Factors associated with spontaneous mesialization of impacted mandibular third molars after second molar protraction

Un Bong Baik, Jin Hye Kang, Ui Lyong Lee, Nikhilesh R. Vaid, Yoon Ji Kim, Dong Yul Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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 (L-E). 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 ¼ 18.6 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 6 2.1 mm and 5.8 6 2.7 mm, measured at the crown and root furcation, respectively. After second molar protraction, third molars showed spontaneous mesialization by 4.3 6 1.6 mm and 3.8 6 2.6 mm, measured at the crown and root furcation, respectively. Nolla’s stage of the third molar at T1 (B ¼ 0.20, P ¼ .026) and second molar protraction time (B ¼ 0.04, P ¼ .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.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalAngle Orthodontist
Volume90
Issue number2
DOIs
Publication statusPublished - 2020 Mar 1

Keywords

  • Impacted third molar
  • Missing posterior teeth
  • Molar protraction

ASJC Scopus subject areas

  • Orthodontics

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