Abstract
Objective
This retrospective study aimed to compare the occlusal and dentoskeletal initial features of patients treated with four first premolar extractions in the 1970s and after 2000.
Materials and methods
Group 70′ was composed by 30 subjects with Class I malocclusion (mean age of 12.8 years, 10 male, 20 female) treated in the 1970s with four first premolar extractions and comprehensive orthodontic treatment. Group NM comprised 30 subjects with Class I malocclusion (mean age of 13.4 years, 13 male, 17 female) treated in the new millennium, similarly to Group 70′. Initial dental models and lateral cephalograms were digitized and measured using OrthoAnalyzerTM 3D software and Dolphin Imaging 11.0 software, respectively. Initial occlusal and dentoskeletal features were analyzed and compared. Intergroup comparison was performed using t tests (p < 0.05). Holm-Bonferroni correction for multiple comparison was applied.
Results
Group NM showed significantly greater maxillary and mandibular effective lengths and greater maxillary and mandibular incisor protrusion in comparison with Group 70′. Group NM presented a significantly greater lower anterior facial height. Group NM also showed significantly smaller nasolabial angle and protruded inferior lip.
Conclusion
Patients with Class I malocclusion treated with four first premolar extractions in the new millennium present a greater degree of dental and labial protrusion, increased lower anterior facial height, and more acute nasolabial angle compared with patients treated similarly in the 1970s. Greater dental and labial protrusion determines first premolar extractions in the new millennium.
Clinical relevance
Despite the decrease of tooth extraction frequency, four first premolar extractions may be justified in cases with severe dental and skeletal protrusions.
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The authors would like to thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.
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This study was financially supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - (CAPES) - Finance Code 001.
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In this article, all procedures involving human participants were in accordance with the ethical standards of the Research Ethics Committee of Bauru Dental Scooll, University of São Paulo (#71638417.9.0000.5417).
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This article is based on research submitted by Dr. Rodrigo Naveda in partial fulfillment of the requirements for the M.Sc. degree in Orthodontics at Bauru Dental School, University of São Paulo.
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Naveda, R., Janson, G., Natsumeda, G.M. et al. Pretreatment dentoskeletal comparison between individuals treated with extractions in the 1970s and in the new millennium. Clin Oral Invest 25, 1997–2005 (2021). https://doi.org/10.1007/s00784-020-03508-w
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DOI: https://doi.org/10.1007/s00784-020-03508-w