| [1] | 
																						 
											 Vire D E.Failure of endodontically treated teeth: Classification and evaluation[J].Journal of Endodontics, 1991, 17(7):338-342
											 											 | 
										
																													
																						| [2] | 
																						 
											 Fuss Z, Lustig J, Tamse A.Prevalence of vertical root fractures in extracted endodontically treated teeth[J].International Endodontic Journal, 2010, 32(4):283-286
											 											 | 
										
																													
																						| [3] | 
																						 
											 Zadik Y, Sandler V, Bechor R, Salehrabi R.Analysis of factors related to extraction of endodontically treated teeth.[J].Oral Surgery Oral Medicine Oral Pathology Oral Radiology & Endodontology, 2008, 106(5):31-35
											 											 | 
										
																													
																						| [4] | 
																						 
											 Sorensen J A, Martinoff J T.Intracoronal reinforcement and coronal coverage: a study of endodontically treated teeth[J].Journal of Prosthetic Dentistry, 1984, 51(6):780-784
											 											 | 
										
																													
																						| [5] | 
																						 
											 Kishen A.Mechanisms and risk factors for fracture predilection in endodontically treated teeth[J].Endodontic Topics, 2010, 13(1):57-83
											 											 | 
										
																													
																						| [6] | 
																						 
											 Arola D, Ivancik J, Majd H, et al.Microstructure and mechanical behavior of radicular and coronal dentin[J].Endodontic Topics, 2012, 20(1):30-51
											 											 | 
										
																													
																						| [7] | 
																						 
											 Clark D, Khademi J.Modern molar endodontic access and directed dentin conservation[J].Dental Clinics of North America, 2010, 54(2):275-289
											 											 | 
										
																													
																						| [8] | 
																						 
											 Gluskin A H, Peters C I, Peters O A.Minimally invasive endodontics: challenging prevailing paradigms[J].British Dental Journal, 2014, 216(6):347-353
											 											 | 
										
																													
																						| [9] | 
																						 
											 蒋宏伟.微创牙髓治疗的理论与实践[J].中华口腔医学杂志, 2016, 51(8):460-464
											 											 | 
										
																													
																						| [10] | 
																						 
											 吴补领, 陈明.微创根管治疗术[J].口腔疾病防治, 2017, 25(2):69-73
											 											 | 
										
																													
																						| [11] | 
																						 
											 Borcic J, Anic I, Smojver I, et al.D finite element model and cervical lesion formation in normal occlusion and in malocclusion[J].Journal of Oral Rehabilitation, 2010, 32(7):504-510
											 											 | 
										
																													
																						| [12] | 
																						 
											 Yuan K, Niu C, Xie Q, et al.Comparative evaluation of the impact of minimally invasive preparation vsconventional straight‐line preparation on tooth biomechanics: a finite element analysis[J].European Journal of Oral Sciences, 2016, 124(6):591-596
											 											 | 
										
																													
																						| [13] | 
																						 
											 Krishan R, Paqué F, Ossareh A, et al.Impacts of conservative endodontic cavity on root canal instrumentation efficacy and resistance to fracture assessed in incisors,premolars,and molars[J].Journal of Endodontics, 2014, 40(8):1160-1166
											 											 | 
										
																													
																						| [14] | 
																						 
											 Dejak B, M?otkowski A, Romanowicz M.Finite element analysis of stresses in molars during clenching and mastication[J].Journal of Prosthetic Dentistry, 2003, 90(6):591-597
											 											 | 
										
																													
																						| [15] | 
																						 
											 Habelitz S, Marshall S J, Jr G W M, et al.Mechanical properties of human dental enamel on the nanometre scale[J].Archives of Oral Biology, 2001, 46(2):173-183
											 											 | 
										
																													
																						| [16] | 
																						 
											 Kinney J H .The Mechanical Properties of Human Dentin, A Critical Review and Re-evaluation of the Dental Literature[J].Clit. Rev. Oral Biol. Med., 2003, 14(1):13-29
											 											 | 
										
																													
																						| [17] | 
																						 
											 Kar S, Tripathi A, Trivedi C.Effect of Different Ferrule Length on Fracture Resistance of Endodontically Treated Teeth: An In vitro Study[J].Journal of Clinical & Diagnostic Research Jcdr, 2017, 11(4):Z-C49
											 											 | 
										
																													
																						| [18] | 
																						 
											 Stankiewicz N R, Wilson P R.The ferrule effect: a literature review[J].International Endodontic Journal, 2010, 35(7):575-581
											 											 | 
										
																													
																						| [19] | 
																						 
											 Ng C C H, Albayat M I, Dumbrigue H B, et al.Effect of no ferrule on failure of teeth restored with bonded posts and cores[J].General Dentistry, 2004, 52(2):143-146
											 											 | 
										
																													
																						| [20] | 
																						 
											 Mamoun J S.On the ferrule effect and the biomechanical stability of teeth restored with cores,posts,and crowns[J].European Journal of Dentistry, 2014, 8(2):281-286
											 											 | 
										
																													
																						| [21] | 
																						 
											 Juloski J, Radovic I, Goracci C, et al.Ferrule Effect: A Literature Review[J].Journal of Endodontics, 2012, 38(1):11-19
											 											 | 
										
																													
																						| [22] | 
																						 
											 Plotino G, Grande N M, Isufi A, et al.Fracture Strength of Endodontically Treated Teeth with Different Access Cavity Designs[J].Journal of Endodontics, 2017, 43(6):995-1000
											 											 | 
										
																													
																						| [23] | 
																						 
											 Silva E J N L, Rover G, Belladonna F G, et al.Impact of contracted endodontic cavities on fracture resistance of endodontically treated teeth: a systematic review of in vitro studies[J].Clinical Oral Investigations, 2017, 22(1):109-118
											 											 | 
										
																													
																						| [24] | 
																						 
											 Rover G, Felipe Gon?alves Belladonna, Bortoluzzi E A, et al.Influence of Access Cavity Design on Root Canal Detection,Instrumentation Efficacy,and Fracture Resistance Assessed in Maxillary Molars[J].Journal of endodontics, 2017, 43(10):1657-1662
											 											 | 
										
																													
																						| [25] | 
																						 
											 zyürek T, ? ülker, Demiryürek E ?, et al.The Effects of Endodontic Access Cavity Preparation Design on the Fracture Strength of Endodontically Treated Teeth: Traditional Versus Conservative Preparation[J].Journal of Endodontics, 2018, 44(5):800-805
											 											 | 
										
																													
																						| [26] | 
																						 
											 Clark D, Khademi J A.Case Studies in Modern Molar Endodontic Access and Directed Dentin Conservation[J].Dent Clin North Am, 2010, 54(2):275-289
											 											 | 
										
																													
																						| [27] | 
																						 
											 樊明文.牙体牙髓病学[M].4版.北京:人民卫生出版社, 2012:279.
											 											 | 
										
																													
																						| [28] | 
																						 
											 Gutmann J L.Minimally invasive dentistry (Endodontics)[J].Journal of Conservative Dentistry Jcd, 2013, 16(4):282-283
											 											 | 
										
																													
																						| [29] | 
																						 
											 Willershausen B, Kasaj A, R?hrig B, et al.Radiographic investigation of frequency and location of root canal curvatures in human mandibular anterior incisors in vitro[J].Journal of Endodontics, 2008, 34(2):152-156
											 											 | 
										
																													
																						| [30] | 
																						 
											 Khullar K D, Singh D.Cone beam computed tomography in endodontics[J].International Endodontic Journal, 2015, 48(1):3-15
											 											 | 
										
																													
																						| [31] | 
																						 
											 Sinanoglu A, Helvacioglu-Yigit D, Mutlu I.Use of cone-beam computed tomography and three-dimensional modeling for assessment of anomalous pulp canal configuration: a case report[J].Restorative Dentistry & Endodontics, 2015, 40(2):161-165
											 											 | 
										
																													
																						| [32] | 
																						 
											 Gambarini G, Ropini P, Piasecki L, et al.A preliminary assessment of a new dedicated endodontic software for use with CBCT images to evaluate the canal complexity of mandibular molars[J].International Endodontic Journal, 2018, 51(3):259-268
											 											 | 
										
																													
																						| [33] | 
																						 
											 Connert T, Zehnder M S, Weiger R, et al.Microguided Endodontics: Accuracy of a Miniaturized Technique for Apically Extended Access Cavity Preparation in Anterior Teeth[J].Journal of Endodontics, 2017, 43(5):787-790
											 											 | 
										
																													
																						| [34] | 
																						 
											 Lara-Mendes S T D O, Barbosa C D F M, Santa-Rosa C C, et al.Guided Endodontic Access in Maxillary Molars Using Cone-beam Computed Tomography and Computer-aided Design/Computer-aided Manufacturing System: A Case Report[J].Journal of Endodontics, 2018, 44(5):875-879
											 											 | 
										
																													
																						| [35] | 
																						 
											 Silva E, Vieira V, Belladonna F G, et al.Cyclic and Torsional Fatigue Resistance of XP-endo Shaper and TRUShape Instruments[J].J Endod, 2018, 44(1):168-172
											 											 | 
										
																													
																						| [36] | 
																						 
											 Testarelli L, Plotino G, Al-Sudani D, et al.Bending Properties of a New Nickel-Titanium Alloy with a Lower Percent by Weight of Nickel[J].Journal of Endodontics, 2011, 37(9):1293-1295
											 											 |