J Adv Prosthodont.  2012 Aug;4(3):153-157. 10.4047/jap.2012.4.3.153.

A comparative study to measure the condylar guidance by the radiographic and clinical methods

• Shreshta P
• Jain V
• Bhalla A
• Pruthi G

• KMID: 2176410
• DOI: http://doi.org/10.4047/jap.2012.4.3.153

Abstract

PURPOSE
The study was conducted to compare the radiographic and clinical methods of measuring the horizontal condylar guidance (HCG) values.
MATERIALS AND METHODS
The condylar guidance was measured using the radiographic (CT scan) and three clinical methods i.e. the wax protrusive records, Lucia jig record and intraoral central bearing device in 12 patients aged between 20-40 years irrespective of sex. The records were taken and transferred on the semi-adjustable articulator to record the HCG values. The CT scan was taken for 3D reconstruction of the mid facial region. Frankfort horizontal plane (FHP) and a line extending from the superior anterior most point on the glenoid fossa to the most convex point on the apex of articular eminence (AE) was marked on the CT scan. An angle between these two lines was measured on both right and left sides to obtain condylar inclination angle. Three interocclusal protrusive wax and jig records were taken and transferred to the semi adjustable articulator. Three readings were recorded on each side. Similarly the records were taken and transferred to the same articulator using the intra oral central bearing device to record the readings.
RESULTS
The statistical analysis showed insignificant differences in the HCG values between the right and left sides [(P=.589 (CT), P=.928 (wax), P=.625 (jig), P=.886 (tracer)]. The clinical methods provided low Pearsons correlation values [(R = 0.423 (wax), R = 0.354 (jig), R = 0.265 (tracer)] for the right as well as the left sides when compared with the CT values. Among the clinical methods, jig and wax method showed strong level of association which is statistically significant while the intra-oral tracer showed weak association with the other two methods.
CONCLUSION
The right and left HCG values were almost similar. The CT scan showed higher HCG values than the clinical methods and among the clinical methods, values obtained from all the methods were comparable.

Keyword

Centric relation record; Interocclusal wax records; Intraoral tracing method; Lucia jig

MeSH Terms

Aged
Dental Articulators
Humans
Reading
Ursidae

Figure

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  Fig. 1 Radiographic method to measure horizontal condylar guidance.

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  Fig. 2 Interocclusal protrusive wax record method.

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  Fig. 3 Anterior jig method.

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  Fig. 4 A: Intraoral tracers attached to the maxillary and mandibular cast, B: Arrow point tracing, C: Protrusive record transferred to the articulator.

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  Fig. 5 Comparison of the CGA values obtained from different methods (X-axis-Method, Y- axis- Condylar guidance angles, CT-Computed Tomography, CGA- Condylar guidance angle, J-Jig, T-Tracer, W-Wax, R-Right, L-Left, -CT, -Clinical methods).

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  Fig. 6 Histogram showing comparison between right and left CGA obtained from different methods (X-axis-Method, Y- axis- Condylar guidance angles).

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