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Open AccessArticle

Mesial Rotation of the Upper First Molar: Association with Anterior Dental Crowding in Mixed and Permanent Dentition

1
Deparment of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy
2
Dental School, Vita-Salute San Raffaele University and IRCCS San Raffaele Hospital, 20132 Milano, Italy
*
Author to whom correspondence should be addressed.
The author were Principal Investigators with equal contribution.
Appl. Sci. 2020, 10(15), 5301; https://doi.org/10.3390/app10155301
Received: 5 July 2020 / Revised: 23 July 2020 / Accepted: 29 July 2020 / Published: 31 July 2020
(This article belongs to the Special Issue New Frontiers in Orofacial Diagnosis and Clinical Approach)
The position of the upper first molar (UFM) is currently considered the “key of occlusion”. The purpose of this study was to evaluate the prevalence of the mesiorotated UFM, and its relationship with anterior dental crowding in mixed and permanent dentition. Intra-oral scans of upper dental arches of 180 subjects with mixed dentition and 169 subjects with permanent dentition were retrospectively analyzed to investigate the presence of UFM mesiopalatal rotation and presence of anterior crowding. The occlusal relationship and the presence of caries were also recorded. In subjects with permanent dentition, there was a statistically significant correlation between anterior crowding and UFM mesiopalatal rotation (Pearson’s chi-square = 9.03; p = 0.06). Among cases with permanent dentition, subjects with UFM mesiopalatal rotation showed an OR = 3.28 (95% CI = 0.99–10.93; p = 0.042) of moderate/severe anterior dental crowding, respect to subjects without UFM rotation. In subjects with mixed dentition, there was a statistically significant correlation between molar occlusal relationship and UFM mesiopalatal rotation (Pearson’s chi-square = 14.98; p = 0.002), and subjects with molar class II showed a OR = 10.2 (95% CI = 2.16–48.22; p = 0.0005) to present UFM mesiopalatal rotation, with respect to subjects with molar class I. UFM mesiopalatal rotation is associated to anterior dental crowding in permanent dentition, and to class II malocclusion in mixed dentition. View Full-Text
Keywords: dentistry; molar; dental occlusion; dental crowding; molar class; dental models; dental arch; interceptive orthodontics; orthodontics dentistry; molar; dental occlusion; dental crowding; molar class; dental models; dental arch; interceptive orthodontics; orthodontics
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MDPI and ACS Style

Quinzi, V.; Tecco, S.; Nota, A.; Caggiati, E.; Mummolo, S.; Marzo, G. Mesial Rotation of the Upper First Molar: Association with Anterior Dental Crowding in Mixed and Permanent Dentition. Appl. Sci. 2020, 10, 5301. https://doi.org/10.3390/app10155301

AMA Style

Quinzi V, Tecco S, Nota A, Caggiati E, Mummolo S, Marzo G. Mesial Rotation of the Upper First Molar: Association with Anterior Dental Crowding in Mixed and Permanent Dentition. Applied Sciences. 2020; 10(15):5301. https://doi.org/10.3390/app10155301

Chicago/Turabian Style

Quinzi, Vincenzo; Tecco, Simona; Nota, Alessandro; Caggiati, Eleonora; Mummolo, Stefano; Marzo, Giuseppe. 2020. "Mesial Rotation of the Upper First Molar: Association with Anterior Dental Crowding in Mixed and Permanent Dentition" Appl. Sci. 10, no. 15: 5301. https://doi.org/10.3390/app10155301

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