A formula to determine the lateral condylar guidance from intraoral needlepoint tracings

Statement of Problem:The accuracy and reliability of the methods used for programming the semi-adjustable articulators determine the accuracy in occlusion. The current recommended average settings using the Hanau's formula commonly used by clinicians is questionable, and thus reassessment is needed. This study was carried out to evaluate and compare the lateral condylar guidance: (1) Using the Hanau's formula and the computerized jaw tracking device (Kinesiograph). (2) On the right and left sides using both these methods.Materials and Methods:A total of 20 completely edentulous patients (14 male and 6 females) within 40–60 years of age were selected. Jaw relation was recorded followed by face bow transfer. Extraoral Gothic arch tracing was recorded; three protrusive records were obtained and condylar guidance was calculated. Lateral condylar guidance was then calculated using Hanau's formula, followed by the computerized jaw tracking device. A comparative evaluation was done of the obtained values. The same investigator worked with each of the study participants for the purpose of standardization.Results:The lateral condylar guidance values obtained using the Hanau's formula ranged from 14 to 17° while those obtained using the computerized K7 jaw tracking device ranged from 8 to 40°. Bennett angle values, obtained using the jaw tracking device and Hanau's formula showed statistically significant differences (P < 0.05) using paired t-test (at 95% confidence interval). Bennett angle values of the right and left sides found using the Hanau's formula were almost similar. Difference in the Bennett angle values of the right and left sides were found using the jaw tracking device. However, this difference was not statistically significant (P > 0.05).Conclusion:Based on the results, dentist and dental technicians should consider reassessing the current recommended average settings and use of the Hanau's formula for programming the semi-adjustable articulators.

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“…The tan value of the slope gives the angle (∞) which denotes the lateral condylar guidance. [ 7 8 9 ]…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Hanau's formula in determination of lateral condylar guidance: A clinical research study

Bhawsar

Marathe

Ansari

2015

J Indian Prosthodont Soc

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“…Those that are widely applicable in the modern dental practice are the semi-adjustable and fully adjustable articulators. Irrespective of the articulator type, in or-der to perform the accurate reproduction of mandibular movements via the device we should register the individual parametric features of patient's masticatory apparatus, as sagittal condylar pathway, lateral condylar guidance, and horizontal hinge axis's position [1,6,7]. In order to register these parameters, we use diff erent types of facebows [20].…”

Section: Introductionmentioning

confidence: 99%

Computer Program for Digital Data Analysis of Facebow Records – Part І

Pavlova

Tumbalov

Filtchev

2020

Acta Medica Bulgarica

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The purpose of the study is to create computer program for the achievement of precise digital data processing of records performed with the “Facebow Mini-Maxi” and the facilitation of information transfer to the articulator.Material and method: A conceptual project was developed in order to create a new software product and requirements were defined towards its capacities, which are to provide guidance for its creation. With the assistance of computer programmer, the project was implemented.Results: The computer program “Facebow Mini-Maxi Analyzer” for digital data processing of registrants performed with the auricular type facebow was created. The program provides automatic recognition, reading, calibration and measurement of data obtained by “Facebow Mini-Maxi”. The main module gives us opportunities for measuring the values of: the sagittal condylar pathway; the arrow point angle and the length of the hinge axis. After finalizing the calculations, the software automatically generates a scheme with visualization of the parameters that significantly supports the dental technician when it comes to defining the accurate position of the models in dental articulator with individual parameters.Conclusion: The computer program provides accurate analysis of facebow records and assists in determining individual patient movement parameters of the lower jaw. The obtained results from the analysis improve the precision of casts mounting in articulator. The program cuts down the risk of subjective error when analysing the data via manual measurement of the recorded parameters on paper carrier.

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A mathematical model of mandibular protrusion

Katona

1991

The Journal of Prosthetic Dentistry

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A formula to determine the lateral condylar guidance from intraoral needlepoint tracings

Cited by 3 publications

References 5 publications

Evaluation of Hanau's formula in determination of lateral condylar guidance: A clinical research study

Evaluation of Hanau's formula in determination of lateral condylar guidance: A clinical research study

Computer Program for Digital Data Analysis of Facebow Records – Part І

A mathematical model of mandibular protrusion

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