Apical root resorption during orthodontic treatment A prospective study using cone beam CT

作者：Lund Henrik^*; Grondahl Kerstin; Hansen Ken; Grondahl Hans Goran

来源：The Angle Orthodontist, 2012, 82(3): 480-487.

DOI：10.2319/061311-390.1

• CBCT
• Root resorption
• Adolescents
• Orthodontics

Objective: To investigate the incidence and severity of root resorption during orthodontic treatment by means of cone beam computed tomography (CBCT) and to explore factors affecting orthodontically induced inflammatory root resorption (OIIRR). %26lt;br%26gt;Materials and Methods: CBCT examinations were performed on 152 patients with Class I malocclusion. All roots from incisors to first molars were assessed on two or three occasions. %26lt;br%26gt;Results: At treatment end, 94% of patients had %26gt;= 1 root with shortening %26gt;1 mm, and 6.6% had %26gt;= 1 tooth where it exceeded 4 mm. Among teeth, 56.3% of upper lateral incisors had root shortening %26gt;1 mm. Of upper incisors and the palatal root of upper premolars, 2.6% showed root shortenings %26gt;4 mm. Slanted surface resorptions of buccal and palatal surfaces were found in 15.1% of upper central and 11.5% of lateral incisors. Monthly root shortening was greater after 6-month control than before. Upper jaw teeth and anterior teeth were significantly associated with the degree of root shortening. Gender, root length at baseline, and treatment duration were not. %26lt;br%26gt;Conclusion: Practically all patients and up to 91% of all teeth showed some degree of root shortening, but few patients and teeth had root shortenings %26gt;4 mm. Slanted root resorption was found on root surfaces that could be evaluated only by a tomographic technique. A CBCT technique can provide more valid and accurate information about root resorption. (Angle Orthod. 2012;82:480-487.)

• 出版日期2012-5