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Anatomy > Anatomy - Obj. 1.6 to 1.8 (week 2 pp) > Flashcards

Anatomy - Obj. 1.6 to 1.8 (week 2 pp) Flashcards

1
Q

How many surfaces on each tooth

A

Each tooth has five
surfaces: facial, lingual,
masticatory, mesial,
and distal surfaces.

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2
Q

Facial Surface

A

The tooth surface
closest to the surface of
the face is termed
facial

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3
Q

Labial Surface

A

The tooth surface
closest to the surface of
the face is termed
facial

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4
Q

Buccal surface

A

The facial surface
closest to the inner
cheek is termed buccal.

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5
Q

lingual surface

A

The surface closest to
the tongue is termed
lingual.

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6
Q

palatal surface

A

The lingual surfaces
closest to the palate on
the maxillary arch is
sometimes also termed
palatal.

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7
Q

one rooted teeth

A

incisors, cuspids/canines, premolars/bicuspids

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8
Q

two rooted teeth

A

mandibular molars

1st maxi premolar can be bifurcated

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9
Q

three rooted teeth

A

maxillary molars

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10
Q

proximal surfaces

A

surfaces next to each other when teeth are adjacent in in the arch (both mesial and distal)

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11
Q

interproximal surfaces

A

area between two adjacent teeth

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12
Q

anatomic features of the teeth help…

A

Anatomic features of the teeth help maintain their positions in the arch and protect the tissues
during mastication (chewing)

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13
Q

Three anatomic features of the teeth

A

◦ Contours
◦ Contacts
◦ Embrasures

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14
Q

Contours of teeth

A

All teeth have a curved surface except when the
tooth is fractured or worn
◦ Some surfaces are convex; others are concave
◦ General principle that the crown of the tooth narrows
toward the cervical line is true for all types of teeth

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15
Q
  • Facial and lingual contours
A

◦ The normal contour of a tooth provides the gingiva with adequate stimulation for health, while protecting it from damage that may be caused by food

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16
Q
  • Mesial and distal contours
A

These contours provide normal contact and embrasure form

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17
Q

height of contours

A

The “bulge,” or widest point, on a specific surface of the crown
* Contact areas on the mesial and distal surfaces are usually considered the height of contour on the proximal surfaces
* Facial and lingual surfaces also have a height of contour

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18
Q

Contact area

A

The area where the
crowns of adjacent
teeth in the same arch
physically touch on
each proximal surface is
the contact area, or, as
referred to by clinicians,
the contact

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19
Q

A proper contact serves the following purposes:

A

◦ Prevents food from being trapped between the teeth
◦ Stabilizes the dental arches by holding the teeth in either arch in positive contact with each other
◦ Protects the interproximal gingival tissue from trauma during mastication (chewing)

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20
Q

Embrasures

A
  • When two teeth in the same arch touch, their curvatures next to the contact areas form spaces called embrasures
  • An embrasure is a triangular space in a gingival direction between the proximal surfaces of two adjoining teeth in contact * Embrasures are continuous with the interproximal
    spaces between the teeth
  • All tooth contours, including contact areas and embrasures, are important in the function and health of the oral tissues
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21
Q

apical embrasure

A

embrasure on anterior teeth near gingiva (gums)

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22
Q

incisor embrasure

A

embrasure at incisal edge

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23
Q

lingual embrasures

A

embrasure on the lingual surface of all teeth

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24
Q

facial embrasures

A

embrasure on buccal and labial surface of teeth

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25
Q

occlusal embrasures

A

embrasures on occlusal surface of posterior teeth

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26
Q

clinical considerations for tooth surfaces

A
  • The tooth’s angles, height of contour, and spaces define the front or face of a tooth when the design of a patient’s smile is considered, because these features are noted first when contemplating
    someone’s smile.
  • Altering placement and shape of these features changes the face of a tooth and its perceived size and the appearance of the smile.
  • Note that ideally the mesial part of the face and silhouette of a tooth is more angled vertically than the distal part of the face of a tooth
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27
Q

cusp

A

major elevation on the occlusal surfaces of canine and posterior teeth

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28
Q

Developmental
depressions

A

Developmental
depressions outline the
separations among the
labial developmental
lobes

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29
Q

cingulum

A

The lingual surfaces of
all anteriors have a
cingulum.

A raised, rounded area
on the cervical third of
the lingual surface

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30
Q

mamelons

A

small bumps on incisor incisal edges - usually appear on recently erupted adult teeth and are worn away with use/grinding

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31
Q

anterior developmental groove

A

Anteriors may have on
their lingual surface a
developmental groove
- A sharp, deep,
V-shaped linear
depression that marks
the junction among the
developmental lobes

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32
Q

posterior developmental grooves

A

The developmental
grooves on each
different posterior
tooth type are located
in the same place and
mark the junction
among the
developmental lobes

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33
Q

types of developmental grooves

A

-central groove
-supplemental groove (or secondary groove)
may also be present on the lingual surface of anterior teeth
-triangular groove
-marginal groove

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34
Q

fossa

A

a shallow, wide
depression.

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35
Q

developmental pits

A

are located in the
deepest part of each
fossa.

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36
Q

occlusal pit

A
  • Each occlusal pit is a
    sharp pinpoint
    depression where two
    or more grooves meet
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37
Q

Posterior marginal ridge

A

The crown of each
posterior tooth has an
occlusal surface that is
bordered by the raised
marginal ridges

  • Located on the distal
    surface and mesial
    surface
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38
Q

anterior marginal ridge

A

Present on the lingual
surface.
The lingual surface on anteriors is bordered
mesially and distally on each side by a rounded raised border

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39
Q

Triangular ridges

A

Triangular ridges, are cusp ridges that
descend from the cusp tips toward the central part of the occlusal table

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40
Q

transverse ridge

A

Additionally present on
many posteriors is a
transverse ridge

A term given to the
joining of two
triangular ridges
crossing the occlusal
table transversely, or
from the labial to
lingual

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41
Q

incisal ridge

A

The long crown of an
anterior tooth has an
incisal surface, which is
considered the incisal
ridge

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42
Q

features of the face: ala of the nose

A

◦ wing - outer nostril

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43
Q

features of the face: Tragus of the ear

A

Projection anterior to the external opening of the ear

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44
Q

Ala-tragus line

A

◦ Used to landmark for x-rays

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45
Q

features of the face

A
  1. Outer canthus of the eye
  2. Inner canthus of the eye
  3. Ala of the nose - wing/outernostril
  4. Philtrum - cupids bow
  5. Tragus of the ear
  6. Nasion - between eyebrows
  7. Glabella - middle of forhead
  8. Bridge of the nose
  9. Septum
  10. Anterior naris - nostril-ish
  11. Mental protuberance - chin
  12. Angle of the mandible - jawline
  13. Zygomatic arch - cheekbone
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46
Q

labial commisure

A

corners of lips/mouth

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47
Q

vermillion border

A

outside border of lips

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48
Q

vermillion zone

A

inside of border of lips

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49
Q

vestibule

A

The vestibule is the space between the
teeth and the inner mucosal lining of the
lips and cheeks.

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50
Q

oral cavity proper

A

The oral cavity proper is the space on
the tongue side within the upper and
lower dental arches (Bird & Robinson,
2020).

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51
Q

linea alba

A
  • white ridge of raised tissue extends horizontally at the level where the maxillary and mandibular teeth come together
  • Caused by friction
    with the teeth
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52
Q

Fordyce spots

A
  • are normal small, yellowish elevations that may appear on the buccal mucosa
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53
Q

mucogingival junction

A

A distinct line of color change where the alveolar mucosa meets with attached gingivae

  • The attached gingiva is a lighter color and has a stippled surface
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54
Q

alveolar mucosa

A

Covers the alveolar
bone

  • Loosely attached to the
    bone
  • Redder in colour than
    labial or buccal mucosa
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55
Q

frenum/frenulum

A
  • They are found at the inner midline of both upper and lower lips and by the cuspid or bicuspid areas
  • It is a narrow fold of mucous membrane passing from fixed tissue to more movable tissue
  • The frena/frenula attach the lips to the alveolar mucosa and the tongue to the floor of the mouth
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56
Q

gingiva (gums)

A

Gingiva surrounds the tooth like a collar and is self-cleansing.
* Gingiva is firm and resistant and can be tightly
adapted to the tooth and bone.
* Surfaces of the attached gingiva and interdental
papillae are stippled and resemble the rind of an orange.
* The color of the gingival surface varies according to the individual’s pigmentation

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57
Q

attached gingiva

A

The attached gingiva
extends from the base
of the sulcus to the
mucogingival junction.

  • It is a stippled, dense
    tissue that is selfprotecting, firmly
    bound, and resilient
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58
Q

Bony eminence

A

-raised contour of bone that
follows the roots of the teeth, canine eminence

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59
Q
  • Maxillary tuberosity
A

-small extension of bone
posterior to last maxillary tooth

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60
Q
  • Retromolar area
A

bone posterior to last
mandibular tooth-we will discuss this in more
detail when we detail the mandible

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61
Q

exostoses

A

Localized growth of
bone

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62
Q

hard palate

A

roof of mouth
* Crush food
* Assist in swallowing
* Prevent injury to the oral structures by determining
texture and temperature of food (Bird & Robinson,
2021)
Hard Palate
(A) Surface features of th

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63
Q

soft palate

A

Posterior third of the palate
* Composed of muscular fibers covered with mucosa
* The most posterior portion is the uvula
* The soft palate assists by closing off the nasal cavity during swallowing or speaking – specifically the uvula

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64
Q

Oropharynx

A

The middle part of the throat, behind the mouth.

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65
Q

tongue - dorsum

A
  • The upper surface is
    the dorsum
66
Q

tongue - ventral surface

A
  • The undersurface is the
    ventral surface
  • Large visible blood
    vessels and deep
    lingual veins
  • Plica fimbriata/e
67
Q

tongue - depression down

A
  • The depression down
    the midline is the
    median sulcus
68
Q

tongue - Circumvallate/Vallate Papillae

A
  • Is a V-shaped row of circular, raised papillae
    about 2/3 of the way back
  • Involved in your gag reflex.
  • Contain taste buds
69
Q

Filiform Papillae

A
  • grey threadlike projections of epithelial tissue
  • cover the anterior 2/3rds of the tongue
  • provide tactile sense
70
Q

Fungiform Papillae

A
  • reddish small mushroom-shaped dots
  • dorsal surface
  • anterior 2/3rds of the tongue
  • Contain taste buds
71
Q

Foliate Papillae

A
  • on lateral surface, back in the region of the
    circumvallate papillae
  • some taste buds
72
Q

lingual tonsils

A
  • Found near the midline, on the dorsum of the tongue
  • Directly behind the circumvallate papilla
  • Similar to the tissue of palatine tonsils
  • Works as a defense mechanism in that area
73
Q

Masticatory Mucosa

A

oral mucosa that covers the hard palate, dorsum of the tongue, and gingiva

74
Q

specialized mucosa

A

mucous membrane on the tongue in the form of
lingual papillae, which are structures associated
with sensations of taste

75
Q

lining mucosa

A

mucous membrane that covers the inside of the cheeks, vestibule, lips, soft palate, and underside
of the tongue and acts as a cushion for underlying structures

76
Q

Universal Numbering System (UNS)

A

This system is the most widely used in the United States for the designation of both dentitions, because it is adaptable to electronic data

-the primary teeth are designated from each other in a consecutive arrangement by using capital letters, A through T, starting with the maxillary right second molar, moving clockwise, and ending
with the mandibular right second molar

  • The permanent teeth are designated from each other in the UNS in consecutive arrangement as the patient is observed from in front by using the digits 1 through 32, starting with the maxillary
    right third molar, moving clockwise, and ending with the mandibular right third molar.
77
Q

FDI - International Numbering System

A
  • However, the need for a system that can be used
    internationally, as well as by electronic data
    transfer, is recognized; thus the acceptance of the
    International Numbering System (INS) * This is based on the system of the Fédération
    Dentaire Internationale (FDI
  • the teeth are designated from each other by using a two-digit code.
  • The first digit of the code indicates the quadrant, and the second indicates the tooth’s position in this quadrant.
  • the digits 1 through 4 are used for quadrants in a clockwise manner in the permanent dentition, and digits 5 through 8 are used in a clockwise manner for those quadrants of the primary dentition
    he teeth are designated from each other by usinga two-digit code.
  • The first digit of the code indicates the quadrant, and the second indicates the tooth’s position in this quadrant.
  • The digits 1 through 4 are used for quadrants in a clockwise manner in the permanent dentition, and digits 5 through 8 are used in a clockwise manner for those quadrants of the primary dentition
78
Q

palmer method

A
  • In this system, the teeth are designated from each other with a right-angle symbol indicating the quadrants and arch, with the tooth number placed inside
79
Q

maxillary labial frenum

A

middle frenum on top arch

80
Q

mandibular labial frenum

A

middle frenum on bottom arch

81
Q

mandibular buccal frenum

A

frenums near cuspid teeth on bottom arch

82
Q

sublingual fold

A

fold on ventral side of tongue

83
Q

lingual frenum

A

frenum under the tongue

84
Q

mandibular tori

A

localized growth of bone under tongue - on the sides of floor of mouth

85
Q

FOM - Floor of mouth

A

under the tongue

86
Q

primary dentistion

A

There are 20 primary teeth: 10 in the maxillary arch and 10 in the mandibular arch
* Includes incisors, canines, and molars
* Numbered in the FDI System by quadrants (5-8)

87
Q

incisive papilla

A

right behind central incisors on roof of mouth

88
Q

palatal ruguae

A

bumps/ridges distal to incisive papilla, on roof of mouth

89
Q

medial palatine raphe (or suture)

A

center of roof of mouth - where 2 bones meet/come together (under the mucosa)

90
Q

palatal torus

A

deviation of normal - boney over growth/bump on roof of mouth

91
Q

Dentition periods

A

primary
mixed
permanent

92
Q

primary teeth

A

baby or deciduous teeth - 20 total, 10 maxi & 10 mandi
includes incisors, canines/cuspids & molars (no premolars)
numbered in FDI system by quads 5-8
1st tooth usually erupts around 6 months of age

93
Q

Mixed dentition

A
  • Mixed dentition generally occurs between the ages of 6 and 12 years
  • Both primary and permanent teeth are present during this transitional period
  • The mixed dentition period begins with the eruption of the first permanent tooth, which is a permanent mandibular first molar
  • This period ends with shedding of the last primary tooth
94
Q

permanent dentition

A

The final, or adult, dentition
* This period begins with shedding of the last primary tooth
* Growth of the jawbones slows and eventually stops
* There is very little growth of the jaw overall during this period because puberty has passed

95
Q

primary teeth eruption

A
  • The actual dates are
    not as important as the eruption sequence,
    because there can be a great deal of variation in the actual dates of
    eruption.
  • However, the sequence
    tends to be uniform
    *The primary dentition
    takes between 2 and 3
    years to be completed
96
Q

primary teeth eruption sequence

A

Eruption begins mandibular central incisor at approximately 6 months.

RULE: mn > mx

a) 1’s 6-10 months

b) 2’s 7-10 months/9-12 months

c) 4’s 12 -18 months

d) 3’s 16-22 months

e) 5’s 20-32 months/24-32 months

Sequence 1, 2, 4, 3, 5

97
Q

primary to permanent teeth comparision

A
  • The crown of any primary tooth is short
    in relation to its total length
  • It is also narrower, at the cementoenamel
    junction (CEJ), making them appear bulbous
    ** Roots of primary teeth are also narrower and longer than the crown length.
    *Each crown-to-root ratio of primary teeth is smaller than those ratios of their
    permanent dentition counterparts
    *primary teeth are typically more white
    *primary teeth have prominent cervical ridge
    *primary teeth are smaller overall
    *The enamel is relatively thinner on primary teeth
    ** The pulp chambers and
    pulp horns are relatively large in
    proportion to those of the permanent teeth
98
Q

primate spaces

A

Spaces between the primary maxillary
lateral incisor and canine, and also
between the primary mandibular canine and first molar
- spaces for room for permanent teeth once erupted
- can tell if braces may be needed if there is no room

99
Q

Arch development: leeway space

A

This difference in size, mesial-distally between the
two types of teeth, is called the leeway
space

100
Q

why are primary teeth important?

A
  • Often parents do not understand the importance of the primary teeth
  • Primary teeth hold the eruption space for the permanent teeth
  • 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
  • Early dental health education and dental care are essential in keeping the primary dentition
101
Q

Primary Tooth Eruption dates

A

Each quadrant-1 central, 1 lateral, 1 canine, 2 molars = 5 x 4 quads = 20 teeth.

Eruption begins mandibular central incisor at approximately 6 months.

RULE: mn > mx

a) 1’s 6-10 months

b) 2’s 7-10 months/9-12 months

c) 4’s 12 -18 months

d) 3’s 16-22 months

e) 5’s 20-32 months/24-32 months

Sequence 1, 2, 4, 3, 5

102
Q

The development and growth of the primary teeth are essential because..

A

The development and growth of the primary teeth are essential because they influence arch growth and provide stimuli for the formation of arch space for the permanent teeth, which are larger and more numerous (Fehrenbach & Popowics, 2020). Premature loss of primary teeth, especially canines and molars may result in malocclusion or malpositioning of the permanent teeth (Fehrenbach & Popowics, 2020). The development of the arches is generally sufficient to accommodate the increased number and size of permanent teeth. If arch development is not in accord with the size of the developing teeth, “crowding” or “diastema” (space between the teeth) may occur. Finally, primary teeth are needed for speech articulation (Fehrenbach & Popowics, 2020).

103
Q

What age does first primary tooth erupt?

A

The primary teeth begin to erupt at about six months of age and should all be present by 2-2 1/2 years of age. The first deciduous teeth to erupt are the mandibular central incisors (about 6 months). The maxillary central incisors usually erupt about a month later. As a rule, the mandibular teeth erupt before the corresponding maxillary teeth

104
Q

Exfoliation

A

The process of shedding the deciduous teeth and replacement with permanent teeth is called exfoliation. Exfoliation begins 2-3 years after the deciduous root is fully formed. The root begins to resorb at its apical end and resorption continues until the entire root has disappeared and the tooth falls out

105
Q

Primary/Deciduous Characteristics differing from Permanent Counterparts

A

Anterior teeth have smaller crowns and roots
Have no mamelons
Molars are wider mesial to distal than permanent bicuspids
Narrower roots and longer in comparison with the crown length
Narrow cementoenamel junction
The cervical ridge of enamel at the cervical third of the crowns of deciduous anterior teeth are very prominent labially and lingually.
Buccocervical ridges of molars are much more pronounced creating a more bulbous or “bell-shaped” appearance
Roots are more slender and longer and flare apically to allow room in between for the developing permanent tooth crowns.
Lighter in colour more white with a bluish cast
Pulp chambers are large compared to crown size
Pulp horns extend more occlusally
Less dense pulp
Less dense enamel with inconsistent depth

106
Q

Permanent Teeth Eruption Dates

A

*6-7 Years
Maxillary 1st Molars
Mandibular Central Incisors
Mandibular 1st molars

*7-8 years
Maxillary Central Incisors
Mandibular Lateral Incisors

*8-9 years
Maxillary Lateral Incisors

*9-10 years
Mandibular Cuspids

*10-11 years
Max 1st Premolar
Mandi 1st premolar

*10-12 years
Max 2nd premolar

*11-12 years
Max Cuspids

*11-13 years
mandi 2nd molar
Max 2nd molars

*12-13 years
Mandi 2nd premolars

*17-21 years (if at all)
mandi 3rd molar
Max 3rd molars

107
Q

Role of Incisors

A

These teeth, with their sharp biting edge, are designed to cut. The tongue side is “shovel-shaped” to guide food into the mouth.

108
Q

Role of Cuspids/Canine

A

The crown of a cuspid tooth is more massive than that of an incisor: cuspids also have the longest roots of any of our teeth. They are placed in the corners of the mouth and are designed for holding, and grasping.

109
Q

Role of Premolars/Bicuspids

A

Located posterior to the cuspids, these teeth have two cusps to help hold or grasp pieces of food but they also have a broader surface used to pulverize or grind food.

110
Q

Role of Molars

A

These teeth have several cusps which provide a broad working surface and interlock with the opposing teeth to pulverize or grind food.

111
Q

Anterior Teeth Line angles

A

distolabial
mesiolabial
distolingual
mesiolingual
linguoincisal
labioincisal

112
Q

Posterior Teeth Line Angles

A

distobuccal
mesiobuccal
distolingual
mesiolingual
disto-occlusal
mesio-occlusal
bucco-occlusal
linguo-occlusal

113
Q

Anterior Teeth Point Angles

A

mesiolabioincisal
distolabioincisal
mesiolinguoincisal
distolinguoincisal

114
Q

Posterior Teeth Point Angles

A

mesiobucco-occlusal
distobucco-occlusal
mesiolinguo-occlusal
distolinguo-occlusal

115
Q

Functions of the lips include:

A

help take food and liquid into the mouth
prevent ingestion of extremely hot or cold substances
seal for the mouth (keeps food/liquids and saliva from escaping)
helps to maintain the position of the teeth
speech
expel air

116
Q

Vermillion Zone

A

Between these two areas lies a transitional zone of reddish tissue known as the vermillion zone (area) of the lip.

117
Q

Vermillion Border

A

The vermillion border is the line of demarcation between the vermillion zone and the skin of the face

118
Q

Philtrum

A

The skin of the upper lip has an indentation extending from the area below the middle of the nose to the center of the upper lip known as the philtrum. It is at the lateral junction of this philtrum that a cleft lip would be seen

119
Q

Nasiolabial sulcus

A

The nasolabial sulcus is a shallow depression extending from the corner of the nose to the corner of the mouth.

120
Q

Labio-mental groove

A

The labio-mental groove is a shallow linear depression between the center of the lower lip and chin.

121
Q

Labio-marginal sulcus

A

The labio-marginal sulcus refers to the shallow depression extending downward from the corners of the mouth.

122
Q

Commissure

A

Commissure refers to the corner of the mouth.

123
Q

Boundaries of the Oral Cavity

A

The oral cavity is the area extending from the lips posteriorly to the area of the palatine tonsils, commonly referred to as “the tonsils”

124
Q

Functions of the oral cavity

A

mastication
moisten the food with saliva, preparing it for swallowing and digestion
sense of taste
moves food around the oral cavity
air passage
speech

125
Q

Mucous Membrane

A

Mucous membrane lines the oral cavity. This soft, pink, moist tissue is called the oral mucosa and occurs in varying thicknesses. It acts as a protective covering for the oral cavity. In some areas, it is firmly attached to the underlying bone and in other areas, it is looser

126
Q

There are three types of oral mucosa:

A

Masticatory Mucosa - covers areas subject to stress
Specialized Mucosa - covers the area that has the specific function of taste
Lining Mucosa - covers all other areas of the oral cavity

127
Q

tonsillar pillars

A

The palatine tonsils lie on the sides of the throat between two folds of tissue

128
Q

fauces

A

opening from the oral cavity into the pharynx

129
Q

oral fissure

A

The opening from the oral cavity to the exterior

130
Q

The oral cavity can be divided into two parts:

A

the vestibule and the oral cavity proper. The vestibule is the space between the lips or cheeks and the teeth. The oral cavity proper is the area from the teeth back to the oro-pharynx

131
Q

mucobuccal or mucolabial fold

A

is the point at which the mucosa of the cheeks or lips turns to go towards the “gums”.

132
Q

mucogingival junction

A

The mucogingival junction is the point at which the mucosa becomes tightly attached to the alveolar bone and is the beginning of the gingiva.

133
Q

diastema

A

if the maxillary labial frenum is too firm for the erupting central incisors to penetrate, they may be pushed aside so space would exist - gap tooth

134
Q

buccal frenula

A

less well-defined frenula in the cuspid or bicuspid areas

135
Q

maxillary tuberosity

A

a small, rounded extension of bone, covered with soft tissue, is found posterior to the last maxillary tooth

136
Q

retromolar area

A

The retromolar area is a triangular area of bone, covered with soft tissue, posterior to the last mandibular tooth

137
Q

exotoses

A

Exostoses are small bony growths on the buccal cortical plate of the vestibule – in a large portion of the population. They are normally of no consequence

138
Q

bony eminence

A

The bony eminence is the raised contour of bone, covered with soft tissue, that follows the roots of the teeth, in particular, the canine eminence

139
Q

gingiva

A

Surrounding the necks of the teeth and covering the bone in which the teeth are anchored is a pink, stippled mucosa called the gingiva

140
Q

rugae

A

The rugae are transverse ridges of tissue found in the anterior portion of the hard palate. They extend laterally from the palatine raphe, which is a ridge of tissue running down the midline of the palate

141
Q

palatine raphe

A

the ridge of tissue running down the midline of the palate

142
Q

fovea palatinus

A

Two small indentations, one on either side of the raphe - are located at the junction of the hard and soft palate. These are remnants of minor salivary glands

143
Q

incisive papilla

A

There is a singular bulge of tissue at the mid-line immediately behind the maxillary central incisors known as the incisive papilla. Beneath this papilla is the incisive canal, which carries a nerve to the soft tissue lingual to the maxillary anterior teeth, a point of injection for anesthetizing the palatal gingiva adjacent to the maxillary anterior teeth

144
Q

torus palatinus

A

may be an excess bony growth in the midline of the hard palate

145
Q

functions of the hard palate

A

crush foods in preparation for swallowing
assists in swallowing
helps prevent injury to the oral structures by determining the texture and temperature of food

146
Q

Soft palate

A

The posterior third of the palate is called the soft palate. It is composed of muscular fibers covered with mucosa and is a deeper pink colour than the hard palate because of its highly vascular composition

During speaking or swallowing, the soft palate is elevated and pulled backward, closing off the nasal cavity.

147
Q

The following structures are located at the posterior portion of the oral cavity:

A

fauces – arch or entryway that joins the oral cavity with the pharynx, also called the oro-pharynx
pillars of fauces – two folds of tissue on either side, one behind, one in front of, the tonsils
palatopharyngeal arch or fold – a more prominent fold, behind the tonsil, also called the posterior pillar
palatoglossal arch or fold– immediately in front of the tonsil, also called the anterior pillar
palatine tonsils – masses of lymphoid tissue located between the anterior and posterior pillars of fauces

148
Q

ankyloglossia, or “tongue tied”

A

If the lingual frenum is attached close to the tongue and is rather short, the tongue will have limited movement. This condition is called ankyloglossia, or “tongue tied”.

149
Q

sublingual caruncle

A

At the base of the frenum, there is a small elevation on each side known as the sublingual caruncle. This is the opening for salivary glands

150
Q

sublingual fold

A

Extending from the sublingual caruncle back along the floor of the mouth on either side of the mouth is a fold of tissue called the sublingual fold, containing a number of small openings or ducts of the sublingual salivary gland

151
Q

mandibular tori

A

There may frequently be some bony projections on the lingual surface of the lower jaw at the cuspid-bicuspid area. These are similar to the palatal tori

152
Q

The Tongue

A

The tongue is an epithelial sac filled with muscles. The base is attached to the floor of the mouth, while the anterior portion is free

153
Q

Dorsum surface of tongue

A

the top of tongue

154
Q

ventral surface of tongue

A

the underside of tongue

155
Q

Functions of the tongue

A

crushes food against the hard palate
pushes food between the occlusal surfaces of the teeth
transfers food from one area of the mouth to another
mixes food with saliva
selects the parts of the masticated mass that is ready to be swallowed
assists in swallowing
after swallowing, it helps to cleanse the mouth of food residue
important in the formation of speech sounds

156
Q

Hairy Tongue

A

Sometimes the epithelium on these papillae grows very long and traps food. Pigments originating from oral bacteria and food may stain them

157
Q

Glossitis

A

Sometimes, the epithelium of tongue papillae is lost and the surface of the tongue becomes very smooth

158
Q

Foliate papillae

A

If you grasp the tip of the tongue with a piece of gauze and gently pull it out and to the side, you will see a roughened lateral surface back in the region of the vallate papillae. These are the foliate papillae. They are not well developed but do contain some taste buds

159
Q

lingual tonsils

A

is a region near the mid-line on the dorsum of the tongue, just behind the vallate papillae. This is tissue similar to that of the palatine tonsils and provides a defense mechanism in that area

160
Q

The _________ duct conveys saliva from the submandibular gland to the mouth.

A

Wharton’s

161
Q

Saliva from the parotid gland enters the mouth:

A

opposite the maxillary second molar

162
Q

The largest of the salivary glands, located below and towards the posterior of the mandible is the ___________ gland

A

Submandibular

Anatomy (32 decks)

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