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Prosthetics > Connector Design > Flashcards

Connector Design Flashcards

1
Q

Name 4 functions of a connector

A
  1. Connect parts of RPD
  2. Support
  3. Direct retention
  4. Indirect retention
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2
Q

Name 2 ways support is provided by a connector

A
  1. Hard palate

2. Tooth contact above survey line

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3
Q

Name 2 ways direct retention can be provided by connectors

A
  1. Engage undercuts

2. Guide planes

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4
Q

Name 5 ideal properties of a connector

A
  1. Must be rigid
  2. Be a shape well tolerated by patient
  3. Should not impinge upon gingival margins
  4. Should not create stagnation areas
  5. Provide support where required
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5
Q

Name 4 common upper connectors used in RPDs

A
  1. Palatal plate
  2. Mid palatal strap
  3. Horseshoe
  4. Skeletal
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6
Q

Describe a palatal plate as an upper connector

A
  • CoCr 0.5mm thick and broad coverage for support
  • Acrylic plate at least 2mm thick
  • Minimal of 6mm away from gingival margins
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7
Q

Describe a mid palatal strap as an upper connector

A
  • Minimum dimensions 0.5 x 15mm

- Strap completely tooth supported

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8
Q

Describe a skeletal design as an upper connector

A
  • Combination of anterior and posterior bars
  • 0.75mm thick
  • Clears mid palate but bars are thicker than strap or plate
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9
Q

Describe a horseshoe design as an upper connector

A
  • Avoids coverage of palate but does cover many gingival margins
  • Ideal when many small saddles being replaces
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10
Q

Name 6 common lower connectors

A
  1. Lingual bar
  2. Sub-lingual bar
  3. Lingual plate
  4. Combination bar
  5. Dental bar
  6. Buccal bar
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11
Q

Describe how to decide between lingual bar, sub-lingual bar and lingual plate

A

Measure distance from lingual gingival margins to FOM:

8mm or more - Consider lingual bar first choice
5-7mm - Consider sub-lingual bar first choice
4mm or less - Consider lingual plate as first choice

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12
Q

Describe a lingual bar as a lower connector

A
  • Lies against the alveolus
  • Minimum of 8mm space required
  • 2mm clear of gingival margin, 4mm width of bar, 2mm clear of FOM
  • If more than 8mm available make bar broader
  • Bar tear drop shape for better toleration
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13
Q

Describe a sublingual bar as a lower connector

A
  • Lies in anterior lingual sulcus
  • Minimum 5mm space required
  • Clear gingival margin by 2mm
  • Good rigidity and tolerance
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14
Q

Describe a lingual plate as a lower connector

A
  • Must be used if under 5mm from gingival margins to FOM
  • Must be rigid so as not to flex on loading
  • Must cover gingival margins to achieve rigidity
  • Enhanced risk to oral health as a result
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15
Q

Describe a dental bar as a lower connector

A
  • Not fit for purpose
  • Lies on cingulum for lower teeth
  • Connector would have to be so thick for support it is intolerable
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16
Q

Describe a combination bar as a lower connector

A
  • Combination of dental and lingual bar
  • Reinforce one with the other
  • Poor tolerance as patient tongue guided to gap between two bars
17
Q

Describe a buccal bar as a lower connector

A
  • Used when there are gross lingual undercuts so no PoI is found
  • Must be fully tooth supported
18
Q

What is bracing?

A

Contact of a connector against tooth surface to stop the denture moving

19
Q

Name 2 types of acrylic temporary denture

A
  1. Spoon denture

2. Modified spoon denture

20
Q

Describe spoon dentures

A
  • Often supplied to younger patients before definitive restorative treatment
  • Stays in place with tongue pressure
21
Q

Describe modified spoon dentures

A
  • Similar to spoon denture designs
  • Small extension of acrylic towards molars and pre molars used
  • Possibly employ clasp if there are problems with retentions

Prosthetics (16 decks)

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