(5)闭式马蹄形腭杆(或前后带式腭杆). 强度较大,一般在第Ⅰ、Ⅱ类牙列缺损并伴有前牙缺失时选用(图5)。优点:强度较大,虽然上腭有一孔,但仍有较好的支持作用,它与前后腭杆不同,其前部覆盖在腭皱襞上,金属的皱纹增加了强度,并且由于呈圈形也提供了L形梁的作用。缺点:虽然腭皱襞上的金属可以薄一些,但仍能影响发音和有异物感。 (5) closed horseshoe-shaped palatal rod (or before and after the belt palatal rod.) Greater strength, generally in the I, II dentition defect accompanied by missing anterior teeth (Figure 5). Advantages: greater strength, although there is a hole in the palate, but there is still a good supporting role, which is different from the front and rear palatal, the front covered in the palate fold, the metal wrinkles increased strength, Provides the role of L-shaped beam. Disadvantages: Although the metal on the palate fold can be thin, but still can affect the pronunciation and foreign body sensation.