這是schwartz applaince裝置,顯示出各clasp的位置,以經驗而言,要讓adams clasp固位好一點的話,可以在印模前先以separators分牙,讓大臼齒的鄰接面可以有較大的接觸面積,自然clasp入位的效果就會更好,自然固位效果就會較好,擴大器的穩定性高,起到的撐開作用就會更好

這是用在咬合墊(板)上的球形卡環(ball clasp),球形卡環的固位效果較佳,若是變形時較容易調整,就位也方便,所以用在鄰接面的固位效果佳

這是c形卡環(C代表著circumferential,環繞的意思),C clasp普通儘量不要用在大臼齒上,這是舉例的情形,因為c clasp用在大臼齒的固位效果較不好,鬆鬆的,病人戴用時常會跳起來,不穩定,而且常常會變形,必須經常回診調整緊度,所以使用上要注意!
Adams clasp ~A circumferential retention clasp (see crib) designed by C. Philip Adams to stabilize removable appliances by means of point contact with the mesio- and
disto-buccal undercuts of individual buccal teeth. (這是adams clasp的字義)

adams clasp forming plier

Adams Clasps Our Adams Clasps have been updated for removable appliances. We have redesigned the interproximal angle, its malleability, and its radii for quick adaption. Available in eight widths. Packs of 100.
Size	Catalog Number
5mm 6mm 7mm 8mm 9mm 10mm 11mm 12mm	97-555-05 97-555-06 97-555-07 97-555-08 97-555-09 97-555-10 97-555-11 97-555-12