Jaw Relation Records & Techniques for RPD PPT
Jaw Relation Records & Techniques for RPD PPT
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Jaw Relation Records & Techniques for RPD
Why to Record the Jaw Relations ?
- To establish and maintain a harmonious relationship with all oral structures and to provide a masticatory apparatus that is efficient and esthetically acceptable.
- To ensure that all the effects of occlusal loading be distributed as evenly as possible to all supporting structures capable of receiving the force.
- To best control the undesirable effects of rotational or torquing forces on the prosthesis.
- To prevent any deflective contacts of the teeth during centric or eccentric closures as these can produce pathological changes in the supportive structures or in the neuromuscular mechanism that controls mandibular movement.
Jaw Relation Records – A Review
- Vertical Jaw Relations:
- Rest Vertical Dimension ‘RVD’
- Occlusion Vertical Dimension ‘OVD’
- Horizontal Jaw Relations:
- Centric Relation
- Centric Occlusion
- Eccentric Relations
- Protrusive relation
- Lt & Rt Lateral relations
- Face bow Registration.
Vertical Jaw Relation
The vertical distance between two selected points, one on the fixed (maxilla) and one on the movable member (mandible).
Vertical Jaw Relations
Rest Vertical Dimension ‘RVD’
Occlusion Vertical Dimension ‘OVD’
Inter-occlusal Distance / Free way Space
Rest Vertical Dimension (RVD)
Is the distance measured when the mandible is in the rest position.
Occlusal vertical Dimension (OVD)
Is the distance measured when the occluding rims or teeth are in contact.
Inter-occlusal Distance
The distance between the occluding surfaces of maxillary and mandibular teeth when the mandible is in the rest position.
For a complete denture patient, it is the difference between RVD and OVD.
RVD – OVD = 4 mm
or RVD – 4 mm = OVD
In natural dentition it ranges from 2-4 mm in the premolar area – the Freeway Space.
Vertical Jaw Relations
If stable occlusal contacts are provided by the remaining natural teeth, the existing OVD and CO relation should be recorded.
For the patients whom one of the arch is edentulous or whom the opposing teeth do not provide stable occlusal contacts, OVD has to be measured as follows,
RVD – OVD = 3 – 4 mm
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Category: Lectures, Prosthodontics
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