Dental Anatomy. Chapter 12. Test 3

Question 1

What is the term for the permanent teeth that replace primary teeth?

Answer 1

succedaneous
[suhk-si-DAY-nee-uhs]

Question 2

What is the term for a tooth that does not replace a primary teeth?

Answer 2

non-succedaneous. The maxillary first mollars are the first permanent teeth to erupt into the maxillary arch. They erupt distal to the primary maxillary second mollars and thus they are non-succedaneous, meaning they do not replace the primary teeth.

Question 3

What is the term for the rounded, raised area on the cervical third of the lingual surface of anterior teeth (permanent)?

Answer 3

cingulum [SIN-gyuh-luhm]

Question 4

What effect do newly erupted central and lateral incisors (permanent) have on the incisal ridge?

Answer 4

Three Mamelons (rounded enamel extensions). These mamelons usually undergo attrition (wearing away of a tooth surface) shortly after eruption. attrition
[əˈtrɪʃn] - истощение, истирание

Question 5

Which teeth are the smallest ones in the permanent dentition?

Answer 5

The mandibular central incisors. And they are smaller than the maxillary incisors. This means that the mandibular canine is normally mesial to the maxillary canine. Supragingival tooth deposits, such as plaque, calculus, and stain, tend to collect in the lingual concavity of the mandibular incisors.

Question 6

What is the name for the developmental horizontal lines on the anterior teeth?

Answer 6

imbrication lines. The primary maxillary central incisors rarely have developmental depressions or imbrications lines.

Question 7

What feature borders the occlusal table of a posterior tooth?

Answer 7

The marginal ridges border the occlusal surface and create an inner occlusal table.

Question 8

What are the pinpoint depressions where two or more grooves meet?

Answer 8

Occlusal Developmental pits. Sometimes located in the deepest portions of the fossa. Each pit is a sharp pinpoint depression where two or more grooves meet.

Question 9

What are the two morphological forms of mandibular second premolars?

Answer 9

The three-cusp type, or tricanineate [try-kuh-NINE-ee-it] and the two-cusp type, or bicanineate. The more common three-cusp type consists of one large buccal cusp and two smaller lingual cusps.

Question 10

What is the term for a tooth with three roots?

Answer 10

trifurcated (means divided into thirds). try-FUR-kay-tid

Question 11

What is the name of the fifth cusp on a maxillary fist molar (permanent)?

Answer 11

the cusp of Carabelli. When present, this cusp is located lingual to the mesiolingual cusp. However, it often is so poorly developed that is scarcely [ˈskeəslɪ] distinguishable.

Question 12

Which teeth are referred to as the “wisdom” teeth?

Answer 12

Maxillary and mandibular third mollars

Question 13

How many roots do mandibular molars have?

Answer 13

The permanent mandibular molars have two roots, mesial and distal. Third molars often present with anomalies and position. A common anomaly is that the multiple roots are fused to form a single root.

Question 14

What method of identification is used in the Universal/National Tooth-Numbering System for the primary dentition?

Answer 14

The primary teeth are lettered with capital letters from A to T. Lettering begins with the upper right second primary molar (tooth A), works around to the upper left second primary molar (tooth J), drops to the lower left second primary molar (tooth K), and works around to the lower right second primary molar (tooth T).

Question 15

Do primary anterior incisors have mamelons?

Answer 15

No

Question 16

Which primary molar has an H-shaped groove pattern on the occlusal surface?

Answer 16

Maxillary first molar has an H-shaped groove pattern and three fossae: central, mesial triangular, and distal triangular.

Question 17

Which primary mandibular molar is the largest?

Answer 17

The primary mandibular second molar.

Question 18

What does morphology mean?

Answer 18

Morphology is study of form and shape, as of the teeth.

Question 19

fossa

Answer 19

an irregular depression or concavity found on the surface of a tooth. These depressions can vary in size and shape and are typically located on the occlusal (chewing) surfaces of posterior teeth or the lingual (tongue) surfaces of anterior teeth.

Question 20

prominent
[ˈprɒmɪnənt]

Answer 20

Видный, заметный.

Question 21

The incisal edges of Maxillary Central Incisors are formed at

Answer 21

labioincisal line angle and do not exist until an edge has been created by wear (before there the incisal ridge).

Question 22

The incisal edge is also known as

Answer 22

the incisal surface or incisal plane

Question 23

the incisal ridge

Answer 23

When an incisor is newly erupted, the incisal portion is rounded, this is called the incisal ridge.

Question 24

The crown of a maxillary lateral incisor has a single root that is …

Answer 24

relatively smooth and straight but may curve slightly distally (recognizing this feature is helpful in the mounting of radiographs). The maxillary lateral incisors are smaller than the central incisors in all dimensions except root length.

Question 25

A lingual pit on maxillary lateral incisors is …

Answer 25

a small depression or pit located on the lingual surface of the tooth. This pit is typically found near the cingulum, which is the raised area on the back of the tooth near the gum line. When a lingual pit is present, caries are more likely.

Question 26

diastema

Answer 26

Space or gap between two teeth (Unattractive unusually large open contacts). Often occur in the maxillary lateral incisors’ area because of the variations in tooth size and position in the arch plus they are often congenitally [kənˈʤenɪtlɪ] missing.

Question 27

pegged laterals

Answer 27

incisors with a pointed or tapered shape

Question 28

Supragingival

Answer 28

наддесневой

Question 29

subtle
[sʌtl]

Answer 29

тонкий, деликатный

Question 30

Characteristics of mandibular central incisors (permanent)

Answer 30

The mandibular central incisors are the smallest and simplest teeth and are bilaterally symmetric (teeth are almost mirror images of each other, and very similar in shape and size, making it difficult to distinguish between the two). The crown of a mandibular central incisor is narrower on the lingual surface than on the labial surface. Developmental horizontal lines on anterior teeth, or imbrication lines, and developmental depressions usually not present or very faint.

Question 31

Characteristics of mandibular lateral incisors (permanent)

Answer 31

The mandibular lateral incisors are slightly larger than the mandibular central incisors but otherwise similar to them.
The lateral teeth usually erupt after the mandibular central incisors.
The lateral incisors have a small, distally placed cingulum.
Greater height of the cementoenamel junction (CEJ) curvature on the mesial surface than on the distal surface helps distinguish the right mandibular lateral incisor from the left incisor.
There is less symmetry in these teeth than in the mandibular central incisors.
The mandibular lateral incisors have slightly larger roots than do the central incisors.

Question 32

cementum

Answer 32

Cementum is a specialized, calcified connective tissue that covers the roots of teeth.

Question 33

cementoenamel junction

Answer 33

The cementoenamel junction (CEJ) is the area on a tooth where the enamel, which covers the crown, meets the cementum, which covers the root.

Question 34

Characteristics of Permanent Anterior Teeth

Answer 34

All anterior teeth have a cingulum, a rounded, raised area on the cervical third of the lingual surface.
The cingulum corresponds to the lingual developmental lobe.
The lingual surface on anterior teeth has rounded, raised borders on the mesial and distal surfaces called marginal ridges.
Some anterior teeth have a fossa, which is a wide, shallow depression on the lingual surfaces.

Question 35

Characteristics of Maxillary Central Incisors (permanent)

Answer 35

Maxillary central incisors have unique anatomical features.
Larger in all dimensions, especially mesiodistally, than a permanent mandibular central incisor.
Labial surfaces are more rounded from the incisal aspect, with the tooth tapering toward the lingual.
Root is short compared with the roots of other permanent maxillary teeth.
All lingual surface features, including the marginal ridges, lingual fossa, and cingulum, are more prominent on the maxillary central incisor than on the mandibular central incisor.

Question 36

Characteristics of Maxillary Lateral Incisors (permanent)

Answer 36

The maxillary lateral incisors are smaller than the central incisors in all dimensions except root length.
They usually erupt after the maxillary central incisors.
The crown of a maxillary lateral incisor has a single root that is relatively smooth and straight but may curve slightly distally.
Because of the variations in form, the permanent maxillary lateral incisors present challenges during preventive, restorative, and orthodontic procedures.

Question 37

Characteristics of Permanent Canines

Answer 37

Patients often complain of the normal slightly deeper yellow color of their canines compared with their incisor teeth.
“Cuspid” is an older term that has been used in place of canine.
The permanent canines are the longest teeth in the dentition .
The root is usually the length of the crown.
Patients commonly call the canines their “eye teeth”.

Question 38

canine eminence

Answer 38

This is the bony ridge over the labial portion of the roots of the canines that forma facial contour.

Question 39

Characteristics of Maxillary Canines (pemanent)

Answer 39

The maxillary canines) usually erupt after the mandibular canines, after the maxillary incisors, and possibly after the maxillary premolars.
The cusp tip is sharper on a maxillary canine.
The mesial cusp slope is usually shorter than the distal cusp slope in both the maxillary and the mandibular canines when they first erupt.
The length of these cusp slopes, and the cusp tip can change with attrition
The maxillary canine is narrower than the central incisor.
The maxillary canines may erupt labially or lingually in relation to the surrounding teeth.
The maxillary canines may also fail to erupt fully and may remain impacted.
This occurs because the permanent maxillary canines erupt after the maxillary incisors and possibly after the premolars and their arch spaces have closed.

Question 40

Characteristics of Mandibular Canines (permanent)

Answer 40

The mandibular canines usually erupt before the maxillary canines and after most of the incisors have erupted.
A mandibular canine closely resembles a maxillary canine.
Although the entire tooth is usually as long, a mandibular canine is narrower labiolingually and mesiodistally than a maxillary canine.
The lingual surface of the crown of the mandibular canines is smoother than that of the maxillary canines and has a less developed cingulum and two marginal ridges.
Lower permanent canines on occasion have a bifurcation near the apex, resulting in two short roots.

Question 41

inclined cuspal planes of posterior permanent dentition

Answer 41

Imagine each cusp as a mountain with sloping areas, or cusp ridges, extending from the top of the mountain; between the ridges are sloping areas called inclined cuspal planes

Question 42

Characteristics of Posterior Permanent Dentition

Answer 42

Each shallow, wide depression on the occlusal table is a fossa.
One type of fossa on posterior teeth, the central fossa,
is located where the cusp ridges converge in a central point, where the grooves meet on a posterior tooth.
Another type of fossa is the triangular fossa.
Associated with the termination of triangular grooves.
Sometimes located in the deepest portions of the fossa are occlusal developmental pits.
Each pit is a sharp pinpoint depression where two or more grooves meet.

Question 43

Developmental grooves

Answer 43

Marginal groove
Is a developmental groove that allows food to escape during mastication.

Central groove
Prominent
Travels mesiodistally, and divides the occlusal table in half

Question 44

How do occlusal pits relate to the fossa on the tooth?

Answer 44

Sometimes located in the deepest portions of the fossa are occlusal developmental pits. Each pit is a sharp pinpoint depression where two or more grooves meet. Also, occlusal pits are connected with a triangular fossa via a marginal groove.

Question 45

sealant
[ˈsiːlənt]

Answer 45

герметик, уплотнитель

Question 46

Characteristics of Maxillary First Premolars

Answer 46

A maxillary first premolar is larger than a maxillary second premolar.
Both maxillary premolars erupt earlier than the mandibular premolars.

Each maxillary first premolar has two cusps (buccal and lingual).
The buccal cusp is the larger of the two cusps.

The maxillary first premolar has a bifurcated root (two roots: one buccal and one lingual).
Some first premolars have roots that are joined, or fused.
Most upper premolars have two roots; fewer than one fifth present with a single root.
The roots are shorter in length and resemble the roots of the molars.
In contrast to the roots, the crowns of the first premolars may closely resemble those of the canines.

The maxillary and mandibular premolars work with the molars in the chewing of food.
The first premolars help the canines in shearing or cutting bits of food.

Question 47

Characteristics of Maxillary Second Premolars (permanent)

Answer 47

Each maxillary second premolar has two cusps (buccal and lingual) and one root.
The buccal cusp is shorter, less pointed, and more rounded than the first.

Question 48

Differences Between Second and First Maxillary Premolars

Answer 48

The cusps are closer in length on the second premolar (the lingual cusp is slightly shorter, but not as short as the cusp on the maxillary first premolar)
The mesiobuccal cusp slope is shorter than the distobuccal cusp slope on the second premolar.
The cusps of the secondary premolar are not as sharp as those of the maxillary first premolar.
The second premolar has only one root and one root canal.
The second premolar has a slight depression on the mesial root.
The second premolar is wider buccolingually than mesiodistally.
In most facets, second premolars are similar to but less defined than first premolars.
Many features tend to be more rounded in second premolars.

Question 49

Characteristics of Mandibular First Premolars

Answer 49

Each mandibular first premolar has a long and well-formed buccal cusp and a small, nonfunctioning lingual cusp.
The lingual cusp may be no larger than the cingulum on some maxillary canines.
The mandibular first premolars are smaller and shorter than the mandibular second premolars.
The lingual cusp of this tooth is the smallest of any tooth.

Question 50

Characteristics of Mandibular Second Premolars

Answer 50

They are the succedaneous replacements for the primary mandibular second molars.
Mandibular second premolars tend to be larger than the mandibular first premolars, but the buccal cusp in these teeth is less pronounced.
This tooth is one of those most frequently missing as a result of heredity or congenital factors.
There are two forms of the mandibular second premolar:
Three-cusp type (tricuspidate form) or tricanineate form and Two-cusp type (bicuspidate form) or bicanineate form.
In tricanineate premolars, the groove pattern is typically Y-shaped. In the two-cusp type, the groove pattern may be U-shaped (also called C-shaped) or H-grooved, depending on whether the central developmental groove is straight mesiodistally or curved buccally at its ends.

Question 51

Characteristics of Permanent Molars

Answer 51

The molar crowns have four or five short, blunt cusps, and each molar has two or three roots that help support the larger crown.
In most individuals, lower molars have two lingual cusps, whereas upper permanent molars present with two buccal cusps.
Lower molars generally have two roots, whereas upper molars generally have three roots.
The name molar comes from the Latin word for “grinding”
There are three types of molars: First, second, and third
The first and second molars are also called the 6-year and 12-year molars because of the approximate ages at which they erupt.
The permanent molars are the largest teeth in the dentition.
Molar teeth are not preceded by primary teeth.

Question 52

Characteristics of Maxillary Molars (permanent)

Answer 52

Usually the first permanent teeth to erupt into the maxillary arch.
Each maxillary molar usually has four major cusps, with two on the buccal portion of the occlusal table and two on the lingual.
Each maxillary molar has three well-separated and well-developed roots.
A tooth with three roots is said to be trifurcated, which means “divided into thirds”.
The distal of the maxillary first molar and mandibular central incisors are prone to periodontitis. The parotid gland exits near this tooth as well, so there is often supragingival calculus on the distobuccal surface.
The roots of the maxillary molars may penetrate the maxillary sinus as a result of accidental trauma or during an extraction.
The roots of the maxillary molars are close to the sinuses, causing some patients to confuse the pain caused by a sinus infection with pain related to their maxillary teeth, and vice versa.

Question 53

periodontitis

Answer 53

Periodontitis, also known as gum disease, is a serious infection that damages the soft tissue and bone supporting the teeth. If left untreated, it can lead to tooth loss.

Question 54

supragingival calculus

Answer 54

Supragingival calculus, also known as tartar, is a hardened deposit that forms on the exposed surfaces of the teeth, particularly along the gum line. It is composed of mineralized dental plaque, which includes calcium and phosphate minerals from saliva, along with organic matter and bacterial debris.

Question 55

trifurcation

Answer 55

the area at which three roots divide.

Question 56

a root concavity

Answer 56

a natural indentation or groove found on the surface of a tooth’s root. These concavities can vary in depth and are most commonly found on the roots of molars and premolars. They play a significant role in the stability and anchorage of the tooth within the jawbone.

Question 57

Characteristics of Maxillary First Molars (permanent)

Answer 57

The maxillary first molars are the first permanent teeth to erupt into the maxillary arch.
The maxillary first molar is the largest tooth in the maxillary arch and also has the largest crown in the permanent dentition.
This molar is composed of five developmental lobes, two buccal and three lingual. The fifth cusp is called the cusp of Carabelli.
Because of the typical age at the eruption of these teeth, children and parents may need to be told that the maxillary and mandibular first molars are permanent dentition.

Question 58

Characteristics of Maxillary Second Molars (permanent)

Answer 58

The crown of the maxillary second molar is somewhat shorter than that of the first molar, and it usually has four cusps.
There are three roots.
The roots of the secondary molars are smaller than those of the first molars.
The lingual root is still the largest and longest.
The buccal groove is located farther distally on the buccal surface of the second maxillary molar than on the first maxillary molar.
The mesiobuccal cusp of the second maxillary molar is longer and has a more blunt cusp tip than the distobuccal cusp.
Differences in cusp size are more noticeable on the maxillary second molars than on the first.
The roots of the second molars are close together and sometimes fuse.

Question 59

Characteristics of Maxillary Third Molars

Answer 59

The maxillary third molars differ considerably in size and contour.
The crown of the maxillary third molar is smaller and the roots are usually shorter.
The roots of the maxillary third molar tend to fuse, and the result is a single tapered root.
Maxillary third molars show more variation in morphology than do other teeth.
These teeth are the most likely to be missing as a result of heredity or congenital causes.

Question 60

Characteristics of Mandibular Molars (permanent)

Answer 60

The mandibular molars erupt 6 months to 1 year before the corresponding permanent maxillary molars.
The crowns of the mandibular molars have four or five major cusps, with two lingual cusps always of about the same width.
All mandibular molars are wider mesiodistally than buccolingually, similar to anterior teeth.
The lingual cusps tend to be longer and sharper than the buccal cusps.
Each mandibular molar has two well-developed roots, one mesial and one distal.
The mesial root is wider than the distal one.
The two roots are generally the same length.
The lingual inclination of the crowns of the mandibular molars can make it difficult to position the oral evacuator.
The lingual inclination of the molar teeth can also pose problems in oral hygiene for patients, who may miss the lingual gingiva with the toothbrush.

Question 61

Characteristics of Mandibular First Molars (permanent)

Answer 61

The permanent mandibular first molars erupt between 6 and 7 years of age.
These teeth are commonly the first permanent teeth to erupt in the oral cavity.
The two roots, mesial and distal, of a mandibular first molar are larger and more divergent than those of a second molar.
When this molar has three roots, the mesial root has both buccal and lingual branches.

Question 62

lingual inclination

Answer 62

the angle at which the crowns of teeth tilt towards the tongue. This is a common feature in the alignment of teeth, particularly in the posterior teeth (molars and premolars).

Question 63

Characteristics of Mandibular Second Molars (permanent)

Answer 63

The mandibular second molars erupt between 11 and 12 years of age.
The crown of the mandibular second molar is slightly smaller than that of the first molar in all directions.
The crown has four well-developed cusps.
Roots on the second molars tend to be shorter than those on the first molars.
A fifth cusp is seen in rare cases.

Question 64

Characteristics of Mandibular Third Molars

Answer 64

The mandibular third molars are similar to the maxillary third molars in that they vary greatly in shape.
There is no typical mandibular third molar.
This molar is usually smaller in all dimensions than the second molar.
The third molar consists of four developmental lobes.
A mandibular third molar has two roots that are fused, irregularly curved, and shorter than those of a mandibular second molar.
The crown of the mandibular third molar tends to be more rounded than that of a first or second molar.
Four or five cusps may be present.

Question 65

Characteristics of Primary Dentition

Answer 65

The crown of any primary tooth is short in relation to its total length
The crowns are narrower at the cementoenamel junction (CEJ).
The pulp chambers and pulp horns in primary teeth are relatively large compared with those of the permanent teeth.
There is a thick layer of dentin between the pulp chambers and the enamel, especially in the primary mandibular second molar.
The enamel layer is relatively thin.
In addition to normal tooth function, the key role of the primary dentition is to maintain proper spacing for the eruption of the permanent dentition.
It is for this reason, more than others, that proper care of the primary dentition is so important.
Because the enamel and dentin are thinner in primary teeth, decay can travel quickly through the enamel to the pulp, possibly causing loss of the tooth.
In the primary dentition it is particularly important to retain the second molars. If these teeth are lost, the first permanent molars are likely to drift out of position

Question 66

Characteristics of Primary Incisors

Answer 66

The crowns and roots of deciduous incisors are smaller than those of their permanent successors.
The roots are twice as long as the crowns and taper toward the apex.
If a primary incisor is lost prematurely, a space maintainer is not fabricated. However, if a primary molar is lost, a space maintainer may be fabricated to prevent space loss and ensure adequate room for the adult premolars.

Question 67

Characteristics of Primary Maxillary Central Incisors

Answer 67

The crown of the primary maxillary central incisor (E and F) is wider mesiodistally than incisocervically.
It is the only tooth of either dentition with this crown dimension.
The cingulum and marginal ridges are more prominent than they are on the permanent successor, and the lingual fossa is deeper.

Question 68

Characteristics of Primary Maxillary Lateral Incisors

Answer 68

The crown of the primary maxillary lateral incisor (D and G) is similar to that of the central incisor but much smaller in all dimensions.
The incisal angles on the lateral incisor are also more rounded than on the central incisor.
The lateral root is longer in proportion to its crown, and its apex is sharper.

Question 69

Characteristics of Primary Mandibular Central Incisors

Answer 69

The crown of the primary mandibular incisor (O and P) resembles the primary mandibular lateral incisor more than it does its permanent central successor
The mandibular central incisor is extremely symmetric.
It is also not as constricted at the CEJ as is the primary maxillary incisor.
The lingual surface of the mandibular central incisors appears smooth and tapers toward the prominent cingulum.
The crown of the mandibular central incisor is slightly bigger than that of the permanent lateral incisor.

Question 70

Characteristics of Primary Mandibular Lateral Incisors

Answer 70

The crown of the primary lateral incisor (Q and N) is similar in form to that of the central incisor in the same arch but is wider and longer.
The incisal edge of the mandibular lateral incisor slopes distally, and the distoincisal angle is more rounded.
The root may have a distal curvature in its apical third and usually has a distal longitudinal groove.

Question 71

Characteristics of Primary Canines

Answer 71

Differ from the outline of their permanent successors in the following ways:
Maxillary canines:
- The crown of the primary maxillary canine (C and H) has a relatively longer and sharper cusp than that of its permanent successor on eruption.
- The mesial and distal outlines of the primary maxillary canine are rounder.
The primary canines are sometimes removed to allow other teeth to align properly.

Question 72

Characteristics of Primary Mandibular Canines

Answer 72

The primary mandibular canine (M and R) resembles the primary maxillary canine, but this tooth is much smaller labiolingually.
The distal cusp slope is much longer than the mesial cusp slope.
The lingual surface of the primary mandibular canine is marked by a shallow lingual fossa.

Question 73

Characteristics of Primary Molars

Answer 73

Each molar crown is wider than it is tall.
Primary teeth are smaller than their permanent successors and have relatively larger pulp chambers. It is important that caries be treated promptly in order to prevent exposure of the pulp.

Question 74

exfoliation

Answer 74

refers to the natural process of shedding or losing primary (baby) teeth

Question 75

Characteristics of Primary Maxillary First Molars

Answer 75

The crown of the primary maxillary first molar (B and I) does not resemble any other crown of either dentition.
The height of contour on the buccal surface is at the cervical third of the tooth; on the lingual side, it is at the middle third.
The primary maxillary molars have three roots, which are thinner and have greater flare than do those of the permanent maxillary first molar.
The lingual root is the longest and most divergent.
The crown of the first maxillary molar is the smallest found in the primary molars.

Question 76

Characteristics of Primary Maxillary Second Molars

Answer 76

Closely resembles the permanent maxillary first molar but is smaller in all dimensions
The second molar usually has a cusp of Carabelli, the minor fifth cusp.

Question 77

Characteristics of Primary Mandibular First Molars

Answer 77

The crown of the primary mandibular first molar (L and S) is unlike any other tooth of either dentition.
The height of contour on the buccal surface is at the cervical third of the tooth; on the lingual side, it is at the middle third.
Has four cusps; the mesial cusps are larger.
Has two roots, which are positioned similarly to those of other primary and permanent mandibular molars.
The mesial cusps are the highest and largest on any tooth.

Question 78

Characteristics of Primary Mandibular Second Molars

Answer 78

The primary mandibular second molar (K and T) is larger than the primary mandibular first molar.
Most closely resembles in form the permanent mandibular first molar.
The three buccal cusps are nearly equal in size, however, and the primary mandibular second molar has an oval occlusal shape.

Question 79

Which tooth erupts first in the primary dentition?

Answer 79

mandibular central incisors

Question 80

Which tooth exfoliated last in the primary dentition?

Answer 80

The mandibular second molars

Question 81

What is the problem with undercontoured and overcontoured teeth?

Answer 81

Undercontoured teeth lead to tissue trauma during mastication.

Overcontoured teeth retain plaque that leads to inflammation.

Question 82

Triangular groove

Answer 82

developmental groove that separates a marginal ridge from the triangular ridge if a cusp

Question 83

Which teeth have two or three roots?

Answer 83

Maxillary first premolars have two roots.
Maxillary molars typically have three roots .
Mandibular molars usually have two roots.