What is it about?

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.

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Why is it important?

The study on the relationship between physiological resorption of primary molars and their permanent successors, along with dental and chronological age, is important for several reasons. First, understanding how primary molars resorb naturally is essential for predicting when and how permanent teeth will erupt. This knowledge can help dental professionals monitor children's development more effectively and intervene when necessary.Second, the findings can assist in identifying potential dental issues related to abnormal resorption patterns or delayed eruption of permanent teeth. By correlating dental age and chronological age with resorption processes, clinicians can provide more personalized care tailored to each child's developmental timeline.Additionally, this research contributes to a broader understanding of normal dental development in children, establishing benchmarks for healthy growth. Ultimately, the insights gained from this study can improve clinical practices, enhance patient outcomes, and inform parents about their children's dental development.

Perspectives

I believe this research is essential for understanding the dental transition process in children. Physiological resorption of primary molars is a key factor that facilitates the eruption of permanent teeth, and understanding its relationship with dental and chronological age allows us to anticipate potential developmental issues. This study also provides valuable insights for clinicians, helping them identify resorption patterns that may vary according to a child's age and development. This enables a more personalized approach to treatment and monitoring of pediatric dental health. Additionally, the findings can educate parents and healthcare professionals about the importance of dental health during these critical stages, promoting regular check-ups. In summary, this work not only contributes to scientific knowledge but also has practical implications for pediatric dental care.

Prof. Rosa Mourelle
Universidad Complutense de Madrid

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This page is a summary of: Relationship between Physiological Resorption of Primary Molars with Its Permanent Successors, Dental Age and Chronological Age, Children, June 2022, MDPI AG,
DOI: 10.3390/children9070941.
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