The History of Articulators: The Contributions of Rudolph L. Hanau and his Company—Part I

Engelmeier, Robert L.; Belles, Donald M.; Starcke, Edgar N.

doi:10.1111/j.1532-849x.2010.00578.x

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…That would suggest a step backward to an average value instrument. [ 5 ] 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 through further research.…”

Section: Discussionmentioning

confidence: 99%

“…According to Beu, Jack Stern (1960) stated that the Hanau's formula was never considered to be exact; rather it was an approximate starting point. Sir Rudolph Hanau developed the formula as “a security blanket.”[ 5 ] Javid and Porter found a significant difference in the means of the condylar readings using lateral interocclusal record and the Hanau's formula. [ 1 ] Knap and Ziebert suggested a technique in oral reconstruction using the Hanau Model 130-28.…”

Section: Introductionmentioning

confidence: 99%

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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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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…The lateral condylar angle (Bennett angle) for each patient was calculated using the Hanau formula: L (lateral adjustment) =H (horizontal adjustment)/8+12 (24) (Figs. 4a & b).…”

Section: Bennett Angle Measurementmentioning

confidence: 99%

A Comparison between the Horizontal Condylar and Bennett Angles of Iraqi Full Mouth Rehabilitation Patients by Using Two Different Articulator Systems : An In-Vivo Study

Zakaria¹

2016

JBCD

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Background: Errors of horizontal condylar inclinations and Bennett angles had largely affected the articulation of teeth and the pathways of cusps. The aim of this study was to estimate and compare between the horizontal condylar (protrusive) angles and Bennett angles of full mouth rehabilitation patients using two different articulator systems. Materials and Methods: Protrusive angles and Bennett angles of 50 adult males and females Iraqi TMD-free full mouth rehabilitation patients were estimated by using two different articulator systems. Arbitrary hinge axis location followed by protrusive angles and Bennett angles, estimation was done by a semiadjustable articulator system. A fully adjustable articulator system was utilized to locate the terminal hinge axis using a kinematic face bow followed by protrusive angles location by the aid of two square shaped transparent hard plastic protractors attached close to the condylar stylus of the articulator followed by Bennett angles calculation according to the Hanau formula. All results were subjected to statistical analyses. Results: The two articulator systems scored protrusive angles for male patients greater than female patients which were non-significant for the fully adjustable articulator but they were significant for the semiadjustable articulator. Non-significance existed between females of the fully adjustable articulator and males of the semiadjustable articulator while high significance was located between males of the fully adjustable articulator and females of the semiadjustable articulator. Concerning Bennett angles, the highest mean value belonged to the male group of the fully adjustable articulator, while the lowest scored by the female group of the semiadjustable articulator. Highly significant differences were located between the Bennett angle mean values of the groups. Conclusion: Using both articulators, the total mean values of the males were greater than the females regarding both horizontal condylar angles and Bennett angles with the total means scored by the fully adjustable articulator being larger than those of the semi-adjustable type. Using both articulators, the males' right and left condyles exhibited greater Bennett angles than their female equivalents. The precision estimation of the horizontal condylar angles and Bennett angles provided by the condylar axis protractors of the fully adjustable articulator render such type of articulators most suitable for treating full mouth rehabilitation cases.

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“…Three months after his death, his last paper explaining his concept of “Resilient and Like Effect” (REALEFF) was presented at the Chicago Midwinter Meeting by Dr. Walter H. Wright . During his impressive 9‐year career in dentistry, Hanau designed and manufactured many articulators and made prolific contributions to the dental literature . After his death, management of his company was passed to Hanau's partner, Jacob L. Stern.…”

mentioning

confidence: 99%