Effects of facemask treatment anchored with miniplates after alternate rapid maxillary expansions and constrictions; a pilot study

Angle Orthod. 2011 Jul;81(4):639-46. doi: 10.2319/081010-473.1. Epub 2011 Feb 7.


Objective: To describe the dentoskeletal and soft tissue effects of facemask treatment anchored with miniplates after alternate rapid maxillary expansions and constrictions (Alt-RAMEC) in maxillary retrusion patients.

Materials and methods: The sample consisted of 15 patients with a mean skeletal age of 11.6 ± 1.59 years undergoing 8 weeks of Alt-RAMEC followed by maxillary protraction. Three hundred fifty to 400 g of force per side was applied to the facemask from the titanium miniplates inserted on the lateral nasal wall of the maxilla. Total treatment time was 9.9 ± 2.63 months. Treatment changes were evaluated cephalometrically and analyzed by means of the dependent t-test and the Wilcoxon signed rank test.

Results: The miniplates withstood the orthopedic forces exerted during the treatment. Cephalometric findings showed that the maxilla moved forward by 2 mm, with an 0.8° counterclockwise rotation and without maxillary incisor movement. The mandible moved slightly in a downward and backward direction (1.2°). The inclinations of the mandibular incisors decreased significantly (2°). Statistically significant increases were observed in the vertical dimension (1°-1.3°). Soft tissue changes were more marked in the upper lip and soft tissue pogonion than in the lower lip.

Conclusions: This treatment approach can offer an advantage for correcting mild/moderate maxillary retrusion in Class III patients.

MeSH terms

  • Bone Plates
  • Cephalometry
  • Child
  • Extraoral Traction Appliances*
  • Female
  • Humans
  • Male
  • Malocclusion, Angle Class III / surgery
  • Malocclusion, Angle Class III / therapy*
  • Maxilla / surgery
  • Orthodontic Anchorage Procedures / instrumentation*
  • Orthognathic Surgical Procedures
  • Palatal Expansion Technique*
  • Pilot Projects
  • Prospective Studies
  • Retrognathia / surgery
  • Retrognathia / therapy*
  • Statistics, Nonparametric
  • Vertical Dimension