Morphology and growth in convex profile facial patterns: a longitudinal study.
Two groups of females, one with normal anteroposterior jaw-base relationships and the other with distal jaw-base relationships, were selected at age 6 and compared longitudinally up to age 18. The purposes of this study were, first, to reveal morphological factors that caused or contributed to a distal jaw-base relationship, and second, to compare growth in the two groups. A distal jaw-base relationship is not a morphological entity caused by some specific aberration in the cranial base or jaws. Rather, it is the result of a combination of predisposing deviations with varying degrees of gravity. A short mandibular corpus and a large MP-SN angle were the only deviations with significant group differences. Distal jaw-base relationships generally worsened with age as compared with normal anteroposterior jaw-base relationships. Inadequate increase in mandibular corpus length in the 6- to 12-year period contributed to the worsening, as did the mandible growing more vertically than normal after age 12.
Karlsen
A T
AT
Department of Orthodontics, University of Oslo, Norway.
Krogstad
O
O
D000293:Adolescent; D016022:Case-Control Studies; D002508:Cephalometry; D002648:Child; D016002:Discriminant Analysis; D005147:Facial Bones / Q000033:anatomy & histology* / Q000254:growth & development; D005260:Female; D006801:Humans; D007574:Jaw Relation Record; D008137:Longitudinal Studies; D008312:Malocclusion, Angle Class II / Q000503:physiopathology*; D008334:Mandible / Q000254:growth & development; D008445:Maxillofacial Development; D012016:Reference Values; D019291:Skull Base / Q000254:growth & development; D014716:Vertical Dimension