Korean J Orthod.  2017 Sep;47(5):313-322. 10.4041/kjod.2017.47.5.313.

Stability of dental, alveolar, and skeletal changes after miniscrew-assisted rapid palatal expansion

• Lim HM
• Park YC
• Lee KJ
• Kim KH
• Choi YJ

• KMID: 2389147
• DOI: http://doi.org/10.4041/kjod.2017.47.5.313

Abstract

OBJECTIVE
Miniscrew-assisted rapid palatal expansion (MARPE) is a means for expanding the basal bone without surgical intervention in young adults. Here, we assessed the differences in dental, alveolar, and skeletal measurements taken before (T0), immediately after (T1), and 1 year after (T2) MARPE.
METHODS
Twenty-four patients (mean age, 21.6 years) who had undergone MARPE and cone-beam computed tomography at T0, T1, and T2 were included. Changes in the following parameters were compared using paired t-tests: intercusp, interapex, alveolar, nasal floor, and nasal cavity widths; inclination of the first molar (M1) and its alveolus; and thickness and height of the alveolar bone. A linear mixed-effects model was used to determine variables that affected periodontal changes in the M1.
RESULTS
MARPE produced significant increases in most measurements during T0-T2, despite relapse of some measurements during T1-T2. The alveolar thickness decreased on the buccal side, but increased on the palatal side. The alveolar crest level at the first premolar moved apically. Changes in the thickness and height of the alveolar bone were affected by the corresponding initial values.
CONCLUSIONS
MARPE can be used as an effective tool for correcting maxillomandibular transverse discrepancy, showing stable outcomes 1 year after expansion.

Keyword

Cone-beam computed tomography; Miniscrew-assisted rapid palatal expansion; Stability; Expansion

MeSH Terms

Bicuspid
Cone-Beam Computed Tomography
Humans
Molar
Nasal Cavity
Recurrence
Young Adult

Figure

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  Figure 1 Miniscrew-assisted rapid palatal expander. Left, before expansion; right, after expansion.

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  Figure 2 Measurements on the coronal images. A, Appliance expansion; B, interapex width; C, nasal cavity width (top), nasal floor width (middle), and alveolar width (bottom); D, alveolar inclination (left) and tooth inclination (right); E, buccal alveolar crest level.

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  Figure 3 Measurements on three-dimensional and axial images. A, Intercusp width. From top to bottom, intercusp widths of the central incisors, canines, first premolars, second premolars, and first molars. B, Interproximal alveolar crest level (dashed arrow) between the central incisors; C, buccal and palatal bone thicknesses.

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