The stability of the arch-expansion effects of Fränkel appliance therapy

David L. Hime, Albert H. Owen

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


To assess the long-term stability of the arch expansion effects of the functional regulator, mandibular dental casts were evaluated for treatment and postretention changes in intercanine width, width between first premolars, width between second premolars, intermolar width, incisor irregularity, and arch length. This study was comprised of 11 cases that were treated with the Fränkel appliance (-x = 27 mo.) and were and average of 4 years and 4 months out of active treatment. Results showed overall stability to be good, with some variability present in individual responses. Intercanine width, width of first premolars, width of second premolars, and intermolar width all demonstrated maintenance of treatment increases. Correction of incisor irregularity displayed better stability than has been reported in other stability studies. Arch length decreased with treatment and continued to decrease during the postretention period, although to a lesser extent than has been previously reported. The results of this study support the statements of Fränkel concerning the stability of this type of arch expansion.

Original languageEnglish (US)
Pages (from-to)437-445
Number of pages9
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Issue number5
StatePublished - Nov 1990

ASJC Scopus subject areas

  • Orthodontics


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