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相关概念视频

Crossover Experiments01:16

Crossover Experiments

2.7K
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.
Crossover designs are performed even with smaller sample sizes since the samples can act as their controls. These are better than simple randomized trials since patients are exposed to all the treatments.
2.7K
Group Design02:01

Group Design

8.9K
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...
8.9K
Randomized Experiments01:13

Randomized Experiments

6.8K
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
Simple...
6.8K

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相关实验视频

Updated: Jun 14, 2025

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

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空间关闭与不同的约会间隔:一个分口随机控制试验.

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
概括

较短的2周重新激活间隔用于狗的收缩可能会加快空间的关闭. 这种正牙技术,使用临时固装置,有效地控制了固损失.

关键词:
失去了安克雷奇的损失狗的收缩 狗的收缩ортодонтических 空间关闭闭的地方.重新激活的时间间隔.临时安装装置的临时安装装置.

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科学领域:

  • 矯正牙科 矯正牙科是一種矯正牙科.
  • 牙科机械 牙科机械

背景情况:

  • 狗牙收缩是一个关键的正牙手术.
  • 传统的重新激活间隔在4-8周之间.

研究的目的:

  • 评估不同的重新激活间隔如何影响狗狗收缩期间空间关闭率.

主要方法:

  • 一个分裂口腔随机临床试验,涉及38名接受前提取的患者.
  • 狗狗收缩使用弹性链,每2,4,6或8周重新激活一次.
  • 临时固定装置确保了最大限度的固定控制.

主要成果:

  • 在每月的狗收缩率或第一个骨月经漂移中没有发现显著差异.
  • 两周的重新激活组实现了空间关闭显著更快 (平均5.74个月).

结论:

  • 两周的重新激活间隔可能会加快狗狗收缩中的空间关闭.
  • 迷你螺杆支的 anchorage有效地减少了 anchorage的损失.