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Quintessence Publishing: Journals: ORTHODONTICS
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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Publication:
Summer 2001
Volume 2 , Issue 2

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The Fourth Dimension in Dentofacial Orthopedics: Treatment Timing for Class II and Class III Malocclusions

Tiziano Baccetti, DDS, PhD, Lorenzo Franchi, DDS, PhD

Pages: 159-167

Aim: This article demonstrates the significant impact of treatment timing on the outcome of functional jaw orthopedics for Class II and Class III malocclusions. Methods: Subjects with Class II and Class III malocclusions treated with functional appliances and face mask therapy, respectively, were analyzed using matched samples of untreated subjects as control groups. Both experimental and control groups were divided according to maturational stages. In particular, the cervical vertebral maturation method was applied to discriminate between subjects who started functional therapy of Class II malocclusion before the peak in mandibular growth velocity (early treatment group) and those who started during or slightly after this peak (late treatment group). Results: Both active treatment and posttreatment results of rapid maxillary expansion and face mask therapy for Class III malocclusions indicate that correction of the skeletal disharmony primarily depends on the amount of beneficial changes obtained during active therapy. The earlier the correction (ie, in the primary or early mixed dentitions), the greater the final favorable skeletal change in both the maxilla and the mandible. In Class II therapy, treatment with functional appliances during or slightly after the pubertal peak in growth velocity induces a supplementary elongation of the mandible that is more than twice that observed when treatment is performed before the peak. Conclusion: Ideal treatment timing for the Class III malocclusion is in the early mixed dentition, whereas it is in the circumpubertal period for the Class II malocclusion associated with mandibular deficiency. The cervical vertebral maturation method, a simple and reliable method for detection of the pubertal peak in skeletal growth of the individual patient, is described. World J Orthod 2001;2:159-167.

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