Autotransplantation of human premolars

Lars Kristerson
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引用次数: 177

Abstract

The purpose of the present study was to identify factors which might influence the success of autotransplantion, such as root development, root resorption, pulp condition and tooth eruption. The material consisted of 100 human premolars transplanted in 87 patients. The observation period ranged from 3–18 years, with a mean value 6.3 years. Clinical and radiographic examinations were performed. The transplanted premolars were divided into 7 stages of root development. At the final control, 93 teeth remained and 7 teeth were extracted. Periodontal healing without root resorption was related to stage of root development. It decreased from 93% in teeth with ¾ root development to 37% in teeth with fully developed roots. Inflammatory root resorption was seen in 7 cases and replacement root resorption in 12 cases. Pulp revascularization was observed in 100% in stages with initial root development to ½ root development and decreased to 0% for teeth with fully developed roots. Pulp obliteration was observed in all cases with revascularized pulp tissue. The gingival condition was similar to contralateral, not transplanted premolars or adjacent teeth. Root growth increased with the stage of root development at the time of transplantation.

It is concluded that transplantation of premolars with ½–¾ root development provides a good chance of pulp survival, limited risk of root resorption and ensures sufficient final root length, and is thus recommended.

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人类前磨牙的自体移植
本研究的目的是探讨影响自体移植成功的因素,如牙根发育、牙根吸收、牙髓状况和牙萌出等。该材料由87例患者移植的100颗人前磨牙组成。观察期3 ~ 18年,平均6.3年。进行了临床和影像学检查。移植前磨牙的根发育分为7个阶段。在最终对照时,保留牙93颗,拔除牙7颗。牙周愈合无根吸收与牙根发育阶段有关。从牙根发育3 / 4的牙齿的93%下降到牙根完全发育的牙齿的37%。炎性根吸收7例,置换根吸收12例。牙髓血运重建率在牙根发育初期至半根发育阶段为100%,而在牙根发育完全的牙髓血运重建率为0%。所有有血管重建的牙髓组织均出现牙髓闭塞。牙龈状况与对侧未移植前磨牙或邻牙相似。根系生长随移栽时根系发育阶段的增加而增加。结论:1 / 2 ~ 3 / 4根发育的前磨牙移植具有良好的牙髓存活机会、有限的根吸收风险和足够的终根长度,因此推荐进行移植。
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