Age estimation using the Demirjian method in third molars on cone beam computed tomography images
Bibliographic record
Abstract
The study aimed to estimate the chronologic age of individuals and whether they were aged under or over 18 years by using the Demirjian method on cone beam computed tomography (CBCT) images. The developmental stages of the third molars in the maxilla and mandible of 445 individuals aged between 9 and 26 years were evaluated as eight stages from A to H according to the Demirjian method. The association of these eight stages with chronologic age according to the age of 18 years, which is accepted as the threshold value, and the distribution of the stages was statistically analyzed. There was no significant difference in the mean age at which developmental stages (A–H) were seen between the sexes (p > .05). Stage A was observed up to the age of 15 years in females and 14 years in males, and stage H was observed at the age of 16 at the earliest in both sexes. Stages A and B were not seen in individuals aged 18 years and over. The age of individuals and whether they are below or above 18 years can be estimated by evaluating the development of third molars according to the Demirjian method.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".