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Related Concept Videos

Crossover Experiments01:16

Crossover Experiments

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Crossover experiments, also called the repeated-measurements design, is a study design in which all experimental units are exposed to all treatments in different periods. Crossover experiments are generally used in psychology, the pharmaceutical industry, agriculture, and medicine.
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Group Design02:01

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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
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Randomized Experiments01:13

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The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
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Related Experiment Video

Updated: Jun 14, 2025

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Space Closure with Different Appointment Intervals: A Split-mouth Randomized Controlled Trial.

Hend Salah ElSayed1, Amr Ragab El-Beialy2, Juan Martin Palomo3

  • 1Department of Orthodontics and Pediatric Dentistry, Oral and Dental Research Division, National Research Centre, Giza, Egypt.

Contemporary Clinical Dentistry
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

A shorter 2-week reactivation interval for canine retraction may speed up space closure. This orthodontic technique, using temporary anchorage devices, effectively controlled anchorage loss.

Keywords:
Anchorage losscanine retractionorthodontic space closurereactivation intervaltemporary anchorage devices

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Area of Science:

  • Orthodontics
  • Dental Mechanics

Background:

  • Canine retraction is a key orthodontic procedure.
  • Traditional reactivation intervals range from 4-8 weeks.

Purpose of the Study:

  • To assess how different reactivation intervals impact space closure rates during canine retraction.

Main Methods:

  • A split-mouth randomized clinical trial involving 38 patients undergoing premolar extraction.
  • Canine retraction utilized elastomeric chains with reactivation every 2, 4, 6, or 8 weeks.
  • Temporary anchorage devices ensured maximum anchorage control.

Main Results:

  • No significant differences were found in the monthly canine retraction rate or first molar mesial drift.
  • The 2-week reactivation group achieved space closure significantly faster (mean 5.74 months).

Conclusions:

  • A 2-week reactivation interval may expedite space closure in canine retraction.
  • Miniscrew-supported anchorage effectively minimizes anchorage loss.