Skip to main content
Key Specialties
Cardiology Diabetology Endocrinology Gastroenterology Geriatrics and Gerontology Gynecology and Obstetrics Hematology Infectious Disease Internal Medicine Nephrology Neurology Oncology Pediatrics Respiratory Medicine Rheumatology Surgery
Congress Coverage
2024 ACC Congress 2023 ESMO Congress 2023 EASD Congress 2023 ERS Congress 2023 ESC Congress
Clinical Collections
Advances in Alzheimer’s

At a glance: The ONWARDS insulin icodec trials

A round-up of the ONWARDS phase 3 clinical trials evaluating the novel weekly insulin icodec in people with diabetes.
ADVANCED SEARCH
Log in
Top
BMC Oral Health
Published in: BMC Oral Health 1/2020

01-12-2020 | Research article

Influence of cervical preflaring and root canal preparation on the fracture resistance of endodontically treated teeth

Authors: Paula Barcellos da Silva, Simone Ferreti Duarte, Murilo Priori Alcalde, Marco Antonio Húngaro Duarte, Rodrigo Ricci Vivan, Ricardo Abreu da Rosa, Marcus Vinícius Reis Só, Angela Longo do Nascimento

Published in: BMC Oral Health | Issue 1/2020

Login to get access

Abstract

Background

Evaluate the fracture resistance of endodontically treated teeth after cervical preflaring and root canal preparation and to assess the volume of the root canal and the amount of remaining root dentin before and after cervical preflaring.

Methods

Forty-four mandibular incisors were selected using micro-CT scanning and distributed into 4 groups (n = 11) according to the instrument used for cervical preflaring: control group - no cervical preflaring; Gates Glidden – burs size #2 and #3; WXN – 25.07 Navigator instrument; and Easy – 25.08 ProDesign S instrument. Coronal opening was performed, and the canals were prepared with Wave One Gold Primary and filled with an epoxy-resin based sealer and gutta-percha cones. Micro-CT scans were performed before and after root canal instrumentation. All images were reconstructed and assessed for the thickness of mesial and distal root dentin at 3 mm and 5 mm from the cement -enamel junction and for the volume of cervical portion of the canal after preparation. Fracture resistance test was performed applying compressive loads at a crosshead speed of 0.5 mm/min, applied on the palatal aspect of specimens at 135° along the long axis of the tooth. The data were analyzed using ANOVA and Tukey’s test (P = .05).

Results

Cervical preflaring and canal preparation reduced the dentin thickness (P < .05) and increased the canal volume (P < .05) in all groups at 3 mm an 5 mm. Cervical preflaring with Gates Gliden burs reduced the fracture resistance of endodontically treated teeth (P < .05).

Conclusions

All instruments reduced the dentin thickness and increased the canal volume in the cervical at 3 mm and 5 mm. Gates Glidden reduced fracture resistance of mandibular incisors submitted to cervical preflaring, whereas NiTi instruments did not.

Clinical relevance

Cervical preflaring assumes particular importance previously to the root canal preparation because it minimizes the occurrence of operative accidents, and permits more accurate determination of working length and the apical diameter.
Literature
1.
2.
Ehrhardt IC, Zuolo ML, Cunha RS, De Martin AS, Kherlakian D, Carvalho MCBC. Assessment of the separation incidence of Mtwo files used with preflaring: prospective clinical study. J Endod. 2012;38:1078–81.CrossRef
3.
Borges ÁH, Pereira TM, Porto AN, de Araújo Estrela CR, Miranda Pedro FL, Aranha AMGO. The influence of cervical preflaring on the amount of apically extruded debris after root canal preparation using different instrumentation systems. J Endod. 2016;42:465–9.CrossRef
4.
Davis RD, Marshall JGBJ. Effect of early coronal flaring on working length change in curved canals using rotary nickel-titanium versus stainless steel instruments. J Endod. 2002;28:438–42.CrossRef
5.
Sanfelice CM, da Costa FB, Reis Só MV, Vier-Pelisser F, Souza Bier CAGF. Effects of four instruments on coronal pre-enlargement by using cone beam computed tomography. J Endod. 2010;36:858–61.CrossRef
6.
Maniglia-Ferreira C, de Almeida GF, Ximenes T, Neto MAT, Arruda TE, Ribamar GGHL. Influence of reuse and cervical preflaring on the fracture strength of reciprocating instruments. Eur J Dentistry. 2017;11:41–7.CrossRef
7.
Vanni JR, Santos R, Limongi O, Guerisoli DM, Capelli APJ. Influence of cervical preflaring on determination of apical file size in maxillary molars: SEM analysis. Braz Dent J. 2005;16:181–6.CrossRef
8.
Ibelli GS, Barroso JM, Capelli A, Spanó JCPJ. Influence of cervical preflaring on apical file size determination in maxillary lateral incisors. Braz Dent J. 2007;18:102–6.CrossRef
9.
Babacar T, Babacar F, Kane AW, Lo CM, Niang B, Boucher Y. Analysis of reasons for extraction of endodontically treated teeth: a prospective study. J Endod. 2011;37 (11):1512–5.
10.
Arslan H, Karataş E, Capar ID, DE Ozsu D. Effect of ProTaper universal, Endoflare, Revo-S, HyFlex coronal flaring instruments, and gates Glidden drills on crack formation. J Endod. 2014;40:1681–3.CrossRef
11.
Barreto MS, Rosa RA, Santini MF, Cavenago BC, Duarte MA, Bier CASM. Efficacy of ultrasonic activation of NaOCl and orange oil in removing filling material from mesial canals of mandibular molars with and without isthmus. J Appl Oral Sci. 2016;24:37–44.CrossRef
12.
Krishan R, Paqué F, Ossareh A, Kishen A, Dao TFS. Impacts of conservative endodontic cavity on root canal instrumentation efficacy and resistance to fracture assessed in incisors, premolars, and molars. J Endod. 2014;40:1160–6.CrossRef
13.
Plotino G, Grande NM, Isufi A, Ioppolo P, Pedullà E, Bedini R, Gambarini G, Testarelli L. Fracture strength of endodontically treated teeth with different access cavity designs. J Endod. 2017;43(6):995–1000.
14.
Rhodes JS, Ford TR, Lynch JA, Liepins PJCR. Micro-computed tomography: a new tool for experimental endodontology. Int Endod J. 1999;32:165–70.CrossRef
15.
De-Deus G, Belladonna FG, Souza EM, Silva EJNL, de Almeida Neves A, Alves H, Tadeu Lopes R, Versiani MA. Micro–computed tomographic assessment on the effect of ProTaper next and twisted file adaptive systems on dentinal cracks. J Endod. 2015;41(7):1116–9.
16.
Flores CB, Montagner F, Gomes BP, Dotto GN, da Silva Schmitz M. Comparative assessment of the effects of gates-Glidden, largo, LA-Axxess, and new Brazilian drill CPdrill on coronal pre-enlargement: cone-beam computed tomographic analysis. J Endod. 2014;40:571–4..CrossRef
17.
Duarte MA, Bernardes RA, Ordinola-Zapata R, Vasconcelos BC, Bramante CMMI. Effects of gates-Glidden, LA Axxess and orifice shaper burs on the cervical dentin thickness and root canal area of mandibular molars. Braz Dent J. 2011;22:28–31.CrossRef
18.
Wu MK, R'oris A, Barkis D, Wesselink PR. Prevalence and extent of long oval canals in the apical third. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2000;89 (6):739–43.
19.
Pilo RTA. Residual dentin thickness in mandibular premolars prepared with gates glidden and ParaPost drills. J Prosthet Dent. 2000;83(6):617–23.
20.
Zuckerman O, Katz A, Pilo R, Tamse AFZ. 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;96:351–5.CrossRef
21.
De-Deus G, Arruda TE, Souza EM, Neves A, Magalhães K, Thuanne EFR. The ability of the Reciproc R25 instrument to reach the full root canal working length without a glide path. Int Endod J. 2013;46:993–8.CrossRef
22.
23.
Zelic K, Vukicevic A, Jovicic G, Aleksandrovic S, Filipovic NDM. Mechanical weakening of devitalized teeth: three-dimensional finite element analysis and prediction of tooth fracture. Int Endod J. 2015;48:850–63.CrossRef
Metadata
Title
Influence of cervical preflaring and root canal preparation on the fracture resistance of endodontically treated teeth
Authors
Paula Barcellos da Silva
Simone Ferreti Duarte
Murilo Priori Alcalde
Marco Antonio Húngaro Duarte
Rodrigo Ricci Vivan
Ricardo Abreu da Rosa
Marcus Vinícius Reis Só
Angela Longo do Nascimento
Publication date
01-12-2020
Publisher
BioMed Central
Published in
BMC Oral Health / Issue 1/2020
Electronic ISSN: 1472-6831
DOI
https://doi.org/10.1186/s12903-020-1050-8

Other articles of this Issue 1/2020

BMC Oral Health 1/2020 Go to the issue

Research article

Effects of two peroxide enzymatic denture cleaners on Candida albicans biofilms and denture surface

Research article

Vitamin D receptor genetic polymorphisms are associated with oral lichen planus susceptibility in a Chinese Han population

Research article

Methanandamide diminish the Porphyromonas gingivalis lipopolysaccharide induced response in human periodontal ligament cells

Research article

Gingival bleeding and calculus among 12-year-old Chinese adolescents: a multilevel analysis

Review

Effect of silver diamine fluoride solution application on the bond strength of dentine to adhesives and to glass ionomer cements: a systematic review

Research article

Evaluation of the morphometric covariation between palatal and craniofacial skeletal morphology in class III malocclusion growing subjects