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Clinical Oral Investigations
Published in: Clinical Oral Investigations 6/2021

01-06-2021 | Computed Tomography | Original Article

Influence of additional apical enlargement on microcrack formation in root dentine: a micro-computed tomography investigation

Authors: Ahmed Jamleh, Mohannad Nassar, Abdulmohsen Alfadley, Sulthan Khan, Khalid Alfouzan, Carlos Adorno

Published in: Clinical Oral Investigations | Issue 6/2021

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Abstract

Objectives

To assess the effect of additional apical enlargement using nickel titanium (NiTi) instruments on the incidence of microcracks using micro-computed tomographic analysis.

Materials and methods

Fifty-one premolars with single canals were enlarged to ProTaper Gold (PTG) F2 (25/08) (Dentsply Sirona), ProFile Vortex Blue (VB) 25/06 (Dentsply Tulsa), or WaveOne Gold (WOG) primary (25/07) (Dentsply Sirona) NiTi rotary instruments (n = 17 each). Afterward, additional apical enlargement was performed in each group with its corresponding larger instrument (F3 (30/09), VB 30/06, or WOG Medium (35/06) instruments, respectively). All teeth were imaged with micro-computed tomography before canal enlargement and after initial and additional apical enlargements to detect new microcracks at the apical 5 mm. An Aligned Rank Transform ANOVA was conducted to examine the effects of file type and canal enlargement on the number of new microcracks resulting from enlargement. A Kruskal-Wallis test was run to compare the file types at each canal enlargement stage.

Results

A significant main effect (P = 0.026) of canal enlargement on the number of new microcracks was found; the number of apical microcracks found after additional enlargement was significantly greater than baseline (P = 0.021); no significant difference was found between baseline and initial enlargement (P = 0.506) and between initial enlargement and additional enlargement (P = 0.252). The Kruskal-Wallis tests found no difference between file types at baseline (P = 0.348), after initial enlargement (P = 0.369) or additional enlargement (P = 0.133).

Conclusions

Regardless of the instrumentation system used, additional apical enlargement led to the formation of high number of new microcracks.

Clinical significance

The results indicated that additional enlargement induced significant number of apical microcracks.
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Metadata
Title
Influence of additional apical enlargement on microcrack formation in root dentine: a micro-computed tomography investigation
Authors
Ahmed Jamleh
Mohannad Nassar
Abdulmohsen Alfadley
Sulthan Khan
Khalid Alfouzan
Carlos Adorno
Publication date
01-06-2021
Publisher
Springer Berlin Heidelberg
Published in
Clinical Oral Investigations / Issue 6/2021
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI
https://doi.org/10.1007/s00784-020-03745-z

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