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Tooth Morphology Terminology
Tooth Morphology Terminology
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08/09/2011

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Term
morphology
Definition
a) branch of biology that deals with the forms and structures of animals and plants b) the form and structure of an organism or any of its parts
Term
anatomy
Definition
branch of morphology that deals with the structure of organisms
Term
terminology
Definition
1) the technical or special terms used in a business, art, science or special subject 2) nomenclature as a field of study
Term
nomenclature
Definition
1) NAME, DESIGNATION 2) the act or process or an instance of naming 3) a) a system of set of terms or symbols, esp in a particular science, discipline or art b) an international system of standardized New Latin names used in biology for kinds and groups of kinds of animals and plants
Term
2 sets
Definition
number of sets of teeth humans have during lifetime
Term
diphyodont
Definition
animal with 2 successive sets of teeth
Term
polyphyodont
Definition
animal with many successive sets of teeth
Term
primary/decidous teeth begin to form when?
Definition
prenatally about 14 weeks in utero
Term
number of teeth in primary dentition
Definition
20; 10 in maxilla, 10 in mandible
Term
in deciduous teeth, how many in each quadrant?
Definition
5: 2 incisors, one canine, 2 molars
Term
when do the first primary teeth emerge in the oral cavity?
Definition
mean 8 months, avg--6-12 months
Term
what are the first primary teeth that emerge?
Definition
mandibular central incisors
Term
at what age do the last primary teeth emerge in the oral cavity?
Definition
28+/- 4 months
Term
what are the last primary teeth to emerge in the oral cavity?
Definition
maxillary 2nd molars
Term
at what age do the first permanent teeth begin erupting in oral cavity?
Definition
6 years
Term
what are the first permanent teeth that emerge in the oral cavity?
Definition
mandibular first molars, distal to primary teeth, "6 year molars" *some children have mandibular incisors that emerge first*
Term
eruption of permanent teeth begins what?
Definition
mixed dentition/transition period
Term
how long does the mixed dentition period last?
Definition
6-12 years
Term
when does the permanent dentition period begin?
Definition
when permanent 2nd molars start to erupt and primary molars are replaced by permanent premolars
Term
mean age for permanent dentition period?
Definition
12 years old
Term
when is the eruption of permanent teeth completed?
Definition
14-15 years old, except for 3rd molars
Term
at what age are the third molars usually completed?
Definition
18-25 years old
Term
maxillary/maxilla
Definition
refer to upper jaw
Term
mandibular/mandible
Definition
refers to lower jaw
Term
primary teeth also known as?
Definition
deciduous teeth, baby teeth, milk teeth
Term
permanent teeth also known as?
Definition
secondary teeth, succedaneous teeth
Term
what is the formula for primary teeth?
Definition
I 2/2 C 1/1 M 2/2 =10
Term
dental formula for permanent teeth?
Definition
I 2/2 C 1/1 P 2/2 M 3/3 = 18 (on one side)
Term
Zsigmondy/Palmer system of tooth numbering for permanent teeth
Definition
87654321 12345678
87654321 12345678
Term
Zsignomndy/Palmer notation for primary teeth
Definition
EDCBA ABCDE
EDCBA ABCDE
Term
2 digit system proposed by FDI for permanent teeth
Definition
18 17 16 15 14 13 12 11 21 22 23 24 25 26 27 28
48 47 46 45 44 43 42 41 31 32 33 34 35 36 37 38
Term
2 digit system proposed by FDI for primary teeth
Definition
55 54 53 52 51 61 62 63 64 65
85 84 83 82 81 71 72 73 74 75
Term
universal system of numbering for permanent dentition
Definition
Term
universal system for numbering primary dentition
Definition
A--J
T--K
Term
clinical crown
Definition
part of tooth that can be seen in oral cavity
Term
clinical root
Definition
part of tooth covered by gingiva
Term
anatomical crown
Definition
part of crown that is covered with enamel
Term
anatomical root
Definition
part that is covered with the cementum
Term
cervical line/cementoenamel junction (CEJ)
Definition
divides the anatomical root and anatomical crown
Term
apex/apices
Definition
tip of root
Term
apical foramen
Definition
opening at root apex
Term
hard tissues of tooth
Definition
enamel, dentin, cementum
Term
soft tissue of tooth
Definition
pulp
Term
what anchors tooth to bone?
Definition
periodontal ligament
Term
pulp horn
Definition
projections in roof of pulp chamber correspond to major cusps or lobes
Term
pulp chamber
Definition
the crown portion of a tooth that contains the pulp tissues
Term
root canal
Definition
root portion of tooth that contains pulp tissue
Term
furcation
Definition
area of multi-rooted tooth that root divides
Term
root trunk
Definition
area of the root between CEJ and furcation
Term
alveolar process
Definition
portion of jaw serving as support for tooth
Term
alveolus/alveoli
Definition
bone of tooth socket
Term
proximal
Definition
towards the adjacent teeth
Term
mesial
Definition
towards the midline
Term
distal
Definition
away from the midline
Term
facial
Definition
towards the face
Term
labial
Definition
towards the lip
Term
buccal
Definition
towards the cheek
Term
lingual
Definition
towards the tongue
Term
occlusal
Definition
the chewing surface/the surface that comes in contact with opposing teeth
Term
incisal
Definition
cutting surface
Term
radicular
Definition
of, relating to, or occurring at the root of a tooth
Term
coronal
Definition
of, relating to, or occurring at the crown on a tooth
Term
lobe
Definition
one of the primary sections of formation in development of the crown
Term
structures representative of lobes?
Definition
cusps, cingulum, mamelons
Term
tubercle
Definition
an elevation of the crown produced by an extra formation of enamel, usually used when deviation from typical form
Term
line angles
Definition
junction of two surfaces
Term
point angles
Definition
junction of 3 surfaces
Term
how many line angles are in anterior teeth? names?
Definition
6--labioincisal, mesiolingual, mesiolabial, linguoincisal, distolingual, distolabial
Term
how many line angles are there in posterior teeth? names?
Definition
8--mesio-occlusal, mesiolingual, mesiobuccal, bucco-occlusal, linguo-occlusal, distolingual, distobuccal, distoocclusal
Term
how many point angles are there in all teeth? names?
Definition
4: anterior teeth: mesiolabioincisal, mesiolingualincisal, distolabioincisal, distolingualincisal
posterior teeth: mesiolinguo-occlusal, mesiobucco-occlusal, distolinguo-occlusal, distobucco-occlusal
Term
embrasures
Definition
"empty" triangular spaces surrounding proximal contact
Term
interdental papilla (IDP)
Definition
cervical or gingical embrasures contain this part of gingiva
Term
2 purposes for embrasures
Definition
1) provide a spillway for food
2) prevent food from being forced into contact areas
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