[A comparative study of five indices in malocclusion for evaluating treatment needs]

Area of Science:

• Dentistry
• Orthodontics
• Dental Public Health

Background:

• Malocclusion assessment is crucial for determining orthodontic treatment necessity.
• Several indices exist, but their clinical utility and efficiency vary.
• Objective evaluation of malocclusion indices is needed to guide treatment decisions.

Purpose of the Study:

• To evaluate the effectiveness of five malocclusion indices (NMT, MI, HLDI, OFI, DI) in assessing orthodontic treatment needs.
• To compare the diagnostic accuracy (sensitivity and specificity) of these indices against an orthodontist's assessment.
• To determine the most suitable index for routine clinical screening.

Main Methods:

• Five malocclusion indices were used to score 40 female subjects (ages 18-23).
• Scores from one dentist were compared with a second orthodontist's treatment needs assessment.
• Sensitivity, specificity, and screening level scores were calculated for each index.

Main Results:

• The MI index showed the highest resemblance to the orthodontist's assessment, followed by NMT and DI.
• DI was found to be more time-efficient than MI, and NMT had lower reproducibility than DI.
• DI demonstrated a strong correlation with arch length discrepancy (r = -0.898), particularly in subjects with crowding.

Conclusions:

• The Dental Index (DI) is suggested as a suitable index for evaluating orthodontic treatment needs, especially for managing dental crowding.
• DI offers a balance of accuracy and efficiency for screening malocclusion.
• Further research may validate DI's utility across diverse populations and malocclusion types.