Factors associated with spontaneous mesialization of impacted mandibular third molars after second molar protractionopen access
- Authors
- Baik, Un-Bong; Kang, Jin Hye; Lee, Ui-Lyong; Vaid, Nikhilesh R.; Kim, Yoon-Ji; Lee, Dong-Yul
- Issue Date
- Mar-2020
- Publisher
- E H ANGLE EDUCATION RESEARCH FOUNDATION, INC
- Keywords
- Molar protraction; Impacted third molar; Missing posterior teeth
- Citation
- Angle Orthodontist, v.90, no.2, pp 181 - 186
- Pages
- 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- Angle Orthodontist
- Volume
- 90
- Number
- 2
- Start Page
- 181
- End Page
- 186
- URI
- https://scholarworks.korea.ac.kr/kumedicine/handle/2020.sw.kumedicine/28202
- DOI
- 10.2319/050919-322.1
- ISSN
- 0003-3219
1945-7103
- Abstract
- Objectives: To investigate factors associated with spontaneous mesialization of impacted third molars after second molar protraction to close the space caused by a missing mandibular first molar (L-6) or retained deciduous mandibular second molars with a missing succedaneous premolar (LE). Materials and Methods: Panoramic radiographs of patients treated with mandibular second molar protraction to close the space due to missing L-6 or L-E (14 males, 36 females, mean age = 18.6 +/- 4.4 years) were analyzed before treatment (T1) and after second molar protraction (T2). Factors associated with the amount of third molar mesialization were investigated using regression analyses. Results: Mandibular second molars were protracted by 5.1 +/- 2.1 mm and 5.8 +/- 2.7 mm, measured at the crown and root furcation, respectively. After second molar protraction, third molars showed spontaneous mesialization by 4.3 +/- 1.6 mm and 3.8 +/- 2.6 mm, measured at the crown and root furcation, respectively. Nolla's stage of the third molar at T1 (B = 0.20, P =.026) and second molar protraction time (B = 0.04, P = .042) were significantly associated with the amount of third molar mesialization. Conclusions: Greater third molar mesialization was observed when Nolla's stage of the third molar was higher before treatment and when the second molar protraction time was longer.
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- Appears in
Collections - 2. Clinical Science > Department of Orthodontics > 1. Journal Articles
- 2. Clinical Science > Department of Dentistry > 1. Journal Articles
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