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Quintessence Publishing: Journals: ORTHODONTICS
The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by
Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

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Spring 2010
Volume 11 , Issue 1

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Dentoalveolar Changes After Unilateral Extractions Of Mandibular First Molars And Their Influence On Third Molar Development And Position

Antonio David Corrêa Normando, DDS, MS/Francisco Ajalmar Maia, DDS, MS, PhD/Weber José da Silva Ursi, DDS, MS, PhD/José Leonardo Simone, DDS, MS, PhD

Pages: 55–60
PMID: 20209178

Aim: To investigate the spontaneous tooth position changes after unilateral extraction of mandibular first molars and the influence on third molar position. Methods: Panoramic radiographs of 111 individuals (mean age 19 years 8 months) in whom one mandibular first molar was extracted at least 5 years prior. Comparison of all measurements of the control and the affected side was performed by paired Student t test. Results: The mandibular second molars tipped mesially, whereas the premolars, canines, and incisors moved distally toward the extraction space. Vertical alveolar resorption was significant, particularly in older patients. Mesial inclination of the third molar occurred in only subjects in whom this tooth was completely developed. No significant vertical change of the third molars was observed. Conclusion: Unilateral extraction of mandibular first molars causes a significant displacement of all teeth of the affected side toward the extraction site and a progressive vertical bone resorption of this area. The closer the teeth are to the extraction site, the more they are affected. No significant changes were observed on third molar vertical position. World J Orthod 2010;11:55–60.

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