ABSTRACT
The discrepancy between centric relation and centric occlusion have a great role on the
successful prosthodontic and occlusal treatment.
This study was performed to investigate the effect of the discrepancy between centric relation
and centric occlusion on condylar guidance inclination and Bennett shift (immediate and progres-
sive side shift).
Sixteen adults who have physiologically normal occlusion and are free of TMJ dysfunction
were selected. The amount of the sagittal CR-CO discrepancy in lower anterior incisor was ob-
tained by Saphon Visi-Trainer. The amount of the CR-CO discrepancy in condylar level was
measure.d on the individualized corrected tomography. Pantronic survey was performed by using
a arbitrary hinge axis according to manufacturer´s direction.
All subjects were divided into two groups, group I (small) and group II (large), according to
the amount of CR-CO discrepancy.
At first the amount of the CR-CO discrepancy in condylar level between two gro was
compared and then the condylar guidance inclination and Bennett shift be" "si-i two grou -^ were
compared and analyzed.
The results were as follows;
1. The average CR-CO discrepancy in lower anterior incisors was 0./´in;r: ? . i.,
0.49mm anteroposteriorly, and 0.88mm in total. The average CR-CO di
lar level was 0.43mm.
2. The CR-CO discrepancy measured on teeth level and condylar level were highly correlate d
(p<0.01).
3. The correlation of the condylar position in the glenoid fossa between two groups was not
statistically significant.
4. The large CR-CO discrepancy group showed greater amount of Bennett shift ?-nd >,,
guidance inclination, but there is no statistical significancy.
5. It seems that the CR-CO discrepancy have greater effect on progressive side shift than ol""r
elements of mandibular movements.
Keywords: centric occlusion, centric relation, immediate side stuti. ´"ressiv
orbiting condylar inclination, protrusive condylar inclmatio:i.
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