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Related Concept Videos

Mass Analyzers: Overview01:13

Mass Analyzers: Overview

The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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An analytical methodology can be divided into four sequential steps: technique, method, procedure, and protocol. A technique is a scientific principle that rationalizes a specific phenomenon through chemical measurements. Adapting a technique for analyzing a sample of interest is termed a method. The procedure outlines the directions for performing the analysis via an analytical method. The protocol is the detailed guidelines on the procedure, which should be strictly followed to obtain the...
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Quality assurance is the overarching term used to describe the activities employed to ensure the proper performance of a system. These activities can be classified into three categories: quality control, quality assessment, and internal corrective measures. Typically, these activities work cyclically: quality control is performed before and during the analysis, while quality assessment occurs during and after the investigation. Internal corrective measures are implemented based on the findings...
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Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Maxillary arch development with clear aligners: A comprehensive scoping review.

Ibraheem K Bamaga1

  • 1Department of Basic and Clinical Oral Sciences, Umm Al-Qura University, Makkah, Saudi Arabia.

Journal of Orthodontic Science
|January 12, 2026
PubMed
Summary

Clear aligner therapy (CAT) shows moderate effectiveness for maxillary arch expansion via dental tipping in mild to moderate cases. However, CAT is less predictable for bodily movement or significant skeletal changes, requiring further research.

Keywords:
Clear aligner therapyInvisaligncrossbite correctionmaxillary arch expansiontransverse discrepancies

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Area of Science:

  • Orthodontics
  • Dental Biomaterials
  • Craniofacial Development

Background:

  • Increasing demand for esthetic, removable orthodontic alternatives.
  • Clear aligner therapy (CAT) is increasingly used for managing maxillary arch expansion and crossbites.
  • Evaluation of CAT's efficacy in transverse maxillary development is crucial.

Purpose of the Study:

  • To evaluate the efficacy and limitations of clear aligner therapy (CAT), specifically Invisalign, in the transverse development of the maxillary arch.
  • Assess the predictability and outcomes of CAT for maxillary expansion.
  • Identify areas for improvement in CAT protocols for transverse dimension management.

Main Methods:

  • A comprehensive literature search was conducted across multiple databases (PubMed, Scopus, Web of Science, etc.) for English-language studies.
  • Keywords included "maxillary arch development," "CAT," and "Invisalign" for studies published between 2020 and 2024.
  • Eight studies were included following PRISMA guidelines from 3,190 initial records.

Main Results:

  • Clear aligners achieve maxillary expansion primarily through buccal tipping of posterior teeth.
  • Bodily movement and predictability of expansion outcomes, especially at the root or gingival level, remain limited.
  • Expansion efficiency varied, with some studies reporting high success at the cusp width but discrepancies between planned and achieved results.

Conclusions:

  • Clear aligners offer moderate effectiveness for maxillary arch expansion, mainly through dental tipping in mild to moderate cases.
  • CAT is less predictable for achieving bodily movement or substantial skeletal changes.
  • High-quality, controlled trials are necessary to validate findings and optimize treatment protocols for transverse maxillary development.