Results: The lateral wall length of the trilateral foramen was (. ±.8)mm,upper wall length was (.±.)mm,lower wall length was (.7±.)mm.
Results: The lateral wall length of the trilateral foramen was (. ±.8)mm,upper wall length was (.±.)mm,lower wall length was (.7±.)mm.
果:三边孔外侧壁长(.±.8)mm,上壁长(.±.)mm,,下壁长(.7±.)mm。