Imaging Sci Dent.  2011 Mar;41(1):17-21. 10.5624/isd.2011.41.1.17.

External root resorption after orthodontic treatment: a study of contributing factors

• Jung YH
• Cho BH

• KMID: 1974395
• DOI: http://doi.org/10.5624/isd.2011.41.1.17

Abstract

PURPOSE
The purpose of this study was to examine the patient- and treatment-related etiologic factors of external root resorption.
MATERIALS AND METHODS
This study consisted of 163 patients who had completed orthodontic treatments and taken the pre- and post-treatment panoramic and lateral cephalometric radiographs. The length of tooth was measured from the tooth apex to the incisal edge or cusp tip on the panoramic radiograph. Overbite and overjet were measured from the pre- and post-treatment lateral cephalometric radiographs. The root resorption of each tooth and the factors of malocclusion were analyzed with an analysis of variance. A paired t test was performed to compare the mean amount of root resorption between male and female, between extraction and non-extraction cases, and between surgery and non-surgery groups. Correlation coefficients were measured to assess the relationship between the amount of root resorption and the age in which the orthodontic treatment started, the degree of changes in overbite and overjet, and the duration of treatment.
RESULTS
Maxillary central incisor was the most resorbed tooth, followed by the maxillary lateral incisor, the mandibular central incisor, and the mandibular lateral incisor. The history of tooth extraction was significantly associated with the root resorption. The duration of orthodontic treatment was positively correlated with the amount of root resorption.
CONCLUSION
These findings show that orthodontic treatment should be carefully performed in patients who need the treatment for a long period and with a pre-treatment extraction of teeth.

Keyword

Root Resorption; Orthodontics; Panoramic Radiography; Incisor

MeSH Terms

Female
Humans
Incisor
Male
Malocclusion
Orthodontics
Overbite
Radiography, Panoramic
Root Resorption
Tooth
Tooth Apex
Tooth Extraction

Figure

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  Fig. 1 The amount of root resorption by tooth type* (N=326†). *Significant differences for tooth types by ANOVA (P<0.01). †Data from the left and right sides were pooled to simplify presentation, so counts are of teeth, not person.

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