The application relates to the technical field of
oral cavity expansion, in particular to an expansion device for
oral cavity treatment, which comprises an expansion
forceps, a self-adaptive supporting mechanism and an expansion maintaining
assembly. The expansion
forceps is opened by applying force to the
forceps body, so that the forceps body is in contact with the mouth and the expansion of the mouth is realized. The self-adaptive supporting mechanism is installed on one side of the bottom of the expansion forceps. When the self-adaptive supporting mechanism is pressed, the supporting mechanism can be supported on the
cheek area of the mouth. When the expansion forceps is expanded by applying force, the expansion maintaining
assembly is locked by a one-way locking structure, so that the expansion forceps cannot be restored due to the force applied by the mouth after being opened. The operation is convenient, and the hands of the doctor are freed. The supporting feet of the self-adaptive supporting mechanism can automatically adhere to the
cheek area of the patient and be locked and positioned by gravity self-falling design, so that the doctor does not need to continuously hold and fix. The one-way locking structure of the expansion maintaining
assembly is matched, so that the opening state can be stably maintained after expansion without continuously applying a pushing force, the doctor can focus on the treatment operation, and the diagnosis and treatment efficiency is remarkably improved.