| 摘要 |
This holder is characterized by a device with a double ball-and-socket joint mounted on the forward part of its holder and comprising a dual locking lever for simultaneously locking its two ball joints or selectively locking its rear ball joint, and by the use of retaining rings imbedded in the rear part of the dental bridge castings which insure their fastening on the base of the holder and on a connecting stud joined to the rear swivel joint of this holder. Used to study the articulation between dentures connected to the castings.
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