Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Jaw movements and articulators - King George`s Medical University
Document related concepts
Transcript
Dr Balendra pratap singh BDS, MDS, MAMS, FISDR, FPFA, FAAMP, ICMR-IF Assistant Professor Department of Prosthodontics King George’s Medical University, Lucknow Posselt’s Figure MP ICP RCP HA MP = Maximal protrusion ICP = Intercuspal position RCP= Retruded Contact position HA = Hinge axis MO = Maximum opening MO Posselt’s Figure – top edge MP ICP IG RCP EE Articulators A mechanical representation of the jaws and temporo-mandibular joints Diagnosis • slides and occlusal relationships Treatment planning • • Diagnostic wax - up Occlusal adjustment Fabrication of Splint / Prostheses Types Simple Hinge Average Value Semi-adjustable Fully adjustable BONWILL 1854 4” 4” Average Value 4” 4” Average Value Non Arcon Adjustable Condylar Angle, ISS & PSS Semi-adjustable Can alter; •TMJ to Incisor distance •Bennett Angle •Condylor Guidance Angle •Incisal guidance plate •Needs Facebow recording •Ideally should be used for complete denture cases For semi adjustable articulator Posterior wall Superior wall Medial wall Inclination of superior wall Condylar angle Intercondylar (& glenoid fossa) distance ISS Articulator Patient Therefore the distance from the condyle to the teeth is crucial We obtain a measurement of this distance with a facebow Bimanual manipulation Cotton wool rolls Anterior “jig” Splint therapy Chin-point guidance Cold-cure acrylic (Duralay/Trim) Greenstick From Howatt, Capp & Barrett Condylar angle at saggittal plan30 and lateral guidance 15 ° Immediate side shift 0.3mm Progressive side shift 6° Allows shape of palatal to be reproduced Allows length of incisors to be maintained Tooth to be prepped Shape created is the inverse of Posselt’s figure Following tooth prep Tooth form reconstructed The choice of articulator depends upon such factors as; Intended use Availability of equipment Patient's occlusion - Skill of the technician - Expense - Skill of the operator The more closely the articulator matches the patients anatomy, usually the better the outcome and the less adjustment is required at chairside on fitting prostheses. No articulator is best and no one can record all jaw movements Articulator can try to record only jaw movements not reproduced anatomy of joint.
