Comparison of the Arcon and the Condylar type articulators on the reproduction of lateral movements

Part III. Articulator adjustment for the lateral movements

抄録

It is supposed that on the reproduction of lateral movements, the articulator settings of the Condylar type articulator is different from the condylar pathways of the human jaw. The Arcon type articulator shows the same values as the human jaw. It is not clear, however, about the differences of the articulator settings between the Arcon and the Condylar type articulator. In the present study, the angular differences on each adjustable mechanism are analyzed by reproducing the same lateral movement on the Arcon type articulator; which has all guiding systems on the upper member, and the Condylar type articulator; which has all guiding systems on the lower member. The lateral movement is reproduced on the Arcon type using the mandibular movement cubic model three-dimensionally. The lateral movement of the Condylar type is reproduced by calculating the intercuspal position of the Arcon type relative to the lateral occulusal position of the Arcon type. The differences of the articulator settings between both articulators are calculated and compared.
The results are as follows;
The angular differences of the articulator settings between the Condylar and the Arcon type articulator are not the same on each adjustable mechanism. The maximal difference of the non-working side condylar guidance is about 4°on the horizontal projective angle and 1°on the sagittal projective angle, while the maximal difference of the working side condylar guidance is about 2°on the horizontal and frontal projective angle. In addition, the changing of the sagittal projective angle on the non-working side condylar guidance affects the articulator settings of the Condylar type articulator. It is necessary to consider the angular differences from the condylar pathways of the human jaw, when evaluating the lateral movement by the Condylar type articulator.