En-masse retraction with a preformed nickel-titanium and stainless steel archwire assembly and temporary skeletal anchorage devices without posterior bonding
지정현, 안효원, 서경원, 김성훈, 국윤아, 정규림, Nelson Gerald,
소속 상세정보
지정현 ( Jee Jeong-Hyun ) - Catholic University Postgraduate School of Dentistry Department of Orthodontics
안효원 ( Ahn Hyo-Won ) - Kyung Hee University School of Dentistry Department of Orthodontics
서경원 ( Seo Kyung-Won ) - Kyung Hee University School of Dentistry Department of Orthodontics
김성훈 ( Kim Seong-Hun ) - Kyung Hee University School of Dentistry Department of Orthodontics
국윤아 ( Kook Yoon-Ah ) - Catholic University Postgraduate School of Dentistry Department of Orthodontics
정규림 ( Chung Kyu-Rhim ) - Ajou University School of Medicine Department of Orthodontics
( Nelson Gerald ) - University of California Department of Orofacial Science Division of Orthodontics
KMID : 0361920140440050236
Abstract
Objective: To evaluate the therapeutic effects of a preformed assembly of nickel-titanium (NiTi) and stainless steel (SS) archwires (preformed C-wire) combined with temporary skeletal anchorage devices (TSADs) as the sole source of anchorage and to compare these effects with those of a SS version of C-wire (conventional C-wire) for en-masse retraction.
Methods: Thirty-one adult female patients with skeletal Class I or II dentoalveolar protrusion, mild-to-moderate anterior crowding (3.0?6.0 mm), and stable Class I posterior occlusion were divided into conventional (n = 15) and preformed (n = 16) C-wire groups. All subjects underwent first premolar extractions and en-masse retraction with pre-adjusted edgewise anterior brackets, the assigned C-wire, and maxillary C-tubes or C-implants; bonded mesh-tube appliances were used in the mandibular dentition. Differences in pretreatment and post-retraction measurements of skeletal, dental, and soft-tissue cephalometric variables were statistically analyzed.
Results: Both groups showed full retraction of the maxillary anterior teeth by controlled tipping and space closure without altered posterior occlusion. However, the preformed C-wire group had a shorter retraction period (by 3.2 months). Furthermore, the maxillary molars in this group showed no significant mesialization, mesial tipping, or extrusion; some mesialization and mesial tipping occurred in the conventional C-wire group.
Conclusions: Preformed C-wires combined with maxillary TSADs enable simultaneous leveling and space closure from the beginning of the treatment without maxillary posterior bonding. This allows for faster treatment of dentoalveolar protrusion without unwanted side effects, when compared with conventional C-wire, evidencing its clinical expediency.
키워드
Anchorage; Orthodontic mini-implant; Tooth movement; Orthodontic treatment
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