The relationship between corresponding upper buccal cusp distance (IBD) and Gothic arch width, inter - condylar width (ICW) and inter-upper canine distance (ICD) in an Iranian population

The relationship between corresponding upper buccal cusp distance (IBD) and Gothic arch width, inter - condylar width (ICW) and inter-upper canine distance (ICD) in an Iranian population Dr. H. Dorriz* - Dr. A. Mohammadi** *- Assistant Professor of Prosthodontics Dept. – Faculty of Dentistry – Tehran University of Medical Sciences. **- Resident of Prosthodontics Dept. – Faculty of Dentistry – Mashhad University of Medical Sciences. Background and Aim: The aim of this study was to assess the relationship between corresponding upper buccal cusp distance (IBD) with Gothic arch width, inter-condylar width (ICW) and inter-upper canine distance (ICD) in an Iranian population. Materials and Methods: In this cross sectional investigation, subjects consisted of 42 adults with intact dentitions and class I occlusion, with no history of orthodontic treatment and TMJ disorders. Study casts were made from alginate impressions taken from maxillary teeth. Gothic arch tracing was performed and arbitrary hinge axes were determined on both sides. The distance between these points was recorded as the inter-condylar width (ICW) using a facebow. The Gothic arch width, ICW, IBD and ICD were measured by a vernier caliper. Pearson correlation test was used for statistical analysis (P≤0.05). Results: A significant correlation was not observed between the Gothic arch width and IBD. The correlation between IBD, ICW and ICD was highly significant (P<0.01). Conclusion: Based on the results of the present study, the position of the maxillary teeth can be determined by measuring ICW or ICD. Key words: Gothic arch - Intercondylar width - Buccolingual tooth position - Nautral zone