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The Spacing Index (TSI): A diagnostic classification for spaced dentitions
Minnie Lyons-Coleman1, Claire Bates1, Nicky Mandall1
1Tameside and Glossop Integrated Care NHS Foundation Trust, Manchester, UK.
Journal of Orthodontics
|August 9, 2025
Summary
The Spacing Index (TSI) is a valid and reliable tool for assessing orthodontic spacing. It accurately categorizes mild, moderate, and severe spacing, aiding in routine orthodontic assessments.
Area of Science:
- Orthodontics
- Dental Diagnostics
Background:
- Assessing dental spacing is crucial in orthodontic evaluations.
- A standardized index for categorizing spacing can improve diagnostic consistency.
Purpose of the Study:
- To evaluate the validity and reliability of The Spacing Index (TSI).
- To determine if TSI can accurately classify dental spacing as mild, moderate, or severe.
Main Methods:
- A diagnostic study involving 53 anonymized dental study models.
- Comparison of measurements using Vernier callipers (gold standard) against visual assessments by two raters.
- Intra-observer reliability assessed over a two-week period.
Main Results:
- The Spacing Index demonstrated substantial agreement (weighted kappa = 0.79) between the gold standard and test raters.
- Intra-observer reliability for the index exceeded 0.80, indicating near-perfect consistency over time.
Conclusions:
- The Spacing Index (TSI) is a valid and reliable method for categorizing dental spacing.
- TSI can be effectively integrated into routine orthodontic assessments.
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