Prediction of treatment outcome following correction of anterior crossbites in the mixed dentition: orthodontic versus orthopaedic methods.

To separate subjects with anterior crossbite and mild maxillary deficiency into two groups: those that can be treated successfully with a 2 x 4 appliance and those that should be treated with reverse headgear and maxillary expansion.
Thirty mixed dentition subjects each with an anterior crossbite, a concave profile, a deficient maxilla, and an ANB angle between -2 and +1 degrees were used. Fifteen subjects (8 boys, 7 girls; Mean age: 9.17 +/- 1.1 years) were successfully treated with a 2 x 4 appliance (orthodontic treatment group) and remainder (5 boys, 10 girls; Mean age: 8.6 +/- 1.5 years) were successfully treated with reverse headgear and maxillary expansion after initial treatment with a 2 x 4 appliance had failed (orthopaedic treatment group). Unstandardised discriminant function coefficients and a constant were calculated for selected pretreatment cephalometric variables.
The NSAr angle was significantly smaller (p < 0.01) and both anterior and posterior cranial base lengths were significantly longer in the orthodontic treatment group (p < 0.001) compared with the orthopaedic group. The prediction index developed was: (PI) = -0.2 NSAr + 0.243 S-N + 0.187 S-Ar + 3.366. The critical score was 0. With positive scores a 2 x 4 appliance can be used and with negative scores reverse headgear and expansion are indicated.
An equation able to predict treatment success with either a 2 x 4 appliance or reverse headgear has been developed.
AuthorsYan Gu
JournalAustralian orthodontic journal (Aust Orthod J) Vol. 21 Issue 1 Pg. 25-30 (May 2005) ISSN: 0587-3908 [Print] Australia
PMID16433078 (Publication Type: Comparative Study, Journal Article)
  • Algorithms
  • Cephalometry
  • Child
  • Dentition, Mixed
  • Extraoral Traction Appliances
  • Female
  • Follow-Up Studies
  • Forecasting
  • Humans
  • Incisor (pathology)
  • Male
  • Malocclusion (pathology, therapy)
  • Maxilla (pathology)
  • Orthodontic Brackets
  • Orthodontic Wires
  • Orthodontics, Corrective (methods)
  • Palatal Expansion Technique
  • Skull Base (pathology)
  • Treatment Outcome

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