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ORIGINAL RESEARCH
Year : 2022  |  Volume : 14  |  Issue : 2  |  Page : 189-194

Comparative evaluation of stability of mandibular anterior crowding correction done with two different treatment protocols: A retrospective study


Department of Orthodontics and Dentofacial Orthopedics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India

Correspondence Address:
Dr. Purva Verma
Department of Orthodontics and Dentofacial Orthopedics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jioh.jioh_260_21

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Aim: To assess and compare 1-year treatment stability after correction of lower anterior crowding with nonextraction approach using passive self-ligation appliance and lower incisor extraction protocol with conventional ligation approach. Materials and Methods: This retrospective study included total 32 subjects. The inclusion criteria of the study were adult subjects with class I skeletal and dental malocclusion with mild-to-moderate mandibular anterior crowding of 4–6 mm. Subjects were divided into two groups: Group A treated with passive self-ligation nonextraction protocol (n = 15) and Group B treated with conventional ligation lower incisor extraction protocol (n = 17). The primary outcomes were the changes in arch dimension and dental crowding at three time points. Changes in intermolar width (IMW), intercanine width (ICW), little’s irregularity index, and mandibular incisor inclination at T0 (pretreatment), T1 (postdebonding), and T2 (1-year postdebonding) were evaluated. Descriptive statistics, normality tests, and intergroup comparison (independent t test) were performed. Results: Change in IMW was similar in both groups with no significant difference at T1 and T2. Change in ICW at T1 was significantly higher in Group A (2.01 mm) than Group B where ICW decreased by 0.94 mm. The relapse in ICW was significantly more in Group A. Difference in relapse of lower incisor crowding and inclination was significant between groups and it was more in Group A (P < .05). Conclusion: Orthodontic treatment with lower incisor extraction protocol with conventionally ligated approach has stable treatment outcomes than with nonextraction approach using passive self-ligation appliance Class I cases with moderate-to-severe mandibular anterior crowding.


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