J Adv Prosthodont.  2017 Aug;9(4):302-307. 10.4047/jap.2017.9.4.302.

Correlation between sagittal condylar guidance angles obtained using radiographic and protrusive occlusal record methods

• Kwon OK
• Yang SW
• Kim JH

• KMID: 2398078
• DOI: http://doi.org/10.4047/jap.2017.9.4.302

Abstract

PURPOSE
This study compared the SCGAs measured in three types of radiographic images (panoramic, CBCT panoramic-section, and CBCT cross-section images) with values measured using the protrusive occlusal record.
MATERIALS AND METHODS
SCGAs were measured in 20 patients on a semi-adjustable articulator using the protrusive interocclusal record. Panoramic and CBCT images were obtained. SCGAs were measured on CBCT images in panoramic and cross sections. In all of the radiographic images, SCGAs were measured using the Frankfort horizontal reference line and the mean curvature line. The most-superior and most-inferior points of the curvatures were identified to determine the mean curvature line. Each measurement was performed twice by two operators independently. The data were analyzed by the t-test, Pearson's correlation test, and Cronbach's α using SPSS (α=.05).
RESULTS
The mean right and left SCGAs were as follows: protrusive occlusal record (30.1 and 30.2 degrees, respectively), panoramic (38.9 and 38.7 degrees), CBCT panoramic sections (35.4 and 36.8 degrees), and CBCT cross sections (35.3 and 36.1 degrees). The SCGAs differed significantly among the groups. The Pearson coefficients for the correlations with the protrusive occlusal record measurements on the left and right sides were as follows: panoramic (0.834 and 0.791, respectively), CBCT panoramic-section (0.918 and 0.837), and CBCT cross-section (0.918 and 0.845) images.
CONCLUSION
Strong correlations were found between SCGAs obtained using radiographic images and the protrusive occlusal record.

Keyword

Condylar guidance; Protrusive occlusal record; Radiographic method

MeSH Terms

Dental Articulators
Humans
Methods*

Figure

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  Fig. 1 Aluwax record placed on an articulator at 6 mm of protrusion. (A) Protrusive occlusal record, (B) The Protrusive occlusal record on an articulator.

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  Fig. 2 Measuring the SCGA in a radiographic tracing image. Line A: Frankfort line (Or - P), Line B: Most-superior and most-inferior points of the curvature, Or: Orbitale, P: Porion, Con: Condyle, Angle C: Angle made by the intersection of lines A and B.

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  Fig. 3 Measuring the SCGA in panoramic images. Line A: Frankfort line (Or - P), Line B: Most-superior and most-inferior points of the curvature, Angle C: Angle made by the intersection of lines A and B.

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  Fig. 4 Determining the CBCT panoramic section in an axial view.

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  Fig. 5 Measuring the SCGA in a CBCT panoramic section image. Line A: Frankfort line (Or - P), Line B: Most-superior and most-inferior points of the curvature, Angle C: Angle made by the intersection of lines A and B.

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  Fig. 6 Determining the CBCT cross section in an axial view.

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  Fig. 7 Measuring the SCGA in a CBCT cross section image. (A) CBCT cross - section image (right), (B) CBCT cross - section image (left). Line A: Frankfort line (Or - P), Line B: Most-superior and most-inferior points of the curvature, Angle C: Angle made by the intersection of lines A and B.

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