Korean J Orthod.  2017 Mar;47(2):142-147. 10.4041/kjod.2017.47.2.142.

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

• Kang SJ
• Kim HH
• Hwang HS
• Lee KM

• KMID: 2400391
• DOI: http://doi.org/10.4041/kjod.2017.47.2.142

Abstract

The purpose of this study was to investigate immediate changes in the mandibular dentition after maxillary molar distalization using headgear in non-growing patients. Sixteen patients (mean age, 18.9 ± 2.0 years) with Class II molar relationship and crowding were included in the present study. To correct the molar relationship, headgear was used for maxillary molar distalization. Cone-beam computed tomography-generated half-cephalograms (CG Cephs) and dental casts were used to evaluate dental changes for each subject before and immediately after molar distalization using headgear. The mean duration that subjects wore the headgear was 6.3 months. CG Cephs showed that the first maxillary molars were distalized 4.2 ± 1.6 mm with 9.7°± 6.1° of distal angulation. The intercanine, interpremolar, and intermolar widths of the mandible increased after maxillary molar distalization. The present study's results suggest that maxillary molar distalization using headgear induces a spontaneous response in the untreated mandibular dentition of non-growing patients.

Keyword

Molar distalization; Mandibular dentition; Cone-beam computed tomography-generated half cephalograms

MeSH Terms

Dentition*
Humans
Malocclusion
Mandible
Molar*

Figure

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  Figure 1 Measurements used in this study. A, Cone-beam computed tomography-generated half-cephalogram (CG Ceph) measurements for maxillary molar distalization, maxillary molar angulation, and mandibular incisor inclination (IMPA). On the CG Ceph, a horizontal reference line (X line) was established parallel to the head posture aligner after 3-dimensional superimposition of the two volume data sets. The vertical reference line (Y line) was perpendicular to the horizontal reference line (X line), which passed through A point. B, Model measurements for assessing the mandibular dental changes.

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