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Prosthesis > Selection of artificial teeth > Flashcards

Selection of artificial teeth Flashcards

1
Q

how can we determine the width of maxillary anterior teeth?

A
  • 1/3 bizygomatic width using facebow
  • from one canine eminence to the other
  • from corner of the mouth to the other
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2
Q

How many mm of the teeth must be shown at rest?

A

2mm of the tip

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3
Q

How many mm of teeth is shown when the lips are short?

A

5mm

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4
Q

How many mm of teeth is shown when the lips are long?

A

flushing of lip on teeth takes place

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5
Q

As length of lip increases, how much of the tooth is shown?

A

decrease tooth shown

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6
Q

What is the shape of the teeth related to?

A

shape of the face = shape of the arch = shape of the teeth

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7
Q

What teeth are selected for tapered faces?

A

tapered face = tapered arch = tapered teeth

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8
Q

What teeth are selected for square faces?

A

square face = square arch = square teeth

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9
Q

What teeth are selected for ovoid faces?

A

ovoid face = ovoid arch = ovoid teeth

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10
Q

What should the labial surface of the tooth be in harmony with?

A

facial profile

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11
Q

What labial surface should be used if facial profile is flat?

A

flat labial surface

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12
Q

What labial surface should be used if facial profile is curved?

A

curved labial surface

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13
Q

What is the facial features of females and what are the anterior teeth selected according to that?

A
  • facial features are curved
  • tapered or ovoid anterior teeth are used
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14
Q

What is the facial features of males and what are the anterior teeth selected according to that?

A
  • facial features are square
  • square anterior teeth should be used
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15
Q

What does the selection of a suitable shade for maxillary anterior teeth depends on?

A
  • patient’s age
  • colour of the patient’s eyes and hair
  • patient’s general complexion
  • patient’s personal approval
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16
Q

What is the most important factor when deciding on a suitable shade for maxillary anterior teeth?

A

patient’s approval

17
Q

What happens to the shade (colour) of teeth as people age?

A

teeth get darker

18
Q

What is the size of posterior artificial teeth compared to posterior natural teeth

A

artificial posterior teeth are 40% less than size of natural posterior teeth

19
Q

Why are artificial posterior teeth have a smaller size than natural posterior teeth?

A
  • increases sharpness of teeth
  • increases cutting efficiency
  • reduces forces applied
20
Q

What are upper posterior teeth parallel to?

A

ala-tragus line (camper’s line)

21
Q

What happens if lower posterior teeth are arranged buccal to the crest of the ridge?

A
  • tooth is directly above denture base
  • when patient eats, it causes denture instability
22
Q

What should the upper anteroposterior dimension be?

A

8-10mm anterior (infront) of incisive papilla

23
Q

Where should the lower posterior teeth be arranged?

A

on the crest of the ridge

24
Q

What happens if lower posterior teeth are arranged lingual to the crest of the ridge?

A
  • cramped tongue
  • rocking and instability of denture
25
Q

What are the causes of cramped tongue?

A
  • teeth are arranged lingually in relation to the crest of the ridge
  • teeth arranged above lateral border of the tongue
26
Q

What is the anteroposterior dimension of posterior lower teeth?

A

teeth arrangement is from canine to befre retromolar pad

27
Q

What happens if teeth are arranged at the retromolar pad?

A
  • retromolar pad is inclined
  • teeth will be inclined
  • forces are lateral
  • instability of denture
28
Q

What is the shape of the lower teeth?

A

same as upper

29
Q

What happens if upper teeth are arranged on the crest of the ridge?

A

collapsing of patient’s mouth

30
Q

Why should the lateral borders of the tongue be higher than lower occlusal plane?

A
  • avoid cramped tongue
  • maintain normal masticatory cycle
  • in coordination of buccinator muscles
  • stability of lower denture
31
Q

What are the causes of cheek biting?

A
  • low VDO
  • lower posterior teeth arranged lateral to crest of the ridge
32
Q

What are the forms of posterior teeth?

A
  • anatomic form
  • modified anatomic form
  • non-anatomic form or monoplane
33
Q

What is anatomic form?

A
  • cusp angles are 33 degrees
  • not used for complete dentures as it is very steep
  • increases lateral forces
34
Q

What is modified anatomic form?

A
  • less cusp angles than anatomic form
  • 20 degrees
  • most commonly used for complete dentures
  • high lateral forces
35
Q

What is non-anatomic form?

A
  • flat occlusal surfaces
  • used in complete dentures sometimes
  • decreased lateral forces
  • not aesthetic
  • blunt (more chewing)
36
Q

What are the conditions that require non-anatomic form?

A
  • cross bite ridge relationship (class 2 and 3)
  • cases suffering from TMJ disturbances
  • cases with advances ridge resorption (flat ridge and short flanges are used so teeth move easily)
37
Q

What are the characteristics of acrylic teeth?

A
  • composition: polymethyl methacrylate
  • specific gravity is low
  • resistance to wear and abrasion is low
  • easy/ /to adjust
  • resilient
  • no clicking sound
  • harmless effect on underlying tissue
  • used for flat and flabby ridges
  • chemical union with denture base
  • affected with direct heat
  • crazing by organic solvents
  • aesthetics is less agreeable than porcelain
38
Q

What are the characteristics of porcelain teeth?

A
  • composition: porcelain material
  • high specific gravity
  • resist wear and abrasion (preserve V.D.O.)
  • difficult to adjust
  • brittle
  • harmful effect on underlying tissues
  • used inn well developed ridges
  • mechanical union with denture base
  • not affected with direct heat
  • resist action of organic solvent
  • aesthetic is more agreeable than acrylic
39
Q

Why is it very recommended to use acrylic teeth?

A

acts as shock absorber

Prosthesis (7 decks)

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