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36 Cards in this Set

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Discuss and explain the two dentitions and when they occur.
PRIMARY DENTITION (aka Deciduous dentition)
(1) consists of 20 teeth
(2) Dev. Embryonic & Fetal Periods 6th, 7th wk

PERMANENT DENTITION (aka Second dentition)
(1) consists of 32 teeth
(2) Dev. During Fetal period
Objective 1
DEHA Ch 6, p 62
Name and explain the three dentition periods.
THREE DENTITION PERIODS

(1) Primary Dentition
(2) Mixed Dentition-overlapping period; primary & perm. teeth
(3) Permanent Dentition
Objective 2
DEHA Ch 6, p 62
What is odontogenesis
ODONTOGENESIS

Odonto=teeth
Genesis=formation

Complex process by which TEETH form
(1) from EMBRYONIC CELLS
(2) grow
(3) erupt into the mouth


Occurs in overlapping stages
Objective 3
DEHA Ch 6, p 62
How does the process of odontogenesis occur?
PROCESS OF TOOTH DEVELOPMENT

(1) Induction
(2) proliferation
(3) differentiation
(4) morphogenesis
(5) maturation
Objective 3.2
DEHA Ch 6, p 62, Table 6.1
In what order to teeth begin to develop?
DEVELOPMENT OF TEETH

(1) Anterior Mandibular Teeth
(2) Anterior Maxillary Teeth
(3) Posterior teeth on both arches

*not all teeth in each dentition develop at the same time
Objective 3.3
DEHA Ch 6, p 62
Name the stages of tooth development and when do they occur?
STAGES OF TOOTH DEVELOPMENT

(1) Initiation stage - 6th, 7th week
(2) Bud stage - 8th week
(3) Cap stage- 9th, 10th week
(4) Bell stage- 11th, 12th week
(5) Apposition stage -varies per tooth
(6) Maturation stage-varies per tooth
Objective 3.4
DEHA Ch 6, p 63 Table 6.1
What occurs during the initiation stage, and what tissues are involved?
INITIATION STAGE

(1) 6th-7th wk of prenatal development
(2) ORAL EPITHELIUM dev. From ECTODERM lining in stomodeum
(3) BASEMENT MEMBRANE-SEPARATES the oral epithelium from ECTOMESENCHYME
Objective 4
DEHA Ch 6, p 64, Table 6.1, Fig 6.1
Where does dental lamina originate from and where does it form?
DENTAL LAMINA

ORIGIN-Oral epithelium GROWING deeper into the underlying ECTOMESENCHYME, then it is INDUCED to produce dental lamina

FORMATION-begins in the MIDLINE of BOTH ARCHES, progresses posteriorly
Objective 4.1
DEHA Ch 6, p 64, Fig 6.2
What developmental disturbances can occur during the initiation stage? Describe them
INITIATION STAGE (DISTURBANCES)
"abnormal initiation"

(1) Anodontia-absence of single or multiple teeth

(2) Supernumerary Teeth-dev. Of one or more teeth
Objective 5
DEHA Ch 6, p 65, Table 6.3
What are the etiological factors and clinical ramifications of Anodontia?
ANODONTIA-Lack of Initiation (ectodermal dysplasia)

ETIOLOGICAL FACTORS:
(1) hereditary
(2) endocrine dysfunction
(3) systemic disease
(4) excess radiation

CLINICAL RAMIFICATIONS: (disrupts occlusion/aesthetics)
(1) perm. Max. lateral incisors
(2) 3rd molars

(3) Mand 2nd premolars
Objective 5.1

DEHA Ch 6, pg 69, Table 6.3
What are the etiological factors and clinical ramifications of Supernumerary teeth?
SUPERNUMERARY-Abnormal Initiation

ETIOLOGICAL FACTORS:
(1) hereditary

CLINICAL RAMIFICATIONS: (disruption of occlusion/crowding)
(1) b/w Max. central incisors (Mesiodens)
(2) Distal of 3td molars (Distomolar)
(3) Premolar regions (Perimolar)
Objective 5.2
DEHA Ch 6, pg 69, Table 6.3
What occurs during the bud stage, and what tissues are involved?
BUD STAGE

(1) Beginning of 8th wk of prenatal development
(2) named for EXTENSIVE PROLIFERATION (Growth)
(3) Growth of DENTAL LAMINA into the ECTOMESENCHYME
(4) Underlying ECTOMESENCHYME also proliferates

TOOTH GERM
(1) DEV. From buds in the DENTAL LAMINA and surrounding ECTOMESENCHYME

TISSUES: where all teeth develop from
(1) ECTODERM
(2) MESENCHYMAL TISSUES (ectomesenchyme)
Objective 6
DEHA Ch 6, pg 70, Fig 6.3; Fig 6.4
What developmental disturbances can occur during the bud stage? Describe them
BUD STAGE (DISTURBANCES)

(1) Macrodontia-abnormally LARGE teeth
(2) Microdontia-abnormally SMALL teeth
Objective 7
DEHA Ch 6, p 66, Table 6.3
What are the etiological factors and clinical ramifications of Microdontia and Macrodontia?
MACRODONTIA -ABNORMAL PROLIFERATION (bud stage)

ETIOLOGICAL FACTORS:
(1)Partial Macrodontia - hereditary
(2) Complete Macrodontia - Endocrine dysfunction

CLINICAL RAMIFICATIONS:
(1) perm. Max. lateral incisor (aka "peg lateral")
(2) perm third molars (aka "peg molars")
Objective 7.1
DEHA Ch 6, pg 71, Table 6.3
What occurs during the cap stage, and what tissues are involved?
CAP STAGE

(1) 9th-10th wk of prenatal development
(2) con't of PROLIFERATION + DIFFERENTIATION
(3) formation of ENAMEL ORGAN (CAP SHAPE)
(4) Tooth Germ develops w/specific form
(5) DENTAL PAPILLA forms from ECTOMESENCHYME into the cavity of CAP
Objective 8
DEHA Ch 6, pg 71-73
Describe the enamel organ? What does it give rise to?
ENAMEL ORGAN

(1) formation of tooth bud in a CAP SHAPE
(2) with DEEP CENTRAL DEPRESSION
(3) signals future CROWN to be made

FUTURE DENAL TISSUE:
(3) will produce ENAMEL (outer surface)
(4) ectodermal product
Objective 8.2
DEHA Ch 6, pg 72; Table 6.4
Describe the Dental Papilla? What does it give rise to?
DENTAL PAPILLA

(1) Condensed mass of ECTOMESENCHYME
(2) within the CONCAVITY of the enamel organ

FUTURE DENTAL TISSUE:

(3) Dentin and Pulp
Objective 8.3
DEHA Ch 6, pg 72; Table 6.4
Describe the Dental Sac? What does it give rise to?
DENTAL SAC (aka Dental Follicle)

(1) condensed mass of ECTOMESENCHYME
(2) SURROUNDING the enamel organ

FUTURE DENTAL TISSUE: (PERIODONTIUM)
(3) cementum
(4) periodontal ligament (PDL)
(5) Alveolar bone
Objective 8.4
DEHA Ch 6, pg 73; Table 6.4
What is morphogenesis?
MORPHOGENESIS

Morph= to change
Genesis= creation/beginning

(1) the beginning of change
(2) the predominant physiological process of the CAP STAGE
Objective 8.5
DEHA Ch 6, pg 72
What does the tooth germ consist of?
TOOTH GERM (aka Primordium of the Tooth)
(Remember "E-D-D")

(1) Enamel Organ
(2) Dental Papilla
(3) Dental Sac
Objective 9
DEHA Ch 6, pg 73; Fig 6.5
What is the successional dental lamina, and what does it provide?
SUCCESSIONAL DENTAL LAMINA

(1) appears like the EXTENSION of dental lamina
(2) into the ECTOMESENCHYME-lingual to the developing PRIMARY TOOTH GERMS

PROVIDES:
(3) the site where all PERMANENT TEETH (except molars) come from
Objective 10

DEHA Ch 6, pg 73; Fig 6.26
What is the difference between succedaneous and nonsuccedanous teeth?
SUCCEDANEOUS TEETH

(1) PERM. TEETH that are PRECEDED by PRIMARY TOOTH
Ex: Perm. Anterior teeth & premolars

NONSUCCEDANEOUS TEETH

(1) PERM. TEETH that are NOT formed w/primary predecessors
Ex: 1st, 2nd, 3rd perm. Molars

(2) Dev. From post. Extension of dental lamina
Objective 11
DEHA Ch 6, pg 73; Fig 6.26
What developmental disturbances can occur during the cap stage?
CAP STAGE (DISTURBANCES)

(1) Dens in Dente-enamel organ INVAGINATES into the dental papilla
(2) Gemination-tooth germ tries to DIVIDE
(3) Fusion -UNION of two adjacent tooth germs (one less tooth)
(4) Tubercle-EXTRA CUSP due to effects on ENAMEL ORGAN
Objective 12
DEHA Ch 6, p 66-68, Table 6.3
What occurs during the bell stage, and what tissues are involved?
BELL STAGE

(1) Between 11th-12th wk of prenatal dev.
(2) con't PROLIFERATION, DIFFERENTIATION, MORPHOGENESIS
(2) ENAMEL ORGAN differentiates into 4 layers
(3) DENTAL PULP differentiates into 2 layers
Objective 13
What developmental disturbances can occur during the bell stage?
???????
Text only listed those during Apposition/Maturation stage
Objective 14
What does the enamel organ consist of, and what is the function of each layer?
ENAMEL ORGAN

Component/Function
(1) (OEE) Outer Enamel Epithelium-Protective barrier
(2) Stellate reticulum-Supports Production of Enamel
(3) Stratum intermedium - Supports Production of Enamel
(4) (IEE) Inner Enamel Epithelium-Diff into AMELOBLASTS that form enamel
Objective 15
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the OEE of the enamel organ and state its function
(OEE) OUTER ENAMEL EPITHELIUM

DESCRIPTION:
(1) outer CUBOIDAL CELLS of enamel organ

FUNCTION:
(1) PROTECTIVE BARRIER for enamel organ
Objective 15.1
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the Stellate Reticulum of the enamel organ and state its function
STELLATE RETICULUM

Stellate = star-shaped
Reticulum = network

DESCRIPTION:
(1) more OUTER star-shaped cells in MANY LAYERS
(2) forms a NETWORK within enamel organ

FUNCTION:
(1) SUPPORTS the production of enamel matrix
Objective 15.2
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the Stratum Intermedium of the enamel organ and state its function
STRATUM INTERMEDIUM

Stratum = compressed ??
Intermedium =???

DESCRIPTION:
(1) more INNER COMPRESSED LAYER
(2) flat CUBOIDAL CELLS

FUNCTION:
(1) SUPPORTS the production of enamel matrix
Objective 15.3
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the IEE of the enamel organ and state its function
(IEE) INNER ENAMEL EPITHELIUM

DESCRIPTION:
(1) INNERMOST
(2) tall, COLUMNAR CELLS of enamel organ

FUNCTION:
(1) differentiates into AMELOBLASTS that form enamel matrix
Objective 15.4
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the layers of the dental papilla.
DENTAL PAPILLA

(1) OUTER LAYER of Dental Papilla
(2) CENTER CELLS of Dental Papilla
Objective 16
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the Outer Layer of the Dental Papilla and state its function
OUTER LAYER OF DENTAL PAPILLA

DESCRIPTION:
(1) nearest the IEE
(2) basement membrane b/w this and IEE

FUNCTION:

(1) differentiates into ODONTOBLASTS that form dentin
Objective 16.1
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the Center Cells of the Dental Papilla and state its function
CENTER CELLS OF DENTAL PAPILLA (aka INNER CELLS)

DESCRIPTION:
(1) INNER cell mass of the dental papilla

FUNCTION:
(1) differentiates into PULP TISSUE
Objective 16.2
DEHA Ch 6, p75; Fig 6.7; Table 6.5
Describe the dental sac and its function.
DENTAL SAC (aka Dental follicle)

DESCRIPTION:
(1) INCREASING amount of COLLAGEN FIBERS forming around the enamel organ

FUNCTION:
(1) differentiates into peridontium and supporting tissues
-cementum , PDL, alveolar bone
Objective 17

Table 6.5
Explain the stages of apposition and maturation during tooth development.
APPOSITION STAGE

(1) enamel, dentin, cementum are secreted in SUCCESSIVE LAYERS
(2) initially secreted in PARTIALLY CALCIFIED extracellular substance

MATURATION STAGE

(1) COMPLETE MINERALIZATION of enamel, dentin and cementum
Objective 18
Describe the process of induction during tooth development.
INDUCTION

(1) Oral epithelium & dental lamina DEVELOPS from ECTODERM lining the stomodeum

(2) Oral epithelium is SEPARATED from the underlying ECTOMESENCHYME by a basement membrane
Objective 19
DEHA Ch 6, Table 6.1