NDBE Dental Anatomy Flashcards

Terms Definitions
Primary Dentition
Primary Dentition
T or F:In Primary Molars the Pulp Horns are HIGHER and the Pulp chamber is SMALLER than in Permanent Molars
FALSE:Primary Molars have HIGHER Pulp Horns but LARGER Pulp Chambers than Permenant Teeth
T or F:Primary Teeth are Darker than Perm. Teeth.
FalsePrimary Teeth are LIGHTER than Perm. Teeth
Finish Sentence:Enamel is THIN and has a ___ depth is Primary Teeth.
The crowns are wider (give direction)_____in comparision to the _____ length.
Crowns of Primary Teeth are wider MESIODISTALLY than occlusal-gingivallyThus crowns appear to have a "Squatted Appearence"
What is a Cervical Ridge?Which tooth has a more prominent cervical ridge- permenant or primary?
Facial Surface ridge that runs MESIODISTALLY in the Cervical 1/3 of the toothPrimary Teeth have a more prominent cervical ridge
The Primary tooth has a ___ neck.
Primary Molars have cervical ridge located ____.
What makes the occlusal table of a primary tooth narrower
The buccal and lingual surfaces being flatter abve the cervical curvature. thus making the occlusal table narrower.
Roots of th primary anterior teeth are narrower and longer in comparision w/ ____ than those of perm teeth.
Crown Size
Roots of these teeth are narrower, longer, and flared. Flaring is extended outside the outline of the crown.What is the purpose of the flaring?
Primary MolarsFlaring allows for room that is required for the development of permenant teeth
How many primary teeth do we have normally?How are teeth notated?
20-10 Upper and 10 LowerLetter A-T
These teeth are NOT in the Primary Dentition
Premolars-Permenant Premolar will arise in the place of primary molars
When do primary teeth begin calcification
4-5 months in utero
At what age should all the primary teeth have erupted normally?
By Age 2-3 years old
1 to 2 years after the teeth erupt denotes what stage in root formation.
Roots should be completing formation Between age 4 and 5
Roots begin to resorb 2-3 years before ____.
With the Eruption of the PERM. 1st Molar at age 6They erupt distal to Primary 2nd Molars
T or F:Perm Molars have Predecessors.
False:Perm Molars have NO Predecessors. They erupt distal to the primary molars which are in the place of the Perm Premolars
Eruption Sequence of Primary Teeth
Eruption Sequence of Primary Teeth
Which arch erupts first?
1st to erupt:
Mandibular Central Incisor
2nd to erupt:
Maxillary Central Incisor
3rd to erupt:
Mandibular Lateral Incisor
4th to erupt:
Maxillary Lateral Incisor
5th to erupt:
Mandibular First Molar
6th to erupt:
Maxillary First Molar
7th to erupt:
Mandibular Canine
8th to erupt:
Maxillary Canine
9th to erupt:
Mandibular Second Molar
10th to erupt:
Maxillary Second Molar
Primary Teeth eruption can be expected between age ___ and ___.
6 months - 2 years
Name That Tooth
Name That Tooth
Eruption: 6-10 monthsRoot Completion: 1.5 years
Mandibular Central Incisor
Eruption 8- 12 monthsRoot Completion: 1.5 years
Maxillary Central Incisor
The Mesiodistal Diameter is greater than the Gingivo-incisal length.Ligual Aspect of crown shows well developed marginal ridges and highly developed cingulumCingulum extends towards incisal ridge and divides the lingual concavity
Maxillary Central Incisor
Has Marginal Ridge and CingulumLingual Portion of the crown converges so that is narrower toward lingual than toward labialThe incisal ridge is straight and biscets the crown facio-lingually
Mandibular Central Incisor
Eruption: 10-16 MonthsRoot Completion: 1.5 years Larger than primary mandibular central incisor in all dimensions EXCEPT _____.Bigger Cingulum and Lingual surface more concave than Mandibular Central Incisor
Mandibular Lateral IncisorSmaller Facio-Lingually than Manibular Central Incisor but Larger in all other dimensions
Eruption, Root Completion and Characteristics of Maxillary Lateral Incisor?
Eruption: 9-13 monthsRoot Completion: 2 yearsCrown is smaller in ALL dimensions when compared to Central Gingivo- Incisal length is GREATER than mesiodistal width
Which cells are the most abundant in the pulp?What is there function- 2 things?
FibroblastMake the Collagen and Ground Substance of the Pulp. Alter structure of pulp in disease
What are the 4 cell types of the pulp?
Odontoblast- make dentinHistiocytes- inactive macrophagesReserve Cells- undifferentiated cells for injuryFibroblast- collagen and ground substance synthesis, alter pulp structure during injury
What is Ground Substance?-Where is it?-What is in it?-What is it composed of?-It is AKA?
Between cell material in which cells and fibers of connective tissue are embedded.It is made up of water and Long Carbohydrate Chains attached to protein backbonesMatrix
Are blood vessels, lymph vessels, and nerves found in the pulp?
Classification of Pulp?-What type of tissue is pulpal tissue?
Loose Connective Tissue -made up of collagen and reticulin fibers
What is Reticulin Fibers
Scleroprorotein found in lymphatic tissue (immune tissue- composed of lymphocytes- B and T cells)
Why are the teeth of young people and children more sensitive to thermal change and dental operative procedures than older people?
B/C they have a Larger Pulp Chamber than adults. The Pulp chamber will decrease in size as root formation completesBOOK: Because on newly erupted teeth the dental pulp is large. With time as the root formation completes it will become smaller. THUS, during this period the tooth is sensitive because the pulp has nerve endings that communicate to the body PAIN.
T or F: Due to the type of sensory nerve fibers in the pulp, cold, heat, chemicals, and touch sensation are all interperted as pain?
Pulp is of ____ orgin and Derived from _____.
Primary Function of Pulp
Production of Dentin
What CT does the dental pulp develop from?What other portion of the tooth is derived from this CT?
Dental PapillaDENTIN is also derived from the dental papilla
Condensation of Ectomesenchymal Cells (Odontoblast) which give rise to DENTIN and PULP
What is the Dental Sac?
Surrounds the Enamel Organ and the Dental Papilla. It will form the CEMENTUM and PDL
What is the Enamel Organ?
Mass of ectodermal cells budding off of the dental lamina which will synthesize ameleoblast to make ENAMEL
Where is the Coronal Pulp?
In the Pulp Chamber and pulp horns
Where is the Radicular Pulp?
In the Pulp Canals
What does the Apical Foramen communicate with?
Communicates w/ the PDL
What is the path of the Accessory Canals?
Extend from the pulp canal throught the root dentin to the PDL
Central Zone of the Pulp is AKA what?What are its zones from inner to outermost?
Pulp Proper- contains large nerves and blood vesselsInner to Outermost:Pulpal CoreCell rich zoneCell free zone (zone of Weil)Odontoblastic layer
What does the pulpal core resemble?
The cell rich zone
The cell rich zone is composed primarily of these cells?
What 2 things are located in the Cell free zone?
Capillaries and Nerve Plexus (Plexus of Raschkow)
What is in the odontoblastic layer and where is it located next to?
Odontoblast and lises next to predentin and mature dentin
Dental Organ= what 3 structures?
Enamel Organ + Dental Papilla + Dental Follicle
Ontogeny means
Life History
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