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Eruption process of the second molar.

¹Department of Pedodontics, School of Dentistry, China Medical College, Taichung, Taiwan, Republic of China.

ASDC Journal of Dentistry for Children

|September 21, 2000

Summary

Understanding second molar development is crucial for orthodontic planning. Maxillary second molars erupt earlier than mandibular ones, with space availability influencing their eruption path.

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Area of Science:

Dentistry
Orthodontics
Dental Development

Background:

The developmental stage of second molars is critical for planning first molar distalization in orthodontics.
Limited research exists on the specific eruption patterns and developmental timelines of second molars.

Purpose of the Study:

To analyze the eruption process of maxillary and mandibular second molars.
To correlate developmental stages with space availability and tooth dimensions.

Main Methods:

Utilized 238 panoramic radiographs to assess second molar development.
Defined four distinct developmental stages based on calcification and root formation.
Measured mesiodistal crown width, axial inclination, eruption rate, and available space.

Main Results:

Mandibular second molars initiate eruption at stage 3; maxillary at stage 2.
Maxillary second molars gradually upright, while mandibular remain stable in inclination.
Available space for eruption increases significantly between stages 1 and 2 for both arches.

Conclusions:

Adequate space for second molar emergence is established before stage 2.
Maxillary second molars show increased space availability post-stage 3, potentially accommodating larger crown widths.
Correlations suggest mandibular second molar size impacts available space in stage 2, while maxillary size influences it in stage 3.

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