Morph Exam 1 midterm lectures 1-7 Flashcards
On which surface of the permanent maxillary central incisor does the cervical line exhibit the greatest amount of curvature?
mesial
Which of the following is the most frequently missing anterior tooth?
maxillary lateral incisor
How many pulp horns do the maxillary lateral incisors have?
2
How many pulp horns do the maxillary central incisors have?
3
Compared to the maxillary central incisor, the lingual fossa of the maxillary lateral incisor is:
deeper
How does the mesioincisal line angle of the maxillary later incisor compare to the maxillary central incisor?
More rounded
Which anterior tooth varies in form more than any other tooth?
Maxillary lateral incisor
When is the eruption of the maxillary lateral incisors?
8-9 years
What are some features of the maxillary lateral incisor compared to the m. central incisors?
- Smaller in all dimensions (except length of root) - More rounded - More pronounced mesial and distal marginal ridges (lingual fossa is deeper) - More often exhibit lingual pits - May have lingual developmental groove
What is the geometric form of the m. lateral incisor from the facial view?
trapezoidal
Where is the mesial height of contour in the maxillary lateral incisor?
junction of the middle and incisal 1/3’s
Where is the distal height of contour in the maxillary lateral incisor?
Middle 1/3 (more rounded distally so it will be higher)
Is the labial surface more convex in the maxillary central or maxillary lateral incisor?
Maxillary lateral incisor
All of the following incisal angles are rounded EXCEPT the:
Mesioincisal angle of the Maxillary central incisor
According to the universal notation system, tooth #26 is the:
Mandibular right lateral incisor
Which tooth is 2x as long mesio gingivaly as it is mesio distally?
mandibular central incisor
What is the only symmetrical tooth in the mouth?
mandibular central incisor
What are the MI and DI angles of the mandibular central incisor?
90 degrees
True or false, both contacts of the mandibular central incisor occur at the same level?
True Level is incisal 1/3
Regarding the mesioincisal and distoincisal angles of the mandibular central incisors:
both are right angles
The smallest permanent tooth in the mouth is the:
mandibular central incisor
Which of the following is a characteristic of ALL mandibular incisors?
they have marginal ridges on their lingual surface
Which of the following permanent incisors has the deepest lingual fossa?
Maxillary lateral incisor
When does the maxillary central incisor erupt?
7-8 years
What is the name of the highlighted embrasure? (embrasure superior to maxillary incisors)
Gingival embrasure
What is the name of the highlighted embrasure? (embrasure pointing facially/bucally)
facial embrasure
When is the first sign of tooth development?
6-7 weeks in utero
What is the longest tooth in the maxillary arch?
Maxillary canine
How many lobes does the maxillary canine develop from?
4
What is the first permanent tooth to erupt?
Mandibular first molar
Which anterior tooth is most likely to have a bifurcated root?
mandibular canine
In comparison to a mandibular canine, a maxillary canine:
Has a cusp tip that is 1/3 of crown surface
Which of the following teeth is broader faciolingually than mesiodistally?
mandibular central incisor
Using universal notation, what is the tooth number of the permanent maxillary left 1st molar?
14
What tooth number is the maxillary right 1st premolar?
5
What tooth number is the maxillary right 2nd premolar?
4
What tooth number is the maxillary right canine?
6
What tooth number is the maxillary left canine?
11
What tooth number is the maxillary left 1st premolar?
12
What tooth number is the maxillary left 2nd premolar?
13
What tooth number is the maxillary left 1st molar?
14
What tooth number is the maxillary right 1st molar?
3
What tooth number is the mandibular right 3rd molar?
32
What tooth number is maxillary right 2nd molar?
2
Which cusp of the pre molar is functional?
Lingual
how many lobes do the maxillary pre molars develop from?
4
Central development groove
demarcation between buccal and lingual lobes
When does the maxillary 1st premolar typically erupt?
10-11 years
Traits of first pre molar buccal cusp
- mesial cusp arm is longer and straighter - distal cusp arm is shorter and more curved (opposite of what we saw in canine)
Where is the buccal height of contour in the maxillary 1st premolar?
cervical 1/3
Where is the mesial contact in the maxillary 1st premolar?
middle 1/3 (offset buccally)
Distal contact of the maxillary 1st premolar
-middle 1/3 - broader and more cervically located (compared to mesial)
Middle buccal lobe of max. 1st premolar
gives rise to buccal ridge gives rise to buccal cusp
When viewed from the buccal, what is the geometric form of the maxillary 1st premolar?
Trapezoid
Is the 1st max premolar broader (M-D) lingually or buccally?
-buccally - (crown tapers on lingual side)
Lingual cusp trends of max first pre molar
- mesiolingual cusp arm is shorter than distolingual cusp arm (opposite of the buccal cusp)
Where is the lingual height of contour in the maxillary first premolar?
middle 1/3
how much of the maxillary 1st premolar root is encompassed by the root trunk?
1/2 - 2/3 of root
How many pulp horns are found in the permanent maxillary canine?
1
Maxillary 2nd premolar buccal cusp trends
-mesial buccal cusp ridge is shorter than the disto buccal cusp ridge (opposite of 1st max premolars) - buccal cusp is not as long
Lingual cusp trends of max 2nd premolar
Lingual cusp is longer than lingual cusp of 1st max pre molar
Maxillary 2nd premolar Mesial view
-Mesial contact in middle 1/3 (slightly offset buccally) -No mesial marginal ridge developmental ridge - No mesial developmental depression - single tapered root - buccal and lingual cusp are approximately equal in size and shorter than 1st max pre molar
heights of contour in maxillary 2nd pre molar?
-lingual is in middle 1/3 - buccal is in cervical 1/3
Distal contact of maxillary 2nd pre molar?
-middle 1/3 (offset bucally)
True or False? In the maxillary 1st premolar, the mesial cusp arm of the buccal cusp is shorter than the distal cusp arm?
false
Which of the following teeth has a root trunk that is 1/2 to 2/3’s the length of the root?
Maxillary 1st pre molar
Which of the following teeth have crowns that are narrower buccolingually than mesiodistally? Maxillary central incisors Maxillary canines Maxillary 1st premolars Maxillary 2nd premolars
Maxillary central incisors
The mesial marginal ridge groove is found in which of the following teeth? Maxillary canines Mandibular canines Maxillary 1st premolars Maxillary 2nd premolars Both maxillary 1st and 2nd premolars
Maxillary 1st premolars
Identify this tooth
Maxillary first pre molar
What tooth number is the madibular left premolar?
21
What tooth number is the mandibular left 2nd premolar?
20
What tooth number is mandibular right 1st premolar?
28
Are the mandibular premolars succedaneous teeth?
Yes, they replace the primary molars
How many lobes do the madinular 2nd molars develop from?
4 or 5
Is the mesial line of the buccal cusp, longer or shorter than the distal in the mandibular first premolar?
It is shorter (this is opposite of the maxillary first premolar)
Where are the heights of contour in the madibular first premolar? (buccal view)
middle 1/3
Is the mandiublar premolar wider M-D at the contact point or at the cervix?
At the contac points (crown narrows towards the cervix)
The outline of the crowns of all posterior teeth from the facial and lingual views is best described as:
Oval
Rhomboidal
Trapezoidal
Triangular
trapezoidal
mesio lingual developmental groove (found in mandibular 1st premolar)
- demarcates the lingual lobe from the mesiobuccal lobe
- seperates mesial marginal ridge from lingual cusp
What shape is the 1st mandibular premolar from the mesial view?
rhomboidal
Buccal cusp tip of mandibular 1st premolar
-centered over midline of the root
What is the buccal height of contour of the mandibular 1st premolar?
At the juncion of the middle and cervicle 1/3
Lingual height of contour in mandibular premolar
- lingual to outline of root
- in the middle 1/3
True or False in mandibluar 1st premolars: The distance from the CEJ to the lingual cusp tip is 2/3 the distance of the CEJ to the Buccal cusp tip
True
The embrasures of posterior teeth are called:
occlusal, gingival, lingual, buccal
In the mandibular 1st premolar, which is higher above the cej? The distal marginal ridge or the mesial marginal ridge
The distal marginal ridge
-(only tooth in which the mesial marginal ridge is at a lower level than the distal marginal ridge)
Which contact area in the mandibular first pre molar is broader?
- distal or mesial
distal
(located in the middle 1/3)
Occulsal view of the mandiublar first pre molar
- diamond outline
- buccal cusp and buccal ridge are pronounced
- lingual cusp is small
-mesiobuccal cusp ridge is shorter than the distobuccal cusp ridge
Mandibular first molar width
-Wider (M-D) in the buccal than it is the lingual
Transverse ridge
present in mandibular 1st premolar
- formed from the buccal triangular ridge and lingual triangular ridge
- seperates occlusal fossa
is the mesial or distal triangular fossa larger in mandiublar 1st premolar?
distal
In the mandibular first premolar, which groove separates the mesial marginal ridge from the lingual cusp?
mesiolingual groove
There are two types of mandibular 2nd pre molars
- 3 cusp type (5 lobes)
- 2 cusp type (4 lobes)
Buccal cusp of 2nd mandibular pre molar
-shorter and less pointed than first
Are the Lingual lobes better developed in the 1st or 2nd mandibular pre molars?
2nd
What seperates the two lingual cusps on a 3 cusped mandibular 2nd premolar?
the lingual groove
How does the mandibular 2nd molar differ from the mandibular 1st molar?
- Crown and root are wider buccolingualy
- Buccal cusp tip is not as lingually placed
- Buccal cusp tip is shorter
- Lingual and Buccal cusps are more equal in size
- Mesial marginal ridge is at right angle to the long axis of the tooth
- No mesialingual developmental groove
- Root is longer and the apex is more blunt
When viewed from the mesial aspect, the position of the buccal cusp tip of the mandibular 1st premolar is:
centered over the midline of the tooth
Occlusal view of 3 cusp mandibular 2nd molar
- square in shape
- two lingual cusps
- one buccal cusp
Buccal> mesolingual > distolingual
Three cusp type
- developmental grooves seperate the cusps forming a Y shape on occlusal surface (mesial, distal, and lingual developmental grooves)
- Central pit
- Mesial triangular fossa and distal triangular fossa
Two cusp type (mandibular 2nd molar)
(occlusal view)
- H or U developmental grooves
- Outline is rounded
- lingual convergence of the mesial and distal marginal ridges
- H shape more common
- Lingual cusp well developed
- mesial and distal fossa
- Central develop mental groove
_ may or may not have grooves
Overview of Mandibular 2nd premolars
The premolar with the occlusal groove pattern that may simulate the letter “Y” is the:
mandibular 2nd premolar
Which of the following premolars often has two roots?
Maxillary 1st premolar
What are the tooth numbers of the central incisors?
Maxillary (8,9)
Mandiublar (24,25)
What are the tooth numbers of the lateral incisors?
Maxillary (7,10)
Mandibular (23,26)
What are the tooth numbers of the canines?
Maxillary (6, 11)
Mandibular (22, 27)
What are the tooth numbers of the premolars?
Maxillary (4,5, 12,13)
Mandibular (20,21, 28,29)
What tooth number are the molars?
Maxillary (1,2,3, 14,15,16)
Mandibular (17,18,19, 30,31,32)
When is the first sign of tooth development?
6-7 weeks in utero
When do deciduous teeth begin to calcify?
13-20 weeks in utero
When do decidous teeth complete calcification?
18-20 weeks in utero
When do decidous teeth starts to erupt?
6-30 months
Eruption
emergence into the. oral cavity
Exfoliation
loss of a deciduos tooth
How many pre molars are in decidous teeth?
0
Deciduous dentition
Only when deciduous teeth are in the mouth (up to 6 years of age)
Mixed dentition
Mixture of permanent and decidous teeth
Non-succedaneous teeth
Do not replace primary dentition
Is the apex of the root in the maxillary central incisor slightly distal or mesial to the long axis of the tooth?
distal
The root of #8/9 is longer than the crown? T/F
true
What has the greatest amount of curviture of any tooth in the mouth?
The mesial cervical line of the maxillary central incisors
The shape of the maxillary central incisor when viewed from the mesial is best described as:
triangular
Embrasure trends
Mandibular central incisor cej
- extends one mm longer apically on lingual than labial
- curves 1 mm less on distal than mesial
In which premolar is the mesial marginal ridge at a lower level than the distal marginal ridge?
- mandibular 1st pre molar
Which pre molar may have a lingual developmental groove?
- mandibular 2nd pre molar (3 cusp y shaped type)
Which of the following premolars most frequently has only one pulp horn?
- mandibular 1st pre molar
1 of 1
close
In which of the following premolars is the mesial cusp ridge of the buccal cusp longer than the distal cusp ridge of the buccal?
- maxillary 1st premolar
how many cusps are in the mandibular 1st molar?
- 5
how many cusps are in the mandibular second molar?
- 4
