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Determination of normal maxillary transverse dimension by using intercanine width and interpalatal first molar width
Alka M Banker1, Jayasankar P Pillai2, Kinjal D Patel3
1Department of Orthodontics, Goenka Research Institute of Dental Science, Gujarat University, Gandhinagar, Gujarat, India.
Summary
A new ratio for inter-palatal molar width (IPMW) to intercanine width (ICW) helps identify normal dental arches. This simple method aids clinicians in diagnosing transverse malocclusion, improving treatment planning.
Area of Science:
- Orthodontics
- Dental Morphology
- Biometrics
Background:
- Diagnosing transverse plane malocclusion is challenging due to a lack of defined criteria for normal occlusion.
- Existing methods for assessing transverse dimensions are complex or invasive.
Purpose of the Study:
- To establish a reliable ratio for defining normal transverse occlusion.
- To develop a simple, non-invasive method for identifying normal and deficient dental arches.
Main Methods:
- Retrospective analysis of 151 maxillary dental models (ages 12-16).
- Measurement of intercanine width (ICW) and inter-palatal molar width (IPMW).
- Statistical analysis using SPSS with Chi-square test (p ≤ 0.05).
Main Results:
- A normal inter-palatal molar width (IPMW) to intercanine width (ICW) ratio of 1:1 ± 0.05 was observed in 98.60% of normal arches.
- Criteria for normal arches: IPMW ≥ 37.45 mm.
- Criteria for deficient arches: IPMW-to-ICW ratio of 1.15:1 ± 0.05 or more, with IPMW < 34.92 mm.
Conclusions:
- The IPMW-to-ICW ratio effectively differentiates normal from deficient dental arches.
- Banker's hypothesis provides an easy, non-invasive clinical tool for assessing transverse dimensions.
- This ratio aids clinicians in diagnosing transverse malocclusion.
