This method -time proved - equally in accuracy to any other method.
Occlusal rims used -reduced in height -occlusal contact –VD.
A single stop -terminal position .
Quick setting impression plaster, bite registration paste, autopolymerising resin may be used.
(D) JAW RELATION RECORD MADE ENTIRELY ON OCCLUSION RIMS
When an opposing maxillary complete denture is to be made concurrently with a mandibular removable partial denture.
Used in those rare situation in which the few remaining teeth do not occlude and will not influence eccentric jaw movements.
Anterior teeth present.
Jaw relation records - occlusal rims.
The occlusion rims -supported - accurate jaw relation record base.
Method for recording jaw relation –CD.
Direct inter occlusal method -stylus tracing.
(5) Establishing Occlusion by the recording of occlusal pathway:
5 th method-occlusal pathway -occluding template.
Static jaw relation record used with or without eccentric articulatory movements teeth arranged to occlude -occlusion.
Movement made more complicated -natural teeth.
Schyler -first ant tooth and incisal guidance-oral rehabilitation
According to Thompson “Observing the occlusion with the teeth in static relation and then moving the mandible into various eccentric positions is not sufficient. A dynamic concept is necessary to produce an occlusion that is functional harmony with facial skeleton , the musculature , and the temporomandibular joint”
STEP BY STEP PROCEDURE FOR REGISTRING OCCLUSAL PATHWAY
After the framework has been adjust to fit the mouth, the technique for registration of occlusal pathways is as follow.
Support the wax occlusion rim -denture base
Occlusal rim -24hours or longer.
3 D occlusion-tooth
4. After 24 hours -Gloss.
Any are of deficient are add this time.
5. After a second 24- 48hours period of wear the registration should be complete and be acceptable.
The remaining teeth that serve as vertical stops should be in contact and the occlusal rim should show an intact glossary surface, representing all each cusp in all extremes of movements.
The registration of occlusal pathways has additional advantages.
It makes obtain jaw relation possible under actual working length condition, with the denture framework in its terminal position, the opposing teeth in function, and the opposing denture, if present fully seated- lost VD.
MATERIAL FOR ARTIFICIAL POSTERIOR TEETH:
Mostly acrylic resin teeth -porcelain teeth.
Acrylic teeth with gold occlusal surface -natural teeth restored with gold occlusal surface.
Porcelain teeth are generally used in opposition to other porcelain teeth.
A acrylic resin teeth -modified -cast gold surface on their occlusal portions.
Arranging teeth to an occluding template
Occlusal surface modified
Center of functional range
Mesiobuccal cusp- buccal groove
ESTABLISHING JAW RELATION FOR A MANDIBULAR REMOVABLE PARIAL DENTURE OPPOSING A MAXILLARY COMPLETE DENTURE: Condition: (1) If mandibular removable partial denture occludes with maxillary complete denture- - If existing denture is satisfactory and occusal plane is oriented to an acceptable anatomic, function and esthetics position then complete denture need not to be replaced and treated as a intact arch. - A face bow transfer is made of that arch and cast is articulated on the articulator. - then face bow and complete denture is removed and irreversible hydrocolloid impression of the denture is made. - A cast is formed from the impression and mount on the articulator. - Than centric relation recorded and transferred to the articulator.
(2) When the removable partial denture replaces all posterior teeth and the anterior teeth are no interfering. A central bearing point tracer is used may be mounted in the plate on maxillary denture. A centric relation are recorded by means of introral stylus tracing against the stable mandibular base. When a existing complete denture opposing a arch on which removable partial denture is fabricated. A cast of complete denture is used during the fabrication procedure.
(3) If the mandibular removable partial dentures is tooth supported then mandibular arch restored first.
The mandibular arch restored first -jaw relation established - full complement of opposing teeth. Thus maxillary complete denture - occluded with an intact arch.
Mandibular RPD – distal extension-occlusion on both simultaneously.
The balanced occlusion is the most important factor for the retention of the prosthesis.
The occlusion must be evaluate before the prosthesis fabrication start.
Preprosthetic mouth preparation must be done for better occlusion reproduction.
Proper method to be used for the record of correct occlusion.
Imbalanced occlusion is the main cause of retention loss of the prosthesis.
Carr A B, Mc Givney G P, Brown D T, McCraken’s Removable partial Prothodontics. 11 th ed, st louis: Mosby; 2008.
Stewart K L, Rudd K D, Kuebker W A, Stewart’s Clinical Removable Partial Prosthodontics. 2 nd , Chennai; 2004.
Miller E L, Grasso J E, Removable Partial Prosthodontics. 2 nd ed, Baltimore: Williams & Wilkins; 1979.