Geometric morphometric assessment of treatment effects of maxillary protraction combined with chin cup appliance on the maxillofacial complex

Abstract

The aim of this study was to investigate the treatment effects on the maxillofacial complex by maxillary protraction combined with chin cup therapy among growing children. An effective geometric morphometric assessment of cephalometric radiographs, using Procrustes analysis and thin-plate spline analysis, was applied to evaluate shape change in the craniofacial and midfacial configurations of a treated sample of 20 children with skeletal Class III malocclusion. This was compared with matched untreated skeletal Class III controls. Marked treatment induced change involved the maxilla and the mandible. Major deformation consisted of forward advancement of the maxillary complex with negligible rotation of the palatal plane and a forward direction of growth of the mandibular condyle associated with a restriction in sagittal advancement of the chin. Considerable dentoalveolar components contributed to the correction of anterior crossbite. Further detailed study of skeletofacial remodelling in response to maxillary protraction in other skeletal components, including the cranial base and the mandibular complex that contribute to Class III skeletal discrepancies, is warranted.

Orthopedic Effect of Chin Cup during Mixed Dentition Stage

“…14 Similar findings were reported in earlier studies. 2,4 In contrast to the earlier reports, 3,17 our study showed significant reduction of Co-Go. The study showed positive OJ in all patients at end of CC therapy.…”

“…Chin cup is the preferred appliance for growing children with mandibular prognathism. [1][2][3] Chin cup is designed to suppress and/or redirect the mandibular growth, close the gonial angle, and remodel the mandibular and temporomandibular joint. The CC appliances can be divided into two subcategories: The vertical pull CC and the occipital pull CC.…”

Craniofacial morphometric analysis of mandibular prognathism

“…The reliability coefficients were from 0AE973 to 1AE00, indicating a high level of reliability. These had been previously assessed (11,24,25).…”

“…Mandibular prognathism or skeletal Class III malocclusion with a prognathic mandible has long been viewed as one of the most severe maxillofacial deformities (7). Facial growth modification can be an effective method of resolving skeletal Class III jaw discrepancies with dentofacial orthopaedic appliances (10, 11). Nevertheless, continued growth in early adulthood may detract from treatment results obtained in childhood or adolescence.…”

The effects of combined skeletal anchor plates and removable TMA traction springs in growing patients with maxillary deficiency

“…Previous investigations evaluated skeletal changes produced by either rapid maxillary expansion and face mask therapy 44 or maxillary protraction in association with a chincup 45 . Where the maxillary expansion and protraction study showed less pronounced maxillary changes when compared with the effects of the treatment protocol used in this study.…”