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. 2022 Jun 23;9(7):941.
doi: 10.3390/children9070941.

Relationship between Physiological Resorption of Primary Molars with Its Permanent Successors, Dental Age and Chronological Age

Antonia M Caleya  1 , Nuria E Gallardo  1 , Gonzalo Feijoo  1 , M Rosa Mourelle-Martínez  1 , Andrea Martín-Vacas  1   2 , Myriam Maroto  1
Affiliations

Relationship between Physiological Resorption of Primary Molars with Its Permanent Successors, Dental Age and Chronological Age

Antonia M Caleya et al. Children (Basel). .

Abstract

The aim of the present study was to analyse root resorption of the primary mandibular molars and their relationship with their permanent successors and the age of the patient.

Methods: The sample consisted of 408 digital panoramic radiographs. The mesial and distal crown-to-root ratios (CRR) of #74 and #75 were calculated by dividing the measures of the length of each root by its coronal height. The Demirjian formation stage of the premolar was established, and dental age was determined. A descriptive and statistical analysis was performed using SPSS to determine the correlation between the variables (Pearson's correlation coefficient) and to identify the differences between them (Student's t-test), with a confidence level of 95%.

Results: 723 molars were measured, and tables of CRR depending on dental and chronological age were obtained. The CRR decreased with increasing dental and chronological age, but not uniformly. The CRR of #74 and #75 decreased slightly when the successor premolar was in the initial stages of formation. Gender differences were obtained with respect to chronological age, mainly in girls, because the root resorption of #74 was always more advanced, and the formation of the #34 more advanced.

Conclusions: Root resorption of the molar is slight and progressive when the successor premolar begins formation until stage D, and becomes higher starting at stage E. It is possible to determine the state of the child's maturation and the CRR according to dental and chronological age.

Keywords: crown-to-root ratio; dental age; dental root resorption; paediatric dentistry; root resorption.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Magnification detail of an orthopantomograph, in which the reference of the dentin–enamel junction is observed in mesial (green arrows) and distal (blue arrows).
Figure 2
Figure 2
The CRR of #74 and #75, classified according to chronological age (a) and dental age (b).
Figure 3
Figure 3
The CRR of #74 and #75, according to the stage of development of #34 (a) and #35 (b).
See this image and copyright information in PMC

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