Andreasen J O, Paulsen H U, Yu Z, Bayer T, Schwartz O
Department of Oral Surgery and Oral Medicine, University Hospital, (Rigshospitalet), Copenhagen, Denmark.
Eur J Orthod. 1990 Feb;12(1):14-24. doi: 10.1093/ejo/12.1.14.
The purpose of the present investigation was to determine the long-term prognosis of autotransplanted premolars with respect to tooth survival and pulpal healing. The material consisted of 195 patients aged 7 to 35 years, with a total of 370 autotransplanted premolars with observation period ranged from 1 to 13 years. Teeth transplanted with incomplete and complete root formation showed 95 per cent and 98 per cent long-term survival respectively: Pulp healing as evaluated by sensibility testing and radiographic signs of partial pulp canal obliteration was usually verified 6 months after transplantation. The frequency of pulpal healing (versus pulp necrosis), appeared to be closely related to stage of root development at time of transplantation. Teeth transplanted with incomplete and complete root formation showed 96 per cent and 15 per cent pulp healing respectively. Another and associated factor which could equally well predict pulpal healing was the diameter of the apical foramen of the graft. Finally, in teeth with completed root formation, the use of bursa with internal cooling and no extra-alveolar storage prior to transplantation seemed to increase the chance for pulpal healing. The present study indicates, that the size of the apical foramen and possibly the avoidance of bacterial contamination during the surgical procedure are explanatory factors for pulpal healing.
本研究的目的是确定自体移植前磨牙在牙齿存活和牙髓愈合方面的长期预后。研究材料包括195名年龄在7至35岁之间的患者，共有370颗自体移植前磨牙，观察期为1至13年。牙根形成不完全和完全的移植牙齿的长期存活率分别为95%和98%：通过感觉测试和部分牙髓腔闭塞的影像学征象评估的牙髓愈合通常在移植后6个月得到证实。牙髓愈合（相对于牙髓坏死）的频率似乎与移植时牙根发育阶段密切相关。牙根形成不完全和完全的移植牙齿的牙髓愈合率分别为96%和15%。另一个同样可以很好地预测牙髓愈合的相关因素是移植牙的根尖孔直径。最后，对于牙根已完全形成的牙齿，在移植前使用带内部冷却的囊袋且不进行牙槽外储存似乎会增加牙髓愈合的机会。本研究表明，根尖孔的大小以及手术过程中可能避免细菌污染是牙髓愈合的解释因素。
