Open bite as a risk factor for orthodontic root resorption

Motokawa, Masahide, Terao, Akiko, Kaku, Masato , Kawata, Toshitsugu, Gonzales, Carmen, Darendeliler, M. Ali, and Tanne, Kazuo (2013) Open bite as a risk factor for orthodontic root resorption. European Journal of Orthodontics, 35 (6). pp. 790-795.

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The purpose of the present study was to clarify the prevalence and degree of root resorption induced by orthodontic treatment in patients with and without open bite. One hundred and eleven patients treated with multibracket appliances were retrospectively selected from the patients and divided into non-open bite (NOB) and open bite (OB) groups. The severity of root resorption and the root shape were classified into five groups on periapical radiographs before and after treatment. Moreover, only in the OB group, all teeth were sub-divided into functional and hypofunctional ones that are occluding and non-occluding.

As the results of multiple linear regression analysis of patient characteristics and clinical variables with the number of overall root resorption, the independent variables that were found to contribute significantly to root resorption were bite and abnormal root shape. The prevalences of root resorption evaluated in the number of patients were significantly higher in OB group than in NOB group, and those in the number of teeth were significantly higher in OB group than in NOB group, in particular anterior and premolar teeth. The prevalence of resorbed teeth with abnormal root shapes was also significantly higher in OB group than in NOB group. On the other hand, in OB group, the prevalences of root resorption and teeth with abnormal root shape were significantly greater in hypofunctional teeth than in normal functional teeth.

There are more teeth with root resorption and abnormal root shape in open bite cases than in normal bite cases, and more teeth with abnormal root shapes and root resorption in hypofunctional teeth than in functional teeth.

Item ID: 45157
Item Type: Article (Research - C1)
ISSN: 1460-2210
Keywords: open bite; orthodontic root resorption
Funders: Ministry of Education, Culture, Sports, Science and Technology of Japan (MECSST)
Projects and Grants: MECSST Grant-in-Aid for Basic research (C) (No. 22592285)
Date Deposited: 17 Aug 2016 00:20
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1105 Dentistry > 110506 Orthodontics and Dentofacial Orthopaedics @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920113 Oro-Dental Disorders @ 50%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920402 Dental Health @ 50%
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