The variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomography
ABSTRACT Objective: To determine the discrepancy of crown-root morphology of anterior teeth, using cone-beam computed tomography (CBCT), and to provide a guidance for proper torque expression. Methods: A total of eligible 200 CBCT were imported into Invivo v. 5.4 software, to obtain the middle lab...
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| Format: | Article |
| Language: | English |
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Dental Press Editora
2022-05-01
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| Series: | Dental Press Journal of Orthodontics |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2176-94512022000100307&tlng=en |
| _version_ | 1818201804061540352 |
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| author | Xiao-ming WANG Ling-zhi MA Mei-fang YAN Jun ZHENG Mi WANG Xue HUI |
| author_facet | Xiao-ming WANG Ling-zhi MA Mei-fang YAN Jun ZHENG Mi WANG Xue HUI |
| author_sort | Xiao-ming WANG |
| collection | DOAJ |
| description | ABSTRACT Objective: To determine the discrepancy of crown-root morphology of anterior teeth, using cone-beam computed tomography (CBCT), and to provide a guidance for proper torque expression. Methods: A total of eligible 200 CBCT were imported into Invivo v. 5.4 software, to obtain the middle labio-lingual sections of anterior teeth. AutoCAD 2007 software was applied to measure the crown-root angulation (Collum angle) and the angle formed by a tangent to the center of the labial surface and the long axis of the crown (labial surface angle). SPSS 18.0 was used for statistical comparisons of the two measurements, at the level of p< 0.05, and the Pearson correlation analysis was applied to investigate the association between the two measurements. Results: The value of Collum angle in maxillary central incisor was close to 0°. Significantly negative Collum angle in lateral incisors and maxillary canine, and positive value in mandibular canine were detected (p < 0.001). The labial surface angle in canine was significantly greater than the intra-arch incisors (p< 0.001), and no significant difference was detected between the central and lateral incisors (p > 0.05). Notably, there was also a significant positive correlation between the two measurements. Conclusions: The crown-root angulations were greatly different among anterior teeth. Accompanying the obvious crown-root angulations, the canines both in maxillary and mandibular arches presented considerable labial surface curvatures. Hence, equivalent deviation during bracket bonding might cause greater torque expression error and increase the risk of alveolar fenestration and dehiscence. |
| first_indexed | 2024-12-12T02:59:22Z |
| format | Article |
| id | doaj.art-ccaa95c469024267aa2dc94e46f246b5 |
| institution | Directory Open Access Journal |
| issn | 2177-6709 |
| language | English |
| last_indexed | 2024-12-12T02:59:22Z |
| publishDate | 2022-05-01 |
| publisher | Dental Press Editora |
| record_format | Article |
| series | Dental Press Journal of Orthodontics |
| spelling | doaj.art-ccaa95c469024267aa2dc94e46f246b52022-12-22T00:40:40ZengDental Press EditoraDental Press Journal of Orthodontics2177-67092022-05-0127110.1590/2177-6709.27.1.e222079.oarThe variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomographyXiao-ming WANGhttps://orcid.org/0000-0001-8106-5970Ling-zhi MAhttps://orcid.org/0000-0002-0069-6023Mei-fang YANhttps://orcid.org/0000-0001-9615-3623Jun ZHENGhttps://orcid.org/0000-0003-2904-478XMi WANGhttps://orcid.org/0000-0002-0595-8846Xue HUIhttps://orcid.org/0000-0003-4182-8050ABSTRACT Objective: To determine the discrepancy of crown-root morphology of anterior teeth, using cone-beam computed tomography (CBCT), and to provide a guidance for proper torque expression. Methods: A total of eligible 200 CBCT were imported into Invivo v. 5.4 software, to obtain the middle labio-lingual sections of anterior teeth. AutoCAD 2007 software was applied to measure the crown-root angulation (Collum angle) and the angle formed by a tangent to the center of the labial surface and the long axis of the crown (labial surface angle). SPSS 18.0 was used for statistical comparisons of the two measurements, at the level of p< 0.05, and the Pearson correlation analysis was applied to investigate the association between the two measurements. Results: The value of Collum angle in maxillary central incisor was close to 0°. Significantly negative Collum angle in lateral incisors and maxillary canine, and positive value in mandibular canine were detected (p < 0.001). The labial surface angle in canine was significantly greater than the intra-arch incisors (p< 0.001), and no significant difference was detected between the central and lateral incisors (p > 0.05). Notably, there was also a significant positive correlation between the two measurements. Conclusions: The crown-root angulations were greatly different among anterior teeth. Accompanying the obvious crown-root angulations, the canines both in maxillary and mandibular arches presented considerable labial surface curvatures. Hence, equivalent deviation during bracket bonding might cause greater torque expression error and increase the risk of alveolar fenestration and dehiscence.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2176-94512022000100307&tlng=enAnterior teethCrown-root morphologyCollum angleLabial surface angleCone-beam CT |
| spellingShingle | Xiao-ming WANG Ling-zhi MA Mei-fang YAN Jun ZHENG Mi WANG Xue HUI The variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomography Dental Press Journal of Orthodontics Anterior teeth Crown-root morphology Collum angle Labial surface angle Cone-beam CT |
| title | The variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomography |
| title_full | The variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomography |
| title_fullStr | The variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomography |
| title_full_unstemmed | The variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomography |
| title_short | The variation in crown-root morphology of anterior teeth assessed with cone-beam computed tomography |
| title_sort | variation in crown root morphology of anterior teeth assessed with cone beam computed tomography |
| topic | Anterior teeth Crown-root morphology Collum angle Labial surface angle Cone-beam CT |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2176-94512022000100307&tlng=en |
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