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Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study

BACKGROUND: Relatively high incidence of single canals with oval or round shape were observed in human mandibular incisors. In order to investigate the influence of the root canal morphology on root canal preparation, the shaping outcome of ProTaper NEXT in oval and round canals of mandibular inciso...

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Autores principales: Wang, Hao, Yang, Xueqin, Zou, Ling, Huang, Dingming, Zhou, Xuedong, Xu, Jialei, Gao, Yuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9308234/
https://www.ncbi.nlm.nih.gov/pubmed/35869473
http://dx.doi.org/10.1186/s12903-022-02335-7
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author Wang, Hao
Yang, Xueqin
Zou, Ling
Huang, Dingming
Zhou, Xuedong
Xu, Jialei
Gao, Yuan
author_facet Wang, Hao
Yang, Xueqin
Zou, Ling
Huang, Dingming
Zhou, Xuedong
Xu, Jialei
Gao, Yuan
author_sort Wang, Hao
collection PubMed
description BACKGROUND: Relatively high incidence of single canals with oval or round shape were observed in human mandibular incisors. In order to investigate the influence of the root canal morphology on root canal preparation, the shaping outcome of ProTaper NEXT in oval and round canals of mandibular incisors were evaluated by using micro-computed tomography (micro-CT) analysis. METHODS: This experiment was approved by the School Medical Ethics Committee. The sample size calculation was conducted using G*Power software. Intact mandibular incisors with a single canal were selected. Oval canals (2 < aspect ratio (AR) ≤ 4) and round canals (AR ≤ 2) were pair-matched according to canal length, and assigned to two experimental groups (13 per group). ProTaper NEXT was used for root canal preparation for both groups. Untouched canal wall (UCW), root canal morphological parameters and three-dimensional (3D) dentin thickness were evaluated in the entire root canal and each canal third after micro-CT scanning. Statistical analysis: Data were collected and analyzed with Mann–Whitney test and Friedman test using SPSS statistics software 25 (P < 0.05). Additionally, correlations of UCW area with canal morphological parameters were also investigated. RESULTS: After root canal preparation, no significant difference was observed in all analyzed parameters in the apical third between oval and round canal groups (P > 0.05). In the coronal two thirds of the canal, the post-operative structure model index (SMI), form factor and roundness were significantly increased, while the AR was significantly decreased in both groups (P < 0.05). In addition, in the coronal two thirds, significantly more UCW and higher UCWΔ% was observed in oval canal group (P < 0.05). Furthermore, UCW correlated very strongly to canal major diameter (0.924) and initial volume (0.938), and strongly to canal form factor (− 0.724), minor diameter (0.799) and canal area (0.882). Proximal dentin wall was associated with significantly thinner pre-operative dentin thickness and higher amount of dentin removal after root canal preparation in both oval and round canal groups. CONCLUSIONS: (1) Both types of canals were more conical after root canal preparation, but oval root canals tend to leave more UCW area than round canals in the coronal two thirds of mandibular incisors, which contributes to the challenge for endodontic infection control. (2) Root canal preparation usually results in excessive dentin removal in the proximal dentin wall comparing with buccal and lingual walls in both types of canals of mandibular incisors. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12903-022-02335-7.
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spelling pubmed-93082342022-07-24 Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study Wang, Hao Yang, Xueqin Zou, Ling Huang, Dingming Zhou, Xuedong Xu, Jialei Gao, Yuan BMC Oral Health Research BACKGROUND: Relatively high incidence of single canals with oval or round shape were observed in human mandibular incisors. In order to investigate the influence of the root canal morphology on root canal preparation, the shaping outcome of ProTaper NEXT in oval and round canals of mandibular incisors were evaluated by using micro-computed tomography (micro-CT) analysis. METHODS: This experiment was approved by the School Medical Ethics Committee. The sample size calculation was conducted using G*Power software. Intact mandibular incisors with a single canal were selected. Oval canals (2 < aspect ratio (AR) ≤ 4) and round canals (AR ≤ 2) were pair-matched according to canal length, and assigned to two experimental groups (13 per group). ProTaper NEXT was used for root canal preparation for both groups. Untouched canal wall (UCW), root canal morphological parameters and three-dimensional (3D) dentin thickness were evaluated in the entire root canal and each canal third after micro-CT scanning. Statistical analysis: Data were collected and analyzed with Mann–Whitney test and Friedman test using SPSS statistics software 25 (P < 0.05). Additionally, correlations of UCW area with canal morphological parameters were also investigated. RESULTS: After root canal preparation, no significant difference was observed in all analyzed parameters in the apical third between oval and round canal groups (P > 0.05). In the coronal two thirds of the canal, the post-operative structure model index (SMI), form factor and roundness were significantly increased, while the AR was significantly decreased in both groups (P < 0.05). In addition, in the coronal two thirds, significantly more UCW and higher UCWΔ% was observed in oval canal group (P < 0.05). Furthermore, UCW correlated very strongly to canal major diameter (0.924) and initial volume (0.938), and strongly to canal form factor (− 0.724), minor diameter (0.799) and canal area (0.882). Proximal dentin wall was associated with significantly thinner pre-operative dentin thickness and higher amount of dentin removal after root canal preparation in both oval and round canal groups. CONCLUSIONS: (1) Both types of canals were more conical after root canal preparation, but oval root canals tend to leave more UCW area than round canals in the coronal two thirds of mandibular incisors, which contributes to the challenge for endodontic infection control. (2) Root canal preparation usually results in excessive dentin removal in the proximal dentin wall comparing with buccal and lingual walls in both types of canals of mandibular incisors. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12903-022-02335-7. BioMed Central 2022-07-22 /pmc/articles/PMC9308234/ /pubmed/35869473 http://dx.doi.org/10.1186/s12903-022-02335-7 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
spellingShingle Research
Wang, Hao
Yang, Xueqin
Zou, Ling
Huang, Dingming
Zhou, Xuedong
Xu, Jialei
Gao, Yuan
Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study
title Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study
title_full Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study
title_fullStr Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study
title_full_unstemmed Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study
title_short Shaping outcome of ProTaper NEXT for root canal preparation in mandibular incisors: a micro-CT study
title_sort shaping outcome of protaper next for root canal preparation in mandibular incisors: a micro-ct study
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9308234/
https://www.ncbi.nlm.nih.gov/pubmed/35869473
http://dx.doi.org/10.1186/s12903-022-02335-7
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