Displacement and stress distribution of the maxillofacial complex during maxillary protraction using palatal plates: A three-dimensional finite element analysis
엄주석, Bayome Mohamed, 박재현, 임희진, 국윤아, 한성호,
소속 상세정보
엄주석 ( Eom Ju-Suk ) - Private practice
( Bayome Mohamed ) - Catholic University College of Medicine Department of Dentistry
박재현 ( Park Jae-Hyun ) - A.T. Still University Arizona School of Dentistry & Oral Health Postgraduate Orthodontic Program
임희진 ( Lim Hee-Jin ) - Catholic University College of Medicine Seoul St. Mary’s Hospital Department of Orthodontics
국윤아 ( Kook Yoon-Ah ) - Catholic University College of Medicine Seoul St. Mary’s Hospital Department of Orthodontics
한성호 ( Han Seong-Ho ) - Catholic University St. Vincent’s Hospital Department of Dentistry
Abstract
Objective: The purpose of this study was to analyze initial displacement and stress distribution of the maxillofacial complex during dentoskeletal maxillary protraction with various appliance designs placed on the palatal region by using three-dimensional finite element analysis.
Methods: Six models of maxillary protraction were developed: conventional facemask (Type A), facemask with dentoskeletal hybrid anchorage (Type B), facemask with a palatal plate (Type C), intraoral traction using a Class III palatal plate (Type D), facemask with a palatal plate combined with rapid maxillary expansion (RME; Type E), and Class III palatal plate intraoral traction with RME (Type F). In Types A, B, C, and D, maxillary protraction alone was performed, whereas in Types E and F, transverse expansion was performed simultaneously with maxillary protraction.
Results: Type C displayed the greatest amount of anterior dentoskeletal displacement in the sagittal plane. Types A and B resulted in similar amounts of anterior displacement of all the maxillofacial landmarks. Type D showed little movement, but Type E with expansion and the palatal plate displayed a larger range of movement of the maxillofacial landmarks in all directions.
Conclusions: The palatal plate served as an effective skeletal anchor for use with the facemask in maxillary protraction. In contrast, the intraoral use of Class III palatal plates showed minimal skeletal and dental effects in maxillary protraction. In addition, palatal expansion with the protraction force showed minimal effect on the forward movement of the maxillary complex.
키워드
Finite element model; Facemask; Expansion; Palatal plate
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