Abstract:

Objective　The purpose of this study was to compare the differences of craniofacial characteristics of adult high-angle and low-angle facial skeletal types.Methods　The subjects consisted of 37 yellowrace adults (17 high-angle, 20 low- angle). Fifty-three items of cephlometic radiographs were analyzed.Results　The angle of N-S-Ar and N-S-Ba, the distance of Ptm-A, Co-Go, Po-NB, and S-Go, and the thickness of the mandibular symphysis in high-angle groupwere smaller than these in low-angle group. The angles of SN-OP, FH-OP, PP-OP, SN-MP,FH-MP,PP-MP, S-Ar-Go, mandibular angle(Ar-Go-Me), Y- angle, and SUM, the distance of S-Co, N-Me, and ANS-Me in high-angle groupwere greater than these in low-angle group. The index of FHI, N-ANS/N-Me, and N-ANS/ANS-Me were smaller, and ANS-Me/N-Me larger in high-angle group. Although the means of Go-Po and FH-RPwere smaller in high angle group, but no statistical differencewere found.Conclusion　The craniofa- cial morphology of adult high-angle and low-angle facial skeletal types demonstrated significant differences, especially in lower fa- cial form.

Key words: adult, facial type, cephlometic