Pre-treatment radiographic features predict root resorption of treated impacted maxillary central incisors.
OBJECTIVE
To determine independent predictors of root resorption for surgical-orthodontic treatment of impacted maxillary central incisors.


METHODS
The Department of Dentistry at Show Chwan Hospital, Changhua, Taiwan. Eighty patients with unilateral osseous-impacted maxillary central incisors receiving a surgical-orthodontic treatment.


METHODS
This is a retrospective observational study. Root resorption and its predictors were abstracted from patients' charts, pre-treatment cephalometric radiographs, and post-treatment periapical radiographs. Predictors included demographics, treatment duration, crown angle, crown height, crown depth, and root dilacerations.


RESULTS
The patients' mean age was 9.2 ± 2.3 years (6.4-20.6 years), and 60% were females. Impacted maxillary central incisors had greater root resorption than naturally erupted contralateral incisors (Δ = -2.8 mm, p < 0.001). Independent predictors of root resorption for impacted maxillary central incisors were shown by linear regression analysis to be crown height (β = -0.2, p < 0.01), crown depth (β = -0.3, p = 0.001), treatment duration (β = 0.2, p < 0.01), and root dilacerations (β = 3.1, p = 0.001).


CONCLUSIONS
Impacted maxillary central incisors had greater root resorption during surgical-orthodontic treatment than their naturally erupted contralateral incisors. Predictors of a greater root resorption were highly and deeply impacted incisors, longer treatment, and root dilacerations. These predictors may help to inform patient and family counseling before treatment.
Department of Dentistry, Show Chwan Hospital, Changhua, Taiwan.
K H
KH
Ho
Y F
YF
Liao
D000293:Adolescent; D002508:Cephalometry / Q000379:methods; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D005544:Forecasting; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging*; D008297:Male; D003765:Models, Dental; D009811:Odontometry / Q000379:methods; D010159:Palate / Q000000981:diagnostic imaging; D016300:Radiography, Bitewing; D012189:Retrospective Studies; D012307:Risk Factors; D012391:Root Resorption / Q000209:etiology*; D013997:Time Factors; D019228:Tooth Crown / Q000000981:diagnostic imaging; D014078:Tooth Eruption / Q000502:physiology; D014087:Tooth Movement Techniques / Q000379:methods*; D014092:Tooth Root / Q000002:abnormalities; D014095:Tooth, Impacted / Q000145:classification / Q000000981:diagnostic imaging* / Q000601:surgery; D055815:Young Adult