This study evaluates whether endodontic cavity access into molars influences the chemomechanical preparation of curved root canals.
Materials and methods
Twenty mesiobuccal canals of maxillary molars were randomly divided into two experimental groups (n = 10), according to the type of endodontic access analyzed (conventional and minimally invasive). The preparations were made by a single operator, and the canals, after access, were prepared with Logic system (0.25, 0.04 taper) along the working length. Samples were scanned before and after canal preparation (SMX-90CT Plus (Shimadzu® microtomograph operated with 70 kV, 100 uA, FOV (XY) 13.3 mm, FOV (Z) 7.0 mm, and voxel size 0.013 mm/Pix)) to match canal volumes. Images were analyzed to evaluate surface areas, transport, and centralization at 3 mm from the canal entrance and 3 mm from the apex (OnDemand3DTM Dental software). Student’s t test with a significance level of 5% was used for the statistical analysis.
Regardless of the position of the analyzed canals, there was no difference in the prepared area regarding the transport and centralization of the endodontic instrument between the two types of cavity accesses performed.
The conventional and minimally invasive access did not influence the action of the 0.25 and 0.04 taper instrument during the curved root canal preparation.
The type of endodontic access did not influence the action of the rotary instrument during the curved root canal preparation.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
Tax calculation will be finalised during checkout.
Sabeti M, Kazem M, Dianat O, Bahrololumi N, Beglou A, Rahimipour K, Dehnavi F (2018) Impact of access cavity design and root canal taper on fracture resistance of endodontically treated teeth: an ex vivo investigation. J Endod 44(9):1402–1406. https://doi.org/10.1016/j.joen.2018.05.006
Schroeder KP, Walton RE, Rivera EM (2002) Straight line access and coronal flaring: effect on canal length. J Endod 28(6):474–476
Patel S, Rhodes J (2007) A practical guide to endodontic access cavity preparation in molar teeth. Br Dent J 203(3):133–140
Tang W, Wu Y, Smales RJ (2010) Identifying and reducing risks for potential fractures in endodontically treated teeth. J Endod 36(4):609–617. https://doi.org/10.1016/j.joen.2009.12.002
Lang H, Korkmaz Y, Schneider K, Raab WH (2006) Impact of endodontic treatments on the rigidity of the root. J Dent Res 85(4):364–368
Gluskin AH, Peters CI, Peters OA (2014) Minimally invasive endodontics: challenging prevailing paradigms. Br Dent J 216(6):347–353. https://doi.org/10.1038/sj.bdj.2014.201
Bürklein S, Shäfer E (2015) Minimally invasive endodontics. Quintessence Int 46(2):119–124. https://doi.org/10.3290/j.qi.a33047
Krishan R, Paque F, Ossareh A, Kishen A, Dao T, Friedman S (2014) Impacts of conservative endodontic cavity on root canal instrumentation efficacy and resistance to fracture assessed in incisors, premolars, and molars. J Endod 40(8):1160–1166. https://doi.org/10.1016/j.joen.2013.12.012
Gergi R, Rjeily JA, Sader J, Naaman A (2010) Comparison of canal transportation and centering ability of Twisted files, Pathfile-ProTaper system, and stainless steel hand K-files by using computed tomography. J Endod 36(5):904–907. https://doi.org/10.1016/j.joen.2009.12.038
Alovisi M, Pasqualini D, Musso E, Bobbio E, Giuliano C, Mancino D, Scotti N, Berutti E (2018) Influence of contracted endodontic access on root canal geometry: an in vitro study. J Endod 44(4):614–620. https://doi.org/10.1016/j.joen.2017.11.010
Bürklein S, Schäfer E (2013) Critical evaluation of root canal transportation by instrumentation. Endod Top 29(1):110–124
Elnaghy AM, Elsaka SE (2014) Evaluation of root canal transportation, centering ratio, and remaining dentin thickness associated with ProTaper Next instruments with and without glide path. J Endod 40(12):2053–2056. https://doi.org/10.1016/j.joen.2014.09.001
Schneider SW (1971) A comparison of canal preparation in straight and curved root canal. Oral Surg Oral Med Oral Pathol 32(2):271–275
Pruett JP, Clement DJ, Carnes-Jr DL (1997) Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 23(2):77–85
Moore B, Verdelis K, Kishen A, Dao T, Friedman S (2016) Impacts of contracted endodontic cavities on instrumentation efficacy and biomechanical responses in maxillary molars. J Endod 42(12):1779–1783. https://doi.org/10.1016/j.joen.2016.08.028
Torabinejad M, Walton RE (2010) Endodontia: princípios e práticas. In: Johnson WT, Williamson AE (eds) Isolamento, Abertura Coronária e Determinação do comprimento. Elsevier Editora Ltda, Rio de Janeiro, pp 236–239
Clark D, Khademi J (2010) Modern molar endodontic access and directed dentin conservation. Dent Clin N Am 54(2):249–273. https://doi.org/10.1016/j.cden.2010.01.001
Gambill JM, Alder M, del Rio CE (1996) Comparison of nickel-titanium and stainless steel hand-file instrumentation using computed tomography. J Endod 22(7):369–375
Pereira JR, McDonald A, Petrie A, Knowles JC (2013) Effect of cavity design on tooth surface strain. J Prosthet Dent 110(5):369–375. https://doi.org/10.1016/j.prosdent.2013.08.004
Plotino G, Grande NM, Isufi A, Ioppolo P, Pedullà E, Bedini R, Gambarini G, Testarelli L (2017) Fracture strength of endodontically treated teeth with different access cavity designs. J Endod 43(6):995–1000. https://doi.org/10.1016/j.joen.2017.01.022
Versiani MA, Pascon EA, de Sousa CJ, Borges MA, Sousa-Neto MD (2008) Influence of shaft design on the shaping ability of 3 nickel-titanium rotary systems by means of spiral computerized tomography. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 105(6):807–813. https://doi.org/10.1016/j.tripleo.2007.12.012
Bürklein S, Hiller C, Huda M, Schäfer E (2011) Shaping ability and cleaning effectiveness of Mtwo versus coated and uncoated EasyShape instruments in severely curved root canals of extracted teeth. Int Endod J 44(5):447–457. https://doi.org/10.1111/j.1365-2591.2011.01850.x
Bürklein S, Hinschitza K, Dammaschke T, Schäfer E (2012) Shaping ability and cleaning effectiveness of two single-file systems in severely curved root canals of extracted teeth: Reciproc and WaveOne versus Mtwo and ProTaper. Int Endod J 45(5):449–461. https://doi.org/10.1111/j.1365-2591.2011.01996.x
Lopes HP, Elias CN, Estrela C, Siqueira JF Jr (1998) Assessment of the apical transportation of root canals using the method of the curvature radius. Braz Dent J 9(1):39–45
Saberi N, Patel S, Mannocci F (2017) Comparison of centring ability and transportation between four nickel titanium instrumentation techniques by micro-computed tomography. Int Endod J 50(6):595–603. https://doi.org/10.1111/iej.12658
Silva EJNL, Pacheco PT, Pires F, Belladonna FG, De-Deus G (2017) Microcomputed tomographic evaluation of canal transportation and centring ability of ProTaper Next and Twisted File Adaptive systems. Int Endod J 50(7):694–699. https://doi.org/10.1111/iej.12667
Peters OA, Morgental RD, Schulze KA, Paqué F, Kopper PM, Vier-Pelisser FV (2014) Determining cutting efficiency of nickel-titanium coronal flaring instruments used in lateral action. Int Endod J 47(6):505–513. https://doi.org/10.1111/iej.12177
Antunes HS, Rôças IN, Alves FR, Siqueira JF Jr (2015) Total and specific bacterial levels in the apical root canal system of teeth with post-treatment apical periodontitis. J Endod 41(7):1037–1042. https://doi.org/10.1016/j.joen.2015.03.008
Wu MK, Fan B, Wesselink PR (2000) Leakage along apical root fillings in curved canals. Part I. Effects of apical transportation on seal of root fillings. J Endod 26(4):210–216
Wu MK, R’oris A, Barkis D, Wesselink PR (2000) Prevalence and extent of long oval canals in the apical third. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 89(6):739–743
Eaton JA, Clement DJ, Lloyd A, Marchesan MA (2015) Micro-computed tomographic evaluation of the influence of root canal system landmarks on access outline forms and canal curvatures in mandibular molars. J Endod 41(11):1888–1891. https://doi.org/10.1016/j.joen.2015.08.013
Harris SP, Bowles WR, Fok A, McClanahan SB (2013) An anatomic investigation of the mandibular first molar using micro-computed tomography. J Endod 39(11):1374–1378. https://doi.org/10.1016/j.joen.2013.06.034
Schäfer E, Dammaschke T (2006) Development and sequelae of canal transportation. Endod Top 15(1):75–90
Khademi A, Yazdizadeh M, Feizianfard M (2006) Determination of the minimum instrumentation size for penetration of irrigants to the apical third of root canal systems. J Endod 32(5):417–420
Wu MK, Wesselink PR (1995) Efficacy of three techniques in cleaning the apical portion of curved root canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 79(4):492–496
Barbizam JVB, Farinuk LF, Marchesan MA, Pecora JD, Sousa-Neto MD (2002) Effectiveness of manual and rotatory instrumentation techniques for cleaning flattened root canals. J Endod 28(5):365–366
Pinheiro SR, Alcalde MP, Vivacqua-Gomes N, Bramante CM, Vivan RR, Duarte MAH, Vasconcelos BC (2018) Evaluation of apical transportation and centring ability of five thermally treated NiTi rotary systems. Int Endod J 51(6):705–713. https://doi.org/10.1111/iej.12881
Bürklein S, Börjes L, Schäfer E (2014) Comparison of preparation of curved root canals with Hyflex CM and Revo-S rotary nickel-titanium instruments. Int Endod J 47(5):470–476. https://doi.org/10.1111/iej.12171
Marceliano-Alves MF, Sousa-Neto MD, Fidel SR, Steier L, Robinson JP, Pécora JD, Versiani MA (2015) Shaping ability of single-file reciprocating and heat-treated multifile rotary systems: a micro-CT study. Int Endod J 48(12):1129–1136. https://doi.org/10.1111/iej.12412
The work was supported by the authors.
This study was approved by the Research Ethics Committee of the Faculty of Dentistry of UFRGS and by the Research Ethics Committee of the same institution (Process CAAE 89366618.0.0000.5347).
Conflict of interest
The authors declare that they have no competing interests.
This article does not contain any studies with human participants or animals performed by any of the authors.
For this type of study, formal consent is not required.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Freitas, G.R., Ribeiro, T.M., Vilella, F.S.G. et al. Influence of endodontic cavity access on curved root canal preparation with ProDesign Logic rotary instruments. Clin Oral Invest 25, 469–475 (2021). https://doi.org/10.1007/s00784-020-03390-6
- Endodontic access
- Minimally invasive
- Nickel-titanium instruments
- Root canal preparation
- Microcomputed tomography