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24.11.2020 | Original Article

Root groove depth and inter-orifice canal distance as anatomical predictive factors for danger zone in the mesial root of mandibular first molars

verfasst von: Gustavo De-Deus, Evaldo Almeida Rodrigues, Jong-Ki Lee, J. Kim, Emmanuel João Nogueira Leal da Silva, Felipe Gonçalves Belladonna, Daniele Moreira Cavalcante, Marco Simões-Carvalho, Diogo da Silva Oliveira, Marco Aurélio Versiani, Erick Miranda Souza

Erschienen in: Clinical Oral Investigations | Ausgabe 6/2021

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Abstract

Objectives

This study evaluated the danger zone (DZ) in mesial roots of mandibular molars and the correlation between anatomical references of the DZ and some anatomical landmarks including tooth/root length, depth of mesial and distal grooves, and inter-canal orifices distance.

Material and methods

Twenty-eight mesial roots of mandibular molars with 2 independent canals were scanned and divided into 2 groups according to root length. The anatomical landmarks were correlated (Pearson or Spearman coefficients) with root level, thickness, and position of the DZ and also compared (independent samples t or Mann-Whitney tests) between the 2 groups at α = 5%.

Results

No statistical difference was observed between groups regarding DZ parameters and depth of mesial and distal grooves (P > 0.05). Orifice distance in group 2 (4.49 ± 0.75 mm) was significantly greater than group 1 (3.76 ± 0.89 mm) (P < 0.05). Significant correlations (P < 0.05) were found between (i) DZ level and root/tooth length (r = 0.54 and 0.49, respectively), (ii) DZ thickness and distal groove depth (r = − 0.45), and orifice distance (r = 0.38), and (iii) DZ position and depth of mesial (r = 0.39) and distal (r = 0.40) grooves. Other variables such as root length and distal groove depth (r = 0.28), and orifice distance and mesial groove depth (r = 0.36) were also correlated (P < 0.05).

Conclusions

The length of tooth/root, the distance of canal orifices, and the depth of mesial/distal grooves of mesial roots of mandibular molars might be predictive factors for the root level, position, and thickness of the DZ.

Clinical relevance

The length, distance of mesial canal orifices, and the depth of mesial and distal grooves of the mesial roots of mandibular molars might be moderate predictive factors for the root level, position, and thickness of the DZ.

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Titel: Root groove depth and inter-orifice canal distance as anatomical predictive factors for danger zone in the mesial root of mandibular first molars
verfasst von: Gustavo De-Deus
Evaldo Almeida Rodrigues
Jong-Ki Lee
J. Kim
Emmanuel João Nogueira Leal da Silva
Felipe Gonçalves Belladonna
Daniele Moreira Cavalcante
Marco Simões-Carvalho
Diogo da Silva Oliveira
Marco Aurélio Versiani
Erick Miranda Souza
Publikationsdatum: 24.11.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: Clinical Oral Investigations / Ausgabe 6/2021
Print ISSN: 1432-6981
Elektronische ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-020-03686-7

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Root groove depth and inter-orifice canal distance as anatomical predictive factors for danger zone in the mesial root of mandibular first molars