Dh-Ohe: Deha Ch 6-Tooth Development And Eruption

Front 1

Discuss and explain the two dentitions and when they occur.

Back 1

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

Hint 1

Objective 1
DEHA Ch 6, p 62

Front 2

Name and explain the three dentition periods.

Back 2

THREE DENTITION PERIODS

(1) Primary Dentition
(2) Mixed Dentition-overlapping period; primary & perm. teeth
(3) Permanent Dentition

Hint 2

Objective 2
DEHA Ch 6, p 62

Front 3

What is odontogenesis

Back 3

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

Hint 3

Objective 3
DEHA Ch 6, p 62

Front 4

How does the process of odontogenesis occur?

Back 4

PROCESS OF TOOTH DEVELOPMENT

(1) Induction
(2) proliferation
(3) differentiation
(4) morphogenesis
(5) maturation

Hint 4

Objective 3.2
DEHA Ch 6, p 62, Table 6.1

Front 5

In what order to teeth begin to develop?

Back 5

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

Hint 5

Objective 3.3
DEHA Ch 6, p 62

Front 6

Name the stages of tooth development and when do they occur?

Back 6

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

Hint 6

Objective 3.4
DEHA Ch 6, p 63 Table 6.1

Front 7

What occurs during the initiation stage, and what tissues are involved?

Back 7

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

Hint 7

Objective 4
DEHA Ch 6, p 64, Table 6.1, Fig 6.1

Front 8

Where does dental lamina originate from and where does it form?

Back 8

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

Hint 8

Objective 4.1
DEHA Ch 6, p 64, Fig 6.2

Front 9

What developmental disturbances can occur during the initiation stage? Describe them

Back 9

INITIATION STAGE (DISTURBANCES)
"abnormal initiation"

(1) Anodontia-absence of single or multiple teeth

(2) Supernumerary Teeth-dev. Of one or more teeth

Hint 9

Objective 5
DEHA Ch 6, p 65, Table 6.3

Front 10

What are the etiological factors and clinical ramifications of Anodontia?

Back 10

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

Hint 10

Objective 5.1

DEHA Ch 6, pg 69, Table 6.3

Front 11

What are the etiological factors and clinical ramifications of Supernumerary teeth?

Back 11

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)

Hint 11

Objective 5.2
DEHA Ch 6, pg 69, Table 6.3

Front 12

What occurs during the bud stage, and what tissues are involved?

Back 12

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)

Hint 12

Objective 6
DEHA Ch 6, pg 70, Fig 6.3; Fig 6.4

Front 13

What developmental disturbances can occur during the bud stage? Describe them

Back 13

BUD STAGE (DISTURBANCES)

(1) Macrodontia-abnormally LARGE teeth
(2) Microdontia-abnormally SMALL teeth

Hint 13

Objective 7
DEHA Ch 6, p 66, Table 6.3

Front 14

What are the etiological factors and clinical ramifications of Microdontia and Macrodontia?

Back 14

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")

Hint 14

Objective 7.1
DEHA Ch 6, pg 71, Table 6.3

Front 15

What occurs during the cap stage, and what tissues are involved?

Back 15

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

Hint 15

Objective 8
DEHA Ch 6, pg 71-73

Front 16

Describe the enamel organ? What does it give rise to?

Back 16

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

Hint 16

Objective 8.2
DEHA Ch 6, pg 72; Table 6.4

Front 17

Describe the Dental Papilla? What does it give rise to?

Back 17

DENTAL PAPILLA

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

FUTURE DENTAL TISSUE:

(3) Dentin and Pulp

Hint 17

Objective 8.3
DEHA Ch 6, pg 72; Table 6.4

Front 18

Describe the Dental Sac? What does it give rise to?

Back 18

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

Hint 18

Objective 8.4
DEHA Ch 6, pg 73; Table 6.4

Front 19

What is morphogenesis?

Back 19

MORPHOGENESIS

Morph= to change
Genesis= creation/beginning

(1) the beginning of change
(2) the predominant physiological process of the CAP STAGE

Hint 19

Objective 8.5
DEHA Ch 6, pg 72

Front 20

What does the tooth germ consist of?

Back 20

TOOTH GERM (aka Primordium of the Tooth)
(Remember "E-D-D")

(1) Enamel Organ
(2) Dental Papilla
(3) Dental Sac

Hint 20

Objective 9
DEHA Ch 6, pg 73; Fig 6.5

Front 21

What is the successional dental lamina, and what does it provide?

Back 21

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

Hint 21

Objective 10

DEHA Ch 6, pg 73; Fig 6.26

Front 22

What is the difference between succedaneous and nonsuccedanous teeth?

Back 22

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

Hint 22

Objective 11
DEHA Ch 6, pg 73; Fig 6.26

Front 23

What developmental disturbances can occur during the cap stage?

Back 23

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

Hint 23

Objective 12
DEHA Ch 6, p 66-68, Table 6.3

Front 24

What occurs during the bell stage, and what tissues are involved?

Back 24

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

Hint 24

Objective 13

Front 25

What developmental disturbances can occur during the bell stage?

Back 25

???????
Text only listed those during Apposition/Maturation stage

Hint 25

Objective 14

Front 26

What does the enamel organ consist of, and what is the function of each layer?

Back 26

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

Hint 26

Objective 15
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 27

Describe the OEE of the enamel organ and state its function

Back 27

(OEE) OUTER ENAMEL EPITHELIUM

DESCRIPTION:
(1) outer CUBOIDAL CELLS of enamel organ

FUNCTION:
(1) PROTECTIVE BARRIER for enamel organ

Hint 27

Objective 15.1
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 28

Describe the Stellate Reticulum of the enamel organ and state its function

Back 28

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

Hint 28

Objective 15.2
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 29

Describe the Stratum Intermedium of the enamel organ and state its function

Back 29

STRATUM INTERMEDIUM

Stratum = compressed ??
Intermedium =???

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

FUNCTION:
(1) SUPPORTS the production of enamel matrix

Hint 29

Objective 15.3
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 30

Describe the IEE of the enamel organ and state its function

Back 30

(IEE) INNER ENAMEL EPITHELIUM

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

FUNCTION:
(1) differentiates into AMELOBLASTS that form enamel matrix

Hint 30

Objective 15.4
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 31

Describe the layers of the dental papilla.

Back 31

DENTAL PAPILLA

(1) OUTER LAYER of Dental Papilla
(2) CENTER CELLS of Dental Papilla

Hint 31

Objective 16
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 32

Describe the Outer Layer of the Dental Papilla and state its function

Back 32

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

Hint 32

Objective 16.1
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 33

Describe the Center Cells of the Dental Papilla and state its function

Back 33

CENTER CELLS OF DENTAL PAPILLA (aka INNER CELLS)

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

FUNCTION:
(1) differentiates into PULP TISSUE

Hint 33

Objective 16.2
DEHA Ch 6, p75; Fig 6.7; Table 6.5

Front 34

Describe the dental sac and its function.

Back 34

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

Hint 34

Objective 17

Table 6.5

Front 35

Explain the stages of apposition and maturation during tooth development.

Back 35

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

Hint 35

Objective 18

Front 36

Describe the process of induction during tooth development.

Back 36

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

Hint 36

Objective 19
DEHA Ch 6, Table 6.1