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Related Concept Videos

Tooth Anatomy01:21

Tooth Anatomy

1.7K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
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Related Experiment Video

Updated: Nov 17, 2025

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
07:32

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

Published on: February 23, 2024

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Maxillary arch development with Invisalign system.

Roberta Lione, Valeria Paoloni, Lorenzo Bartolommei

    The Angle Orthodontist
    |February 11, 2021
    PubMed
    Summary

    Clear aligner treatment effectively expanded the maxillary arch, particularly at the premolars. However, precise canine movement prediction remains a challenge, requiring careful planning for optimal outcomes.

    Keywords:
    Clear aligner techniqueDental movementDigital cast analysisMaxillary expansion

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    Area of Science:

    • Orthodontics
    • Dental Biomaterials

    Background:

    • Maxillary arch expansion is a common orthodontic procedure.
    • Clear aligners offer a less invasive alternative to traditional braces.
    • Predicting tooth movement with clear aligners is crucial for treatment success.

    Purpose of the Study:

    • To evaluate tooth movements during maxillary arch expansion using clear aligner treatment.
    • To assess the predictability of tooth movements with clear aligners.

    Main Methods:

    • Prospective study of 28 subjects undergoing Invisalign treatment for posterior transverse discrepancy.
    • Measurements of linear and angular changes before, during, and after treatment.
    • Statistical analysis using paired t-tests to compare changes.

    Main Results:

    • Significant maxillary width increase observed, greatest at the first and second premolars (+3.5 mm and +3.8 mm, respectively).
    • Statistically significant changes in tooth inclination occurred for all teeth except second molars.
    • Maxillary canine movements showed significant differences between actual and predicted outcomes, indicating poor predictability.

    Conclusions:

    • Clear aligner treatment effectively expands the maxillary arch, with notable increases in width at the premolars.
    • Predictability of maxillary canine movements with clear aligners is limited.
    • Overcorrection for maxillary canines should be considered in treatment planning for dentoalveolar expansion.