CC BY-NC-ND 4.0 · Eur J Dent 2013; 07(S 01): S041-S044
DOI: 10.4103/1305-7456.119070
Original Article
Dental Investigation Society

Evaluation of the apical adaptation performance of various root canal instruments

K. Tolga Ceyhanli
1   Department of Endodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkiye
Murat Turkun
2   Department of Restorative Dentistry, Faculty of Dentistry, Ege University, Izmir, Turkiye
Necdet Erdilek
3   Department of Endodontics, Faculty of Dentistry, Ege University, Izmir, Turkiye
Cem Peskersoy
2   Department of Restorative Dentistry, Faculty of Dentistry, Ege University, Izmir, Turkiye
Timur Kose
4   Department of Biostatistics and Medical Informatics, Faculty of Medicine, Izmir, Turkiye
› Author Affiliations
Further Information

Publication History

Publication Date:
25 September 2019 (online)


Objective: The aim of this study was to evaluate the apical root canal adaptation performance of various root canal instruments. Materials and Methods: A total of 40 freshly extracted single-rooted mandibular incisors were used in this study. Coroner parts of all teeth were removed from cemento-enamel junction and root canal of each tooth was explored with a size 8 K-file until the tip of the file was just visible at the apex. Working lengths (WLs) were determined as 1 mm short of these measurements. ProTaper, K-file, profile and hedstroem files were inserted into the root canals of 10 teeth to the WL following the flaring of the coronal and middle thirds. Instruments were fixed in the root canals with acrylic resin. The apical 1 mm of each root tip was ground on wet sandpaper to expose the canal and the instrument at the WL and the apical region of each tooth was examined under stereomicroscope. The stereoscopic images of the teeth were digitized and analyzed with software in order to determine the differences between the areas of root canals and file tips. Result data were analyzed using the one-way analysis of variance test (p = 0.05). Results: There were no significant differences between apical file/root canal areas of the evaluated instruments (p > 0.05). Conclusions: None of the evaluated instruments performed a perfect adaptation with the apical root canal surface at the WL in mandibular incisors. Therefore, total removal of the debris from the apical canal surface may not be achieved when these filing instruments are used.


  • 1 Armitage JP, Evans MC. The motile and tactic behaviour of Pseudomonas aeruginosa in anaerobic environments. FEBS Lett 1983; 156: 113-8
  • 2 Ando N, Hoshino E. Predominant obligate anaerobes invading the deep layers of root canal dentin. Int Endod J 1990; 23: 20-7
  • 3 Peters OA, Schönenberger 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
  • 4 Nair PN, Sjögren U, Krey G, Kahnberg KE, Sundqvist G. Intraradicular bacteria and fungi in root-filled, asymptomatic human teeth with therapy-resistant periapical lesions: A long-term light and electron microscopic follow-up study. J Endod 1990; 16: 580-8
  • 5 Lussi A, Portmann P, Nussbächer U, Imwinkelried S, Grosrey J. Comparison of two devices for root canal cleansing by the noninstrumentation technology. J Endod 1999; 25: 9-13
  • 6 Hand RE, Smith ML, Harrison JW. Analysis of the effect of dilution on the necrotic tissue dissolution property of sodium hypochlorite. J Endod 1978; 4: 60-4
  • 7 Lumley PJ, Walmsley AD, Walton RE, Rippin JW. Cleaning of oval canals using ultrasonic or sonic instrumentation. J Endod 1993; 19: 453-7
  • 8 Jou YT, Karabucak B, Levin J, Liu D. Endodontic working width: Current concepts and techniques. Dent Clin North Am 2004; 48: 323-35
  • 9 Weine FS. The use of non-ISO-tapered instruments for canal flaring. Compend Contin Educ Dent 1996; 17: 651-6, 658
  • 10 Grande NM, Plotino G, Pecci R, Bedini R, Pameijer CH, Somma F. Micro-computerized tomographic analysis of radicular and canal morphology of premolars with long oval canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008; 106: e70-6
  • 11 Silveira LF, Martos J, Pintado LS, Teixeira RA, César Neto JB. Early flaring and crown-down shaping influences the first file bind to the canal apical third. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008; 106: e99-101
  • 12 Wu MK, Wesselink PR, Walton RE. Apical terminus location of root canal treatment procedures. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2000; 89: 99-103
  • 13 Martos J, Ferrer-Luque CM, González-Rodríguez MP, Castro LA. Topographical evaluation of the major apical foramen in permanent human teeth. Int Endod J 2009; 42: 329-34
  • 14 Tan BT, Messer HH. The effect of instrument type and preflaring on apical file size determination. Int Endod J 2002; 35: 752-8
  • 15 Contreras MA, Zinman EH, Kaplan SK. Comparison of the first file that fits at the apex, before and after early flaring. J Endod 2001; 27: 113-6
  • 16 Senia ES. Canal diameter: The forgotten dimension. Dent Today 2001; 20: 58-62
  • 17 Peters OA. Current challenges and concepts in the preparation of root canal systems: A review. J Endod 2004; 30: 559-67
  • 18 Boruah LC, Bhuyan AC. Morphologic characteristics of root canal of mandibular incisors in North-East Indian population: An in vitro study. J Conserv Dent 2011; 14: 346-50
  • 19 Huang DM, Hao YQ, Luo SG, Jia LH, Zhou XD. Morphology of cross-sectioned root canal in Chinese mandibular permanent incisors. Sichuan Da Xue Xue Bao Yi Xue Ban 2006; 37: 916-8
  • 20 Kartal N, Yanikoðlu FC. Root canal morphology of mandibular incisors. J Endod 1992; 18: 562-4
  • 21 Mauger MJ, Schindler WG, Walker 3 rd WA. An evaluation of canal morphology at different levels of root resection in mandibular incisors. J Endod 1998; 24: 607-9
  • 22 Weiger R, Bartha T, Kalwitzki M, Löst C. A clinical method to determine the optimal apical preparation size. Part I. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2006; 102: 686-91
  • 23 Schneider SW. A comparison of canal preparations in straight and curved root canals. Oral Surg Oral Med Oral Pathol 1971; 32: 271-5
  • 24 Vasconcelos BC, Matos LdeA, Pinheiro-Júnior EC, Menezes AS, Vivacqua-Gomes N. Ex vivo accuracy of three electronic apex locators using different apical file sizes. Braz Dent J 2012; 23: 199-204
  • 25 Comin ChiaramontiL, Menini M, Cavalleri G. A comparison between two fourth generation apex locators. Minerva Stomatol 2012; 61: 183-96
  • 26 Mancini M, Felici R, Conte G, Costantini M, Cianconi L. Accuracy of three electronic apex locators in anterior and posterior teeth: An ex vivo study. J Endod 2011; 37: 684-7
  • 27 Wu MK, Barkis D, Roris A, Wesselink PR. Does the first file to bind correspond to the diameter of the canal in the apical region?. Int Endod J 2002; 35: 264-7
  • 28 Kast’áková A, Wu MK, Wesselink PR. An in vitro experiment on the effect of an attempt to create an apical matrix during root canal preparation on coronal leakage and material extrusion. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2001; 91: 462-7
  • 29 Usman N, Baumgartner JC, Marshall JG. Influence of instrument size on root canal debridement. J Endod 2004; 30: 110-2
  • 30 Rollison S, Barnett F, Stevens RH. Efficacy of bacterial removal from instrumented root canals in vitro related to instrumentation technique and size. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2002; 94: 366-71
  • 31 Shuping GB, Orstavik D, Sigurdsson A, Trope M. Reduction of intracanal bacteria using nickel-titanium rotary instrumentation and various medications. J Endod 2000; 26: 751-5
  • 32 Dalton BC, Orstavik D, Phillips C, Pettiette M, Trope M. Bacterial reduction with nickel-titanium rotary instrumentation. J Endod 1998; 24: 763-7
  • 33 Iqbal MK, Ku J. Instrumentation and obturation of the apical third of root canals: Addressing the forgotten dimension. Compend Contin Educ Dent 2007; 28: 314-20
  • 34 de Oliveira LD, Carvalho CA, Valera MC, Koga-Ito CY, Jorge AO. Diffusion ability of endotoxin through dentinal tubules. Braz Oral Res 2005; 19: 5-10