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Clinical Trials: Overview01:11

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Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
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Clinical Trials01:16

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Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
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Study Designs in Epidemiology01:20

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Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
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Community Based Intervention01:30

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Community-based interventions in mental health represent a paradigm shift from institution-centered care to treatments embedded within the fabric of local communities. By prioritizing inclusion and leveraging existing societal structures, this approach fosters a supportive environment conducive to addressing mental health challenges while promoting individual dignity and agency.
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Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

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Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
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Bias in Epidemiological Studies01:29

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Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:  
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Related Experiment Video

Updated: Sep 20, 2025

Oral Biofilm Sampling for Microbiome Analysis in Healthy Children
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COVID-19 Impact on Community-Based Participatory Randomized Controlled Trials-Lessons From the Oral Health

Francisco J Ramos-Gomez1,2, Molly A Martin3, Suchitra S Nelson4

  • 1Department of Pediatric Dentistry, University of California, Los Angeles, Los Angeles, CA, United States.

Frontiers in Dental Medicine
|June 7, 2022
PubMed
Summary

The COVID-19 pandemic disrupted clinical trials, especially in dentistry, due to high transmission risks. This study details challenges faced by oral health researchers to prepare for future public health crises.

Keywords:
COVID-19behavioral scienceclinical trialscommunity-based participatory researchdentistryhealth disparitieshealth inequitiespandemic (COVID-19)

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Area of Science:

  • Oral Health Research
  • Clinical Trials
  • Public Health

Background:

  • The COVID-19 pandemic significantly impacted global science and industry.
  • Dental care faced high risks of viral transmission due to aerosol-generating procedures.
  • This created substantial challenges for dental providers, healthcare workers, patients, and researchers.

Purpose of the Study:

  • To describe the impact of the COVID-19 pandemic on community-based randomized clinical trials.
  • To highlight challenges faced by the Oral Health Disparities in Children (OHDC) Consortium.
  • To inform researchers about potential disruptions from future public health emergencies.

Main Methods:

  • Analysis of the effects of the COVID-19 pandemic on four specific community-based randomized clinical trials.
  • Qualitative and quantitative assessment of disruptions encountered.
  • Case study approach focusing on the OHDC Consortium.

Main Results:

  • Significant disruptions occurred in the conduct of clinical trials.
  • Aerosol-generating procedures in dentistry posed unique challenges for trial continuity.
  • Adaptations were necessary to mitigate pandemic-related impacts on research.

Conclusions:

  • The pandemic presented unprecedented challenges for oral health clinical trials.
  • Understanding these disruptions is crucial for maintaining research integrity during future crises.
  • Preparedness strategies are needed to ensure the resilience of clinical research.