Comparison of the zygoma anchorage system with cervical headgear in buccal segment distalization

Abstract

This prospective study aimed to evaluate the effects of the zygoma anchorage system (ZAS) in buccal segment distalization in comparison with cervical headgear (CH). Thirty patients with Class II dental malocclusions were included in the study and were divided into two equal groups: the first group (10 females and 5 males, mean age 14.74 years at T1) received buccal segment distalization with ZAS and the second group (8 females and 7 males, mean age 15.26 years at T1) with CH. The skeletal, dental, and soft tissue changes were measured on cephalograms obtained before (T1) and after (T2) distalization, and these changes were statistically evaluated using a repeated measures analysis of variance, Mann-Whitney U-test, and Wilcoxon test. The Class II buccal segment relationship was corrected to a Class I in an average period of 9.03 +/- 0.62 months in the ZAS group and 9.00 +/- 0.76 months in the CH group. Significant distalization was observed for the posterior teeth in both groups (P < 0.001). Distal tipping of all posterior teeth occurred in the CH group (P < 0.001), but only for the molars in the ZAS group (P < 0.001). The upper incisors retroclined, overjet decreased, and the upper and lower lips retruded in both groups. The ZAS provided absolute anchorage for distalization of the maxillary posterior teeth and can be used as an aesthetic and non-compliant alternative to extraoral traction in the treatment of Class II malocclusions.

Zygoma-Gear Apareyi ile Maksiller Molar Distalizasyonunun Maksiller Üçüncü Molar Dişler Üzerine Etkileri

“…By using the ZGA system, the molars are never required for the anchorage during the retraction of the premolars and anterior teeth. In addition, maxillary central incisors were retruded (-1.4±1.2) and overjet was decreased (-0.4±0.3) after distalization, showing that there was no anchorage loss by using the ZGA (10,12,20,21 (22). ZGA sistemi kullanıldığı zaman premolar ve anterior dişlerin retraksiyonu sırasında ankraj için molarlara ihtiyaç duyulmamaktadır.…”

“…Relapse of molar distalization was commonly seen as the molars are usually used as anchorage during distalization and retraction of the premolars and incisors and thus it has been recommended that the maxillary molars should not be used for distalization and retraction of the premolar teeth (22). By using the ZGA system, the molars are never required for the anchorage during the retraction of the premolars and anterior teeth.…”

Zygoma-gear appliance for intraoral upper molar distalization

“…The zygomatic process of the maxilla can be used for this purpose because zygomatic anchors can be positioned at the zygomatic buttress, at a safe distance from the roots of the maxillary molars and allow a full unit buccal segment distalization. 20,21 Sugawara et al 20 and Kaya et al 21 described their distalization systems supported with the zygomatic anchor plates. They reported that the en-masse distalization of maxillary buccal segments was successfully accomplished by their systems.…”

“…19 Recently, zygomatic anchorage systems have been used alternatively for upper molar distalization. 20,21 We designed an intraoral upper molar distalization system supported by the zygomatic region named as the Zygoma-Gear Appliance (ZGA). The aim of this study is to present the use of ZGA for bilateral upper molar distalization in a 16-year-old female with a Class II molar relationship requiring molar distalization.…”

Minivida İmplant Destekli Distalizasyon Sisteminin Dentoalveoler Etkileri

“…Ortodontik ve ortopedik amaçlarla kullanılan iskeletsel ankraj sistemleri üzerine bir çok klinik ve deneysel çalışma yapılmıştır. Bu çalışmalar; dental implantlar (11)(12)(13)(14), onplantlar (15), zigomatik teller (16), Graz implantlar (17), biyolojik olarak parçalanan implantlar (18), modüler geçici implantlar (19), mini/mikro vidalar (20-21) ve miniplaklar (22)(23) kullanan yöntemleri içerir.…”