Abstract
The guided inclinations and the locations on the functional occlusal surface of the natural dentitions, regarding angle class I molar relationship, were studied on 20 mounted casts on the SAM2 articulator that were adjusted by condylar path. Twenty subjects also underwent computerized axiography to obtain the condylar path (Sagittal condylar inclination and Bennett angle) . The lower each tooth of all lower casts were provided with pin to remove the die from the cast. The die that was guided firstly was marked and removed from the cast. This procedure was repeated until last guided die was marked.All measurements of the guidable inclinations were made using a 3D-digitizer (MicroScribe-3D) and were referenced to the axis-orbital plane. The guided locations on the teeth were marked on the occlusal map. The values of the guided inclination from canine to 2nd molar ranged from 42.8 to 18.7 degrees on the left side and from 40.0 to 20.1 degrees on the right side, indicated a sequential guidanced occlusion with canine dominance.
There is a significance in the value of guided inclination between neighboring teeth, except for the value between 2nd premolar and 1st molar. High frequency of the guided location on the functional surface observed medial lingual or buccal part, except for 1st molar. This result was caused by the crown angulation of medial lotation of the distal cusp in the upper first molar. This study indicated the principle of occlusion that is provided with natural dentitions, regarding class I molar relationship.
