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Related Experiment Videos

Tooth movement following third molar removal

G A Thurnwald1, F N Monsour, P R L'Estrange

  • 1Division of Oral & Maxillofacial Surgery, University of Queensland Dental School, Brisbane, Australia.

Australian Orthodontic Journal
|March 1, 1994
PubMed
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Removal of impacted third molars significantly shifts mandibular second molars buccally. Mesioangular impactions, especially bilateral, cause greater arch width increases post-surgery.

Area of Science:

  • Dentistry
  • Orthodontics
  • Oral Surgery

Background:

  • Impacted mandibular third molars are common in young adults.
  • Their removal can influence adjacent teeth and arch dimensions.
  • Understanding post-surgical tooth movement is crucial for treatment planning.

Purpose of the Study:

  • To analyze changes in mandibular arch dimensions after impacted third molar removal.
  • To investigate the correlation between impaction type and tooth movement.
  • To explore the biomechanical forces involved in third molar impaction.

Main Methods:

  • Study casts of 45 young adults were analyzed pre- and post-surgery (12 weeks).
  • Measurements included mandibular arch length and width at specific points.

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  • Statistical analysis was performed to assess significance of changes (p < 0.01, p < 0.05).

    • Main Results:

    • Significant buccal movement of mandibular second molars was observed post-surgery.
    • Bilateral mesioangular impactions led to greater arch width increases than unilateral or other types.
    • Pre-operative lingual inclination of second molars correlated with the greatest tooth movement.

    Conclusions:

    • Impacted mandibular third molars may exert lingual pressure on adjacent second molars.
    • Surgical removal allows reversal of this lingual displacement due to functional forces.
    • Mesioangular impaction characteristics influence post-surgical mandibular arch changes.