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RPD > MISCELLANEOUS > Flashcards

MISCELLANEOUS Flashcards

1
Q

What is a pre-prosthetic surgery?

A

surgical removal of the following should be evaluated before the fabrication of new partial denture is begun:

  • maxillary and mandibular tori
  • exostoses
  • sharp prominent mylohyoid ridges
  • epulis fissuratum
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2
Q

What is denture stomatitis?

A

a localized or generalized chronic inflammation of the denture bearing mucosa

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3
Q

What does denture stomatitis look like clinically?

A

redness and a burning sensation with or without discomfort

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4
Q

What are the most likely causes of denture stomatitis?

A

trauma and secondary fungal infection

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5
Q

What is the treatment for denture stomatitis?

A
  1. improved oral hygiene
  2. tissue rest
  3. antifungal therapy (nystatin)
  4. resilient tissue conditioners
  5. new, well-fitting dentures
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6
Q

Acute atrophic candidiasis presents as…

A
  • a red patch of atrophic
    Or
  • erythematous red and painful mucosa
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7
Q

What are the symptoms of antibiotic sore mouth (common form of candidiasis)?

A
  • oral burning
  • bad taste
  • sore throat during of after therapy with broad spectrum antibiotics
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8
Q

Patients with ________________ may also develop atrophic candidiasis

A

chronic iron deficiency anemia

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9
Q

Where is papillary hyperplasia found?

A

palatal vault

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10
Q

What causes papillary hyperplasia?

A
  1. local irritation
  2. poor-fitting denture
  3. poor oral hygiene
  4. leaving dentures in 24 hours a day
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11
Q

What is the treatment for papillary hyperplasia?

A
  • educate patient in oral hygiene
  • advice patient to leave denture out at night
  • soak dentures for 30 minutes in a 1% solution of sodium hypocholorite and rinse
  • use tissue conditioner
  • patient should brush irritated area lightly with a soft brush
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12
Q

What is epulis fissuratum?

A
  • a reactive growth in relation to an overextended or ill-fitting denture flange
  • a chronically ill-fitting denture may cause an inflammatory fibrous hyperplasia adjacent to its border
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13
Q

What causes epulis fissuratum?

A
  • long term neglect or settling subsequent to residual ridge resorption
  • traumatic occlusion of natural teeth opposing an artificial denture
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14
Q

What is the treatment for epulis fissuratum?

A

surgical removal of the hyperplastic tissue

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15
Q

Before construction of a complete or RPD, it is very important to remove the _____________ tissue

A

hyperplastic

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16
Q

What is the treatment for hyperplastic tissue?

A
  1. tissue rest
  2. soft reline of existing denture
  3. change in denture habits
  4. surgical removal of tissue
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17
Q

What is the best impression technique for a patient with loose hyperplastic tissue?

A
  • register the tissue in its passive position
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18
Q

What is Kelly’s combination syndrome?

A
  • specific pattern of bone resorption in the anterior portion of edentulous maxilla
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19
Q

When do you usually see kelly’s combination syndrome?

A

mandibular partial denture is opposed by a maxillary complete denture

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20
Q

Where does resorption occur in kelly’s combination syndrome?

A
  • beneath the mandibular extension bases
  • downward growth of the tuberosities and tipping of the occlusal plane (in the anterior)
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21
Q

How do you combat the effects of kelly’s combination syndrome?

A

continous reline or placment of implants in the mandibular posterior location

22
Q

What is tissue conditioner?

A

soft materials that are applied to the intaglio surface of a denture to allow a more equitable distribution of forces throughout the arch

  • non-irritating and non-toxic
  • used to treat unhealthy or abused oral tissue
23
Q

How long does the softness last with tissue conditioners?

24
Q

Tissue conditioner must be changed every ____ days

25
What is tissue conditioner composed of?
powder and liquid - powder is an acrylic polymer (ethyl metacrylate) - liquid is a mix of ethyl alcohol and aromatic ester
26
The mechanism of action of the tissue conditioner is a combo of improved force distribution and _________________________
short-term cushioning effect
27
What is the process for using tissue conditioner?
- intaglio surface of the RPD is checked using PIP - occlusion is check and refined - cameo surface is painted with separator - tissue conditioner is applied in intaglio using a spatula - denture is seated in mouth - use light pressure and maintain as material flows - border tissue should be manipulated to border mold - tongue should be brought forward and forcibly place into each cheek - sit 4-5 minutes - remove and examine - excess material is removed using a blade
28
If posterior artifical teeth are present, the patient must _________________________ while the conditioner is still capable of flowing
close the teeth together
29
Tissue conditioner should not be allowed to...
dry - submerge in water or cleaning solution when not in the mouth
30
Wrought wire is fabricated by...
drawing the metal from which it is made into a wire
31
Wrought wire clasp should have an elongation percentage of more than ___%
6%
32
What is a cast metal?
any metal that is melted and cast into a mold
33
When a casting is _______ to provide the required article or appliance it is called wrought metal instead of cast metal
cold-worked
34
The mechanical properties of wrought wire are _________ to those of the cast structure
superior
35
Wrought wire has ___% greater strength, hardness, and tensile strength that the cast alloy
25%
36
Lab procedures can compormise the desireable physical properties of wrough twire due to...
improper heating and cooling
37
The physical characteristics of wrought wire can be reduced drastically by subjecting the wire to too much...
heat
38
How does too much heat affect wrought wire?
recrystallization or grain growth causes undesirable occurrence
39
Why is chrominum cobalt alloys popular for framework material?
- low density - high modulus of elasticity (stiffness) - low cost - resistance to tarnish
40
Chrominum-cobalt alloys are more _____ in comparision to gold or palladium alloys
rigid
41
What does the chromium do in the framework?
ensure that the alloy will resist tarnish and corrosion
42
What does the cobalt do in the framework?
contributes strength, rigidness, and hardness
43
What does nickel do in the framework?
increases ductility
44
What does carbon do in the framework?
pronounced effect on the strength, hardness, and ductility
45
What does tin, indium do in the framework?
readily oxidized minor components of the alloy function to improve bonding
46
Gold alloys are approximately ____ as flexible as the chromium-cobalt alloys
twice
47
What are the advantages of chromium-cobalt alloys?
- high modulus of elasticity and lower flexibility - low cost - low density
48
What are possible causes of failure of chromium-cobalt alloys?
- cold-working - shrinkage porosity - low percent elongation - excessive carbon in the alloy
49
What does cold-working do to chromium-cobalt alloys?
reduces the percentage of elongation that causes a decrease in hardness
50
What does shrinkage porosity do to chromium-cobalt alloys?
shrink approximately 2.3% and results in porosity
51
What is low percent elongation directly related to in chromium-cobalt alloys?
brittleness
52
What does excessive carbon do to chromium-cobalt alloys?
reacts with the other constituents to form carbides

RPD (21 decks)

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