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本文主要是研究用正畸方法关闭成人下颌第一磨牙缺牙间隙时所发生的牙及牙周组织的变化。材料和方法 14名正畸患者,年龄为20岁～39岁,共19个下颌第一磨牙缺牙间隙。X线照片显示牙槽愈合良好。所有患者均戴用cdgewise矫正器关闭缺牙间隙,治疗时间为23～52月。用治疗前、后的研究模测量无牙间隙的近远中长度和牙槽嵴的颊舌向宽度;用X线头影测量分析第二磨牙和前磨牙冠和根移动的量;用治疗前、后的全颌曲面断层片或根尖片测量第二磨牙和邻近牙周组织的解剖变化。
This paper mainly studies the changes of the teeth and periodontal tissues that occur when the adult mandibular first molar is closed with orthodontics. MATERIALS AND METHODS: Fourteen orthodontic patients, aged from 20 to 39 years old, had 19 mandibular first molar missing teeth. X-ray showed good healing of the alveoli. All patients were wearing a cdgewise appliance to close the missing tooth gap, the treatment time was 23 to 52 months. Before and after treatment, the model was used to measure the length and width of the toothless gap and the width of the buccal and lingual crest of the alveolar ridge. The amount of crown and root movement of the second molars and premolar teeth was measured by X-ray cephalometry. Before treatment, After the total jaw curved surface or periapical patch measuring the second molar and adjacent periodontal tissue anatomical changes.