NHP showed a satisfactory repeatability, and no statistical differences were found between radiographic measurement of SN-THP and FH-THP respectively in different time (P>0.01).

• 拍摄X线头颅侧位片时自然头位可重复性好 ；SN THP和FH THP前后对比差异皆无统计学意义 (P >0 .；5 ) ;