Center for Graduate Studies in Prosthodontics, Department of Prosthodontics, School of Dental Medicine, Hebrew University-Hadassah, Jerusalem, Israel.
Int J Prosthodont. 2009 Sep-Oct;22(5):441-6.
The need to place a restoration's margins on sound tooth material may require crown lengthening or forced eruption. The latter intervention may benefit from a severance of the tooth's circumferential fibers during the orthodontic process in an effort to stabilize the bone level. Orthodontic appliance design for the extrusive action, especially in the absence of neighboring teeth, may require the use of mini-implants, which are a useful adjunct in such situations.
This case history describes the management of a maxillary left canine that lacked sound tooth material in the cervical zone for a proper ferrule. It was diagnosed as requiring extrusion so as to recruit it into an abutment role for a fixed partial denture design. This treatment modality was considered more favorable compared to the alternative of a crown lengthening procedure. The tooth in question was a strategic abutment in an old and failing porcelain-fused-to-metal fixed prosthesis.
Fiberotomy permitted rapid extrusion of the canine and available sound tooth margins for crown preparation with a proper ferrule.
Following 28 days of tooth stabilization the implants were easily removed and treatment continued as originally planned.
为了在健康的牙体组织上放置修复体边缘，可能需要进行牙冠延长术或正畸助萌。后者干预措施可能受益于在正畸过程中切断牙齿的周向纤维，以稳定骨水平。为了实现突出的正畸效果（尤其是在没有邻牙的情况下），正畸器械的设计可能需要使用微型种植体，在这种情况下，微型种植体是一种有用的辅助手段。
本病例报告描述了对左上尖牙的处理，该尖牙在颈区缺乏健康的牙体组织，无法获得适当的冠边缘。诊断为需要进行正畸助萌，以便将其纳入固定局部义齿设计的基牙。与牙冠延长术相比，这种治疗方式被认为更具优势。有问题的牙齿是一个老旧且失败的烤瓷熔附金属固定修复体的战略基牙。
纤维切断术允许快速正畸助萌尖牙，并获得足够的健康牙体边缘进行牙冠预备和适当的冠边缘。
在牙齿稳定 28 天后，很容易取出种植体，然后按原计划继续治疗。
