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An in vitro assessment of type, position and incidence of isthmus in human permanent molars

Root canal anatomical complexities, such as isthmus, may limit the action of the endodontic instruments, irrigant solutions and intracanal medications, leading to endodontic treatment failure. OBJECTIVES: This in vitro study assessed the type, position and incidence of isthmus in human permanent mol...

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Autores principales: de LIMA, Fernando José Camello, MONTAGNER, Francisco, JACINTO, Rogério Castilho, AMBROSANO, Glaucia Maria Bovi, GOMES, Brenda Paula Figueiredo de Almeida
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Faculdade de Odontologia de Bauru da Universidade de São Paulo 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4126822/
https://www.ncbi.nlm.nih.gov/pubmed/25141198
http://dx.doi.org/10.1590/1678-775720130585
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author de LIMA, Fernando José Camello
MONTAGNER, Francisco
JACINTO, Rogério Castilho
AMBROSANO, Glaucia Maria Bovi
GOMES, Brenda Paula Figueiredo de Almeida
author_facet de LIMA, Fernando José Camello
MONTAGNER, Francisco
JACINTO, Rogério Castilho
AMBROSANO, Glaucia Maria Bovi
GOMES, Brenda Paula Figueiredo de Almeida
author_sort de LIMA, Fernando José Camello
collection PubMed
description Root canal anatomical complexities, such as isthmus, may limit the action of the endodontic instruments, irrigant solutions and intracanal medications, leading to endodontic treatment failure. OBJECTIVES: This in vitro study assessed the type, position and incidence of isthmus in human permanent molars. MATERIAL AND METHODS: One hundred and twenty eight upper and lower first and second permanent molars were analyzed. The roots were embedded in transparent resin, and then split at different distances from the apex (1.0-2.5-4.0-5.5-7.0 mm). Following the sample examination in stereomicroscope, the data were submitted to chi-square statistical test at a 5% significance level. RESULTS: The highest isthmus incidence was at 7.0 mm from the root apex in all samples, except the distal root of lower molars (at 5.5 mm). In upper and lower molars, type V (complete isthmus with a continuous opening between the two main root canals) was the most common classification of isthmus (28.8%). In the mesial root of first and second mandibular molars, type IV had the highest incidence (36% and 23.9%, respectively). CONCLUSION: It was concluded that isthmus was widely found in flat roots, with a low percentage in areas close to the apex. In upper and lower molars, these structures were most frequently found at 7 mm from the apex.
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spelling pubmed-41268222014-08-11 An in vitro assessment of type, position and incidence of isthmus in human permanent molars de LIMA, Fernando José Camello MONTAGNER, Francisco JACINTO, Rogério Castilho AMBROSANO, Glaucia Maria Bovi GOMES, Brenda Paula Figueiredo de Almeida J Appl Oral Sci Original Articles Root canal anatomical complexities, such as isthmus, may limit the action of the endodontic instruments, irrigant solutions and intracanal medications, leading to endodontic treatment failure. OBJECTIVES: This in vitro study assessed the type, position and incidence of isthmus in human permanent molars. MATERIAL AND METHODS: One hundred and twenty eight upper and lower first and second permanent molars were analyzed. The roots were embedded in transparent resin, and then split at different distances from the apex (1.0-2.5-4.0-5.5-7.0 mm). Following the sample examination in stereomicroscope, the data were submitted to chi-square statistical test at a 5% significance level. RESULTS: The highest isthmus incidence was at 7.0 mm from the root apex in all samples, except the distal root of lower molars (at 5.5 mm). In upper and lower molars, type V (complete isthmus with a continuous opening between the two main root canals) was the most common classification of isthmus (28.8%). In the mesial root of first and second mandibular molars, type IV had the highest incidence (36% and 23.9%, respectively). CONCLUSION: It was concluded that isthmus was widely found in flat roots, with a low percentage in areas close to the apex. In upper and lower molars, these structures were most frequently found at 7 mm from the apex. Faculdade de Odontologia de Bauru da Universidade de São Paulo 2014 /pmc/articles/PMC4126822/ /pubmed/25141198 http://dx.doi.org/10.1590/1678-775720130585 Text en http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
de LIMA, Fernando José Camello
MONTAGNER, Francisco
JACINTO, Rogério Castilho
AMBROSANO, Glaucia Maria Bovi
GOMES, Brenda Paula Figueiredo de Almeida
An in vitro assessment of type, position and incidence of isthmus in human permanent molars
title An in vitro assessment of type, position and incidence of isthmus in human permanent molars
title_full An in vitro assessment of type, position and incidence of isthmus in human permanent molars
title_fullStr An in vitro assessment of type, position and incidence of isthmus in human permanent molars
title_full_unstemmed An in vitro assessment of type, position and incidence of isthmus in human permanent molars
title_short An in vitro assessment of type, position and incidence of isthmus in human permanent molars
title_sort in vitro assessment of type, position and incidence of isthmus in human permanent molars
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4126822/
https://www.ncbi.nlm.nih.gov/pubmed/25141198
http://dx.doi.org/10.1590/1678-775720130585
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