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Changes in maximum lip-closing force after extraction and nonextraction orthodontic treatments

Korean Journal of Orthodontics 2020년 50권 2호 p.120 ~ 128
 ( Choi Tae-Hyun ) - Seoul National University Bundang Hospital Section of Dentistry Department of Orthodontics

김소현 ( Kim So-Hyun ) - Seoul National University Bundang Hospital Section of Dentistry Department of Orthodontics
김철 ( Kim Cheul ) - Gangneung-Wonju National University College of Dentistry Department of Oral Medicine and Diagnosis
국윤아 ( Kook Yoon-Ah ) - Catholic University Seoul St. Mary’s Hospital Department of Orthodontics
 ( Larson Brent E. ) - University of Minnesota School of Dentistry Division of Orthodontics
 ( Lee Nam-Ki ) - Seoul National University Bundang Hospital Section of Dentistry Department of Orthodontics

Abstract


Objective: The aims of the present study were to evaluate the changes in the maximum lip-closing force (MLF) after orthodontic treatment with or without premolar extractions and verify the correlation of these changes with dentoskeletal changes.

Methods: In total, 17 women who underwent nonextraction orthodontic treatment and 15 women who underwent orthodontic treatment with extraction of all four first premolars were included in this retrospective study. For all patients, lateral cephalograms and dental models were measured before (T0) and after (T1) treatment. In addition, MLF was measured at both time points using the Lip De Cum LDC-110R® device. Statistical analyses were performed to evaluate changes in clinical variables and MLF and their correlations.

Results: Both groups showed similar skeletal patterns, although the extraction group showed greater proclination of the maxillary and mandibular incisors and lip protrusion compared to the nonextraction group at T0. MLF at T0 was comparable between the two groups. The reduction in the arch width and depth and incisor retroclination from T0 to T1 were more pronounced in the extraction group than in the nonextraction group. MLF in the extraction group significantly increased during the treatment period, and this increase was significantly greater than that in the nonextraction group. The increase in MLF was found to be correlated with the increase in the interincisal angle and decrease in the intermolar width, arch depth, and incisor-mandibular plane angle.

Conclusions: This study suggests that MLF increases to a greater extent during extraction orthodontic treatment than during nonextraction orthodontic treatment.

키워드

Lip-closing force; Premolar extraction; Nonextraction orthodontic treatment; Dental arch morphology
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