International orthodontics · 2026
Impact of upper central incisor contact with incisive canal on root resorption and retraction efficiency: A retrospective CBCT study.
СтатьяНазвание и аннотация: Перевод пока не подготовлен
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Lu Wenhsuan, Xin Tianyi, Liu Liting, Teng Jade, Han Bing, Liu Xiaomo, Chen Si, Zhang Xiaoyun
Аннотация
OBJECTIVE: To explore the impact of contact between the upper central incisors' roots and the incisive canal on retraction efficiency and root resorption during extensive orthodontic retraction.
MATERIALS AND METHODS: The retrospective study used cone-beam computed tomography (CBCT) data from 65 patients undergoing orthodontic extraction treatment with retraction of incisors (≥3mm) between 2018 and 2023. All eligible cases during this period were consecutively included. CBCT scans were obtained before and after the treatment. The changes in root length (ΔRL), U1/PP, U1-IC distance, horizontal retraction distance of the incisal edge (HRD), and horizontal retraction distance of the alveolar ridge crest (HRD') were compared between the contact and non-contact groups.
RESULTS: Among the 65 included patients, approximately 30.77% of the cases exhibited contact between the upper central incisor roots and the incisive canal. The initial upper incisor to palatal plane angle (U1/PP) in the non-contact group was significantly greater than that in the contact group. However, the change of upper incisor to palatal plane angle (ΔU1/PP) following treatment showed no statistically significant difference between the two groups. The amount of root resorption in the contact group was significantly greater than that in the non-contact group, but there were no significant differences in HRD and HRD' between the two groups.
CONCLUSION: Contact between the roots of the maxillary incisors and the incisive canal was associated with increased root resorption. Patients with smaller initial U1/PP values were more likely to experience such contact. Although retraction of the incisal edges and the alveolar ridge crest was not significantly affected, this type of contact may represent a biological compromise and should be avoided when possible.
MATERIALS AND METHODS: The retrospective study used cone-beam computed tomography (CBCT) data from 65 patients undergoing orthodontic extraction treatment with retraction of incisors (≥3mm) between 2018 and 2023. All eligible cases during this period were consecutively included. CBCT scans were obtained before and after the treatment. The changes in root length (ΔRL), U1/PP, U1-IC distance, horizontal retraction distance of the incisal edge (HRD), and horizontal retraction distance of the alveolar ridge crest (HRD') were compared between the contact and non-contact groups.
RESULTS: Among the 65 included patients, approximately 30.77% of the cases exhibited contact between the upper central incisor roots and the incisive canal. The initial upper incisor to palatal plane angle (U1/PP) in the non-contact group was significantly greater than that in the contact group. However, the change of upper incisor to palatal plane angle (ΔU1/PP) following treatment showed no statistically significant difference between the two groups. The amount of root resorption in the contact group was significantly greater than that in the non-contact group, but there were no significant differences in HRD and HRD' between the two groups.
CONCLUSION: Contact between the roots of the maxillary incisors and the incisive canal was associated with increased root resorption. Patients with smaller initial U1/PP values were more likely to experience such contact. Although retraction of the incisal edges and the alveolar ridge crest was not significantly affected, this type of contact may represent a biological compromise and should be avoided when possible.