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Teeth

Teeth

The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...

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Related Experiment Video

Updated: Aug 26, 2025

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

Is it necessary to remove bone-impacted teeth? A retrospective study.

Rui Zou¹, Yu Qiao¹, Ying Lin²

¹Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, Guangdong 510182.

Journal of Stomatology, Oral and Maxillofacial Surgery

|October 8, 2022

Summary

This summary is machine-generated.

Extracting impacted third molars (M3) carries risks. This study found M3 removal is advisable if adjacent second molars (M2) show no root resorption, especially when M3 crowns contact M2 apices.

Keywords:

Bone impacted teeth Cone beam computer tomography External root resorption Third molar

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Area of Science:

Dentistry
Oral Surgery
Radiology

Background:

Surgical extraction of impacted teeth poses risks like fractures and sinus perforations.
Deciding on extraction of bone-impacted teeth is challenging for clinicians.
Complications associated with impacted third molar extraction necessitate careful evaluation.

Purpose of the Study:

To analyze the possibility and implications of extracting fully impacted third molars (M3).
To investigate the relationship between third molar impaction and second molar root resorption.
To provide evidence-based guidance for M3 extraction decisions.

Main Methods:

Analysis of 360 fully impacted third molars from 261 patients using CBCT imaging.
Assessment of second molar (M2) root resorption in relation to patient age, impaction type, and contact points.
Logistic regression analysis to calculate odds ratios (OR) and 95% confidence intervals.

Main Results:

Bone-impacted M3 were found in 11.92% of patients diagnosed with impacted teeth.
Significant association between M2 root resorption and M3 contact points (P<0.001).
Vertical impaction type showed a significant difference compared to Level 3 (P<0.05).

Conclusions:

Third molar (M3) extraction is recommended if adjacent second molars (M2) exhibit no root resorption.
Root resorption risk increases when the M3 crown contacts the M2 apex.
Thorough preoperative assessment and surgical experience minimize extraction risks.