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relationship among dental crowding, maxillary and mandibular base lengths and naso-labial angle in untreated class I and class II subjects in mandi Gobindgarh population

Aims: A study was conducted to find out a relationship among maxillary and mandibular base lengths, dental crowding and naso-labial angle in untreated Class I and Class II subjects in Mandi Gobindgarh, Punjab, population. Study design: Cross sectional Place of Study: Department of Orthodontics and Dentofacial Orthopaedics, Desh Bhagat Dental College and Hospital, Desh Bhagat University Campus, Mandi Gobindgarh, Punjab. Methodology: This study included 60 pre-treatment lateral cephalograms and study models (28 class I & 32 class II) of untreated subjects with complete bilateral dental class I and complete bilateral dental class II malocclusion having all permanent teeth mesial to 1st molars & without any proximal decay and restorations. The maxillary and mandibular base lengths (Co-A and Co-Gn) and naso-labial angle were measured on pre-treatment lateral cephalogram & the tooth size-arch length discrepancies were measured on the pre-treatment dental casts. The measurements obtained from Class I and Class II subjects were further divided into two Groups each depending upon the severity of dental crowding. The obtained data was analyzed statistically with t-test and Pearson correlation coefficient (P=.05) to investigate any correlation between base length and dental crowding.