LO 5 - Deciduous Dentition

Question 1

_______ anteriors are smaller in both crown and root and _______ molars are wider

Answer 1

1. Deciduous
2. Deciduous

Question 2

Deciduous roots are ________ in comparison to their crowns as compared to permanent teeth

Answer 2

Longer

Question 3

Deciduous roots are very ________ when compared to permanent roots

Answer 3

Narrow

Question 4

What do deciduous Roots do at the cej that permanent Roots do not?

Answer 4

Narrow

Question 5

Compared to permanent teeth, deciduous root trunks are ________

Answer 5

Very short

Question 6

The cervical ridge of enamel on both the facial and lingual side is ________ on deciduous molars

Answer 6

More prominent (bumps way out before the root)

Question 7

The occlusal surface of deciduous molars ________ more compared to permanent teeth

Answer 7

Taper in

Question 8

How would you describe the roots of deciduous molars compared to permanent molars?

Answer 8

The roots of deciduous molars are longer and more slender than the roots of permanent teeth. These roots also flare apically and allow room in between for the developing permanent tooth crowns

Question 9

How would you compare the color of primary teeth versus permanent teeth?

Answer 9

1. Deciduous teeth are usually lighter in color than permanent teeth - they have a lighter color with a bluish cast
2. Permanent teeth have more yellow, gray, or brown tones

Question 10

The pulp chambers of deciduous teeth are __________ in comparison with the enamel/crowns

Answer 10

Relatively large

Question 11

The pulp horns of deciduous teeth are ________ to the enamel because they ________

Answer 11

1. Closer to the enamel
2. Extend high occlusally

Question 12

How would you describe the Denton thickness of deciduous teeth compared to permanent teeth?

Answer 12

It is much thinner in deciduous teeth

Question 13

How would you compare the enamel of deciduous teeth compared to permanent teeth?

Answer 13

The enamel of deciduous teeth is relatively thin and has a consistent depth

Question 14

What is the importance of deciduous teeth?

Answer 14

1. Development of the muscles of mastication
2. The formation of the bones of the Jaws
3. Location, alignment, and occlusion of the permanent teeth
4. Maintain a place for the permanent teeth

Question 15

Describe the identifying features of deciduous maxillary Central incisors

Answer 15

1. Similar to its permanent successor in position, function, and shape
2. The crown is wider than it is long
3. The crown is bulbous, with great cervical constriction
4. Labial surface is smooth, usually there are no depressions
5. Distinct lingual features, highly developed singulum and prominent marginal ridges
6. Smooth and sizable Edge - usually no mamelons are present

Question 16

Describe the identifying features of deciduous maxillary lateral incisors

Answer 16

1. Similar in shape but smaller than central incisor of the same dentition
2. Distoincisal angle is considerably more rounded
3. Crown’s length is greater than its width
4. The root appears much longer in proportion to the crown when compared with the central

Question 17

Describe the roots of deciduous maxillary incisors

Answer 17

1. Appears constricted at its cervical third
2. Is twice as long as the crown and tapers evenly toward a blunt Apex
3. Amusial concavity is on the root surface, but the distal surface is generally convex
4. The lateral incisor surface is longer and more tapered than the central incisor

Question 18

Describe deciduous mandibular Central incisors

Answer 18

1. Mamelons or grooves may be visible in the labial view
2. The crown appears wide in comparison with its permanent successor
3. The mesial and distal sides of the crown taper evenly from the contact areas
4. The root may be 2 to 3 times the height of the crown
5. The root is very narrow and is also conical in shape
6. Lingual surface has a cingulum, two faint marginal ridges, and a slight lingual fossa

Question 19

Describe the identifying features of deciduous mandibular lateral incisors

Answer 19

1. The mandibular lateral incisors are wider and longer than the Central incisors, and their cingulum are more developed
2. The laterals also have more depth
3. There is a tendency for the incisal ridge to slope distally
4. The distal marginal ridge is more rounded

Question 20

Describe the roots of deciduous mandibular incisors

Answer 20

1. The root of the lateral incisor is longer, narrower, and more tapered than that of the central - it also is less blunt at the Apex
2. The lateral has a distal longitudinal groove and a mesial depression running lengthwise
3. The mandibular Central incisors root is just a little shorter and does not have any grooves or depressions on its root surface

Question 21

Describe the identifying features of deciduous maxillary canines

Answer 21

1. Bulkier than the primary incisors in all dimensions
2. Facial lobes are well developed
3. Crown is constricted at the cervix
4. Crown is wide - A sharp cusp is slightly distal to the center of the tooth
5. Both the crown and the root at the cervical third are deeper than the incisors
6. They have pronounced lingual features - prominent singulum, marginal ridges, and a lingual ridge

Question 22

Describe the identifying features of deciduous mandibular canines

Answer 22

1. The labial surface is much flatter and the lingual features are less prominent than the maxillary canines
2. The distal cusp ridge is longer than that of a maxillary canine
3. Most obvious difference between Max and mand is that mandibular canines only have one lingual fossa instead of two
4. The mandibular canines have less depth than the maxillary canines
5. The lingual surface shows a definite tapering toward the cingulum

Question 23

Describe the roots of deciduous mandibular canines

Answer 23

1. The roots are almost twice as long as they’re crowns, and are thicker than the roots of the incisors
2. Their apices are more blunt
3. The mandibular route is slightly shorter than the maxillary root and is more tapered
4. Both have roots that taper lingually and apically
5. They are triangular and cross-section

Question 24

Describe the distinguishing features of deciduous maxillary first molars

Answer 24

1. Unique Crown which does not resemble any other primary or permanent molar crown
2. It is a blend of a premolar and a molar
3. It has more depth than width
4. It has two major cusps- mesiobuccal and mesiolingual; and one minor cusp - distobuccal, which is only half as large as the mesiobuccal (crown may have three or four cusps)
5. An oblique ridge which is a characteristic of maxillary permanent molars is also on the maxillary primary molars
6. Deciduous first molars have an extreme convexity in the cervical third of the buckle surface - it is a major characteristic of deciduous maxillary first molars
7. The crown is widest officially and tapers lingually - there is great cervical constriction

Question 25

Describe the roots of deciduous maxillary first molars

Answer 25

1. They have three Roots - two buccal and one lingual
2. They are long, slender, and flared
3. The lingual root is longer and more curved and tips back buccally at the Apex
4. The mesiobuccal root is the next longest - the disto buckle is the shortest and straightest
5. The root trunk try for case close to the cervical line, leaving a short root trunk
6. Each route has a single root canal

Question 26

Describe the identifying features of deciduous maxillary second molars

Answer 26

1. Resembles a permanent maxillary first molar, although it is much smaller
2. From the buccal, you can see two buccal cusps divided by a buccal groove
3. Deciduous second molar is much larger than a deciduous first molar in both crown and root formation
4. Buccal cusps are about equal in size
5. On the lingual, the crown shows three cusps- a mesiolingual, a distolingual, and a tubercle of carabelli (poorly developed and located on the lingual surface of the mesiolingual cusp)
6. A lingual developmental groove separates the mesolingual and distolingual cusps
7. A total of four well-developed cusps plus the cusp of carabelli
8. The developmental grooves, although less defined, are almost identical to those found on a permanent first molar
9. The mesiolingual cusp is the largest, and the distolingual cusp is the smallest (except for the fifth cusp)

Question 27

Describe the roots of deciduous maxillary second molars

Answer 27

1. Three roots - two buccal and one lingual
2. Lingual root is the longest and the distobuccal is the shortest
3. The mesiobuccal root may be as long as the lingual unlike the maxillary first molar
4. Short root trunk, and each of the roots has only one root canal

Question 28

Describe the identifying features of deciduous mandibular first molars

Answer 28

1. Does not resemble any of the other teeth, deciduous or permanent
2. It’s mesial outline is rather flat straight up and down, and the distal outline is convex, converging sharply toward the cervical outline
3. Two distinct buccal cusps are present, but the developmental groove between them is not always present
4. Mesial cusp is larger than the distal cusp
5. Crown has more width than depth
6. On the mesial half of the crown, the crown and root converge lingually
7. The mesial marginal ridge is so well developed that it almost appears to be another cusp
8. Buccally, the cervical line curves epically on the mesial half of the tooth
9. Pointed and long mesiolingual cusp
10. The most characteristic feature of this tooth is an extremely bulbous curvature on its buccal surface at the cervical third
11. This causes the occlusal table to appear rather narrow from cusp to cusp
12. The occlusal outline is rhomboidal
13. Has four cusps
14. A lingual groove radiates from the central pit between the mesiobuccal and mesiolingual cusps
15. Sometimes a facial grew friends from the central pit to the buccal surface between the two buccal cusps

Question 29

Describe the roots of deciduous mandibular first molars

Answer 29

1. Mandibular first molar has two roots - mesial and distal
2. They are flat, broad and flared widely apart
3. The mesial root has a longitudinal developmental groove running its length, and it has two root canals
4. The distal root is the shorter and thinner of the two - it only has one root canal

Question 30

Describe the identifying features of deciduous mandibular second molars

Answer 30

1. Resembles a permanent mandibular first molar except that it is smaller and has the typical deciduous molar construction at the cervix of the crown
2. The mesiobuccal and distobuccal developmental grooves divide the buckle surface occlusally into three cusps
3. All cusps are about equal in length and width - the distobuccal cusp is slightly longer than the other two
4. A short lingual groove can be seen dividing the two lineal cusps - the mesolingual and distilingual
5. The two lingual cusps are not as wide as the buccal cusps
6. The tooth converges lingually
7. Buccal surface shows a cervical bulge typical of deciduous molars
8. A mesial marginal ridge is more pronounced than a distal marginal ridge
9. The three buccal cusps are similar in size, as are the two lingual cusps
10. The mesiofacial, distofacial, and lingual grooves radiate from the central pit in a y shape
11. The crown converges both distally and lingually

Question 31

Describe the roots of deciduous mandibular second molars

Answer 31

1. The roots are twice as long as the crown
2. They’re long, slender, and flared
3. The root trunk, like all deciduous molars, is short, bifurcating immediately below the cervix of the tooth
4. The two roots are mesial and distal
5. The mesial root has two root canals and may have a longitudinal groove dividing it buccolingually
6. The distal root has only one root canal with no grooves to divide the root surface

Question 32

Describe the pulp cavities of deciduous teeth

Answer 32

1. The pulp cavities of deciduous teeth mirror the outer form of the teeth except for that of the pulp horns are longer and more pointed
2. The pulp chambers of deciduous teeth are large and proportioned to the tooth size and the pulp horns are more extreme
3. The mandibular deciduous molars are like miniature permanent teeth with larger sized pulp chambers, root canals, and pulp horns