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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

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Three-dimensional morphometric study on the retromolar pad.

Min-Sang Cha¹, Dae-Gon Kim², Yoon-Hyuk Huh²

¹Department of Dentistry, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea.

The Journal of Advanced Prosthodontics

|January 11, 2024

Summary

This study classified retromolar pad shapes into pear, oval/round, and triangular, finding pear to be most common. Morphometric differences were observed between sexes and shapes, particularly in transverse measurements.

Keywords:

3D image Classification Morphometry Retromolar pad

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Area of Science:

Dentistry
Oral anatomy
3D imaging

Background:

Retromolar pads are crucial anatomical landmarks in the mandible.
Accurate classification and morphometric analysis of retromolar pads are essential for dental prosthetics and surgical planning.

Purpose of the Study:

To classify retromolar pad shapes using a 3D model.
To assess morphometric differences among these shapes.

Main Methods:

A 3D laser scanner was used to obtain scan data from mandibular casts of 200 patients.
Seven morphometric parameters were measured using image analysis software.
Retromolar pads were classified into three shapes: pear, oval/round, and triangular.

Main Results:

High intra-examiner reliability (Cronbach's alpha = 0.933) was achieved for shape classification.
The pear shape was most prevalent (56.5%), followed by oval/round (27.7%) and triangular (15.8%).
Significant morphometric differences were found between sexes (transverse diameter, diameter ratio) and among shapes (triangular vs. pear/oval-round).

Conclusions:

Classifying retromolar pads into three shapes is clinically reliable.
Observed size differences among shapes are primarily due to variations in transverse measurements.