Tang E L
Department of Children's Dentistry and Orthodontics, Faculty of Dentistry, University of Hong Kong.
ASDC J Dent Child. 1992 May-Jun;59(3):190-5.
A fifteen-year-old Chinese girl presented with unerupted maxillary permanent canines impacted against the roots of the central incisors, causing malalignment of the maxillary incisors. The canines were fully formed and their apices closed. The potential path of eruption of the canines contraindicated surgical exposure, followed by orthodontic traction. It was decided to transplant the impacted canines to their normal positions, and then align the maxillary anterior teeth, using a fixed orthodontic appliance. The transplantations and the orthodontic treatment were successful, and neither transplant showed signs of root resorption, periodontal pockets, mobility, or pain, three years after surgery. Root canal therapy was performed on the canines after transplantation, because their apices were closed. They were stained by the amalgam in the access cavities, but both responded well to nonvital bleaching using 30 percent H2O2.
一名15岁的中国女孩上颌恒尖牙未萌出，抵靠在中切牙根上，导致上颌切牙排列不齐。尖牙已完全形成，根尖闭合。尖牙的潜在萌出路径不适合手术暴露后进行正畸牵引。决定将阻生尖牙移植到正常位置，然后使用固定正畸矫治器排齐上颌前牙。移植和正畸治疗均获成功，术后三年，两颗移植牙均未出现牙根吸收、牙周袋、松动或疼痛迹象。移植后对尖牙进行了根管治疗，因为它们的根尖已闭合。它们在进入腔中被汞合金染色，但两者对使用30%过氧化氢的非活髓漂白反应良好。
