Sagittal and Vertical Growth of the Maxillo–Mandibular Complex in Untreated Children: A Longitudinal Study on Lateral Cephalograms Derived from Cone Beam Computed Tomography

Abstract

The aim of this longitudinal study was to evaluate the sagittal and vertical growth of the maxillo–mandibular complex in untreated children using orthogonal lateral cephalograms compressed from cone beam computed tomography (CBCT). Two sets of scans, on 12 males (mean 8.75 years at T1, and 11.52 years at T2) and 18 females (mean 9.09 years at T1, and 10.80 years at T2), were analyzed using Dolphin 3D imaging. The displacements of the landmarks and rotations of both jaws relative to the cranial base were measured using the cranial base, and the maxillary and mandibular core lines. From T1 to T2, relative to the cranial base, the nasion, orbitale, A-point, and B-point moved anteriorly and inferiorly. The porion moved posteriorly and inferiorly. The ANB and mandibular plane angle decreased. All but one subject had forward rotation in reference to the cranial base. The maxillary and mandibular superimpositions showed no sagittal change on the A-point and B-point. The U6 and U1 erupted at 0.94 and 1.01 mm/year (males) and 0.82 and 0.95 mm/year (females), respectively. The L6 and L1 erupted at 0.66 and 0.88 mm/year (males), and at 0.41 mm/year for both the L6 and the L1 (females), respectively.

Correlación tomográfica de la distancia transversal mandibular y la inclinación de molares inferiores permanentes

“…Por otro lado, (Yi et al, 2021), plantea como objetivo evaluar el crecimiento transversal longitudinal del complejo maxilomandibular en TAC de haz cónico en niños no tratados, evalúa medidas esqueléticas, dentales y dentoalveolares, concluye que los procesos dentoalveolares mandibulares no tienen la misma tasa de crecimiento que los puntos antegonial, incluso señala que el crecimiento alveolar parece ser independiente de la inclinación dental. En el presente estudio se concluye que no existe una correlación significativa entre la distancia transversal mandibular y la inclinación de los primeros molares inferiores.…”