PDF(Pubmed)
Abstract：
BACKGROUND: The purpose of this study was to evaluate and compare the incidence of orthodontically induced inflammatory root resorption (OIIRR) after en masse maxillary incisors intrusion and retraction with controlled tipping versus bodily movement using cone beam computed tomography (CBCT).
METHODS: This study is a retrospective study performed on CBCT scans of 36 adult females who had their maxillary first premolars extracted followed by en masse anterior retraction and intrusion using labial biocreative therapy type II. Subjects were divided into two groups of 18 subjects each based on the type of tooth movement required during en masse retraction: Group I; the controlled tipping group, and Group II; the bodily movement group. The amount of intrusion, crown and root retraction, change in incisor inclination, and difference in tooth length was measured from the CBCT scans. Independent t tests were used to compare the measurements between the two groups. Pearson rank correlation analysis was applied to identify the relationship between the mean dental changes and the mean changes in tooth length for all four upper incisors.
RESULTS: OIIRR was found in all four maxillary incisors in both groups. No significant differences were found between the two groups. OIIRR was positively correlated to the amount of root apex retraction and negatively correlated to the change in incisor inclination.
CONCLUSIONS: Anterior retraction and intrusion lead to obvious root resorption affecting all maxillary incisors. No significant differences were found between the two groups. Careful clinical monitoring is needed for patients requiring anterior retraction with intrusion with maximum anchorage.
METHODS: This study is a retrospective study performed on CBCT scans of 36 adult females who had their maxillary first premolars extracted followed by en masse anterior retraction and intrusion using labial biocreative therapy type II. Subjects were divided into two groups of 18 subjects each based on the type of tooth movement required during en masse retraction: Group I; the controlled tipping group, and Group II; the bodily movement group. The amount of intrusion, crown and root retraction, change in incisor inclination, and difference in tooth length was measured from the CBCT scans. Independent t tests were used to compare the measurements between the two groups. Pearson rank correlation analysis was applied to identify the relationship between the mean dental changes and the mean changes in tooth length for all four upper incisors.
RESULTS: OIIRR was found in all four maxillary incisors in both groups. No significant differences were found between the two groups. OIIRR was positively correlated to the amount of root apex retraction and negatively correlated to the change in incisor inclination.
CONCLUSIONS: Anterior retraction and intrusion lead to obvious root resorption affecting all maxillary incisors. No significant differences were found between the two groups. Careful clinical monitoring is needed for patients requiring anterior retraction with intrusion with maximum anchorage.
摘要：
背景：本研究的目的是使用锥形束计算机断层扫描（CBCT）评估和比较正畸诱导的炎性牙根吸收（OIIRR）的发生率。
方法：这项研究是一项回顾性研究，对36名成年女性进行CBCT扫描，这些女性上颌第一前磨牙拔除，然后使用II型唇生物创造疗法进行整体前缩和侵入。根据整体缩回过程中所需的牙齿移动类型，将受试者分为两组，每组18名受试者：I组；控制倾斜组，和第二组；身体运动组。入侵的数量，牙冠和牙根缩回，门牙倾斜度的变化，从CBCT扫描测量牙齿长度的差异。采用独立t检验比较两组的测量值。应用Pearson秩相关分析来确定所有四个上切牙的平均牙齿变化与牙齿长度的平均变化之间的关系。
结果：在两组的所有四个上颌切牙中均发现了OIIRR。两组间无显著性差异。OIIRR与根尖回缩量呈正相关，与切牙倾角变化呈负相关。
结论：前缩和侵入导致明显的牙根吸收影响所有上颌切牙。两组间无显著性差异。对于需要前缩并具有最大锚固能力的患者，需要进行仔细的临床监测。
方法：这项研究是一项回顾性研究，对36名成年女性进行CBCT扫描，这些女性上颌第一前磨牙拔除，然后使用II型唇生物创造疗法进行整体前缩和侵入。根据整体缩回过程中所需的牙齿移动类型，将受试者分为两组，每组18名受试者：I组；控制倾斜组，和第二组；身体运动组。入侵的数量，牙冠和牙根缩回，门牙倾斜度的变化，从CBCT扫描测量牙齿长度的差异。采用独立t检验比较两组的测量值。应用Pearson秩相关分析来确定所有四个上切牙的平均牙齿变化与牙齿长度的平均变化之间的关系。
结果：在两组的所有四个上颌切牙中均发现了OIIRR。两组间无显著性差异。OIIRR与根尖回缩量呈正相关，与切牙倾角变化呈负相关。
结论：前缩和侵入导致明显的牙根吸收影响所有上颌切牙。两组间无显著性差异。对于需要前缩并具有最大锚固能力的患者，需要进行仔细的临床监测。
