Bennett angle

The Bennett angle is the angle measured in the horizontal plane between the sagittal protrusion path and the mediotrusion path of the condyle . In contrast to the Bennett movement, the Bennett angle is therefore on the balance side. Its mean value is 15–20 °, that of the inclination of the condylar path is 30 °. Both are measured variables for jaw movements. The Bennett angle describes the extent of a lower jaw movement caused by the lateral displacement of the lower jaw ( mandible ) against the upper jaw (maxilla). It is created by projecting two straight lines onto the Frankfurt horizontal . The measured variable is required in the manufacture of dentures in an articulator .

designation

The Bennett angle is named after the British oral surgeon Sir Norman Godfrey Bennett (1870–1947), who in 1908 described the lateral movements of the lower jaw.

Bennett Movement

The condyle of the so-called working side experiences an immediate, non-progressive lateral displacement. This movement is known as the Bennett movement. The condyle rotates with a slight lateral shift in the direction of movement. As a rule, the Bennett movement of the mediotrusion condyle is synchronous with the Bennett movement of the working condyle. However, the mediotrusion condyle may also shift immediately to the side before it moves forward. Then one speaks of an immediate side shift . If the Bennett movement of the mediotrusion condyle occurs mainly at the beginning of the forward movement, it is an early side shift and if the Bennett movement is evenly distributed over the first 4 mm of the forward movement, it is called a distributed side shift .

Individual evidence

↑ ^a ^b Bernd Reitemeier: Introduction to dentistry . Georg Thieme Verlag, 2006, ISBN 978-3-13-139191-9 , p. 101.
^ Norman Godfrey Bennett, A contribution to the study of the movements of the mandible. Proc Roy Soc Med (Lond), 1908; 1: 79-88 (Odont Section)
^ Norman Godfrey Bennett, The science and practice of dental surgery , W. Wood, New York, 1914.
^ Stanley J. Nelson: Wheeler's Dental Anatomy, Physiology and Occlusion - E-Book . Elsevier Health Sciences, June 1, 2009, ISBN 1-4377-2196-6 . , P. 265.

[Reitemeier-1] Bernd Reitemeier: Introduction to dentistry . Georg Thieme Verlag, 2006, ISBN 978-3-13-139191-9 , p. 101.

[2] Norman Godfrey Bennett, A contribution to the study of the movements of the mandible. Proc Roy Soc Med (Lond), 1908; 1: 79-88 (Odont Section)

[3] Norman Godfrey Bennett, The science and practice of dental surgery , W. Wood, New York, 1914.

[4] Stanley J. Nelson: Wheeler's Dental Anatomy, Physiology and Occlusion - E-Book . Elsevier Health Sciences, June 1, 2009, ISBN 1-4377-2196-6 . , P. 265.