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Methods used to evaluate growth modification in Class II malocclusion.

J F Tulloch1, W Medland, O C Tuncay

  • 1Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|October 1, 1990
PubMed
Summary

Evaluating orthodontic treatments for Class II malocclusion is challenging due to study design limitations. Current research lacks robust methodology, preventing definitive conclusions on treatment effectiveness for improving patient growth.

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Area of Science:

  • Orthodontics
  • Craniofacial Growth
  • Evidence-Based Dentistry

Background:

  • Methodological variations in orthodontic studies significantly impact findings.
  • High patient variability and small mean changes complicate treatment response assessment.

Purpose of the Study:

  • To systematically review research designs and reporting practices in studies of Class II malocclusion treatment.
  • To assess the quality of evidence regarding orthodontic interventions on craniofacial growth.

Main Methods:

  • Systematic review of 50 studies published between 1980-1987 in major orthodontic journals.
  • Analysis of study variables including appliance systems, patient selection, comparison groups, and statistical methods.

Main Results:

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  • Most studies lacked prospective design and random assignment.
  • Inconsistent reporting on patient selection, treatment modifications, and data loss was common.
  • Statistical analyses often failed to control for multiple comparisons or estimate power.

Conclusions:

  • The quality of research on Class II malocclusion treatment is generally weak.
  • Inconclusive evidence exists regarding the influence of orthodontic treatment on Class II patient growth due to methodological limitations.