horizontal jaw relations ppt
TRANSCRIPT
Horizontal jaw relations
Preeti KaliaIst year PG student
Department of Prosthodontics A.E.C.S Maaruti Dental College
Horizontal jaw relation
Definition
Theories of centric relation
Techniques
Physiologic
Functional GraphicOther
Eccentric relation records
Definition GPT 1’ defines centric relation as “The most
retruded relation of the mandible to the maxillae when the condyles are in the most posterior unstrained position in the glenoid fossae from which lateral movement can be made, at any given degree of jaw separation.”
Definition GPT 8 is “The maxillomandibular relationship in which the
condyles articulate with the thinnest avascular portion of their respective discs with the complex in the anterior superior position against the slopes of the articular eminences. This position is independent of tooth contact. This position is clinically discernible when the mandible is directed superior and anteriorly. It is restricted to a purely rotary movement about the transverse horizontal axis”
Centric relationAnatomical
S. Davies and R. M. J. Gray, What is occlusion? British Dental Journal, Vol 191, No. 5, September 2001
Centric relationConceptual
S. Davies and R. M. J. Gray, What is occlusion? British Dental Journal, Vol 191, No. 5, September 2001
Centric relationGeometrical
S. Davies and R. M. J. Gray, What is occlusion? British Dental Journal, Vol 191, No. 5, September 2001
Theories of centric relation
Muscle theory
Theories of centric relation
The ligament theory
Theories of centric relation
Osteofibre theory
Theories of centric relation
Meniscus theory
Centric relation
Techniques
According to John.J.Sharry
Checkbites
Excursive recordings
Deglutition
Terminal hinge axis
Techniques
Techniques
Physiological
Tactile
Pressureless
Pressure
Functional
Needlehouse
Patterson
GraphicIntraoral
Extraoral
TechniquesPhysiological method
Indications
Flabby tissue
Physiological method
Materials used
Aluwax Aluwax Aluwax
Aluwax
Physiological method
Tactile sense or interocclusal record method
It involves 2 steps.
First a tentative centric jaw relation is recorded using wax occlusal rims.
In the second step an interocclusal check record is made using the trial denture during try-in
Physiological method
Pressure less method
Physiological method
Nick and notch method
Physiological method
Pressure method
The lower occlusal rim is fabricated to be of excess height
occlusal rim is softened in a water bath and inserted carefully into the patient’s mouth
patient is guided to close his mouth in centric relation
Physiological method
Staple pin method
Functional or chew-in method
Needle house method
Functional or Chew-in-method
Patterson’s technique
Graphic methods
Intraoral tracing device
Graphic methods
Graphic methodsExtaoral tracing device
Graphic methodsExtaoral tracing device
Graphic method
Indications
Well healed broad edentulous ridges.
Adequate interarch space
Graphic methodContraindications
Severely resorbed ridges
Excessively flabby ridges
Instability of denture bases
Decreased arch space
In patients with temporomandibular joint disorders
In patients with abnormal jaw relation
Classification of Gothic arch tracings
Greber 19661) Classical pointed form
2) Classical flat form
3) Asymmetrical form
4) Miniature tracing
5) Vertical line protrudes beyond the arrow point
Pantographic tracing
Other methods of recording centric relation
Swallowing
Chin point guidance
Chin point guidance with anterior jig
Bilateral manipulation
Martin E. Kantor, Sidney I. Silverman and Lawrence Garfinkel ,Centric-relation recording techniques-a comparative investigation,J Prosthet Dent 1972:28;6,593-600
Swallowing
Chin point guidance
Chin point guidance with anterior jig
Bilateral manipulation
Protrusive interocclusal record
Whip mix
Protrusive interocclusal record
Hanau
Protrusive interocclusal record
Hanau
Lateral interocclusal records
Whip mix Set side shift guide at 45o.
6mm from centric relation along LL.
Right condyle is in protrusion.
Lateral interocclusal records
Hanau
Factors contributing to inaccuracy of eccenrtric records Unstability of records
Resiliency and displaceability of denture bearing tissues
Materials used in record making
Equipment used in record making
Lack of muscle coordination by the patient
Use of articulators not adjusting to all introcclusal check records
Clinical protocol
Clinical protocol
Clinical protocol
Centric relation versus centric occlusion
Review of literature
Ansari.I.H, A one appointment complete denture impression and centric relation record method for compromised complete denture patients, J Prosthet. Dent,December, 1997:78;320-323
Review of literature
Ansari.I.H, A one appointment complete denture impression and centric relation record method for compromised complete denture patients, J Prosthet. Dent,December, 1997:78;320-323
Review of literature
Bissasu.M, Use of the tongue for recording centric relation for edentulous patients, J Prosthet Dent 1999;82:369-70
References Sheldon Winkler,Essentials of Complete
Denture Prosthodontics,2nd edition,A.I.B.T.S publishers and distributors, India, pp-183-201
John.J.Sharry, Complete denture prosthodontics, 3rd edition, Mcgraw-Hill book company,USA, pp-215-222
Charles.L.Bolender,Prosthodontic treatment for edentulous patients,12th edition,2003,Mosby publications,St.Louis,pp-268-297
A.O Rahn and C.M Heartwell,Textbook of complete dentures,4th edition,1993,Lea and Fabiger,USA,pp-290-308
References
Deepak Nallaswamy,Textbook of Prosthodontics, Ist edition,2003,Jaypee publishers,New Delhi,pp-108-151
A.O Rahn and C.M Heartwell,Textbook of complete dentures,4th edition,1993,Lea and Fabiger,USA,pp-290-308
Granger.E.R. Centric relation, J Prosthet Dent
1953:2;2 pp:160-177 Cohen.R, Hinge axis and its practical
application in the determination of centric relation,Jprosthet Dent 1960:20;2 pp:248-257
References Martin E. Kantor, Sidney I. Silverman and Lawrence Garfinkel Centric- relation recording techniques-a comparative investigation,J Prosthet Dent 1972:28;6,59
James Hart long, An instrument for locating centric relation ,J Prosthet Dent 1973:30;1,50-52
William E. Avant , Using the term “centric”, J Prosthet Dent 1971:25;1,pp:12-15
References
Lawrence A. Weinberg, Temporomandibular joint function and its on centric relation,J Prosthet Dent 1973:30;2,176-195
Ansari.I.H, A one appointment complete denture impression and centric relation record method for compromised complete denture patients, J Prosthet. Dent,December, 1997:78;320-323
Bissasu.M, Use of the tongue for recording centric relation for edentulous patients, J Prosthet Dent 1999;82:369-70.
References S. Davies and R. M. J. Gray, What is
occlusion? British Dental Journal, Vol 191, No. 5, September 2001,
Thomas E.J. Shanahan, Physiologic vertical dimension and centric relation ,J Prosthet Dent 2004: 91;3,203-209
13) Yoshiyuki Watanabe,Observation of horizontal mandibular positions in an edentulous patient using a digital gothic arch tracer:A clinical report,J Prosthet Dent 2004 :91;1,15-19
References
www.doctorspiller.com