Time and pattern of the fusion of the spheno-occipital synchondrosis in patients with skeletal Class i and Class III malocclusion

Document Type

Article

Publication Title

Angle Orthodontist

Abstract

Objectives: To investigate the time and pattern of fusion of the spheno-occipital synchondrosis in patients with skeletal Class I and Class III malocclusion using cone-beam computed tomography (CBCT). Materials and Methods: A total of 262 CBCT images were collected: 140 skeletal Class I (08 , ANB , 48; 71 males, 69 females) and 122 skeletal Class III (ANB _ 08; 61 males and 61 females). The fusion stages were identified using CBCT images of a six-stage system defined by the appearance of osseous cores and ossifying vestige in the synchondrosis. The age distributions of each stage and the pattern of fusion were evaluated. Results: The stages of fusion progressed with increasing age (P , .05, r .824), and the age distributions in the female groups were generally 1 to 3 years younger than those in the male groups. However, no significant differences were observed between the skeletal Class I and Class III groups regarding the time of ossification of the synchondrosis. The osseous cores appeared most frequently in the supero-center part, followed by the mid-center part of the synchondrosis. Conclusions: The time and pattern of fusion of the spheno-occipital synchondrosis are not apparently different between patients with Class I malocclusion and those with Class III malocclusion. The osseous cores appear frequently in the supero-center and mid-center of the synchondrosis with various patterns before the end of the pubertal growth spurt period.

First Page

470

Last Page

479

DOI

10.2319/052218-386.1

Publication Date

1-1-2019

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