Publication: Changes of the transverse dental arch dimension, overjet and overbite after rapid maxillary expansion (RME)
Accepted Date
2014-09-01
Issued Date
2014-09
Resource Type
Language
eng
ISSN
0125-5614 (printed)
Rights
Mahidol University
Rights Holder(s)
Faculty of Dentistry Mahidol University
Bibliographic Citation
Thiradlok S. Changes of the transverse dental arch dimension, overjet and overbite after rapid maxillary expansion (RME). M Dent J. 2014; 34(3): 301-10.
Suggested Citation
Sasipa Thiradilok, ศศิภา ธีรดิลก Changes of the transverse dental arch dimension, overjet and overbite after rapid maxillary expansion (RME). Thiradlok S. Changes of the transverse dental arch dimension, overjet and overbite after rapid maxillary expansion (RME). M Dent J. 2014; 34(3): 301-10.. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/1119
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Title
Changes of the transverse dental arch dimension, overjet and overbite after rapid maxillary expansion (RME)
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Abstract
Objective: The aim of this study was to evaluate changes of the transverse
dental arch dimension, overjet and overbite after the patients underwent the
rapid maxillary expansion.
Materials and methods: The upper and lower dental models of the patients
who showed maxillary constriction with posterior crossbite and underwent
maxillary expansion were collected. The transverse dental arch dimensions at
canine, first premolar, second premolar and first molar were measured before
(T1) and after the expansion (T2). The overjet and overbite of both before and
after expansion (T1,T2) were also recorded. Moreover, the dental models of
patients with no posterior crossbite were collected as control. Paired t-test
was performed to evaluate the changes of the dental arch dimensions after
the expansion. The student t-test of the independent samples, treated and
untreated groups, were selected for the statistical analysis.
Results: The maxillary interdental arch widths of canines, premolars and
molars significantly increased after the expansion when compared to these
before treatment. The amount of the expansion were 3.52±2.25 mm, 4.55±
2.34 mm, 5.18±1.80 mm, and 5.03±2.04 mm for intercanine, inter-first
premolar, inter-second premolar and intermolar widths, respectively. The
changes on the lower arch were evaluated, although only the upper arch was
expanded. The statistical significant increase in the mandibular interdental
arch widths except the intercanine width, was found. The overjet and overbite
decreased which showed the clinical changes after the maxillary expansion in
the sagittal dental arch dimension. The upper and lower interdental arch
widths of the maxillary constricted patients after maxillary expansion, were
enlarged to be similar to the patients with no posterior crossbite.
Conclusion: The efficiency of the expansion therapy is to correct the
constricted maxilla and enlarge both maxilla and mandibular transverse
dental arch dimensions. After maxillary expansion, the posterior crossbite and
the excessive overjet improved.