Pediatric Primary Tooth Anatomy- Dr. Webb Flashcards
1
Q
Life Cycle of the tooth: Stages
A
- Initiation
- Proliferation
- Histodifferentiation
- Morphodifferentiation
- Apposition
- Calcification
- Eruption
2
Q
Initiation stage
A
- Aka Bud Stage
- 6th week of embryo
- epithelial thickening that becomes dental lamina
- Permanent Molars and primary teeth arise from dental lamina
- Permanent Incisors, canines, and premolars develop from their primary predecessors
3
Q
Congenital Absence of a tooth
A
- Lack of initiation or arrest in the proliferation of cells
4
Q
Supernumerary teeth
A
Continued budding of teeth
5
Q
Proliferation
A
- Aka Cap Stage
- unequal growth of different parts of the bud
- Peripheral cells of the cap form the outer and inner enamel epithelium
6
Q
Dificiency in proliferation results in
A
Fewer than normal number of teeth
7
Q
Excessive proliferation results in
A
cysts, odontomas or supernumery tooth
8
Q
Histodifferentiation
A
- Aka Bell stage (& morphodifferentiation)
- dental papilla cells differentiate into odontoblasts
- inner enamel epithelium differentiate into ameloblasts
9
Q
Disturbances in histodifferentation results in
A
- Abnormal structure of dentin or enamel
- amelogenesis imperfecta=most common
10
Q
Morphodifferentation stage
A
- Aka Bell stage (&histodifferentiation)
- Formative cells arranged to form the tooth
- Boundary between inner enamel epithelium and odontoblast become DEJ
11
Q
disturbances in morphdifferentation stage results in
A
- Abnormal forms and sizes of teeth
- peg teeth (Peg Laterals)
- Microdontia
- Macrodontia
12
Q
Apposition Stage
A
- Ameloblasts and odontoblasts secrete tissue matrix
- Begin their work at sites called growth centers
13
Q
Apposition stage disturbances result in
A
- Systemic disturbance or local trauma that injures the ameloblasts during enamel formation or arrest in matrix apposition results in ENAMEL hyperplasia
14
Q
Calcification Stage
A
- Precipitation of calcium in the matrix
- Further precipitation of original nidus with concentric laminations
- fusion of individual calcopherites
- 11th week in utero=first indication
- 14th week=Primary Central Incisors
- 15.5 week=Primary 1st Molars
- 16th week= Primary Lateral Incisors
- 17th week=Primary Canines
- 18th week= Primary 2nd molar
- 28th week=Permanent 1st molar
15
Q
Calcification stage disturbance
A
- Lack of fusino of calcospherites in dentin=Interglobular dentin
22
Q
Primary Maxillary Cental Incisor
A
- Crown
- Wide> taller
- No developemental lines
- smooth labial surface
- straight incisal edge
- Lingual Surface
- distinct cingulum
- well developed marginal ridge
- Root:
- Cone shaped
- tapered sides
23
Q
Primary Maxillary Lateral Incisor
A
- Crown Outline similar to cental incisor,
- crown is smaller in all dimensions
- Length>width
- crown is smaller in all dimensions
- Root outline similar to central incisor
- but longer when compared to crown
24
Q
Primary Maxillary Canine
A
- Crown:
- more constricted at cervical region than incisors
- incisal and distal surfaces=more convex
- Sharp Cusp, well developed
- straight incisal edge-incisors
- Root:
- Long, slender, tapering root
- more than 2x length of crown
- curves distally-apical to middle 1/3
25
Q
Incisal View of Maxillary Primary Anteriors
A
- Incisal edge:
- straight
- centered over crown
- Labial Surface
- is broader and smoother than lingual surve
- Lingual surface
- tapers toward cingulum
