种植体支抗近中正畸加载对根骨的影响。
Root and bone response to the proximity of a mini-implant under orthodontic loading.
机构信息
Department of Orthodontics, Seoul National University, Korea.
出版信息
Angle Orthod. 2010 May;80(3):452-8. doi: 10.2319/070209-369.1.
OBJECTIVE
To determine the histological reaction of the root and bone as a mini-implant approaches the root.
MATERIALS AND METHODS
Two kinds of mini-implants were inserted into the buccal alveolar bone of 4 beagles (2 males and 2 females). The specimens were classified as the near-root group, the PDL contact group, the root contact group, and the root perforation group. Cementum resorption, dentin resorption, cementum repair, cementum growth, ankylosis, root cracking, and root fracture were assessed as the implant neared the root.
RESULTS
The incidence of root resorption increased when the mini-implant was less than 0.6 mm from the root in the near-root group and PDL contact group. Root cracking and root fracture occurred in the root contact group and root perforation group. Bone resorption and ankylosis were observed in some specimens. However, some specimens of the PDL contact group and root contact group had cementum growth or little root resorption despite proximity to the root. In the root perforation group, root resorption and ankylosis occurred on the side opposite the insertion.
CONCLUSIONS
There is a risk of root contact and severe tissue damage from a thick mini-implant and the drilling procedure, either of which can induce root resorption or ankylosis. Use of smaller mini-implants may reduce root contact and tissue damage. However, the small mini-implant may need enhancement of its stability.
目的
确定迷你种植体接近根部时根部和骨骼的组织学反应。
材料和方法
将两种迷你种植体分别植入 4 只比格犬（2 雄 2 雌）的颊侧牙槽骨中。将标本分为根近侧组、牙周膜接触组、根接触组和根穿孔组。当迷你种植体距离根部小于 0.6mm 时，评估牙骨质吸收、牙本质吸收、牙骨质修复、牙骨质生长、骨粘连、根裂和根折等作为种植体接近根部的情况。
结果
在根近侧组和牙周膜接触组中，当迷你种植体距离根部小于 0.6mm 时，根吸收的发生率增加。在根接触组和根穿孔组中发生根裂和根折。在一些标本中观察到骨吸收和骨粘连。然而，在牙周膜接触组和根接触组的一些标本中，尽管靠近根部，但仍有牙骨质生长或少量根吸收。在根穿孔组中，插入侧的对侧发生根吸收和骨粘连。
结论
厚的迷你种植体和钻孔过程都有与根部接触和严重组织损伤的风险，这两者都可能导致根吸收或骨粘连。使用较小的迷你种植体可能会减少根接触和组织损伤。然而，小的迷你种植体可能需要增强其稳定性。
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