A surveyor is a simple instrument consisting of a vertical spindle which Is perpendicular to the platform or base. the lower end of the spindle a chucking device for attaching different instruments. A movable table with a tilting top permits a cast to be mounted and moved in any direction on the base of the surveyor.
An inlay is a dental restoration that fits within a prepared cavity in a tooth and is secured by retention form and sealed by cement. Any type of replacement for a missing tooth or part of a tooth that is cemented and fixed in position in such a manner that cannot be removed by the patient is a fixed dental prosthesis. clinically，the patient treatment procedures for inlay restorations for inlay restorations are a part of operative dentistry.