Tooth M Midterm Flashcards
Ch 1-4
The marginal ridges and cingulum of the permanent maxillary central incisor are _________ than those of the permanent mandibular incisor
More prominent
When viewed from the proximal, which tooth and surface has the greatest curvature of its cervical line (cementoenamel junction) when compared to all other teeth in the mouth?
8, mesial surface
T/F The maxillary lateral incisor is smaller than the maxillary central incisor in all dimensions except root length
True
Though smaller than the maxillary incisors, mandibular incisors also have ____________ developmental lobes
4
Which incisor is considered the most symmetrical?
Mandibular central incisor
Viewed from the facial aspect the mandibular lateral incisor is ____________ mandibular central incisor
wider mesiodistally than the
Which (if any) of the following incisors has its mesial proximal contact at the same level incisocervically as its distal contact due to its symmetry?
Mandibular central incisor
Which statement is the most completely true regarding the wear patterns of the incisal edges of anterior teeth, assuming ideal occlusion?
Maxillary incisors are likely to exhibit wear on the lingual part of the incisal edge and mandibular incisors are likely to exhibit wear on the facial part of the incisal edge
When holding both an extracted maxillary and mandibular incisor from the same mouth, which characteristic will apply only to the MAXILLARY incisor?
The lingual anatomy is more prominent (marginal ridges pronounced and fossa deeper)
Which of the following characteristics is seen most of the time on ALL permanent incisors?
The root is longer than the crown
___________ are rounded incisal extensions of the labial lobes found on newly erupted or unworn permanent incisor teeth
Mamelons
Which incisors are most nearly identical in shape?
Mandibular right and left central incisors
From the following choices, which tooth has the shortest root relative to it’s crown?
Maxillary central incisor
All but one type of incisor has a mesioincisal angle more square (more acute) than the distal angle. Which is the EXCEPTION?
Mandibular central incisor
T/F Compared to the maxillary incisors, mandibular incisors have much more defined lingual anatomy
False
Which of the following characteristics are most likely to apply to the maxillary canine but NOT to the mandibular canine?
The crowns have prominent lingual ridges and fossa
When holding a maxillary and mandibular canine, which of the following characteristics will distinguish the mandibular canine?
The mandibular canine has a less prominent cingulum
The mesial side of a mandibular canine crown and root is relatively straight
The cusp tip of a mandibular canine is located lingual to the root axis line
On an unworn canine (maxillary or mandibular) the distal cusp ridge is __________than the mesial cusp ridge.
Longer
When viewed from the facial what is the geometric shape of the canine crown?
Pentagon shaped
The distal contact of the maxillary canine is located in the __________ of the crown.
Center of the middle third
With the long axis of the tooth vertical, which ridge is most nearly horizontal?
Mesial cusp ridge of the mandibular canine
The mesial contact of the maxillary canine is located in the _____________ of the crown
Junction of the incisal and middle third
Which of the following teeth are most likely to form from four lobes?
Maxillary central incisor
Mandibular lateral incisor
Maxillary canine
Mandibular canine
Which of the following is NOT normally a characteristic of a mandibular canine?
The mandibular canine cusp angle is sharper than the maxillary canine cusp angle
The depression found on the lingual of the maxillary canine and bounded by the lingual ridge, distal cusp ridge, distal marginal ridge, and the distal third of the cingulum is called the _________ __________.
distolingual fossa
Which statement(s) is/are true regarding the wear pattern of the incisal edges of anterior teeth (assuming ideal occlusion)?
Mandibular incisors are likely to exhibit wear on the facial part of the incisal edge
Which of the following characteristics is seen most of the time on ALL permanent incisors?
The root is longer than the crown.
The marginal ridges and cingulum of the permanent maxillary central incisor are _______ than those of the permanent mandibular incisor.
More prominent
How many teeth in the complete adult dentition have a labial surface?
12
Which incisors are most nearly identical in shape?
Mandibular right and left central incisors
In a mouth with ideal tooth alignment and in ideal occlusion, which surface of tooth #8 touches tooth #9? (The tooth numbers are using the Universal numbering system.)
Mesial
Compared to permanent maxillary lateral incisors, maxillary central incisors are more likely to exhibit:
The cingulum positioned distally
Using the international (Federation Dentaire) numbering system, a French dentist identified decay in tooth #21. What is the Universal number of that tooth that would be used when supplying information to an insurance company in the United States?
9
If two triangular ridges join, what is the entire ridge called?
Transverse ridge
One facial cusp of a premolar (or molar) has four ridges: a buccal ridge, a mesial cusp ridge, a distal cusp ridge, and a
Triangular ridge
In ideal tooth alignment, what surface of tooth #16 touches tooth #15?
Mesial
Which tooth crowns have the lingual crest of curvature (height of contour) located in the cervical third? (Read all choices before selecting the one best answer.)
All anterior teeth only
Which of the following is NOT one of the four cusp ridges (of the gothic pyramid) on the buccal cusp of a premolar?
Marginal ridge
Using the international (Federation Dentaire) numbering system, a French dentist identified decay in tooth #42. What is the Universal number of that tooth that would be used when supplying information to an insurance company in the United States?
26
Which tissue makes up the majority of the bulk of a tooth?
Dentin
Most buccal cusps have four ridges. Which ridge is NOT a part of a cusp?
Marginal ridge
Which of the following are the anatomic features of permanent maxillary central incisors?
- Cingula
- Mamelons
- Cusp ridges
- Marginal ridges
- Cervical lines
- Triangular ridges
1, 2, 4, 5
When referring to maxillary tooth surfaces, what term is the same as lingual?
Palatal
When referring to posterior tooth surfaces, what term can be used to refer to a buccal surface?
Facial
Which of the following is NOT a possible line angle of an incisor crown?
Mesiodistal line angle
Viewed from the facial aspect, the mandibular lateral incisor is _______ mandibular central incisor.
Wider mesiodistally than the
Which of the following characteristics is normally seen on ALL types of permanent incisors?
Facial and lingual crests of curvature are located in the cervical third.
When holding both any maxillary and mandibular incisor, which characteristic is most likely to apply to the mandibular incisor but not the maxillary incisor?
From the incisal view, the labiolingual dimension is greater than the mesiodistal dimension on mandibular incisors.
Which tooth has the shortest root relative to its crown?
Maxillary central incisor
The broadest (faciolingually) incisal or occlusal embrasure is normally found between which of the following permanent maxillary teeth?
First premolar and second premolar
Which two teeth have their mesial surfaces contacting one another? (Universal numbers are used here to denote the teeth.)
8 and #9
Which tooth structure is hardest (most calcified)?
Enamel
Which permanent incisor normally exhibits that the distal proximal crest of curvature is more cervical than the mesial height of contour?
Both maxillary central and lateral incisor
When referring to mandibular anterior tooth surfaces, what term may correctly be used to refer to a facial surface?
Labial
On incisors, the number of lobes on the facial surface (which is the same as the number of mamelons on the incisal surface) is:
3
When holding both an extracted maxillary and mandibular incisor from the same mouth, which characteristic will apply only to the maxillary incisor?
The lingual anatomy is more prominent (marginal ridges pronounced and fossa deeper).
In an adult mouth with ideal tooth alignment and in ideal occlusion, which surface of tooth #16 touches tooth #17? (The tooth numbers are using the Universal numbering system.)
Occlusal
When viewed from the proximal, which tooth (and surface) has the greatest curvature of its cervical line (cementoenamel junction) when compared to all other teeth in the mouth?
8, mesial surface
What is the general guideline for the location of the height of contour (crest of curvature) on most anterior teeth?
The facial and lingual heights of contour are both in the cervical third.
What two ridges make up the transverse ridge on most premolars?
Buccal triangular and lingual triangular ridges
Which statement is true regarding ALL incisor crowns?
When viewed from the proximal (mesial or distal), lingual outlines are S-shaped.
A transverse ridge is made up of which two ridges?
Two triangular ridges
The distal contact area of the permanent maxillary central incisor is located in the:
Junction of the incisal and middle thirds
All but one type of incisor have a mesioincisal angle more square (more acute) than the distal angle. Which type is the EXCEPTION?
Mandibular central incisor
The faciolingual length of a tooth can be measured when viewing the tooth from several views. Which view would NOT be appropriate when measuring the faciolingual dimension?
Labial
What is the correct order of anatomic landmarks of a tooth with two roots beginning at the cementoenamel junction and moving toward the root tip?
Cervix, trunk, furcation, apex
Which incisor is normally the narrowest (mesiodistally)?
Mandibular central incisor
The distal contact area of the permanent maxillary lateral incisor is located in the:
Center of the middle third
T/f: the maxillary lateral incisor is smaller than the maxillary central incisor in all dimensions except root length
True
With the long axis of the tooth vertical, which ridge is most nearly horizontal?
The mesial cusp ridge of the mandibular canine
Which characteristic is most likely to apply to the maxillary canine but NOT the mandibular canine?
The crowns have prominent lingual ridges and fossae
Which of the following is the longest root?
Root of the maxillary canine
Which of the following normally describes the general crown form of canines when viewed from the facial or lingual aspect?
Five sided
Where is the mesial contact of the permanent mandibular canine located?
Incisal third
T/f:The distinguishing characteristics of mandibular canines is the relatively straight line of the mesial outline, compared to the distal outline
True
t/f: maxillary canine roots are generally longer than lateral incisor roots and shorter than central incisor roots in the same dentition
False
All anterior teeth and two-cusped premolars form from how many lobes?
4
Which tooth is most likely to have two roots?
Maxillary first premolar
Which premolars are most likely to have three cusps and a lingual groove?
Mandibular second
Which premolar has a nonfunctioning lingual cusp?
Mandibular first
Which of the following traits does NOT apply to the maxillary first premolars?
The mesial proximal contact is located more cervically than is the distal proximal contact
When the maxillary first premolar has more than one root, which description applies?
There are most often two roots: a facial and a lingual
One permanent premolar has a pronounced concavity on the cervical part of the crown. Which premolar and which surface is this?
Mesial surface of the maxillary first premolar
When compared to other premolars, which of the following characteristics is unique to a mandibular first premolar?
There is likely to be a mesiolingual groove crossing onto the mesiolingual surface
Which of the following characteristics is NOT true about a maxillary first premolar?
The lingual cusp has little function because it is so short
Which premolar usually has a mesial crown depression (cavitation)?
Maxillary first premolar
Which permanent tooth has the mesial cusp ridge of its buccal cusp longer than the distal cusp ridge?
Maxillary first premolar
Which characteristic applies to ALL types of premolars?
All have the buccal crest of curvature more cervical than the lingual crest of curvature
Which premolar is most likely to have separate mesial and distal pits due to an extremely pronounced transverse ridge?
Mandibular first premolar
Which premolar is most likely to have three cusps?
Mandibular second premolar
If a mandibular second premolar has three cusps, what are they called?
Mesiolingual, Distolingual, and buccal
Which premolar has two major cusps almost the same size and length?
Maxillary second premolar
Which premolar is likely to be wider mesiodistally in the lingual half versus in the facial half?
Mandibular second premolar (three cusp type)
Which premolars are most likely to have the lingual cusp much shorter than the buccal cusp and have a mesiolingual groove?
Mandibular first premolar only
Which of the following permanent teeth most often form from five lobes but has only one root and three pulp horns?
Mandibular second premolar (three cusp type)
Which of the following teeth is most likely to have a central fossa and a lingual groove?
Mandibular second premolar
Compared to a maxillary first premolar, a maxillary second premolar is most likely to exhibit:
A shorter central groove
When viewed from the proximal which teeth are more likely to exhibit a lingual tilt of the crown relative to the root?
Mandibular premolars
Which of the following permanent teeth has a mesial marginal ridge more cervical than the distal marginal ridge?
Mandibular first premolar
A Y-shaped occlusal groove pattern is characteristic of a:
Mandibular second premolar
t/f: the central groove of the maxillary first premolar is short in the mesiodistal direction
False
t/f: the occlusal table of the mandibular first premolar is rectangular shaped
False
t/f: multiple secondary grooves often radiate from the central groove and pits of the maxillary second premolars
True
