Bauss Oskar, Zonios Ioannis, Rahman Alexander
Department of Orthodontics, University Dental School of Geneva, Geneva, Switzerland.
J Oral Maxillofac Surg. 2008 Jun;66(6):1200-11. doi: 10.1016/j.joms.2007.12.035.
The aim of this study was to compare root development after transplantation of teeth into surgically created sockets or into fresh extraction sites.
The sample consisted of 62 patients with a total of 64 transplanted immature third molars. All transplants were at root development stages 3 to 4. In 22 cases, a new socket was created by means of burs. Forty-two teeth transplanted into a fresh extraction site served as controls. Postoperative root development was determined on intraoral radiographs taken immediately after transplantation and at the final follow-up. For all transplants, extraoral storage time and number of trials were recorded during transplantation.
No significant intergroup differences were observed at root development stage 3. In contrast, at root development stage 4 transplantations to surgically created sockets showed a significantly lower final root length (P = .025) and root length increment (P = .038) than transplants in the control group. In addition, a significant correlation was determined in the prepared socket group at developmental stage 4 between root length increment and extraoral storage time (r = -0.910, r(2) = 0.828, P < .001) or number of trials in the recipient socket (r = -0.775, r(2) = 0.601, P < .001).
Teeth at advanced developmental stages transplanted to surgically created sockets show an impaired postoperative root development. A possible explanation might be damage of Hertwig's epithelial root sheath during the transplantation procedure.
本研究旨在比较将牙齿移植到手术创建的牙槽窝或新鲜拔牙创部位后的牙根发育情况。
样本包括62例患者，共64颗移植的未成熟第三磨牙。所有移植牙均处于牙根发育阶段3到4期。22例中，用牙钻创建了新的牙槽窝。42颗移植到新鲜拔牙创部位的牙齿作为对照。术后牙根发育情况通过移植后即刻及最终随访时拍摄的口腔内X光片确定。对于所有移植牙，记录移植过程中的口外保存时间和尝试次数。
在牙根发育阶段3期，未观察到组间有显著差异。相比之下，在牙根发育阶段4期，移植到手术创建牙槽窝的牙齿最终牙根长度（P = .025）和牙根长度增加量（P = .038）显著低于对照组中的移植牙。此外，在发育阶段4期的制备牙槽窝组中，牙根长度增加量与口外保存时间（r = -0.910，r² = 0.828，P < .001）或受植牙槽窝的尝试次数（r = -0.775，r² = 0.601，P < .001）之间存在显著相关性。
移植到手术创建牙槽窝的发育晚期牙齿术后牙根发育受损。一种可能的解释可能是在移植过程中赫特维希上皮根鞘受到了损伤。
