Immediate changes in the mandibular dentition after maxillary molar distalization using headgear

Kang, Sung-Ja; Kim, Hyun-Hee; Hwang, Hyeon-Shik; Lee, Kyung-Min

doi:10.4041/kjod.2017.47.2.142

Cited by 8 publications

(7 citation statements)

References 16 publications

(16 reference statements)

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“…The lengthening and widening of the maxillary dental arch as a consequence of CH treatment can cause spontaneous space correction in the mandibular dental arch. This phenomenon is followed by widening of the mandibular arch (4)(5)(6)(7)9). A similar spontaneous effect on the mandibular arch has also been reported after Haas-type maxillary expansion (10,11).…”

Section: Introductionsupporting

confidence: 57%

Dental arch effects after early and later timed cervical headgear treatment—a randomized controlled trial

Hannula

Pirilä-Parkkinen

Tolvanen

et al. 2019

European Journal of Orthodontics

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Summary Background Cervical headgear (CH) is a commonly used orthodontic appliance and its dentoalveolar changes are known. However, the effects related to gender and timing have gained less attention. Objectives To examine dimensions of dental arches among children with Class II occlusion without posterior mandibular rotation according to timing of Kloehn-type CH treatment. Trial design Prospective, randomized, parallel-group controlled trial. Methods Sixty-seven seven-year-old children with a Class II occlusion were included in the study. The children were randomized into two equal-size groups in 1:1 ratio by sealed-envelope randomization. The early group (EG, n = 33) was treated between T0 and T1 (26 months), right after eruption of the first maxillary molars. The late group (LG, n = 34) was treated between T1 and T2 (24 months). The children were treated with CH until normal Class I occlusion on first molars was achieved. Impressions for dental casts were taken from all participants at T0, T1, and T2. Blinding was applicable for outcome assessors. Changes in dental cast measurements were compared between the groups and genders using t-test, Mann-Whitney U-test, and repeated measures analysis of variance. Results Of the children, 56 completed the study. The maxillary arch length and the transversal changes between the upper canines and upper first molars were significantly increased in EG at T0−T1 (P < 0.001). At T2, the transversal dimension between the upper first molars was larger (P < 0.05), and in the lower arch the mandibular arch length (P < 0.05) and the transversal dimension between the lower first molars (P < 0.01) were increased in EG males compared to LG males. No harms were encountered. Conclusions The male gender benefits most from early timing of the CH treatment, showing larger dimensions at the end of the follow-up. The results clearly indicated a wider and longer upper dental arch and spontaneous expansion of the lower dental arch after treatment. Clinical Registration NCT02010346.

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Section: Introductionsupporting

confidence: 57%

Dental arch effects after early and later timed cervical headgear treatment—a randomized controlled trial

Hannula

Pirilä-Parkkinen

Tolvanen

et al. 2019

European Journal of Orthodontics

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“…In the HG therapy, expansion of the inner facebow arch can be applied up to 10 mm in order to broaden the upper dental arch while achieving at the same time as distal movement of the first molars and restriction of forward displacement of the maxilla ( 15 , 25 , 40 ). Widening of the maxillary molars has been found to lead to spontaneous buccal tipping of the mandibular molars, supposedly due to occlusal factors, and eventually to mild changes in the mandibular dental arch width ( 15 , 20 , 22 , 27 , 41 , 52 ). This study is in agreement with the previous studies.…”

Section: Discussionmentioning

confidence: 99%

Effects of force magnitude on dental arches in cervical headgear therapy

Talvitie

Helminen

Karsila

et al. 2021

European Journal of Orthodontics

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Summary Aim To study the influence of different force magnitudes on dental arches in cervical headgear (CHG) treatment. Material and methods In this controlled clinical trial, patients (n = 40) were treated with CHG with light (L, 300 g, n = 22) or heavy force (H, 500 g, n = 18) magnitude. Subjects were asked to use CHG for 10 hours a day for 10 months. The outer bow of the CHG facebow was raised 10–20 degrees and the inner bow expanded 3–4 mm. Adherence to instructions and force magnitude were monitored with an electronic module (Smartgear, Swissorthodontics, Switzerland). Impressions for study models were taken before (T1) and after (T2) treatment and the study models were scanned into digital form (3Shape, R700 Scanner, Denmark). Measurements were made using the digital models (Planmeca Romexis, Model analyser, Finland). Results During the treatment (T1–T2) the upper inter-canine distance increased by 2.83 mm (P = 0.000) and 2.60 mm (P = 0.000) in the L and H force magnitude groups, respectively. Upper inter-molar width increased by 3.16 mm (P = 0.000) and 2.50 mm (P = 0.000) in the L and H groups, respectively. Maxillary total arch perimeter increased by 6.39 mm (P = 0.001) and 6.68 mm (P = 0.001) in the L and H groups, respectively. In the amount of change over time, T1–T2, in the upper arch measurements, no significant difference was found between the groups. Lower inter-canine width increased by 0.94 mm (P = 0.005) and 1.16 mm (P = 0.000) in the L and H groups, respectively; no difference between the groups. Lower inter-molar distance increased by 2.17 mm (P = 0.000) and 1.11 mm (P = 0.008) in the L and H groups, respectively. At the end of the study, upper and lower inter-molar width was larger in the L group than in the H group (P = 0.039 and P = 0.022, respectively). Conclusion CHG therapy is an effective method for expanding and releasing moderate crowding of the upper dental arch. The lower arch spontaneously follows the upper arch in widening effects, and minor expansion can also be seen on the lower arch. In the L group, larger inter-molar width was achieved on the upper and lower arch; probably due to better adherence to instructions. Light force is recommended for use in CHG therapy.

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“…Moreover, additional advantages of distalising the dentitions rather than premolar extractions include the preservation of a complete dentition, the ease of root position control, the convenience of controlling the amount of anterior tooth retraction, as well as good patient acceptance. 17 The Invisalign system has become increasingly popular, especially for adult patients, [18][19][20] since it was first introduced in 1997, due to the advantages of aesthetics and comfort in comparison with fixed appliances. 21 The clinical efficiency of clear aligner treatment, including molar distalisation, has been confirmed and it has been further suggested that tooth movement, such as incisor torque, premolar derotation and molar distalisation, can be effectively performed using the Invisalign system.…”

Section: Discussionmentioning

confidence: 99%

Distalisation of the dental arches using clear aligners and miniscrews

Yang

et al. 2021

Australasian Orthodontic Journal

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The distalisation of molars using clear aligners has been found to be achievable; however, the distalisation of an entire arch is still an orthodontic challenge and reported as only clinically possible using fixed appliances. To date, there has been no study on the distalisation of both dental arches using a clear aligner system. In the present report, a case is described in which the entire maxillary and mandibular arches were successfully distalised using clear aligners and miniscrews for the treatment of a bimaxillary protrusion malocclusion in a 22-year-old female patient. Pre-and post-treatment records as well as 1.5-year follow-up records are presented. Results: The distalisation of both dental arches was achieved using a V-pattern staging process by moving the second molars, then the first molars, followed by the premolars and the anterior teeth, as well as by elastics applied between precision cutouts in the aligners and the miniscrews. The dental arches were efficiently distalised by approximately 3 millimeters in the first molar areas after 13 months of treatment. A review 1.5 years post-treatment showed that the outcome was stable without significant relapse observed in the facial profile and occlusion. Conclusion:The distalisation of both dental arches is achievable using clear aligner systems by applying elastics between miniscrews and precision aligner cutouts in the treatment of a bimaxillary protrusion malocclusion.

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Immediate changes in the mandibular dentition after maxillary molar distalization using headgear

Cited by 8 publications

References 16 publications

Dental arch effects after early and later timed cervical headgear treatment—a randomized controlled trial

Dental arch effects after early and later timed cervical headgear treatment—a randomized controlled trial

Effects of force magnitude on dental arches in cervical headgear therapy

Distalisation of the dental arches using clear aligners and miniscrews

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