Introduction to Facebow
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The document provides an introduction and history of the facebow, which is a dental instrument used to record the spatial relationship between a patient's upper jaw and mandibular condyles. It describes how early developers like Bonwill, Balkwill, and Hayes created some of the first articulators and facebow-like devices in the 1860s-1880s to better replicate jaw movements. The document outlines the purposes of the facebow, including establishing balanced occlusion in eccentric jaw positions and verifying jaw relationships when restoring multiple teeth. It notes when a facebow is necessary versus unnecessary for certain dental cases and procedures.
Introduction to Facebow
- 1. INTRODUCTION TO FACEBOW Dr Aaryas Vlogs
- 2. INTRODUCTION The upper jaw in the human skull is positioned uniquely to the lower jaw. This position is different for every person. The opening movement to bring the jaw from occlusal to rest position is almost a pure hinge movement. The relation of maxilla to the opening and closing axis has to be determined.
- 3. HISTORY
- 4. BONWILL 1860 the distance from the center of each condyle to the median incisal point and the lower teeth -10cm BALKWILL 1866 apparatus to measure the angle formed by the occlusal plane of the teeth and a plane passing through the lines extending from the condyles to the incisal line of the lower teeth HAYES 1880 functional face bow like device intended for locating the position of the casts correctly in the articulator - articulating caliper
- 5. Bonwill In 1860, Bonwill developed the first articulator with a serious effort to initiate the movements of the mandible in eccentric positions 5
- 7. Francis H Balkwill 1886 Angle formed between the plane of two lines drawn from the articulating surfaces of the condyles to the occlusal plane - estimated to be 26 degrees.
- 8. Richmond Hayes 1889 Fixed descending condylar path - incorporated
- 9. WALKER 1890 CLINOMETER - a new type of instrument used for determining position of the lower cast in relation to the condylar mechanism. Walkers Facial clinometer
- 10. GEORGE K BAGBY 1894 device that determined the distance from the midline of the anterior occlusal rims to one of the condyles GYSI 1895 constructed an instrument for registering the condyle path GEORGE B. SNOW 1899 a device which became prototype for modern face bow
- 11. PURPOSE To record the relationship of the maxillary arch to the horizontal axis of the mandibular condyles
- 12. USES The face bow is used when cusp form teeth are used Balanced occlusion in the eccentric position is desired Inter-occlusal check records are used for verification of jaw positions When the vertical dimension of occlusion is subject to change Balanced occlusion in CD Class I & II cases
- 13. Uses of face bow Open anterior bite or end to end relationship Single restoration on II molar not for premolar and I molar Segmental restoration Anterior restoration – primary guidance Factor in excursive movement Restoration of entire quadrant Diagnostic purposes and treatment planning
- 14. The face bow is not necessary under the following conditions Monoplane teeth No alterations of the occluding surfaces of the teeth No inter-occlusal check records Articulators that are not designed to accept a face bow transfer
- 15. FACEBOW RECORD • Accurate mounting - three points • Criteria for selection of points – Ease of location – Convenience – Reproducibility
- 16. PLANES AND FACEBOW • Facebow captures the relationship between occlusal plane and the horizontal reference.
- 17. PLANE OF ORIENTATION The spatial plane formed by joining the anterior and posterior reference points. • The horizontal plane is established on the face of the patient by 1 anterior & 2 posterior points.