Objectives:The purpose of this study was to examine the effects to characteristics of canine movement on working side and condylar movement of changes in anterior guidance. Methods:The subjects consisted of 30 persons(mean age of 25.1 years) with normal dental arches and group function occlusion. The informed consent under the Declaration of Helsinki was made with all subjects. To adjust the anterior guidance, metal guides with inclinations of 10 and 20 degree acuter than the inherent inclination were prepared and applied to the maxillary canine. The lateral sliding movement was measured and analyzed at the canine cuspal point and condylar point on the working and non-working sides by using a six-degree of freedom jaw movement measurement system. Results:Change of the anterior guidance was found to produce various movement patterns on the working side cuspal point at the anterior-posterior side in the subjects. However, the cuspal point moved to lateral-inferior side. There was no observable rule for locus or direction on account of the guide. Conversely, movement of the working side condylar points with the guide altered the direction to the anterior-inferior side on all subjects at inclination of 20 degree and the distance was significantly extended by Wilcoxon test(P<0.01). There was no change in the case of the non-working condylar points. Conclusions:The results showed that acute change of anterior guidance made a functional disorder on working side condyle for the mandibular movement. It was necessary to consider the acute change of inherent guide.

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