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Does third molar agenesis influence the second lower molar mineralization?

C Ferreira¹, I M Caldas^2,3,4

¹Faculdade de Medicina Dentária da Universidade do Porto, Rua Dr. Manuel Pereira da Silva, 4200-393, Porto, Portugal.

International Journal of Legal Medicine

|November 23, 2023

Summary

Third molar agenesis, or the absence of wisdom teeth, may delay the mineralization of the second mandibular molar. This finding is crucial for improving the accuracy of forensic age estimation using dental techniques.

Keywords:

Agenesis Dental age estimation Forensic age estimation Second molar Third molar agenesis Tooth mineralization

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Area of Science:

Forensic Anthropology
Odontology
Developmental Biology

Background:

The second mandibular molar's mineralization is a key indicator in forensic age estimation.
Accurate age estimation is ethically imperative, minimizing misclassifications.
The influence of missing teeth, specifically third molar agenesis, on dental development remains unclear.

Purpose of the Study:

To investigate if third molar agenesis impacts the timing of second mandibular molar mineralization.
To assess the implications of this impact on forensic age estimation accuracy.

Main Methods:

Analysis of 355 orthopantomograms (dental X-rays).
Assessment of third molar agenesis and second mandibular molar mineralization using Demirjian stages.
Statistical comparison (Student's t-test) of mineralization timing between groups with and without third molar agenesis.

Main Results:

A statistically significant delay in second mandibular molar mineralization was observed in individuals with third molar agenesis.
The study identified differences in the mean age of reaching various mineralization stages.

Conclusions:

Third molar agenesis appears to influence the mineralization timeline of the second mandibular molar.
Forensic age estimation methods utilizing dental development should account for the presence or absence of third molars to enhance accuracy.