3D Morphometric Analysis of Human Primary Second Molar Crowns and Its Implications on Interceptive Orthodontics

Alessandro Nota, Vincenzo Quinzi, Federico Floriani, Clizia Cappelli, Simona Tecco and Giuseppe Marzo
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Alessandro Nota: Dental School, Vita-Salute San Raffaele University and IRCCS San Raffaele, 20132 Milan, Italy
Vincenzo Quinzi: Department of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy
Federico Floriani: Private Practice, 20122 Milan, Italy
Clizia Cappelli: Private Practice, 20122 Milan, Italy
Simona Tecco: Dental School, Vita-Salute San Raffaele University and IRCCS San Raffaele, 20132 Milan, Italy
Giuseppe Marzo: Department of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy

IJERPH, 2021, vol. 18, issue 12, 1-11

Abstract: The second primary molar represents an anchorage element in interceptive orthodontics. The present study aims to analyze the 3D morphology of primary second molars in order to provide reference data and implications about the development of orthodontic bands for second primary molars. Digital models of dental arches from 150 subjects in primary or mixed dentition were analyzed. Six dimensional variables were digitally measured for each second primary molar, and the mean and standard error of the mean (SEM) were calculated and compared applying Student t -test statistical analysis. The mean value results show statistically significant dimensional differences between the upper and lower teeth, (mostly p < 0.0001), except for the variable h1, while only the variable h1 showed significant differences between the antimetric teeth (left and right). The dimensional variations between the right and left molars were considerably minor compared to those found by comparing the upper and lower arches. A significantly higher dimension of the lower molars and a more rectangular shape were observed.

Keywords: interceptive orthodontics; human teeth; orthodontic removable appliances; orthodontic appliances; orthodontic bands; digital orthodontics (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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