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I measured the movement range on the hinge articulator and the movement range in an oral. Andthen I studied to analyze the gap. I got wax records by the movement on the hinge articulator, themovement in an oral and the movement on the hand articulating. I measured the distance of thecusp tips that are close to the mesial direction and the distal direction, the buccal direction and thelingual direction then I compared gaps.As I saw results on data, I knew that the hinge articulator represented the range of mandibularmovement restrictively. I could find the decisive contradiction that the sliding movement finishedon the hinge articulator although it did not finish in an oral. If the sliding movement does notreappear exactly, it brings a fatal failure to the dental prosthesis. In addition it is impossible that thehinge articulator restores the movement in an oral because the lateral condyle inclination and thehorizontal condyle inclination are fixed previously. Therefore dental prosthesisses were made bythe hinge articulator, they will interfere with a mastication.I have obtained the following results;1. The distance of sliding movement on the hinge articulator showed shorter than the distance ofsliding movement in oral. This means the increase of cusp inclination of the dental prosthesis thatwas made on the hinge articulator. Therefore, when the lateral movement occurs in oral, there is apossibility to become the premature as the increase of cusp inclination. 2. The results that were impressed records in oral and impressed records on the hand articulatinghave many congruities. I think that the simple crown etc. that were made by the hand articulatingmethod except the long span bridge and the free end case that can not measure the verticaldimension exactly can represent similarly the mandibular movement.3. If we want to represent the mandibular movement similarly, we have to use the articulator thatcan adjust the horizontal condyle inclination and the lateral condyle inclination at least.