The oral cavity propping instrument consists of a crablike front teeth sustainer and a wedged rear teeth sustainer and is suitable for the operation and treatment of oral internal medicine, oral surgery and orthopaedic surgery. This instrument has a saliva sucking duct which may be connected with a saliva sucker to suck saliva and to resist moisture. It conforms to the shape and structure of human body's oral cavity and can completely separate the tongue from lips and checks to prevent the tissues of tongue and cheeks from damage. It enlarges the range of operation and makes the view field clearer. As an indispensable propping instrument to enhance the cohesive strength of binder and to prolong the service life of filled tooth, it is especially suitable to the case of filling a tooth and makes the solidification of light-sensitive resin in oral cavity more convenient. |