[Factors associated with spontaneous re-eruption of traumatically intruded permanent anterior teeth in children and adolescents].

OBJECTIVE

To analyze the factors related to spontaneous re-eruption after intruded injury in permanent anterior teeth in children and adolescents.

METHODS

Clinical data from 5- to 17-year-old patients who sustained intrusive luxation of permanent anterior teeth and treated in the Department of Pedia-tric Dentistry of Peking University School and Hospital of Stomatology from June 2015 to August 2024 were reviewed. Information of age, gender, degree of intrusion, direction of intrusion, tooth development, concomitant injuries, luxation and post-osteoclastic eruption of the adjacent teeth were recorded. The patients were divided into two groups based on whether they showed spontaneous re-eruption during advised observation after intrusion. Univariate and multifactor analysis were performed using Logistic regression.

RESULTS

Data from 170 teeth in 139 patients whose age ranging from 5.3-16.3 years [mean age (9.0± 2.1) years] were examined. A gender disparity was observed among the patients, with 84 being male and 55 being female. Among the 170 teeth, 112 were categorized as successfully spontaneous re-eruption during advised observation after intrusion, while 58 were not. In terms of the degree of intrusion, 45 teeth (26.47%) had intrusion less than 3 mm, 102 teeth (60.00%) experienced intrusion between 3-7 mm, and 23 teeth (13.53%) were faced with intrusion exceeding 7 mm. As for the direction of intrusion, 117 teeth (68.82%) were straight intrusion while mesial-distal and buccal-lingual intrusion respectively accounting for 17 (10.00%) and 23 (13.53%). Multivariate Logistic regression analysis showed that mesial-distal intrusion (=0.167, 95%: 0.031-0.9048, =0.038), intrusion of >7 mm (=0.065, 95%: 0.014-0.299, < 0.001) and luxation of adjacent teeth (=0.369, 95%: 0.144-0.944, =0.037) were independent risk factors for spontaneous re-eruption of traumatically intruded permanent anterior teeth in children and adolescents during advised observation after intrusion, while intrusion of < 3 mm (=9.860, 95%: 2.430-40.009, =0.001) and post-osteoclastic eruption of adjacent teeth (=4.712, 95%: 1.528-14.531, =0.007) were independent protective factors. The possibility of spontaneous re-eruption in permanent anterior teeth during advised observation after intrusion was decreased by 61.1% with the increase of root development using Cvek' s classification (=0.611, 95%: 0.408-0.914, =0.017). Age (=1.077, 95%: 0.763-1.521, =0.673) and laceration of gingival (=0.865, 95%: 0.290-2.578, =0.794) didn't significantly affect the spontaneous re-eruption during advised observation after intrusion.

CONCLUSION

In this study, mesial-distal intrusion, intrusion of >7 mm and luxation of adjacent teeth were independent risk factors for spontaneous re-eruption of traumatically intruded permanent anterior teeth in children and adolescents during advised observation, while intrusion of < 3 mm and post-osteoclastic eruption of adjacent teeth were served as independent protective factors.