Removable Prosthetics Flashcards
What are the components of a removable partial denture?
rests, direct retainers, major connectors, minor connectors, denture base connectors, denture base, teeth
What are Rests?
rigid extensions of a partial denture that rest on the occlusal surface and transfer the biting load along the long axis of the tooth
What is the function of rests?
provide support and stability and to control the position of teeth
What are Direct Retainers?
Clasps - the component of a partial denture that prevents it moving
What is the function of direct retainers?
provide retention and stability, control the position of the denture in relation to the teeth
What is a major connector?
the big areas connecting two components of a denture together
What is the function of a major connector?
Provide support to the teeth and arch and to stabilise the arch
What are minor connectors?
Connects the small components (such as rest seats) to the larger components (such as major connectors)
What is the function of a minor connector?
Provide stability and bracing
What is a proximal plate?
A type of minor connector that prevents forward/backward movement of the denture via contacts with the abutment teeth
What is the function of a proximal plate?
provides stability to counteract forward/backward movement and aid retention
What is a denture base connector?
the part of the framework where the base of the denture is connected
What is the function of the denture base connector?
to allow mechanical interlocking of the acrylic and metal components of the denture
What is the denture base?
Where the replacement teeth are
What are the components of clasp assembly?
Clasp/retentive element; Opposing Bracing arm; Rest Seat; Proximal Plate
What is the function of the bracing arm in clasp assembly?
prevent the retentive arm from moving the teeth
What is the function of a rest seat in clasp assembly?
ensures the clasp is in the correct position
What are the steps involved in making a denture?
Case Assessment; Primary Imps; Articulation; Surveying; Denture Designing; Mouth prep: Composite Addition, Rest Seat Prep, Guide Plans; Secondary Imps; Metal Try-in; Jaw Registration; Teeth Try-in; Fit of Denture
Why should you articulate models?
to replicate the occlusion that is within the patient’s mouth so you can hold the models in the same way each time
When is a tripod contact important?
if you have free end saddles
Why is a tripod contact important with free-end saddles?
the spaces between the saddle and the opposing arch will not be correct if there is not a tripod contact
How can you create a tripod contact with occlusion containing a free end saddle?
using a wax rim
What is the purpose of surveying?
to assess the path of insertion/removal of the denture and to seek out undercuts where clasps could engage as well as determining potential guide planes
In which order should you design a denture?
kennedy class (saddles), cradock class (support), retention, reciprocation, indirect retention, major connector
Where do you need rest seats?
next to every saddle
How many rest seats do you need if the saddle contains multiple teeth?
2, one each side
Where do you want a clasp in regard to tooth contour?
below the height of tooth contour and above the gingival margin
Does every clasp need a rest seat?
yes
Does every rest seat need a clasp?
no
What are two types of clasp?
gingivally approaching and occlusally approaching
On which teeth would you use a gingivally approaching clasp?
canines and premolars