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目的:研究磁性附着体下颌种植覆盖义齿在各种咬合状态时下颌牙槽骨的应力分布。方法:选取标准无牙颌模型,在双侧尖牙区植入种植体,连接磁性附着体,翻制下颌环氧树脂模型,制作生物功能性全口义齿,分别在正中、前伸、侧向咬合时加载应力,冻结切片,观测各牙位应力条纹。结果:磁性附着体下颌种植覆盖义齿在正中、侧向、前伸咬合应力加载时种植体周围牙槽骨应力值最大,余留牙槽嵴后牙区所受应力大于前牙区。正中、前伸磨牙区最大应力值出现于颊侧,切牙区最大应力值出现于舌侧。侧向工作侧最大应力值出现于唇颊侧,平衡侧最大应力值出现于舌侧。结论:磁性附着体种植覆盖义齿各向咬合时,应力既分布到种植体,也分布到剩余牙槽嵴,可以明显降低种植体周围骨组织的受力,有利于种植体的健康。
OBJECTIVE: To study the stress distribution of mandibular alveolar bone in mandibular implant overdenture with various attachments. Methods: The standard edentulous jaw model was selected, implants were implanted in the canine fangs, the magnetic attachment was attached, the mandibular epoxy resin model was made and the biologically functional complete denture was made. Bite when loaded stress, frozen sections, observe the stress streaks of each tooth. Results: The stress of the alveolar bone around the implant was the highest when mandibular implant overdenture was loaded in the middle, lateral, and extensor bite, and the stress in the posterior alveolus of the remaining alveolar ridge was greater than that in the anterior teeth. The median stress in maxillary and anterior extensor molar was found on the buccal side, and the maximum stress in the incisors appeared on the lingual side. Lateral working side of the maximum stress value appears in the buccal side of the balance side of the maximum stress value appears in the lingual side. CONCLUSIONS: When the magnetic attachment is orthodontic, the stress distributes not only to the implant but also to the remaining alveolar ridge, which can significantly reduce the stress on the bone tissue around the implant and is beneficial to the health of the implant.