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BDS M5 Removable Pros > Surveying and denture design principles > Flashcards

Surveying and denture design principles Flashcards

1
Q

What are the 3 main parts of a surveyor?

A
  • surveyor tools
  • movable arm and tool holder
  • adjustable platform
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2
Q

What are the different surveyor tools?

A
  • the analysing rod
  • the graphite marker
  • the undercut marker
  • the chisel
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3
Q

What is the analysing rod used for?

A

analyses tooth and tissue undercuts and determines the path of insertion for the denture

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4
Q

What is the graphite marker used for?

A

scribe tooth and tissue undercuts on the model with graphite marker

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5
Q

What is the undercut gauge used for?

A

measuring desired amount of undercut for the clasp material used

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6
Q

What is the chisel used for?

A

used to trim the blocked out undercut areas on the model

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7
Q

What is the adjustable platform used for?

A

the model on the platform may be tilted anteriorly and posteriorly and left and right laterally to determine a suitable path of insertion for the denture

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8
Q

When is there no undercut?

A

when there is no space between the analysing rod and the tooth

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9
Q

When is there an undercut area?

A

When there is space between the analysing rod and the tooth

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10
Q

What does the graphite marker do when it is used?

A

the longer tip of the lead should contact the tooth to create a survey line and establish the broadest part of the tooth and the undercut and non-undercut area of the tooth

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11
Q

What information is gained from a survey line?

A
  1. indicates the undercut area on a tooth and non-undercut area
  2. the type of survey line indicates what retentive component can be used to help retain the denture
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12
Q

What are the different types of survey lines?

A
  • diagonal survey line
  • high survey line
  • low survey line
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13
Q

What type of clasp is used with a diagonal survey line?

A
  • Occlusally approaching clasp (stainless steel or cobalt chrome)
  • the clasp should taper towards the retentive tip of the clasp
  • the final third of the clasp is below the survey line and will flex over the tooth and into the undercut area
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14
Q

What type of clasp is used with a high survey line?

A
  • gingivally approaching clasp, as two thirds of an occlusally approaching clasp cannot approach from above the survey line
  • positioned on or below the survey line
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15
Q

What type of clasp is used with a low survey line?

A
  • gingivally approaching clasp can be used
  • would be less visible than an occlusally approaching clasp
  • may be positioned mesial, central or distal
  • distal may be more hidden so better aesthetically and is positioned on or below the survey line
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16
Q

What does an undercut gauge determine?

A

the amount of undercut and occlusally approaching clasp can engage depending on the material it is made of?

17
Q

What materials can an occlusally approaching clasp be made of?

A
  • cobalt chrome (brittle)
  • stainless steel (more flexible)
  • gold (most flexible)
18
Q

How much of an undercut can a cobalt chrome clasp utilise?

A

up to 0.25mm (brittle material)

19
Q

How much of an undercut can a stainless steel clasp utilise?

A

up to 0.5mm (more flexible, can engage a deeper undercut than cobalt chrome)

20
Q

How much of an undercut can a gold clasp utilise?

A

up to 0.75mm (more flexible than both chrome and stainless steel)

21
Q

How do you measure the undercut?

A
  • hold the gauge barrel against the tooth and draw upwards until the ledge touches the tooth
  • this is the point where the terminal third of the clasp will finish
22
Q

What are the component parts of dentures?

A
  1. poly-methyl-methacrylate (PMMA) acrylic plate - major connector
  2. saddle areas - consist of the replacement teeth and flange extension
  3. claps - the retentive component
  4. occlusal rests - provide support for the denture
23
Q

What are the 3 functions of occlusal rests?

A
  1. provide support for the denture
  2. directs occlusal loads down the long axis of the teeth
  3. can provide indirect retention
24
Q

finish flashcards from slide 15 ->

A

BDS M5 Removable Pros (2 decks)

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