Baburashraf Quraishi, Syed Sheeraz Hussain, Arif-ur Rehman Alvi.
Comparison Ofarch Width Dimensions Among Class I and Class II Division 1 Malocclusion Groups.
J Pak Dent Assoc Jan ;21(3):145-52.

OBJECTIVE The aimof this study is to 1) compare the arch width dimensions in adultswith Class I occlusion to those with Class II Division 1 malocclusion. 2) Compare and calculate difference between maxillary and mandibular archwidth in both groups. 3)Correlate archwidth dimensions for sexual dimorphismwithin the group & between groups. METHODOLOGY This was a cross- sectional study conducted atAlvi Dental Hospital & Fatima Jinnah Dental College. A total of 100 Class I subjects (43 males and 57 females) and 85 Class II division 1 (43 males and 42 females) patients, from 13- 24 years of age were included. The inclusion criteria was,(i) having all permanent teeth erupted from 1st molar to 1st molar,(ii) no history of previous orthodontic treatment. Patients with syndromes or grossly carious teeth and posterior cross- biteswere excluded. Intermolar, iniercanine, interalveolar width and arch lengthweremeasured in both arches. Students t- test was used to compare groups. RESULTS Meanmaxillary intermolar, intercanine&interalveolarwidth for Class I groupwas 51.6mm, 34.2mm and 59.5mmand forClass II division 1 itwas 49.2mm, 32.5mmand 57.2mm, respectively.Males of both the groupsexhibited larger arch width dimensions than the females indicating significant gender dimorphism. Mean intermolarwidth differencewas 1.2mmforClass I and -1.0 forClass II group CONCLUSIONS Maxillary dental arch is narrower in Pakistani adults with Class II Division 1 malocclusion, as intermolar, intercanine and interalveolar dimensionswere significantly smaller thanClass I sample (p=.000).Males of both the groups had larger archwidth dimensions than the females.Archwidth difference was negative for Class II group indicating posterior crossbite tendency.

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