Absolute Anchorage in the Correction of Class II Skeletal Malocclusion with an Infra-Zygomatic Crest Bone Screw Approach

Introduction: This case study explains the treatment with prognathic maxilla and retrognathic mandible of Class II skeletal malocclusion with strongly proclined maxillary incisors and lingually blocked right lateral mandibular incisors with complete distalization of the maxillary arch and the use of infrazygomatic crest bone screws devoid of premolar extraction. Treatment of patients with Class II skeletal discrepancy presents orthodontists with a task. With the introduction of Temporary Anchorage Devices (TADs) used as skeletal anchorage techniques, however, this has become a thing of the past: treatment involved a pre-adjusted edgewise appliance strap-up, MBT (0.022 X 0.028-inch slot) procedure. While premolar extractions were warranted in the case, a non-extraction method was suggested. For the distalization of the entire maxillary arch, infra-zygomatic bone screws of 14 mm in length and 2 mm in diameter were used. This case was reviewed at the beginning of orthodontic treatment (T1) and at the end of orthodontic treatment (T1). (T2) treatment. Results: At T2, with the canines and molars finished in Class I relationship, extreme pre-maxillary prognathism and mandibular anterior crowding with lingually locked right lateral incisor were corrected. There was a satisfactory achievement of regular overbite and overjet with a pleasing soft tissue profile. Conclusion: To correct Class II skeletal disparity with maxillary prognathism and extreme proclination of maxillary incisors devoid of premolar extractions, infra-zygomatic bone screws can be used efficiently as absolute skeletal anchorage.

Author (s) Details

Dr. A. Arif Yezdani,
Department of Orthodontics and Dentofacial Orthopedics, Sree Balaji Dental College and Hospital, Bharath Institute of Higher Education and Research, Chennai, Tamil Nadu, India.

Dr. Priya Chatterjee
Department of Orthodontics and Dentofacial Orthopedics, Sree Balaji Dental College and Hospital, Bharath Institute of Higher Education and Research, Chennai, Tamil Nadu, India.

Prof. Dr. S. Kishore Kumar
Department of Orthodontics and Dentofacial Orthopedics, Sree Balaji Dental College and Hospital, Bharath Institute of Higher Education and Research, Chennai, Tamil Nadu, India.

Dr. Kesavaram Padmavathy
Department of Microbiology, Research Laboratory for Oral-Systemic Health, Sree Balaji Dental College and Hospital, Bharath Institute of Higher Education and Research, Chennai, Tamil Nadu, India.

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