Brin I, Ben-Bassat Y, Heling I, Engelberg A
Department of Orthodontics, Hebrew University Hadassah School of Dental Medicine, Jerusalem, Israel.
Eur J Orthod. 1991 Oct;13(5):372-7. doi: 10.1093/ejo/13.5.372.
The reaction of previously traumatized teeth to orthodontic force application was investigated. Four groups of children were examined: group T comprised 56 children who encountered trauma to their maxillary incisors; group O comprised 29 orthodontic patients with intact incisors; group TO comprised 28 previously traumatized orthodontic patients; and group C served as the control group (n = 26). Orthodontic treatment was restricted to tipping movement executed only by means of removable appliances. Groups T, O, and TO were followed up longitudinally by means of clinical and radiographic examinations. In most of the cases the reported trauma occurred to teeth with completed roots and affected the crown only. Group TO presented the highest, though relatively moderate, prevalence of root resorption (27.8 per cent) and was followed by groups O and T (6.7 and 7.8 per cent, respectively) while in the control group no resorption was observed. Electrical pulp testing revealed the highest prevalence of loss of tooth vitality in group TO (7.3 per cent) in which the highest prevalence of pulp obliteration was also found. It can be concluded that the combination of trauma with orthodontic tipping renders the teeth more susceptible to complications, especially to root resorption and loss of vitality.
研究了既往受过创伤的牙齿对正畸力施加的反应。对四组儿童进行了检查：T组包括56名上颌切牙受过创伤的儿童；O组包括29名切牙完好的正畸患者；TO组包括28名既往受过创伤的正畸患者；C组作为对照组（n = 26）。正畸治疗仅限于仅通过可摘矫治器进行的倾斜移动。通过临床和影像学检查对T组、O组和TO组进行纵向随访。在大多数情况下，报告的创伤发生在牙根已发育完成的牙齿上，且仅影响牙冠。TO组牙根吸收的发生率最高，尽管相对适中（27.8%），其次是O组和T组（分别为6.7%和7.8%），而对照组未观察到牙根吸收。牙髓电测试显示TO组牙齿活力丧失的发生率最高（7.3%），该组牙髓闭锁的发生率也最高。可以得出结论，创伤与正畸倾斜相结合使牙齿更容易出现并发症，尤其是牙根吸收和活力丧失。
