Background/Purpose: The aim of this study was to compare the horizontal condylar guidance angulation (HCGA) values obtained by using interocclusal wax record, cone beam computed tomography (CBCT) and Gothic arch tracing method in edentulous patients. Materials and Method: A total of 15 (n==15) completely edentulous patients were selected for this study according to inclusion and exclusion criteria. Horizontal condylar guidance angulation (HCGA) was recorded for each patient by three methods: interocclusal wax record method, cone beam computerized tomography (CBCT) and Gothic arch tracing. Statistical analysis of comparison amongst three methods was evaluated by Student t-test and Two- way ANOVA at a significance level of 0.001 (p value < 0.001 significant). Results: The mean difference of HCGA on right and left side from interocclusal wax record method was 26.80º±2.14º and 27.00º±2.13º respectively. The mean difference of HCGA on right and left side from CBCT method was 33.09º±4.65º and 33.81º±3.45º respectively. The mean difference of HCGA on right and left side from Gothic arch tracing method was 31.13º±2.90º and 31.10º±2.50º respectively. Conclusions: There was significant difference in the values of HCGA when measured by 3 methods. Highest value of HCGA was obtained by CBCT method and lowest value was obtained by Interocclusal wax record method. On comparison of right and left horizontal condylar guidance angulation by these methods individually, no significant difference was found between right and left sides.
