Treatment and posttreatment craniofacial changes after vapid maxillary expansion and facemask therapy
Treatment and posttreatment craniofacial changes after vapid maxillary expansion and facemask therapy
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DOI：
10.1067/mod.2000.109840
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发表时间：
2000-10-01
影响因子：
3
通讯作者：
McNamara, JA
中科院分区：
文献类型：
--
作者：
Baccetti, T;Franchi, L;McNamara, JA
本研究的目的是评价两组III类错（牙合）患者治疗和治疗后牙骨质的变化。受试者用粘合的丙烯酸夹板扩张器和面罩治疗，并评估该治疗方案的最佳时机。根据牙齿发育阶段将治疗样本（29名受试者）分为2组。早期治疗组包括16名混合牙列早期（萌出恒切牙和/或第一磨牙）受试者，而晚期治疗组包括13名混合牙列晚期（萌出恒尖牙和前磨牙）受试者。在3个时间段获得了脑电图：T-1，治疗前，T-2，活性治疗结束，T-3，治疗后。两个治疗组的平均T-1-T-2间期（活性治疗期）和平均T-2-T-3间期（治疗后期）均约为1年。在治疗后阶段（T-2-T-3），所有患者均未佩戴任何骨骼固位矫正器。在两个观察间隔，将未接受治疗的III类错牙合受试者组用作对照。只有在替牙期早期进行治疗时，才能观察到上颌骨矢状面生长的显著增加，在两个治疗组中发现了与髁状突更向上和向前生长方向相关的对下颌骨生长速率的抑制作用。在替牙后期治疗的III类患者中观察到垂直颌间关系的增加。治疗后，III类颅面生长模式重新建立在没有任何骨骼保留装置。复发倾向影响早期治疗受试者的上颌骨矢状生长和晚期治疗受试者的下颌骨矢状位置。替牙期早期III类错牙合的矫形治疗比替牙期晚期的治疗能够诱导更有利的颅面适应。
The aim of this study was to evaluate treatment and posttreatment dentoskeletal changes in 2 groups of subjects with Class III malocclusions. Subjects were treated with a bonded acrylic-splint expander and a face mask, and the optimal timing for this treatment protocol was assessed. The treated sample (29 subjects) was divided into 2 groups according to the stage of dental development. The early treatment group consisted of 16 subjects in the early mixed dentitional (erupting permanent incisors and/or first molars), whereas the late treatment group consisted of 13 subjects in the late mixed dentition (erupting permanent canines and premolars). Cephalograms were available at 3 time periods: T-1, pretreatment, T-2, end of active treatment, and T-3, posttreatment. The mean T-1-T-2 interval (active treatment period) and the mean T-2-T-3 interval (posttreatment period) were approximately 1 year each in both treatment groups. None of the patients wore any skeletal retention appliance during the posttreatment period (T-2-T-3). Groups of subjects with untreated Class III malocclusion were used as controls at both observation intervals. A significant increase in the sagittal growth of the maxilla was seen only when treatment was performed in the early mixed dentition, A restraining effect on mandibular growth rate associated with a more upward and forward direction of condylar growth was found in both treatment groups. An increase in vertical intermaxillary relationships was observed in Class III patients treated in the late mixed dentition. Posttreatment, the Class III craniofacial growth pattern was re-established in the absence of any skeletal retention appliance. Relapse tendency affects the sagittal growth of the maxilla in the early treated subjects and the sagittal position of the mandible in the late treated subjects. Orthopedic treatment of Class III malocclusion in the early mixed dentition is able to induce more favorable craniofacial adaptations than treatment in the late mixed dentition.