University of Oulu

Tuula Talvitie, Mika Helminen, Susanna Karsila, Reeta Varho, Luca Signorelli, Pertti Pirttiniemi, Timo Peltomäki, The impact of force magnitude on the first and second maxillary molars in cervical headgear therapy, European Journal of Orthodontics, Volume 43, Issue 6, December 2021, Pages 648–657, https://doi.org/10.1093/ejo/cjab010

The impact of force magnitude on the first and second maxillary molars in cervical headgear therapy

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Author: Talvitie, Tuula1,2; Helminen, Mika3,4; Karsila, Susanna5;
Organizations: 1Oral Diseases, The Hospital District of South Ostrobothnia, Seinäjoki, Finland
2Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
3Tays Research Services, Tampere University Hospital, Tampere, Finland
4Faculty of Social Sciences, Health Sciences, Tampere University, Tampere, Finland
5Dental Teaching Unit, Turku Municipal Health Care Services, Turku, Finland
6Private practice, Wil, Switzerland
7Department of Oral Development and Orthodontics, Research Unit of Oral Health Sciences, University of Oulu, Finland
8Medical Research Center, Oulu University Hospital, Oulu, Finland
9Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
10Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland
11Department of Ear and Oral Diseases, Tampere University Hospital, Tampere, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2023021326880
Language: English
Published: Oxford University Press, 2021
Publish Date: 2023-02-13
Description:

Abstract

Aim: To study the effect of force magnitude on the maxillary first and second molars in cervical headgear (CHG) therapy.

Material and methods: In this controlled clinical trial, patients (n = 40) were treated with CHG with a light (L, 300 g, n = 22) or a heavy force (H, 500 g, n = 18) magnitude. The subjects were asked to wear CHG for 10 hours a day for 10 months. The outer bow of the CHG facebow was lifted up for 10–20 degrees and the inner bow was expanded 3–4 mm. Adherence to instructions and force magnitude were monitored using an electronic module (Smartgear, Swissorthodontics, Switzerland). Panoramic and lateral radiographs before (T1) and after treatment (T2) were analysed using a Romexis Cephalometric module (Planmeca, Finland) focussing on the angular, sagittal, and vertical positions of the permanent first and second molars.

Results: According to the cephalometric analysis of the maxillary first and second molars, distal tipping occurred during T1–T2 in the H group (P = 0.010 and 0.000, respectively), and the change was greater in the H group compared to the L group (P = 0.045 and 0.019, respectively). Based on the panoramic analysis, tipping occurred in the distal direction during therapy in the H group in the second molars compared to the midline or condylar line (P = 0.001 and 0.001; P = 0.008 and 0.003 on the right and left, respectively).

Conclusions: With heavy force magnitude, the maxillary first and second molars can tilt more easily in the distal direction even if the CHG was used less. Distal tipping of the molar can be considered to be a side effect of CHG therapy.

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Series: European journal of orthodontics
ISSN: 0141-5387
ISSN-E: 1460-2210
ISSN-L: 0141-5387
Volume: 43
Issue: 6
Pages: 648 - 657
DOI: 10.1093/ejo/cjab010
OADOI: https://oadoi.org/10.1093/ejo/cjab010
Type of Publication: A1 Journal article – refereed
Field of Science: 313 Dentistry
Subjects:
Copyright information: © The Author(s) 2021. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oup.com. This is a pre-copyedited, author-produced version of an article accepted for publication in European Journal of Orthodontics following peer review. The version of record Tuula Talvitie, Mika Helminen, Susanna Karsila, Reeta Varho, Luca Signorelli, Pertti Pirttiniemi, Timo Peltomäki, The impact of force magnitude on the first and second maxillary molars in cervical headgear therapy, European Journal of Orthodontics, Volume 43, Issue 6, December 2021, Pages 648–657 is available online at: https://doi.org/10.1093/ejo/cjab010.