Selvig K A, Bjorvatn K, Claffey N
School of Dentistry, University of Bergen, Norway.
Acta Odontol Scand. 1990 Apr;48(2):107-12. doi: 10.3109/00016359009005865.
Mandibular incisors were extracted and allowed to dry in air for 45 min. They were then root-planed extensively, leaving a cervical collar and the apical region uninstrumented, to prevent direct contact between root surface and alveolar bone after replantation while, at the same time, enabling precise and stable reseating of the tooth. Control teeth were replanted either without further treatment or after treatment with citric acid for 3 min. Experimental teeth were treated before replantation with 1% SnF2 for 5 min, 1% tetracycline HCl for 5 min, or 1% SnF2 followed by 1% tetracycline. Histometric analysis of healing in the root-planed areas showed minimal amounts of inflammatory resorption and ankylosis after 21 days in experimental teeth as compared with the control teeth. A persisting inflammatory reaction in the periodontal ligament without root resorption was, however, frequently seen. The observations confirm that the frequency of adverse healing reactions after delayed replantation of teeth from which nonvital soft tissue remnants have been removed can be reduced by demineralizing the root surface and preventing mechanical trauma to the root surface in the postoperative period. Root surface treatment with SnF2 followed by tetracycline resulted in complete absence of inflammatory resorption and ankylosis in this short-term experiment.
拔除下颌切牙，让其在空气中干燥45分钟。然后对其进行广泛的根面平整，保留颈部牙环和根尖区域不进行器械处理，以防止再植后牙根表面与牙槽骨直接接触，同时能够使牙齿精确且稳定地复位。对照牙要么不做进一步处理直接再植，要么用柠檬酸处理3分钟后再植。实验牙在再植前分别用1%氟化亚锡处理5分钟、1%盐酸四环素处理5分钟，或者先用1%氟化亚锡处理，接着再用1%四环素处理。对根面平整区域愈合情况的组织计量学分析显示，与对照牙相比，实验牙在21天后炎症性吸收和牙骨质粘连的量极少。然而，在牙周膜中经常可以看到持续存在的炎症反应但无牙根吸收。这些观察结果证实，对于已去除无活力软组织残端的牙齿，延迟再植后不良愈合反应的发生率可通过使牙根表面脱矿并在术后防止牙根表面受到机械损伤而降低。在这个短期实验中，先用氟化亚锡然后用四环素处理牙根表面，结果完全没有出现炎症性吸收和牙骨质粘连。
