Dental Anatomy

tooth development that takes place in many stages

What structure in the body has the longest developmental period?

What tooth development stage occurs in the 6th - 7th week?

What tooth development stage occurs in the 8th week?

What tooth developmental stage occurs in the 9th - 10th week?

What tooth developmental stage occurs in the 11th-12th weeks?

What physiological processes occur during the apposition stage?

What physiological process occurs during the maturation stage?

What physiological process occurs during the initiaion stage?

What physiological process occurs during the bud stage?

What physiologic process occurs during the cap stage?

What physiological process occurs during the bell stage?

interactin between embryological tissues, mesenchymal tissues must influence the ectodermal tissue for initiation of odontogenesis, but the mechanisms are unkown. The cells decide what they will become

tissues that must influence the ectodermal tissues for initiation of odontogenesis.

lines the stomodeum, or primitive mouth at the beginning of the sixth week of the embryo

the outer portion of the ectoderm gives rise to _________ _________. horse shoe shaped arches one for each future jaw

dppe to the oral epithelium, a type of mesenchyme originally from the ectoderm is the_________, whichi is influenced by neural crest cells

structure that separates the oral epithelium and the ectomesenchyme in the stomodeum

structure that forms during the later portion of the seventh week when the oral epithelium grows deeper into the ectomesenchyme and is induced to produce this new layer

the dental lamina begins initially to form in the ______for both arches, and progresses ________

10 structures that form during the bud stage of tooth development, and form from extensive proliferation of the dental lamina penetrating into the ectomesenchyme

true or false. a basement membrane still exists between the tooth bud and the growing ectomesenchyme in the bud stage
True False

each of the buds together with the surrounding ectomesenchyme will develop into a what?

When does primary dentition develop?

When does the permanent dentition develop?

3 developmental disturbances in the initiation stage

lack of initiation; most commonly occurs with the permanent maxillary lateral incisors, third molars, mandibular 2nd premolars

What teeth are most likely to be congenitally missing?

syndrome associated with anodontia; may also be caused by endocrine dysplasia, systemic diseases, excessive radiation exposure

abnormal initiation leading to the development of extra teeth

Where are places that supernumerary teeth often occur?

developmental disturbances that occur during the bud stage

abnormal proliferation leading to a single tooth or entire dentition to be larger than normal; hereditary

single tooth or entire dentition develops smaller than normal; hereditary

microdontia in maxillary lateral incisors

microdontia in permanent 3rd molars

complete macro and microdontia is rare and can occure due to dysfunction of the ___________ gland

unequal growth in different parts of the tooth bud leading to formation of a cap shape attached to the dental lamina occurs in what stage?

which physiological process is dominent in the cap stage/

primordium of tooth develops with a specific form; consists of enamel organ, dental papilla, dental sac, and will develop into primary dentition

the tooth germ consists of what 3 layers?

originally develops from the ectoderm; depression in the deepest part of the dental lamina forming a cap eventually forming enamel for outer surface of the tooth

mass within the concavity of the cap of the enamel organ; will become the dentin and pulp

exists between the enamel organ and the dental papilla, and will become the dentinoenamel junction

condensed mass of ectomesenchyme surrounding the enamel organ; produces peridontium

primoridium of the permanent dentition that is an extension of the dental lamina into the ectomesenchyme

the successional dental lamina always extend into the ectomesenchyme________to the forming primary tooth germs

Where do nonsuccedaneous teeth develop from?

4 developmental disturbances in the cap stage

enamel organ abnormally invaginates into the dental papilla; usually leaves the tooth with a deep lingual pit, which can lead to pulpal exposure and pathology and possible endo therapy

radiographically appears as a tooth within a tooth

dens in dente commonly affects what teeth?

single tooth germ unsuccessfully attempts to divide into 2, results in a single rooted tooth with a common pulp cavity

exhibits 'twining' in crown area

where does gemination usually affect?

results from the union of 2 adjacent tooth germs, possibly due to pressure in the area; 2 distinct pulp cavities, but enamel, dentin, and pulp are united

where does fusion usually occur?

extra cusps or extensions of enamel; may be due to trauma, pressure, metabolic disease

where are tubercles commonly found?

What physiological process occurs at its furthest extent during the bell stage?

What are the 6 different types of cells found in the bell stage?

increasing amounts of collagen fibers forming around enamel organ

the dental sac will differentiate into what?

outer cuboidal cells of enamel organ that serve as a protective barrier for enamel organ

more outer star-shaped cells in many layers, forming a network within the enamel; supports the production of the enamel matrix

more inner layer of flat to cuboidal cells; supports the production of enamel matrix

innermost tall columnar cells of enamel organ

the inner enamel epithelium differentiates into the ___________ that form _______- _________

outher layer of cells of the dental papilla nearest the IEE; there is a basement membrane between these layers

outer cells of the denatl papilla will give rise to _________ that form the ______ ______

will differentiate into pulp tissues

final stage of odontogenesis during which enamel, dentin, and cementum are secreted in successive layers

enamel, dentin, and cementum are initially secreted as a __________ that is partially calcified and yet serves as a framework for later calcification

other final stage which is reached when the dental tissues are fully mineralized

developmental disturbances in apposition and maturation phases

faulty development of the enamel resulting from interference of metabolic processes of the ameloblasts, may involve individual areas, (localized) or large numbers of ameloblasts (systemic)

results from decreased quantity of enamel matrix, teeth appear pitted and grooved

Name 2 type of teeth that result from enamel hypoplasia

incosor crown has a screwdriver shape with notched incisal edge, result of enamel hypoplasia

have enamel tubercles on the occlusal surface, result of enamel hypoplasia

distrubance results in the reduction of quality of enamel maturation - teeth appear more opaque, yellower, or browner due to intrinsic staining of enamel

What are 2 developmental disturbances that may occur together, especially as a result of fluorosis?

enamel dysplasia which is hereditary and can affect all teeth of both dentitions

dentinal dysplasia which may be hereditary

during the _____ _____ IEE cells grow even more _________ or elongate as they differentiate into __ _________

the nuclei of all the cells move away from the center and position themselves farthes away from the basement membrane in the bell stage

What stage does repolarization occur?

Preameloblasts will differentiate into the cells secreting the enamel matrix, preameloblasts will also induce ______ _____ ______ to ____________

The outer cells of the dental papilla are induced by the ________ to differentiate into ______________

The odontoblasts are lined up next to the basement membrane in a _____-- ____________ of the preameloblasts

Odontoblasts produce what?

Does dentin or enamel formation begin first?

Why is the dentin layer slightly thicker than the enamel layer?

When does the basement membrane between the ameloblasts and odontoblasts disintegrate?

What induces preameloblasts to differentiate into ameloblasts?

tapered portion of each ameloblast facing the disintegrating basement layer; secretes enamel matrix

forms as a result of the mineralization of the disintegrating basement membrane and joining of the dentin and enamel matrixes

attached cellular extensions in the length of the predentin left by the odontoblasts

Where are the odontoblastic processes contained?

Cell bodies of odontoblasts ________ _________ the _________ tissue

Do we keep our ameloblasts?

When does root development occur?