Assessment of arch width changes in Class I and Class II Division 1 patients treated with fixed orthodontics

Authors

DOI:

https://doi.org/10.3126/jgmcn.v14i1.37023

Keywords:

Inter-molar width, inter-canine width, pre-treatment, post-treatment

Abstract

Background: The orthodontic treatment should aim to maintain the inter-canine and inter-molar width to that of the pre-treatment values. The study was conducted with objective to evaluate arch width changes in Class I and Class II patients treated with fixed orthodontics.

Methods: This was a hospital-based cross-sectional study with two study groups. The first group included patients with Class I malocclusion, treated with four first premolar extractions and the second group included patients with Class II Div 1 malocclusion, treated with upper two first premolar extractions. The inter-canine and inter-molar width of the pre and post-treatment study model were measured. To compare the changes observed amongst two groups, independent samples t-test was performed. A paired sample t-test was used to evaluate the treatment changes within each group.

Results: There was significant increase in inter-canine width in both maxillary and mandibular arches in both the groups. In Class I extraction group there was significant decrease in the inter-molar width in both maxillary and mandibular arches. The Class II Div1 maxillary extraction group also showed significant increase in inter-canine width in both maxillary and mandibular arches. In the same group there was decrease in post treatment

Methods: This was a hospital-based cross-sectional study with two study groups. The first group included patients with Class I malocclusion, treated with four first premolar extractions and the second group included patients with Class II Div 1 malocclusion, treated with upper two first premolar extractions. The inter-canine and inter-molar width of the pre and post-treatment study model were measured. To compare the changes observed amongst two groups, independent samples t-test was performed.  A paired sample t-test was used to evaluate the treatment changes within each group.

Results: There was significant increase in inter-canine width in both maxillary and mandibular arches in both the groups. In Class I extraction group there was significant decrease in the inter-molar width in both maxillary and mandibular arches. The Class II Div1 maxillary extraction group also showed significant increase in inter-canine width in both maxillary and mandibular arches. In the same group there was decrease in post-treatment inter-molar width in both arches with significant decrease in the maxillary inter-molar width.

Conclusion: There was increase in inter-canine width in both Class I extraction group and Class II Div 1 maxillary extraction group with decrease in inter-molar width in both the groups.

 

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Author Biographies

Umesh Parajuli, College of Dental Surgery, Gandaki Medical College, Nepal

Department of Orthodontics

Manish Bajracharya, National Academy of Medical Sciences, Bir hospital

Department of Orthodontics

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Published

2021-06-13

How to Cite

Parajuli, U., Bajracharya, M., Pandey, M., Gurung, I., & Tuladhar, S. L. (2021). Assessment of arch width changes in Class I and Class II Division 1 patients treated with fixed orthodontics. Journal of Gandaki Medical College-Nepal, 14(1), 3–7. https://doi.org/10.3126/jgmcn.v14i1.37023

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Original Articles