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Comparison of Bolton Analysis Between Interproximal Stripping and Mandibular Incisor Extraction to Resolve Lower Anterior Crowding – A Cross-sectional Study By Dr. Mubassar Fida and Dr. Dr. Kanza Tahir Dr. Mubassar Fida graduated from Nishtar Medical College: Multan, Punjab, PK. Residency in Orthodontics from Alvi Dental Hospital: Karachi, Sindh, PK.Membership in Orthodontics European Orthodontic Society: London and American Association of Orthodontists: Creve Coeur, Missouri, US, and Fellowship in Orthodontics from College of Physicians. MS in community dentistry. He has authored many indexed original research articles and has also presented his work at various national and international forums. He has received numerous awards for his research presentations both internationally and nationally. Dr. Kanza Tahir graduated wrom Liaquat University of Medical and Health Sciences, Jamshoro in 2017. After passing her FCPS part-1, her interest in Orthodontics led her to acquire residency in a well-known institution of Pakistan. Currently, she is working on three research work projects related to orthodontics.
Abstract Background/Objective: The debate between the two treatments of crowding – whether to extract teeth or use a non-extraction method – has not yet seen a universal winner among modern orthodontists. This study aimed to evaluate the differences in Bolton Ratio (BR) of patients with mild-moderate crowding treated with mandibular incisor extraction or interproximal reduction passing the American Board of Orthodontics – Objective Grading System (ABO-OGS) criteria. Materials and methods: A cross-sectional study was conducted in a tertiary care hospital. Preand post-treatment dental casts were utilized to calculate the BR. Posttreatment dental casts and panoramic radiographs were used to determine the ABO-OGS scores of interproximal reduction (IPR) and mandibular incisor extraction (MIE) groups. A total sample size of 40 was required for the study with 20 cases in each group. The Wilcoxon signed-rank test was used to compare pre- and post-treatment Bolton changes. The MannWhitney U test was used for comparison between IPR and MIE group. Linear Regression was used to determine the association among variables. Results: In comparison between IPR and MIE groups, statistically significant differences (p ≤ 0.05) were seen in post-treatment anterior Bolton. Statistically significant differences were also reported for alignment, buccolingual inclinations, and occlusal contact scores. On linear regression, the difference in ABO-OGS scores increased by 4.4 units in the IPR group. Conclusions: Pre-treatment anterior maxillary excess led to increased overjet scores. Mandibular incisor extraction caused maxillary anterior Bolton excess which raised the overjet scores. Increased ABO-OGS alignment scores were found in the interproximal reduction group. Keywords: Mandibular crowding, ABO-OGS, Bolton analysis 40
*This article has been peer reviewed
