In this study, we investigated the influence of the anteroposterior diameter and basal angle of the skull base on the maxillofacial morphology. The research materials were lateral cephalograms of 30 adult female patients on the first examination who received orthodontic treatment at the Orthodontic Department of Kanazawa Medical University Hospital. The 20 measurement items below were set based on digital cephalograms acquired by the standard method. (1. N-S 2. S-Ba 3. ∠N-S-Ba 4. Ptm-ANS/NF 5. SN-palatal pl. 6. Go-Me 7. Ar-Me 8. Ar-Go 9. ∠SN-Mand.pl. 10. Gonial Angle 11. ∠SN-Occ.pl. 12. N-Me 13. N-NF 14. Me-NF 15. S-NF 16. Go-NF 17. U1/NF 18. U6/NF 19. L1/Mand.pl. 20. L6/Mand.pl.).
Regarding the study method, firstly, analysis of variance was performed to confirm intra-individual variation of each of the data to investigate whether the measurement items can be compared using the data as a preliminary experiment. No significant difference was noted in intra-individual variation in any measurement item, confirming that inter-individual variation can be compared using the data.
Then, the correlations between the measured values of each measurement item of 1. N-S 2. S-Ba 3. ∠N-S-Ba and 17 measurement items were investigated.
Significant positive correlations were noted between N-S and Ar-Go and between ∠N-S-Ba and Ptm-ANS／NF, suggesting that the mandibular ramus height increases as the length of the anterior cranial base [N-S] increases, and the anteroposterior diameter of the maxilla increases as the basal angle increases.
In the present study, significant positive correlations were noted between N-S and Ar-Go and between ∠N-S-Ba and Ptm and –ANS/NF, clarifying that the anteroposterior diameter and basal angle of the skull base influence the maxillofacial morphology based on the specific measurement items.
Noboru Demura, Miho Hasumoto and Taichi Demura
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