Skeletal Anchorage for Orthopedic Correction of Growing Class III Patients: Results from 30 Cases

  • Prof Bong-Kuen Cha, Department of Orthodontics, College of Dentistry, Kangnung-Wonju National University, Gangneung, South Korea, Korea
  • Dr Dong-Soon Choi, Department of Orthodontics, College of Dentistry, Kangnung-Wonju National University, Gangneung, South Korea, Korea

Maxillary protraction headgear has been used in the treatment of Class III malocclusion with maxillary deficiency. However, loss of dental anchorage has been reported with the use of tooth-borne anchorage such as lingual arches and expansion devices. Such a side effect can be eliminated or minimized using skeletal anchorage device such as implants, onplants, or intentional ankylosis of primary teeth. Although above treatment modalities are reasonable, the indications of these methods have many clinical limitations and some are impractical and costly. Skeletal anchorage (e.g. microscrews or miniplates) are gaining popularity as a source of absolute anchorage in contemporary orthodontics. But until now few reports about its orthopedic application for the protraction of maxilla in growing class lll patient have been published. Our clinical experience showed that the amount of skeletal effect with this system is much larger than that of the conventional RME and protraction headgear combination. The difference in amount of change in terms of SNO (angle between anterior cranial base and orbitale) and palatal plane angle is also interesting. The aim of this presentation is to illustrate the clinical use of surgical miniplates as an anchorage unit in the protraction headgear treatment. With the introduction of the clinical procedure, short term cephalometric change and the results of the three-dimensional FEM (finite element model) experiment will be also presented, compared with conventional RME protraction headgear combination.