AIM: This retrospective study evaluated the cranial base mean growth in different facial types and orthopedic maxillomandibular relationship. METHODS: A random sample of 300 Brazilian Caucasian patients (131 males, 169 females), initial and final mean age (10 years 2 months-mixed dentition; 14 years 8 months-second molar occlusion) and mean observation time (4 years 5 months) was selected at a private clinic in São Paulo. There were 118 Class I; 151 Class II and 31 Class III. All 600 lateral cephalometric radiographs were taken using the same x-rays equipment. Ricketts and Schwarz analyses modified by Faltin were used. The same examiner performed manually the linear measures (Ba-Na, CC-Na and CC-Ba) in T1 and T2. All Classes were studied together and separately considering facial type and gender. Paired t-test and ANOVA were carried out. RESULTS AND CONCLUSIONS: The retroversion facial type grew significantly more in CC-Na in Class II, being unfavorable to Class II correction in females; with favorable tendency in Class III and an expecting growth in Class I. Neutroversion grew significantly more in CC-Na in Class I and II, being unfavorable in Class II; it had equitable growth of CC-Na and CC-Ba in Class III and it had considerably greater mean growth than the retroversion in Class I. Proversion had CC-Na and CC-Ba equitable growth in all Classes, it was significantly favorable in mandibular Class II; favorable tendency in mandibular Class III and it had the greatest mean growth in Class I.
Cranial base; Facial types; Orthopedic maxillomandibular relationship
