Comparative Study of Soft Tissue and Hard Tissue Variables Correlation between Two Different Racial groups: A Canonical study

Aims: The purpose of this study was to investigate the correlation between dental, skeletal, and soft tissue variables and compare the results with Saudi study and other previous studies. Material and Method: The sample size consisted of 29 adult Sudanese patients (ages 18 to 25) seeking orthodontic treatment, and 19 variables were examined. The error of the method was assessed using Student's t-test, and canonical correlation analysis was used to analyze the correlation between soft and hard tissues. Results: The study found that the Sudanese population had higher mean values in dental and soft tissue variables compared to the Saudi population, while similar mean values were found in the skeletal sagittal relationship, except for the vertical relationship, where the Saudi population had a higher tendency for an open basal configuration. The canonical analysis revealed that the upper and lower incisors' inclinations had a strong negative loading, while the nasolabial angle and lower lip thickness and position had moderate loading. Conclusion: These findings show the impact of these variables which can help the clinician in diagnosis, prediction and assessment of post treatment changes. Additionally, the multivariate statistical analysis extracted a clinically significant association between soft tissue and hard tissue.