Korean J Orthod.  2010 Jun;40(3):195-206. 10.4041/kjod.2010.40.3.195.

Zygoma-gear appliance for intraoral upper molar distalization

• Nur M
• Bayram M
• Pampu A

• KMID: 1459573
• DOI: http://doi.org/10.4041/kjod.2010.40.3.195

Abstract

The aim of this report is to present an intraoral upper molar distalization system supported with zygomatic anchorage plates (Zygoma-gear Appliance, ZGA). This system was used for a 16-year-old female patient with a Class II molar relationship requiring molar distalization. The system consisted of bilateral zygomatic anchorage plates, an inner-bow and heavy intraoral elastics. Distalization of the upper molars was achieved in 3 months and the treatment results were evaluated from lateral cephalometric radiographs. According to the results of the cephalometric analysis, the maxillary first molars showed a distalization of 4 mm, associated with a distal axial inclination of 4.5degrees. The results of this study show that an effective upper molar distalization without anchorage loss can be achieved in a short time using the ZGA. We suggest that this new system may be used in cases requiring molar distalization in place of extraoral appliances.

Keyword

Distalization; Zygomatic anchorage plate; Class II; Anchorage

MeSH Terms

Adolescent
Female
Humans
Hypogonadism
Mitochondrial Diseases
Molar
Ophthalmoplegia
Hypogonadism
Mitochondrial Diseases
Ophthalmoplegia

Figure

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  Fig 1. Schematic illustration of components (A) and the effective distalizing force vector of the ZGA (Zygoma-Gear Appliance) (B).

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  Fig 2. The zygomatic anchor plates adapted and fixed to the zygomatic buttress.

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  Fig 3. Pretreatment facial and intraoral photographs of the case.

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  Fig 4. Pretreatment diagnostic models of the case.

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  Fig 5. Pretreatment radiographic records of the case.

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  Fig 6. Intraoral occlusal views of the mechanics for erupting of the impacted canines (A), and of the erupted canines (B).

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  Fig 7. Application of the ZGA (Zygoma-Gear Appliance) at the beginning of distalization (A), and the views of the patient immediately after the distalization (B).

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  Fig 8. Lateral cephalometric radiograph of the case taken immediately after the distalization.

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  Fig 9. The system for retraction of the incisors.

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  Fig 10. Posttreatment facial and intraoral photographs of the case.

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  Fig 11. Posttreatment dental casts of the case.

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  Fig 12. Posttreatment radiographic records of the case.

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  Fig 13. Intraoral photographs of the case after restoring the peg shaped upper lateral incisors.

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  Fig 14. Superimpositions of pre- and post-distalization (A), and pre- and post-treatment cephalometric tracings (B).

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