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Related Concept Videos

Molar Mass01:54

Molar Mass

87.2K
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties.
87.2K
Applications of the Ideal Gas Law: Molar Mass, Density, and Volume03:43

Applications of the Ideal Gas Law: Molar Mass, Density, and Volume

63.7K
The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT,  suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume.
63.7K
Transcription Factors02:16

Transcription Factors

82.9K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
82.9K
Solution Concentration and Dilution02:59

Solution Concentration and Dilution

135.5K
The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
135.5K
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

36.2K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
36.2K
Factors Affecting Solubility04:01

Factors Affecting Solubility

37.3K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
37.3K

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Related Experiment Video

Updated: Feb 15, 2026

Author Spotlight: Insights into an Efficient Murine Maxillary Orthodontic Model Protocol
04:11

Author Spotlight: Insights into an Efficient Murine Maxillary Orthodontic Model Protocol

Published on: October 27, 2023

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Intraoral maxillary molar distalization.

Ingela Karlsson1, Lars Bondemark

  • 1National Health Service, Skane County Council, Orthodontics Clinic, Malmoe, Sweden.

The Angle Orthodontist
|November 9, 2006
PubMed
Summary

Distalizing maxillary first molars before second molars erupt is more effective. This approach significantly increases molar distal movement and reduces anchorage loss, leading to shorter treatment times.

Area of Science:

  • Orthodontics
  • Craniofacial development
  • Dental biomechanics

Background:

  • Maxillary molar distalization is a common orthodontic procedure.
  • Anchorage control is crucial for successful treatment outcomes.
  • The eruption stage of second molars can influence treatment efficiency.

Purpose of the Study:

  • To compare maxillary molar distalization and anchorage loss between two groups.
  • To evaluate the impact of second molar eruption on distalization effectiveness.

Main Methods:

  • Two groups of 20 patients each were studied: one before (MD 1) and one after (MD 2) second molar eruption.
  • Both groups used NiTi coil and Nance appliances for anchorage.
  • Key outcomes included treatment time, molar distalization, and incisor movement (anchorage loss).

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Designing CAD/CAM Surgical Guides for Maxillary Reconstruction Using an In-house Approach
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Designing CAD/CAM Surgical Guides for Maxillary Reconstruction Using an In-house Approach

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Methods for the Study of the Zebrafish Maxillary Barbel
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Methods for the Study of the Zebrafish Maxillary Barbel

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Related Experiment Videos

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Designing CAD/CAM Surgical Guides for Maxillary Reconstruction Using an In-house Approach
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Main Results:

  • Greater distal movement of first molars was observed in the MD 1 group (P < .01).
  • Significantly lower anchorage loss occurred in the MD 1 group (P < .01).
  • Molar distalization was significantly faster in the MD 1 group, with a two-fold higher movement rate (P < .001).

Conclusions:

  • Distalizing maxillary first molars prior to second molar eruption is more effective.
  • This timing optimizes treatment efficiency and anchorage preservation.