Establishing a Standard Transverse Maxillary Dimension on Study Casts Using the Intermolar-to-Intercanine Width Ratio: A Pan-India Study.

Background: Evaluation of maxillary width holds significant clinical importance in identifying developmental abnormalities, aiding in orthodontic diagnosis and treatment planning, providing ethnicity-specific data, and supporting forensic applications. Still, research on maxillary growth in transverse dimension is limited due to a lack of standardized diagnostic criteria and methods for defining normalcy. Addressing these gaps, this study aimed to establish a standard transverse maxillary dimension using the intermolar (IMW)-to-intercanine (ICW) width ratio determined on a large, homogeneous sample of dental Class I well-aligned arches with Little's irregularity index 1 or 2 across India.