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Zygomatic mini-implant for Class II correction in growing patients
M M El-Dawlatly1, A M Abou-El-Ezz, F A El-Sharaby
1Department of Orthodontics and Dentofacial Orthopedics, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt.
Summary
This study shows that using mini-implants in the zygomatic buttress effectively corrects Class II malocclusions by moving upper molars without adverse effects. This orthopedic approach reduces gingival display in patients.
Area of Science:
- Orthodontics
- Dental Implantology
- Craniofacial Surgery
Background:
- Class II malocclusions often require distalization of maxillary molars for correction.
- Traditional methods for molar distalization can lead to undesirable side effects.
- Mini-implants offer a potential solution for stable anchorage in orthodontic treatment.
Purpose of the Study:
- To evaluate the efficacy of a modified zygomatic anchorage system using mini-implants for Class II malocclusion correction.
- To assess the orthopedic effects of mini-implant-supported molar distalization.
- To determine if this technique can reduce gingival display associated with Class II correction.
Main Methods:
- A prospective study involving 10 treated and 10 control Class II growing female subjects (aged 10-12 years).
- Orthodontic mini-implants were placed in the zygomatic buttress for anchorage.
- Treatment changes were evaluated using cone beam CT scans over a 6-month follow-up period.
Main Results:
- Significant molar distalization (mean 2.92 mm) was achieved without extrusion or tipping.
- Significant upper incisor intrusion (mean 1.89 mm) occurred with no change in incisor inclination.
- Class II correction resulted in reduced gingival display and no significant change in the mandibular plane angle.
Conclusions:
- Mini-implant-supported zygomatic anchorage is an effective method for Class II malocclusion correction.
- This technique provides controlled molar distalization and incisor intrusion.
- The method offers a favorable alternative to traditional appliances, minimizing adverse effects and improving esthetics.
