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Dental Anatomy > Exam 2 Review (Part 2) > Flashcards

Exam 2 Review (Part 2) Flashcards

1
Q

Permanent Maxillary Central Incisor: (Lingual) How is the cervical outline of the crown different than what is seen on the facial aspect?

A

It is more apically-positioned (away from the incisal)

- It is not a semicircle in shape as is seen on the facial surface

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2
Q

Permanent Maxillary Central Incisor: (Lingual) Describe the lingual fossa in the incisal one-half of the crown

A

it is described as a wide, shallow “dish-shaped” depression

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3
Q

Permanent Maxillary Central Incisor: (Lingual) The lingual fossa is bound by what things?

A
  • Linguo-incisal ridge
  • Mesial ridge
  • Distal marginal ridges
  • Cingulum
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4
Q

Permanent Maxillary Central Incisor: (Lingual) Lingual fossa is what shape?

A

Trapezoidal

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5
Q

Permanent Maxillary Central Incisor: (Lingual) Describe the cingulum and in what portion of the crown it exists?

A

It is well-developed
Positioned in the cervical one-half of the crown
- Often has two ridge projections that impinge on the lingual fossa in the middle third

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6
Q

Permanent Maxillary Central Incisor: (Lingual) The greatest curvature lingually of the cingulum and the crest of the cervical line gingivally will be what direction of the long axis bisector of the crown?

A

Will be slightly distal to the mesiodistal long axis bisector of the crown

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7
Q

Permanent Maxillary Central Incisor: Which is greater, the mesiodistal width or faciolingual diameter?

A

Mesiodistal width (8.5 mm) is greater than the faciolingual diameter (7.0 mm)

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8
Q

Permanent Maxillary Central Incisor: The interproximal contact areas are centered how?

A

faciolingually

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9
Q

Permanent Maxillary Central Incisor: The incisal edge (ridge) is relatively what shape and at what angle to the mesiodistal bisecting plane?

A

Relatively straight and perpendicular (90 degree angle) to the mesiodistal bisecting plane

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10
Q

Permanent Maxillary Central Incisor: How is the incisal edge positioned in comparison to the faciolingual bisecting plane?

A

Parallel

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11
Q

Permanent Maxillary Central Incisor: Which line angle is more developed

A

Mesiofacial line angle is more developed than the distofacial line angle

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12
Q

Permanent Maxillary Lateral Incisor: (Incisal) The crown is wider in which direction?

A

Wider mesiodistally (6.5 mm) than it is faciolingually (6.0 mm)

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13
Q

Permanent Maxillary Lateral Incisor: (Incisal) The incisal ridge is centered how?

A

Faciolingually

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14
Q

Permanent Maxillary Lateral Incisor: (Incisal) The incisal ridge crosses approximately midway between the facial and lingual outline; however, it also shows what?

A

Some curvature with the convexity toward the facial

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15
Q

Permanent Maxillary Lateral Incisor: (Incisal) Describe facial outline

A

Is more continuously convex than that of the maxillary central incisor and the mesiofacial and distofacial line angles are more rounded and less prominent

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16
Q

Permanent Maxillary Lateral Incisor: (Incisal) Lingual crown outline

A

Converges sharply toward the lingual

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17
Q

Permanent Maxillary Lateral Incisor: (Incisal) Crest of the lingual outline of the cingulum is what direction to the mesiodistal bisector

A

Slightly to the distal

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18
Q

5 permanent maxillary canine attributes

A
  1. Extremely important to a patient’s smile & overall esthetic appearances
  2. Possesses very consistent and well-developed anatomy
  3. Seldom has a bifurcated root
  4. From facial aspect, the crown has a decidedly trapezoidal-shaped form
  5. Long roots with root surface depressions make this tooth exceptionally difficulty to remove
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19
Q

Permanent Maxillary First Premolar: (MESIAL) Location of mesial proximal contact area

A

Located just cervical to the facial segment of the mesial marginal ridge, facial to the mesial marginal developmental groove

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20
Q

Permanent Maxillary First Premolar: (OCCLUSAL) Mesial and distal triangular fossae are…?

A

Far apart and close to the mesial and distal occlusal outlines

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21
Q

Permanent Maxillary Second Premolar: (OCCLUSAL) T or F, Triangular ridges are approximately the same length and the point at which they meet is located slightly lingual to the bisector of the crown.

22
Q

Permanent Maxillary Second Premolar: (OCCLUSAL) T or F, There is often a true, continuous transverse ridge since the two triangular ridges are separated by a central groove

A

False, Rarely this will occur

23
Q

Permanent Mandibular First Premolar: (MESIAL) Where is the lingual cusp tip positioned?

A

It is positioned so that it is not supported by the root structure. In fact, the lingual cusp tip is actually more lingually positioned than the confines of the lingual root surface

24
Q

Permanent mandibular First Premolar: (OCCLUSAL) Describe the bottom of the mesial triangular fossa

A
  • It has a mesial groove at the bottom of it that is linear in shape and is continuous with the mesiolingual groove
25
Q

Permanent mandibular First Premolar: (OCCLUSAL) the mesial groove is continous with what?

A

the mesiolingual groove

26
Q

Permanent mandibular second Premolar: (OCCLUSAL) Outline is what shape?

A

External occlusal outline geometric shape can be either square or five-sided (Pentagonal), depending on whether the outline of the facial ridge is utilized in the diagram

27
Q

Permanent Maxillary First molars: (LINGUAL) At what angle do the mesial cuspal ridge of the mesiolingual cusp meet the mesial outline of the crown?

A

At a 90 degree right angle

28
Q

permanent maxillary First Molars: (DISTAL) The outline of the lingual root is what shape? How is the apex of the lingual root positioned?

A
  • Banana shaped (similar to that seen from mesial view)

- Apex is vertically positioned between the greatest lingual contour of the crown and the tip of the DISTOLINGUAL CUSP

29
Q

Permanent Maxillary First Molars: (OCCLUSAL) The low point of the oblique ridge is at the same level as the depth of what ridges?

A

The mesial and distal marginal ridges

30
Q

Permanent Maxillary Second Molars: (OCCLUSAL) Which cusp is the most lingually and distally placed cusp?

A

The distolingual cusp

31
Q

Permanent Maxillary Second Molars: (OCCLUSAL) What extends from the distal triangular pit in a lingual direction parallel to the oblique ridge and continues onto the lingual surface as the lingual groove

A

The distal oblique groove

32
Q

Permanent mandibular First Molar: (OCCLUSAL) Which half of the crown is wider between facial and lingual halves? Why?

A

The facial half of the crown is much wider than lingual half, because of the three facial cusps.

33
Q

Permanent Mandibular First Molar: (OCCLUSAL) Describe the central groove

A

It runs mesiodistally in an irregular direction across the occlusal surface from the mesial triangular pit through the central fossa to the distal triangular pit.

34
Q

Permanent Mandibular First Molar: (OCCLUSAL) Describe the lingual groove

A

Starts in the central pit and travels minimally over to the lingual surface

35
Q

Permanent Mandibular Second Molar: (OCCLUSAL) Where is the greatest faciolingual measurement? Why?

A

It is in the mesial half of crown because the cervical ridge is more prominent on the mesiofacial cusp

36
Q

Permanent Mandibular Second Molar: (OCCLUSAL) Describe how the facial groove, lingual groove and central groove come together?

A

they come together at right angles dividing occlusal surface into mesial and distal halves. They make a cross sign (+)

37
Q

4 Characteristics of pulp cavity/

A
  1. A “closed” system
  2. Primarily soft tissue
  3. Living, responding tissue
  4. Young vs. Old pulp chambers (Pulp chamber will decrease with advancing age)
38
Q

Perm. Maxillary Central Incisors: The pulp chamber is wider on what aspect?

A

The facial aspect, this is in cervical cross-section

39
Q

Perm. Maxillary Central Incisors: How many distinct pulp horns in the pulp chamber?

40
Q

Perm. maxillary Central Incisors: Each pulp horn is underneath what?

A

a separate lobe

41
Q

Perm. maxillary Central Incisors: Central incisor has how many roots with how many canals?

A

One root with one canal in nearly 100 % of all samples

42
Q

Perm. Maxillary central Incisors: The pulp canal has a rounded outline in what cross section?

A

The mid-root cross section

43
Q

Perm. Maxilary Central incisors: The incisal view of the cervical cross section displays what shaped chamber?

A

Triangular

44
Q

The percentage of frequency of canals and roots for maxillary first premolar

A
  • Two canals = 83%
  • One Canal = 12%
  • Three Canals = 2%
  • Two roots = 75%
  • One root = 23%
  • Three roots = 2%
45
Q

Maxillary First Molar: Mesiofacial Root percentages and Distofacial root percentages

A 
Mesiofacial
- Two or More canals = 59.2%
- One canal = 40.8%
Distofacial
- One canal = 98.3
- Two or more canals = 1.7%
46
Q

Maxillary First Molar: Lingaul Root percentages and Other pertinent percentages (how many roots or fusion)

A 
Lingual 
- One canal = 99%
- Two or more canals = 1%
Other:
- Three roots = 95.9%
- Two roots = 3.9%
- Fusion of any 2 or 3 roots = 5.2%
47
Q

How often are two roots seen in mandibular first molars?

A

Seen in 90% of samples

48
Q

How often are three roots (mesial, distofacial, distolingual roots) seen in mandibular first molars?

A

Seen in 10% of samples

49
Q

Perm. Mandibular first molar: Mesial and Distal root percentages

A 
Mesial
- Two or more canals = 95.7%
- One canal = 4.3%
Distal 
- One canal = 68.4%
- Two or more canals = 31.6%
50
Q

Perm. Maxillary First Molar: (pulp canal orifice outline) Which line is longest?

A

Between mesiofacial and lingual orifices

51
Q

Perm. maxillary First Molar: (pulp canal orifice outline) Which line is shortest?

A

Between mesiofacial and distofacial orifices

52
Q

T or F, Primary curvature of dentinal tubules increases in the root structure

A

False, it decreases

Dental Anatomy (8 decks)

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