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Evaluation of orthodontic treatment outcome in extraction and non- extraction protocols with abo objective grading system

Author: 
Mrudul Vaidya, Jyothikiran, H, Raghunath, N. and Pratham Pai
Subject Area: 
Health Sciences
Abstract: 

Introduction & Objectives: The extraction versus non-extraction controversy is the oldest as well as the most enduring controversy and still remains a topic of debate in the field of orthodontics. The “American Board of Orthodontics” (ABO-1998) introduced an index called the Objective Grading System (OGS) which evaluates post treatment dental casts and panoramic radiographs. It assesses the final occlusion in first, second and third orders according to eight different occlusal components. The aim of the present study was to evaluate the treatment outcome of extraction and non-extraction cases in borderline cases by ABO-OGS system. Methodology: 40 borderline orthodontic patients with Angle’s Class I malocclusion with an age group of 13-20 years were selected and equally divided into two groups: 20 patients were treated by extraction of all first premolars and 20 patients with a non-extraction treatment protocol. MBT 0.022” slot prescription was used for all 40 patients. With the aid of an ABO measuring gauge and panoramic radiographs, the total OGS scores between the two groups were calculated and compared using Student t-test. Results: The mean OGS scores were significantly less negative in the extraction group (-22.0± 2.29) as compared to the non–extraction group (-26.80 ± 5.18, p < 0.005). Conclusion: According to this study, in the borderline cases, the final occlusion and radiographical characteristics were more acceptable in the patients treated with extraction than the non-extraction patients.

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