Changes in longitudinal craniofacial growth in subjects with normal occlusions using the Ricketts analysis.
OBJECTIVE
This study was designed to define the Korean norm values for the Ricketts analysis.


METHODS
In this longitudinal study, lateral cephalograms of 31 subjects with normal occlusion were taken biennially from ages 9-19 years. Cephalometric measurements were performed. Parameters for which the 10-year change did not exceed one standard deviation were defined as unchanged. The means and standard deviations for the measured parameters were determined for each age group.


RESULTS
No significant changes in growth were observed in the molar relationship, incisor overjet, incisor overbite, mandibular incisor extrusion, interincisor angle, lower incisor tip (B1) to A point-Pogonion (A-PO) plane, upper incisor tip (A1) to A-PO plane, B1 inclination to A-PO, A1 inclination to A-PO, B1 inclination to Frankfurt plane (FH), convexity, lower facial height, facial axis, maxillary depth, maxillary height, palatal plane to FH, cranial deflection, ramus Xi position, or porion location. Continual changes over the 10 years of growth were observed in the maxillary first molar distal position to pterygoid true vertical plane, facial depth, mandibular plane to FH, anterior cranial length, mandibular arc, and corpus length.


CONCLUSIONS
Clinicians can apply the Korean norms at age 9 as determined in this study when using the Ricketts analysis. The patient's age at the beginning of treatment and their sex should be taken into consideration when drawing visual treatment objectives.
Department of Orthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea.
Eun-Ju
EJ
Bae
Department of Orthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea.
Hye-Jin
HJ
Kwon
Department of Orthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea.
Oh-Won
OW
Kwon
Cephalometrics; Growth and development; Korean norms; Ricketts analysis