Junaid A, Ensinas P, Nudera W, Bueno CE. Assessment of the separation incidence of reciprocating WaveOne files: a prospective clinical study. J Endod, 2014;40:922-924.10.1016/j.joen.2014.03.01624935536]Search in Google Scholar
[16. Crump MC, Natkin E. Relationship of broken root canal instruments to endodontic case prognosis: A clinical investigation. J Am Dent Assoc, 1970;80:1341-1347.10.14219/jada.archive.1970.02595266127]Search in Google Scholar
[17. Hülsmann M, Schinkel I. Influence of several factors on the success or failure of removal of fractured instruments from the root canal. Endod Dent Traumatol, 1999;15:252-258.10.1111/j.1600-9657.1999.tb00783.x10825835]Search in Google Scholar
[18. Ungerechts C, Bårdsen A FI. Instrument fracture in root canals - where, why, when and what? A study from a student clinic. Int Endod J, 2014;47:183-190.10.1111/iej.1213123710943]Search in Google Scholar
[19. Di Fiore PM, Genov KA, Komaroff E, Li Y, Lin L. Nickel-titanium rotary instrument fracture: A clinical practice assessment. Int Endod J, 2006;39:700-708.10.1111/j.1365-2591.2006.01137.x16916359]Search in Google Scholar
[20. Cujé J, Bargholz C, Hülsmann M. The outcome of retained instrument removal in a specialist practice. Int Endod J, 2010;43:545-554.10.1111/j.1365-2591.2009.01652.x20456518]Search in Google Scholar
[21. Cohen SJ, Glassman GD, Mounce R. Rips, strips and broken tips: Handling the endodontic mishap. Oral Health, 2005:10-20.]Search in Google Scholar
[22. Madarati AA, Watts DC, Qualtrough AJ. Opinions and attitudes of endodontists and general dental practitioners in the UK towards the intracanal fracture of endodontic instruments: part 1. Int Endod J, 2008;41:693-701.10.1111/j.1365-2591.2008.01425.x18554183]Search in Google Scholar
[23. Cohen S, Schwartz S. Endodontic complications and the law. J Endod, 1987;13:191-197.10.1016/S0099-2399(87)80139-5]Search in Google Scholar
[24. Torabinejad M, Lemon RR. Procedural accidents. In: Walton R, Torabinejad M, editor. Priciples and Practice of Endodontics. Philadelphia: W.B. Saunders Company; 2002. p. 310-330.]Search in Google Scholar
[25. Madarati AA, Hunter MJ, Dummer PMH. Management of intracanal separated instruments. J Endod, 2013;39:569-581.10.1016/j.joen.2012.12.033]Search in Google Scholar
[26. Lambrianidis T. Risk Management in Root Canal Treatment. Thessaloniki: University Studio Press; 2001.]Search in Google Scholar
[27. Shen Y, Peng B, Cheung GS. Factors associated with the removal of fractured NiTi instruments from root canal systems. Oral Surgery. Oral Med Oral Pathol Oral Radiol Endod, 2004;98:605-610.10.1016/j.tripleo.2004.04.011]Search in Google Scholar
[28. Nevares G, Cunha RS, Zuolo ML, Bueno CE. Success rates for removing or bypassing fractured instruments: A prospective clinical study. J Endod, 2012;38:442-444.10.1016/j.joen.2011.12.009]Search in Google Scholar
[29. Ward JR, Parashos P, Messer HH. Evaluation of an ultrasonic technique to remove fractured rotary nickel-titanium endodontic instruments from root canals: clinical cases. J Endod, 2003;29:764-767.10.1097/00004770-200311000-00018]Search in Google Scholar
[30. Plotino G, Pameijer CH, Maria Grande N, Somma F. Ultrasonics in endodontics: A review of the literature. J Endod, 2007;33:81-95.10.1016/j.joen.2006.10.008]Search in Google Scholar
[31. Fors UGH, Berg JO. A method for the removal of separated endodontic instruments from root canals. J Endod, 1983;9:156-159.10.1016/S0099-2399(83)80038-7]Search in Google Scholar
[32. Weisman MI. The removal of difficult silver cones. J Endod, 1983;9:210-211.10.1016/S0099-2399(83)80094-6]Search in Google Scholar
[33. Roda RS, Gettleman BH. Nonsurgical Retreatment. In: Hargreaves KM, Cohen S, editor. Cohen’s Pathways of the pulp. St Louis Missouri: Mosby Elsevier; 2011, p. 890-952.10.1016/B978-0-323-06489-7.00025-4]Search in Google Scholar
[34. Suter B. A new method for retrieving silver points and separated instruments from root canals. J Endod, 1998;24:446-448.10.1016/S0099-2399(98)80032-0]Search in Google Scholar
[35. Roig-Greene JL. The retrieval of foreign objects from root canals: a simple aid. J Endod, 1983;9:394-397.10.1016/S0099-2399(83)80193-9]Search in Google Scholar
[36. Terauchi Y, O’Leary L, Suda H. Removal of separated files from root canals with a new file-removal system: Case reports. J Endod, 2006;32:789-797.10.1016/j.joen.2005.12.009]Search in Google Scholar
[37. Gettleman BH, Spriggs KA, ElDeeb ME, Messer HH. Removal of canal obstructions with the Endo Extractor. J Endod, 1991;17:608-611.10.1016/S0099-2399(06)81834-0]Search in Google Scholar
[38. Spriggs KA, Gettleman BH, Messer HH. Evaluation of a new method for silver point removal. J Endod, 1990;16:335-338.10.1016/S0099-2399(06)81945-X]Search in Google Scholar
[39. Yoldas O, Oztunc H, Tinaz C, Alparslan N. Perforation risks associated with the use of Masserann endodontic kit drills in mandibular molars. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2004;97:513-517.10.1016/j.tripleo.2003.09.007]Search in Google Scholar
[40. Ruddle CJ. Nonsurgical retreatment. J Endod. 2004; 30:827–845.10.1097/01.don.0000145033.15701.2d]Search in Google Scholar
[41. Souyave LC, Inglis AT, Alcalay M. Removal of fractured instruments using ultrasonics. Br Dent J, 1985;159:251-253.10.1038/sj.bdj.4805695]Search in Google Scholar
[42. Nagai O, Tani N, Kayaba Y, Kodama S, Osada T. Ultrasonic removal of broken instruments in root canals. Int Endod J, 1986;19:298-304.10.1111/j.1365-2591.1986.tb00493.x]Search in Google Scholar
[43. Kerekes K, Tronstad. Long-term results of endodontic treatment performed with a standardized technique. J Endod, 1979;5:83-90.10.1016/S0099-2399(79)80154-5]Search in Google Scholar
[44. Park E. Ultrasonics in endodontics. Endod Topics, 2013;29:125-159.10.1111/etp.12044]Search in Google Scholar
[45. Sleiman WP. The use of a chelating agent and ultrasonic tips in the retrieval of broken rotary NiTi. Oral health. 2006;49-53.]Search in Google Scholar
[46. Terauchi Y, O’Leary L, Yoshioka T, Suda H. Comparison of the time required to create secondary fracture of separated file fragments by using ultrasonic vibration under various canal conditions. J Endod, 2013;39:1300-1305.10.1016/j.joen.2013.06.021]Search in Google Scholar
[47. Ruddle CJ. Micro-endodontic non-surgical retreatment. Dent Clin North Am, 1997;41:429-454.10.1016/S0011-8532(22)00061-1]Search in Google Scholar
[48. Yu DG, Kimura Y, Tomita Y, Nakamura Y, Watanabe H, Matsumoto K. Study on removal effects of filling materials and broken files from root canals using pulsed Nd:YAG laser. J Clin Laser Med Surg, 2000;18:23-28.10.1089/clm.2000.18.2311189108]Search in Google Scholar
[49. Cvikl B, Klimscha J, Holly M, Zeitlinger M, Gruber R, Moritz A. Removal of fractured endodontic instruments using an Nd:YAG laser. Quintessence Int, 2014;45:569-575.]Search in Google Scholar
[50. Ormiga F, da Cunha Ponciano Gomes JA, de Araújo MC. Dissolution of nickel-titanium endodontic files via an electrochemical process: a new concept for future retrieval of fractured files in root canals. J Endod, 2010;36:717-720.10.1016/j.joen.2009.11.02420307750]Search in Google Scholar
[51. Ormiga F, da Cunha Ponciano Gomes JA, de Araújo MC, Barbosa AO. An initial investigation of the electrochemical dissolution of fragments of nickel-titanium endodontic files. J Endod, 2011;37:526-530.10.1016/j.joen.2010.12.01421419303]Search in Google Scholar
[52. Aboud LR, Ormiga F, Gomes JA. Electrochemical induced dissolution of fragments of nickel-titanium endodontic files and their removal from simulated root canals. Int Endod J, 2014;47:155-162.10.1111/iej.1212623659794]Search in Google Scholar
[53. Kowalczuck A, Silva Neto UX, Fariniuk LF, Westphalen VPD, Laurindo CAH, Carneiro E. Electrochemical dissolution of fractured nickel-titanium instruments in human extracted teeth. Int Endod J, 2017;50:578-585.10.1111/iej.1265427101226]Search in Google Scholar
[54. Amaral CC, Ormiga F, Gomes JA. Electrochemical-induced dissolution of stainless steel files. Int Endod J, 2015;48:137-144.10.1111/iej.1229224702197]Search in Google Scholar
[55. Mitchell Q, Jeansonne BG, Stoute D, Lallier TE. Electrochemical dissolution of nickel-titanium endodontic files induces periodontal ligament cell death. J Endod, 2013;39:679-684.10.1016/j.joen.2012.12.01323611390]Search in Google Scholar
[56. Ward JR, Parashos P, Messer HH. Evaluation of an ultrasonic technique to remove fractured rotary nickel-titanium endodontic instruments from root canals: an experimental study. J Endod, 2003;29:756-763.10.1097/00004770-200311000-0001714651285]Search in Google Scholar
[57. Souter NJ, Messer HH. Complications associated with fractured file removal using an ultrasonic technique. J Endod, 2005;31:450-452.10.1097/01.don.0000148148.98255.1515917685]Search in Google Scholar
[58. Terauchi Y, O’Leary L, Kikuchi I, Asanagi M, Yoshioka T, Kobayashi C, et al. Evaluation of the efficiency of a new file removal system in comparison with two conventional systems. J Endod, 2007;33:585-588.10.1016/j.joen.2006.12.01817437878]Search in Google Scholar
[59. Alomairy KH. Evaluating two techniques on removal of fractured rotary nickel-titanium endodontic instruments from root canals: an in vitro study. J Endod, 2009;35:559-562.10.1016/j.joen.2008.12.01919345805]Search in Google Scholar
[60. Gencoglu N, Helvacioglu D. Comparison of the different techniques to remove fractured endodontic instruments from root canal systems. Eur J Dent, 2009;3:90-95.10.1055/s-0039-1697413]Search in Google Scholar
[61. Shahabinejad H, Ghassemi A, Pishbin L, Shahravan A. Success of ultrasonic technique in removing fractured rotary nickel-titanium endodontic instruments from root canals and its effect on the required force for root fracture. J Endod, 2013;39:824-828.10.1016/j.joen.2013.02.00823683286]Search in Google Scholar
[62. Garg H, Grewal MS. Cone-beam computed tomography volumetric analysis and comparison of dentin structure loss after retrieval of separated instrument by using ultrasonic EMS and ProUltra tips. J Endod, 2016;42:1693-1698.10.1016/j.joen.2016.06.01627637461]Search in Google Scholar
[63. Gerek M, Başer ED, Kayahan MB, Sunay H, Kaptan RF, Bayırlı G. Comparison of the force required to fracture roots vertically after ultrasonic and Masserann removal of broken instruments. Int Endod J, 2012;45:429-434.10.1111/j.1365-2591.2011.01993.x22188327]Search in Google Scholar
[64. Madarati AA, Qualtrough AJ, Watts DC. Effect of retained fractured instruments on tooth resistance to vertical fracture with or without attempt at removal. Int Endod J, 2010;43:1047-1053.10.1111/j.1365-2591.2010.01783.x20726909]Search in Google Scholar
[65. Madarati AA, Qualtrough AJ, Watts DC. A microcomputed tomography scanning study of root canal space: changes after the ultrasonic removal of fractured files. J Endod, 2009;35:125-128.10.1016/j.joen.2008.10.00519084141]Search in Google Scholar
[66. Madarati AA, Qualtrough AJ, Watts DC. Vertical fracture resistance of roots after ultrasonic removal of fractured instruments. Int Endod J, 2010;43:424-429.10.1111/j.1365-2591.2010.01698.x20518936]Search in Google Scholar
[67. Fu M, Zhang Z, Hou B. Removal of broken files from root canals by using ultrasonic techniques combined with dental microscope: a retrospective analysis of treatment outcome. J Endod, 2011;37:619-622.10.1016/j.joen.2011.02.016]Search in Google Scholar
[68. Madarati AA, Qualtrough AJ, Watts DC. Endodontists experience using ultrasonics for removal of intra-canal fractured instruments. Int Endod J, 2010;43:301-305.10.1111/j.1365-2591.2009.01680.x]Search in Google Scholar
[69. Gao Y, Shen Y, Zhou X, Haapasalo M. Remaining root dentin thickness in mesiobuccal canals of maxillary first molars after attempted removal of broken instrument fragments. Aust Endod J, 2015;41:122-127.10.1111/aej.12103]Search in Google Scholar
[70. Atrizadeh F, Kennedy J, Zander H. Ankylosis of teeth following thermal injury. J Periodontal Res, 1971; 6:159-167.10.1111/j.1600-0765.1971.tb00604.x]Search in Google Scholar
[71. Eriksson AR, Albrektsson T. Temperature threshold levels for heat-induced bone tissue injury: a vital-microscopic study in the rabbit. J Prosthet Dent. 1983; 50:101-7.10.1016/0022-3913(83)90174-9]Search in Google Scholar
[72. Saunders EM, Saunders WP. The heat generated on the external root surface during post space preparation. Int Endod J, 1989;22:169-173.10.1111/j.1365-2591.1989.tb00919.x2700182]Search in Google Scholar
[73. Saunders EM: In vivo findings associated with heat generation during thermomechanical compaction of gutta-percha. 2. Histological response to temperature elevation on the external surface of the root. Int Endod J, 1990;23:268-274.10.1111/j.1365-2591.1990.tb00860.x2098344]Search in Google Scholar
[74. Line SE, Polson AM, Zander HA. Relationship between periodontal injury, selective cell repopulation and ankylosis. J Periodontol, 1974;45:725-730.10.1902/jop.1974.45.10.7254215878]Search in Google Scholar
[75. Dominici JT, Clark S, Scheetz J, Eleazer PD. Analysis of heat generation using ultrasonic vibration for post removal. J Endod, 2005;31:301-303.10.1097/01.don.0000140573.72922.c915793389]Search in Google Scholar
[76. Budd JC, Gekelman D, White JM. Temperature rise of the post and on the root surface during ultrasonic post removal. Int Endod J, 2005;38:705-711.10.1111/j.1365-2591.2005.01002.x16164684]Search in Google Scholar
[77. Gluskin AH, Ruddle CJ, Zinman EJ. Thermal injury through intraradicular heat transfer using ultrasonic devices: precautions and practical preventive strategies. J Am Dent Assoc, 2005;136:1286-1293.10.14219/jada.archive.2005.0346]Search in Google Scholar
[78. Huttula AS, Tordik PA, Imamura G, Eichmiller FC, McClanahan SB. The effect of ultrasonic post instrumentation on root surface temperature. J Endod, 2006;32:1085-1087.10.1016/j.joen.2006.05.005]Search in Google Scholar
[79. Hashem AA. Ultrasonic vibration: temperature rise on external root surface during broken instrument removal. J Endod, 2007;33:1070-1073.10.1016/j.joen.2007.06.005]Search in Google Scholar
[80. Madarati AA, Qualtrough AJ, Watts DC. Factors affecting temperature rise on the external root surface during ultrasonic retrieval of intracanal separated files. J Endod, 2008;34:1089-1092.10.1016/j.joen.2008.05.018]Search in Google Scholar
[81. Madarati AA, Qualtrough AJ, Watts DC. Efficiency of a newly designed ultrasonic unit and tips in reducing temperature rise on root surface during the removal of fractured files. J Endod, 2009;35:896-899.10.1016/j.joen.2009.03.051]Search in Google Scholar
[82. Gaffney JL, Lehman JW, Miles MJ. Expanded use of the ultrasonic scaler. J Endod, 1981;7:228-229.10.1016/S0099-2399(81)80180-X]Search in Google Scholar
[83. Hulsmann M. Methods for removing metal obstruction from the root canal. Endod Dent Traumatol, 1993;9:223-237.10.1111/j.1600-9657.1993.tb00278.x]Search in Google Scholar
[84. Zuckerman O, Katz A, Pilo R, Tamse A, Fuss Z. Residual dentin thickness in mesial roots of mandibular molars prepared with Lightspeed rotary instruments and Gates-Glidden reamers. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2003;96:351-355.10.1016/S1079-2104(02)91710-5]Search in Google Scholar
[85. Kuttler S, McLean A, Dorn S, Fischzang A. The impact of post space preparation with Gates-Glidden drills on residual dentin thickness in distal roots of mandibular molars. J Am Dent Assoc, 2004;135:903-909.10.14219/jada.archive.2004.033615354901]Search in Google Scholar
[86. Wu MK, van der Sluis LW, Wesselink PR. The risk of furcal perforation in mandibular molars using Gates-Glidden drills with anticurvature pressure. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2005;99:378-382.10.1016/j.tripleo.2004.07.00815716849]Search in Google Scholar
[87. Tilk MA, Lommel TJ, Gerstein H. A study of mandibular and maxillary root widths to determine dowel size. J Endod, 1979;5:79-82.10.1016/S0099-2399(79)80153-3]Search in Google Scholar
[88. Raiden G, Koss S, Costa L, Hernandez JL. Radiographic measurement of residual root thickness in premolars with post preparation. J Endod, 2001;27:296-298.10.1097/00004770-200104000-00017]Search in Google Scholar
[89. Yang Q, Cheung GS, Shen Y, Huang D, Zhou X, Gao Y. The remaining dentin thickness investigation of the attempt to remove broken instrument from mesiobuccal canals of maxillary first molars with virtual simulation technique. BMC Oral Health, 2015; DOI 10.1186/s12903-015-0075-x10.1186/s12903-015-0075-x]Open DOISearch in Google Scholar
[90. Iqbal MK, Rafailov H, Kratchman SI, Karabucak B. A comparison of three methods for preparing centered platforms around separated instruments in curved canals. J Endod, 2006;32:48-51.10.1016/j.joen.2005.10.015]Search in Google Scholar
[91. Hulsmann M. Removal of fractured instruments using a combined automated ultrasonic technique. J Endod, 1994;20:144-147.10.1016/S0099-2399(06)80062-2]Search in Google Scholar
[92. Madarati AA, Qualtrough AJ, Watts DC. Endodontists experience using ultrasonics for removal of intra-canal fractured instruments. Int Endod J, 2010;43:301-305.10.1111/j.1365-2591.2009.01680.x20487449]Search in Google Scholar
[93. Strindberg LZ. The dependence of the results of pulp therapy on certain factors:an analysis study based on radiographic and clinical follow up examination. Acta Odontol Scand, 1956; 14:1-175.]Search in Google Scholar
[94. Sigurdsson A. Evaluation of success and failure. In: Walton R, Torabinejad M, editor. Priciples and Practice of Endodontics. Philadelphia: W.B. Saunders Company; 2002. p. 331-344.]Search in Google Scholar
[95. Simon S, Machtou P, Tomson P, Adams N, Lumley P. Influence of fractured instruments on the success rate of endodontic treatment. Dent Update. 2008; 35:172-9.10.12968/denu.2008.35.3.17218507225]Search in Google Scholar
[96. Panitvisai P, Parunnit P, Sathorn C, Messer HH. Impact of a retained instrument on treatment outcome: a systematic review and meta-analysis. J Endod, 2010; 36:775-780.10.1016/j.joen.2009.12.02920416418]Search in Google Scholar