抄録
The purposes of this study were to compare cranial base morphology in different types of sagittal malocclusion and to explore regular patterns.
Fifty-six cases of Class I, II and III malocclusion (age: 10-15 years old) with average angle were selected; this comprised 17 cases in the Angle Class I group, 20 cases in the Class II group and 19 cases in the Class III group. The analysis of the cranial base index for the three groups was performed, including one-way analysis of variance for paired comparison.
Significant differences were found among the three groups for posterior cranial base length, which gradually decreased from Class I via Class II to Class III. The gradual decrease of intermediate cranial base angle from Class I to Class III showed statistical differences. Furthermore, there were gradual increases of anterior cranial base angle and BAS-FH angle, which also showed statistical differences. The length of the anterior cranial base(S-N) of Class II decreased, and no significant differences were found between Class I and III malocclusion for the length of SN. No significant differences were found for the cranial base angle, sella angle, cranial base angle, posterior cranial base angle and the length of SO-Ar in different sagittal directions.
The structure of the cranial base in sagittal malocclusion presented some regularities, and it could be considered that the growth of the cranial base was involved in the development of malocclusion. The posterior cranial base and sella had a significant influence on the formation of sagittal malocclusion.
