Evaluating the Lower Anterior Facial Height in Patients Treated with Extraction Versus Non-extraction Fixed Mechanotherapy: “A Systematic Review and Meta-analysis”

• Published in: Journal of Indian Orthodontic Society Vol. 55; no. 4; pp. 355 - 366
• Main Authors: Jain, Atam Dev, Goyal, Manish, Kumar, Mukesh, Premsagar, Shruti, Mishra, Shalini, Tomar, Sumit
• Format: Journal Article
• Language: English
• Published: New Delhi, India SAGE Publications 01-10-2021
• Subjects: meta-analysis; lower anterior facial height; First premolar extraction v/s non-extraction; systematic review
• ISSN: 0301-5742; 0974-9098
• DOI: 10.1177/03015742211011689

Objective:
The objective of this study was to evaluate the effects of the four first premolars extraction compared with a non-extraction treated control group on the lower anterior facial height.
Methods:
Electronic search was conducted on PubMed, Cochrane, Scopus, Lilacs, Scielo, clinical trials, and opengrey.eu databases; only article published in English were included. The eligibility criteria were extraction of four first premolars compared with a non-extraction control group treated with fixed mechanotherapy. Anterior Nasal Spine to Menton (ANS-Me) (mm) was taken as the primary outcome; Frankfurt mandibular plane angle (FMA) and Nasion to Menton (N-Me) were selected as secondary outcomes. Non-randomized Studies-of Intervention (ROBINS-I) tool was used for the quality assessment and risk of bias. Heterogeneity was analyzed using statistical tests, including chi-squared-based Q-statistic, tau-square, and I-squared statistics. Review Manager was used for quantitative assessment and meta-analysis.
Results:
Five retrospective studies were included for quantitative assessment and three were included in the meta-analysis due to certain missing data. Extraction of four first premolars did not affect both primary and secondary outcomes with P = .65, P = .93, and P = .91, respectively, for ANS-Me, FMA, and N-Me.
Conclusion:
This review and meta-analysis concluded that there was no statistically significant effect of extraction of four first premolars on lower anterior facial height.