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Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models

OBJECTIVE: The aims of this study were to use a 3-dimensional (3D) system to compare molar relationship assessments performed from the buccal and lingual aspects, and to measure differences in occlusal contact areas between Class II and Class I molar relationships. METHODS: Study casts (232 pairs fr...

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Autores principales: Jang, Sook-Yoon, Kim, Minji, Chun, Youn-Sic
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Association of Orthodontists 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3481985/
https://www.ncbi.nlm.nih.gov/pubmed/23112949
http://dx.doi.org/10.4041/kjod.2012.42.4.182
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author Jang, Sook-Yoon
Kim, Minji
Chun, Youn-Sic
author_facet Jang, Sook-Yoon
Kim, Minji
Chun, Youn-Sic
author_sort Jang, Sook-Yoon
collection PubMed
description OBJECTIVE: The aims of this study were to use a 3-dimensional (3D) system to compare molar relationship assessments performed from the buccal and lingual aspects, and to measure differences in occlusal contact areas between Class II and Class I molar relationships. METHODS: Study casts (232 pairs from 232 subjects, yielding a total of 380 sides) were evaluated from both the buccal and lingual aspects, so that molar relationships could be classified according to the scheme devised by Liu and Melsen. Occlusal contact areas were quantified using 3D digital models, which were generated through surface scanning of the study casts. RESULTS: A cusp-to-central fossa relationship was observed from the lingual aspect in the majority of cases classified from the buccal aspect as Class I (89.6%) or mild Class II (86.7%). However, severe Class II cases had lingual cusp-to-mesial triangular fossa or marginal ridge relationships. Mean occlusal contact areas were similar in the Class I and mild Class II groups, while the severe Class II group had significantly lower values than either of the other 2 groups (p < 0.05). CONCLUSIONS: Buccal and lingual assessments of molar relationships were not always consistent. Occlusal contact areas were lowest for the Class II-severe group, which seems to have the worst molar relationships - especially as seen from the lingual aspect.
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spelling pubmed-34819852012-10-30 Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models Jang, Sook-Yoon Kim, Minji Chun, Youn-Sic Korean J Orthod Original Article OBJECTIVE: The aims of this study were to use a 3-dimensional (3D) system to compare molar relationship assessments performed from the buccal and lingual aspects, and to measure differences in occlusal contact areas between Class II and Class I molar relationships. METHODS: Study casts (232 pairs from 232 subjects, yielding a total of 380 sides) were evaluated from both the buccal and lingual aspects, so that molar relationships could be classified according to the scheme devised by Liu and Melsen. Occlusal contact areas were quantified using 3D digital models, which were generated through surface scanning of the study casts. RESULTS: A cusp-to-central fossa relationship was observed from the lingual aspect in the majority of cases classified from the buccal aspect as Class I (89.6%) or mild Class II (86.7%). However, severe Class II cases had lingual cusp-to-mesial triangular fossa or marginal ridge relationships. Mean occlusal contact areas were similar in the Class I and mild Class II groups, while the severe Class II group had significantly lower values than either of the other 2 groups (p < 0.05). CONCLUSIONS: Buccal and lingual assessments of molar relationships were not always consistent. Occlusal contact areas were lowest for the Class II-severe group, which seems to have the worst molar relationships - especially as seen from the lingual aspect. Korean Association of Orthodontists 2012-08 2012-08-28 /pmc/articles/PMC3481985/ /pubmed/23112949 http://dx.doi.org/10.4041/kjod.2012.42.4.182 Text en © 2012 The Korean Association of Orthodontists. 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 (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Jang, Sook-Yoon
Kim, Minji
Chun, Youn-Sic
Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models
title Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models
title_full Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models
title_fullStr Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models
title_full_unstemmed Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models
title_short Differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models
title_sort differences in molar relationships and occlusal contact areas evaluated from the buccal and lingual aspects using 3-dimensional digital models
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3481985/
https://www.ncbi.nlm.nih.gov/pubmed/23112949
http://dx.doi.org/10.4041/kjod.2012.42.4.182
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