Exam #2 Flashcards
Total number of primary teeth
20
How are primary teeth named?
Letters #A-#T
All teeth have combinations of raised or convex areas (_______ anatomy) and depressed or concave areas (_______ anatomy)
positive, negative
Which anatomy is formed first, positive or negative
positive- this in turn properly displays the negative anatomy
These ridges descend from the tips of the cusps and travel towards the central part of the occlusal surface
triangular ridges
What ridges are found ONLY on posterior teeth
triangular ridges
How many triangular ridges do posterior tooth cusps have?
only ONE per cusp
Triangular ridges are ____ at the base than at the cusp tip
wider
When does calcification commence in utero?
13-16 weeks
What is the sequence of first evidence of calcification?
Central Incisor> 1st Molar > Lateral Incisor > Canine > 2nd Molar/ premolars > 3rd Molars
When have ALL primary teeth initiated calcification
18-20 weeks
Primary anterior teeth form from only a ________ center of calcification
single
Are mamelons present on deciduous teeth?
no
Are developmental depressions found on primary teeth?
no
From birth to one year of age, the following permanent teeth are initiating calcification:
- First molar
- Central incisor
- Canine
- Lateral incisor
From 2 to 4 years of age, the following permanent teeth are initiating calcification:
- Premolars
2. Second molars
When have third molars begun calcification?
9 years of age
What teeth only have ONE antagonist in the opposing arch?
Mandibular central incisors and Maxillary 3rd molars
What are the 3 items to note on occlusal antagonists in the opposing arch?
- Teeth primarily contact their namesakes in the opposing arch.
- Most teeth contact one additional tooth in the opposing arch
- The Maxillary 3rd Molar and the mandibular central incisors are the exceptions (They have only 1 antagonist)
The cervical line curves in a ___ direction on the ___ surface.
coronal, proximal
The measurement of the height of the curvature of the cervical line is from the ___ point to the ___ point in the middle of the proximal surface.
lowest, highest
The ___ teeth have the most measurable curvature. The ___ have little or no curvature.
anterior, molars
On an individual tooth, the curvature is always greatest on the ___ side. The mesial of the maxillary central is __ mm. The distal of maxillary central is __ mm.
mesial, 3.5 (largest), 2.5
Circumferential periodontal fibers are located
at the cervical third of the crown and root of a tooth
What do circumferential periodontal fibers influence
rotation of a tooth within an alveolus
_______ and ______ embrasures are evident from a facial viewpoint
Gingival and incisal/ occlusal
Largest embrasure is between ______ and _______
canine and 1st premolar
Smallest embrasure is at ______
the midline
Above or occlusal to the contract area, embrasures are called ______ in anterior teeth and ______ in posterior teeth
incisal, occlusal
What portions of the crown are generally more developed mesial or distal
mesial
Which cusps are LARGER
mesial cusps
Mesial marginal ridges are usually ______ than distal marginal ridges (What is the exception_
taller, mandibular 1st premolar
molars taper in which direction?
mesiodistally
All teeth taper ________ except the _______ and the _____
faciolingually except for the maxillary 1st molar and the Y-grooved mandibular 2nd premolar
