Quantitative Study on Inclination of Anterior Guidance

  • Takeuchi Hisahiro
    Department of Fixed Prosthodontics, Tokushima University Hospital
  • Nakano Masanori
    Department of Functional Oral Care and Welfare, Institute of Health Biosciences, The University of Tokushima

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  • 側方ガイド傾斜角についての定量的検討

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Abstract

Purpose: The purpose of this research was to establish the standard value of the inclination of anterior guidance during lateral excursion.<br>Methods: Previously reported excursion data (29 males; 9 females; age, 23.31 years) were re-analyzed. The standardized rotation angle around the kinematic axis defined as the rotation angle around the kinematic axis per unit displacement (1 mm) of the incisal point during excursion was calculated. Moreover, the difference of inclination between incisal and condylar paths was calculated. Then, the relation between the standardized rotation angle of the kinematic axis and the difference of inclination between incisal and condylar paths was analyzed statistically (SPSS15.0J, SPSS Inc.).<br>Results: First, the correlation coefficient between the standardized rotation angle of the kinematic axis and the difference between the actual inclinations of the incisal path and the balancing side condylar path during lateral excursion was r = 0.84 (P < 0.001, Pearson's correlation coefficient). The relation between the inclination of the incisal path and the balancing side condylar path was as follows: inclination of incisal path = inclination of balancing side condylar path –5° ± 9.5° (reference: Camper plane). Second, computer simulation revealed that the standard value of inclination of anterior guidance during lateral excursion could be achieved with the following articulator settings: Sagittal incisal table angle = inclination of balancing side condylar path +5°; lateral incisal table angle = 15° ± 13°.<br>Conclusion: The standard value of inclination of anterior guidance during lateral excursion and the settings of articulator for it were clarified.

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