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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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Winter 2008
Volume 9 , Issue 4

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Implications of the inclination of the mandibular first molars in the extractionist versus expansionist debate

Donald J. Rinchuse, DMD, MS, MDS, PhD/Sanjivan Kandasamy, BDSc, BScDent, DocClinDent, MOrthRCS

Pages: 383–390
PMID: 19146020

Some orthodontic expansionists (versus extractionists) hold a notion that in the decision to treat nonextraction, expansion treatment can be predicated and dictated based on the degree of facial-lingual inclination of the mandibular molars (particularly the mandibular first molars). For instance, some modern-day expansionists argue that mandibular first molars with a facial crown lingual inclination of approximately –30 degrees (based on Andrews’ measurement) indicate that the mandibular arch, and subsequently the maxillary arch, needs to be developed or expanded to allow for more arch and tongue space. However, this thinking is based on a false premise; the mandibular first molars are normally lingually inclined approximately –30 degrees and not naturally found in an upright facial-lingual position of approximately –12 degrees. World J Orthod 2008;9:383–390

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