PDF(Pubmed)
Abstract：
Background: The risk of palatally displaced canines (PDCs) rises in patients with tooth agenesis. The orthodontic extrusion and alignment of PDCs require adequate anchorage to enable tooth movement and control the side effects. There is no paper presenting treatment in the case of severe oligodontia with simultaneous PDCs and the use of mini-implants (MIs) for their orthodontic extrusion. Case presentation: A 15-year-old patient presented with non-syndromic oligodontia and bilateral PDCs. Cone beam computed tomography revealed that both PDCs were in proximity to the upper incisors\' roots. There was no evident external root resorption of the incisors. The \"canines first\" approach was chosen. MIs were used both as direct and indirect anchorage. First, the extrusive forces of cantilevers were directed both occlusally and distally. Next, the buccal directions of forces were implemented. Finally, fixed appliances were used. PDCs were extruded, aligned, and torqued. Proper alignment and occlusion were achieved to enable further prosthodontic restorations. Conclusions: The use of MIs made it possible to avoid collateral effects, reduce the risk of complications, and treat the patient effectively. MIs provide adequate anchorage in demanding cases. The use of MIs for the extrusion of PDCs made it possible to offer this treatment option to patients with severe oligodontia. The presented protocol was effective and served to circumvent treatment limitations associated with an inadequate amount of dental anchorage and a high risk of root resorption.
摘要：
背景：牙齿发育不全患者发生腭移位犬（PDC）的风险增加。PDC的正畸挤压和对齐需要足够的锚固以使牙齿移动并控制副作用。在同时进行PDC的严重寡头症和使用微型植入物（MI）进行正畸挤压的情况下，没有纸提供治疗。病例介绍：一名15岁的患者，表现为非综合征性少牙和双侧PDCs。锥形束计算机断层扫描显示，两个PDC都靠近上切牙根。门牙没有明显的外部牙根吸收。选择了“犬类优先”方法。MIs被用作直接和间接锚固。首先,悬臂梁的挤压力同时指向两端。接下来,力的颊方向被实施。最后,使用固定电器。PDCs被挤出，对齐,并扭转。实现了正确的对齐和咬合，以实现进一步的修复。结论：MIs的使用可以避免附带影响，降低并发症的风险，有效地治疗病人。MIs在要求苛刻的情况下提供足够的锚固。使用MI挤出PDC使得有可能为患有严重寡头症的患者提供这种治疗选择。所提出的方案是有效的，并且可以避免与牙齿锚固量不足和牙根吸收的高风险相关的治疗局限性。
