[Anatomical and histological studies on a microdontic wisdom tooth]

Area of Science:

• Dentistry
• Oral Biology
• Histology

Background:

• Microdontia, a rare dental anomaly, presents unique challenges in understanding tooth development and structure.
• Wisdom teeth (third molars) are frequently affected by developmental variations, making them subjects of significant research interest.

Observation:

• A significantly reduced upper right microdontic wisdom tooth from a 36-year-old male was analyzed using various microscopy techniques (binocular, polarizing, phase, scanning electron) and microradiography.
• Measurements revealed the tooth was approximately half the length, one-third the breadth, and one-quarter the thickness of average Japanese upper third molars.
• The tooth possessed a single cusp and a single root, suggesting a fusion of mesiolingual and mesiobuccal cusps while retaining fundamental molar surface features.

Findings:

• Histological examination indicated denser dentinal tubules and thicker enamel rods compared to typical wisdom teeth, attributed to limited space for odontoblasts and ample space for ameloblasts, respectively.
• Degenerative changes were observed not only in the overall dental form but also in the enamel's histological structure, with the surface layer exhibiting a lamellar structure.

Implications:

• Understanding the unique morphology and histology of microdontic teeth is crucial for accurate diagnosis and treatment planning in restorative and surgical dentistry.
• This case study provides valuable insights into the developmental processes and potential pathologies associated with microdontia, contributing to the broader field of dental anomaly research.