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KMID : 0361920190490020089
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Korean Journal of Orthodontics
2019 Volume.49 No. 2 p.89 ~ p.96
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Long-term stability of maxillary and mandibular arch dimensions when using rapid palatal expansion and edgewise mechanotherapy in growing patients
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Kim Ki-Beom
Doyle Renee E.
Araujoa Eustaquio A.
Behrentsa Rolf G.
Oliver Donald R.
Thiesen Guilherme
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Abstract
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Objective: The purpose of this study was to assess the long-term stability of rapid palatal expansion (RPE) followed by full fixed edgewise appliances.
Methods: This study included 67 patients treated using Haas-type RPE and non-extraction edgewise appliance therapy at a single orthodontic practice. Serial dental casts were obtained at three different time points: pretreatment (T1), after expansion and fixed appliance therapy (T2), and at long-term recall (T3). The mean duration of the T1?T2 and T2?T3 periods was 4.8 ± 3.5 years and 11.0 ± 5.4 years, respectively. The dental casts were digitized, and the computed measurements were compared with untreated reference data.
Results: The majority of treatment-related increases in the maxillary and mandibular arch measurements were statistically significant (p < 0.05) and greater than expected for the untreated controls. Although many measurements decreased postretention (T2?T3), the net gains persisted for all of the measurements evaluated.
Conclusions: The use of RPE therapy followed by full fixed edgewise appliances is an effective method for increasing maxillary and mandibular arch width dimensions in growing patients.
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KEYWORD
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Expansion, Stability, Digital models
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