AIM: This retrospective study assessed the cranial base growth and development in different facial types in Class I, II and III orthopedic maxillomandibular relationship. METHODS: A random sample of 300 Brazilian Caucasian patients (131 males, 169 females), with initial mean age of 10 years and 2 months (mixed dentition) and final mean age 14 years and 8 months (second molar in occlusion) and mean observation time of 4 years and 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 CF-Po linear measure in T1 and T2. All Classes were studied together and separately, considering facial type and gender. ANOVA variance analysis was carried out. RESULTS AND CONCLUSIONS: Retroversion facial type was significantly unfavorable to Class III correction in males; it showed unfavorable tendency to mandibular Class II correction and favorable anteroposterior growth tendency in Class I. Neutroversion was significantly favorable to mandibular Class III correction in both genders; it showed favorable tendency to mandibular Class II correction and favorable anteroposterior growth tendency to Class I. Proversion was significantly unfavorable and favorable to Class III and Class II correction in both genders, respectively; it showed favorable anteroposterior growth tendency to Class I mainly in males.
Cranial base; Growth; Facial types; Orthopedic maxillomandibular relationship
