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Related Experiment Video

Updated: May 3, 2026

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Published on: August 22, 2022

Three cases of distomolars.

Hitoshi Ohata¹, Kamichika Hayashi, Masashi Iwamoto

¹Department of Oral and Maxillofacial Surgery, Tokyo Dental College.

The Bulletin of Tokyo Dental College

|February 14, 2014

Summary

Impacted supernumerary teeth, particularly mandibular distomolars (fourth molars), are rare in the molar region. This study compares the morphology of extracted third molars and rare distomolars.

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Area of Science:

Dentistry
Oral and Maxillofacial Surgery
Dental Anatomy

Background:

Supernumerary teeth occur frequently, most often in the anterior maxilla.
Impacted supernumerary teeth in the molar region are uncommon, with mandibular distomolars being exceptionally rare.

Observation:

This study presents two cases of impacted mandibular distomolars and one case of a maxillary distomolar.
In each case, both the third molar and the distomolar were surgically extracted for analysis.

Findings:

Macroscopic morphological analysis was performed on the extracted third molars and distomolars.
The morphological findings were compared with existing literature on supernumerary distomolars and third molars.

Implications:

This research contributes to understanding the rare occurrence and morphology of mandibular and maxillary distomolars.
The findings may aid clinicians in diagnosing and managing impacted supernumerary molar teeth.