Flashcards in Dental Anatomy III - Test I Deck (112):
What crown remains static throughout a lifetime?
In what direction?
What are the 2 types of triangular ridges emanating off of cusps?
Where do lingual ridges extend to/from on Canines?
Cusp tip to Cingulum
What process occurs in the tooth follicle?
What does the follicle contain?
Center of Calcification
What develops from "lobes"?
*cusp tips/Incisal edges
What forms Negative Anatomy?
Merging centers of calcification
What develops last in the tooth?
*ending with Apex
In what direction does Calcification occur?
From Incisal edges/cusps to apex
*Apical 1/3 of root calcifies last
What are the 3 Primary teeth to first complete Root Formation?
At what age?
Maxillary Central Incisor
Mandibular Central/Lateral Incisors
What 2 Primary teeth calcify last?
What age is typical for all teeth to have emerged except the Primary 2nd Molars?
At this stage, what is happening to the Permanent teeth?
When does Calcification of Primary dentition begin?
13-16 weeks In Utero
When have all Primary teeth initiated calcification?
18-20 weeks in utero
Maxillary teeth usually erupt before their Mandibular counterparts
Males usually erupt Primary dentition before females
Initial Mineralization of Primary Dentition is entirely prenatal
What is the last primary tooth to emerge?
At 3.25 years, what is usually complete?
When does the Primate Space begin to form?
When is Primary tooth occlusion evident?
List the permanent teeth that are succedaneous to the primary teeth.
C. and L. incisors
1st and 2nd Premolars
*premolars replace molars
What 2 teeth emerge around 11 years?
In what order?
Mandibular 2nd Premolar
In a Haplodont, what cusp is Maxillary?
In the Triconodont and Tritubercular, what cusps are Maxillary?
Paracone, Protocone, Metacone
Paraconid, Protoconid, Metaconid
*these are listed mesial to distal
**Protoconid always middle
Match the following terms in Humanoid Mandibular Molars:
Distal cusp (accessory cusp)
What are the Proximal reference angles for the following Maxillary teeth:
What are the facial reference angels for the following Maxillary teeth:
From the vertical axis, the least deviation is seen in which teeth?
(2 teeth, 2 views)
(2 degrees, facial view)
(5 degrees, proximal view)
Why is the ideal plane of occlusion not flat?
Too many contacts in posterior teeth
What does a proper plane of occlusion allow for?
What does a curved plane of occlusion allow for?
Maximum use tooth contacts during function
What shape does the Proximal Contact Area have in Anterior incisal Teeth?
*contact creates embrasures
What Proximal Contact area of the Mandibular Anterior Teeth is not in the Incisal Third?
Distal of Canine
What type of Proximal Contact point is absent in the Mandibular Anterior Teeth?
*Incisal or Middle 1/3 (for distal canine)
In what direction does the Proximal Cervical Line bend in the Mandibular Arch?
Where/Measurement in largest bend?
C.I. 3.0 mm mesial and 2.0 mm distal
What Periodontal fibers resist impaction of tooth into alveolus?
What Periodontal fibers help maintain proximal contacts?
Name 8 types of Periodontal Fibers
Both permanent and primary teeth taper faciolingually. What is the consistent exception?
What are the 2 occasional exception?
Permanent Maxillary 1st Molar
Mandibular 2nd Premolar (Y type)
Primary Maxillary 2nd Molar
What 2 types of line angles are usually more developed?
4 points of comparison for Primary vs. Permanent molar
Prominent Cervical Ridges
Widely separated Roots
How does the Cervical 1/3 compare in Permanent vs Primary molar?
Primary Maxillary Lateral Incisor - Incisal view
Incisal ridge curves toward...
What is the crown shape of the Facial View of the Primary Maxillary Canine?
Where is the cusp positioned in the Primary Maxillary Canine?
Makes what Cuspal Ridge longer?
Mesial cuspal ridge
How is the Facial Ridge positioned in the Primary Maxillary Canine?
Slightly on Distal half
The root length is ____ the crown length in the Primary Maxillary Canine
The root is curved...
What cusp is not visible in the Mesial view of the Primary Maxillary 2nd Molar?
How many other cusps are there?
Which mesial cusp of the Primary Maxillary 2nd Molar is larger?
What separates the lingual and facial in the Mesial view of the Primary Maxillary 2nd Molar?
Mesial Marginal Ridge groove
How does the crown of the Primary Maxillary 2nd Molar converge from the mesial view?
Cervical line curvature?
What roots are notable from the Mesial view of the Primary Maxillary 2nd Molar?
How many roots visible from this view?
Lingual deviates outside crown
The roots of the Primary Maxillary 2nd molar are longer than the 1st.
What root takes up 2/3 of the CEJ in the Primary Maxillary 2nd molar?
What is the length of the Root Trunk from the mesial view of the Primary Maxillary 2nd Molar?
The mesial surface outline of the Primary Mandibular 1st molar is curved
Where are the proximal contact areas of the Primary Mandibular 1st Molar?
Occlusal portion Middle Third
From the facial view of the Primary Mandibular 1st Molar, what cusp is larger?
What separated cusps?
Facial developmental groove (indistinct)
Describe the cervical line from the facial view of the Primary Mandibular 1st Molar
Describe cervical ridge
Describe Mesial Root
Dips apically in Mesial half
Convex Mesial half
Longer and straighter
How much bigger is the crown and root in the Mesial portion of the Primary Mandibular 1st Molar?
Crown 20% taller
Root 1/3 longer
What cervical crown is more prominent in the Primary Mandibular 2nd Molar?
Where is the lingual height of contour?
Describe the Mesial Marginal Ridge in a Primary Mandibular 2nd Molar.
Deep marginal ridge groove
(obscures other topography from mesial view)
The height of curvature of the cervical line in the Primary Mandibular 2nd Molar is minimal from the mesial view
What roots can be seen in the Primary Mandibular 2nd Molar from the mesial view?
Describe the Mesial Root of the Primary Mandibular 2nd Molar.
Long Root Surface Depression
Blunt, serrated Apex
Where is the long root surface depression of the mesial root in the Primary Mandibular 2nd Molar deepest?
Coronal and radicular forms of Dens-in-Dente exist
What results from an infolding of dental papilla during development?
What tooth usually affected?
Lateral Maxillary Incisor
What is usually found in distal 1/3 of molars and facial root furcations?
What are Enamel Projections?
Extensions crown onto root surface between roots
How much shorter is the crown of the Maxillary L.I. compared to the C.I.?
How much less is the crown width?
Describe the crown outline of the Maxillary Lateral Incisor.
Where is the mesial proximal contact area for the Maxillary Lateral Incisor?
Distal contact area?
Junction incisal and middle 1/3's
What direction does the root apex of the Maxillary Lateral Incisor curve?
How will the incisal edge of the Mandibular Central Incisors be positioned?
How much bigger is the enamel edge on the facial side of the Mandibular Central Incisors?
What are 2 prominent features of the root in the Permanent Mandibular Central Incisor?
Blunt root end
Wide longitudinal root depression extending most of length of root
Canines are the longest teeth in the mouth, contribute "canine guidance" to functional occlusion, are considered anterior teeth, provides for smile line
What shape does a Permanent Maxillary Canine have from the Incisal view?
Where is the cusp located in the Permanent Maxillary Canine?
Slightly mesial and facial
*Never distal or lingual
Where is there a slight concavity seen in the incisal view of the Permanent Maxillary Canine?
The facial outline of the crown and root form what shape in the permanent Mandibular Canine?
C - shaped
(smooth with no visible concavity)
What cusp is taller in the Maxillary 1st Premolar?
By how much?
How are the cusp tips of the Maxillary 1st Premolar positioned?
What cuspal ridge is longer?
Describe the shape of the mesial and distal outlines of the Lingual Cusp of the Maxillary 1st Premolar.
The crown surface cervical to the level of the contact area will be concave and smooth
From what perspective is the root depression smaller and shallower in the Maxillary 1st Premolar?
It does not cross the cervical line
Describe the cervical 1/3 of the Root Trunk in the Maxillary First Premolar on the distal surface
Describe the Cervical Line and Cervical Ridge in the Maxillary 1st Premolar.
Line - little to no curvature
Ridge - 0.5 mm extension outward from the CEJ
What cusp ridge is shorter in the Maxillary 1st Premolar?
Where do triangular ridges meet in the Maxillary 1st Premolar?
What usually inhibits a transverse ridge from forming?
Center of Occlusal Table
Deep Central Groove
Describe the position of the central groove in the Maxillary 1st Premolar.
What does it connect?
What extension does it have?
Mesial and Distal triangular fossae
Mesial Marginal Ridge Developmental Groove
Marginal ridges of the Maxillary 1st Premolar are narrow mesiodistally
What does the cervical, distal, and mesial outlines of the Maxillary 2nd Premolar produce in appearance?
*this is lingual surface
Describe the root from the Lingual view in Permanent Maxillary 2nd Premolar
Narrower than Facial surface of root
Describe the roots of the Maxillary 2nd Premolar
Apex curves distally
What is found on the root of the Maxillary 2nd Premolar from the distal view?
*confined to root
Root depressions are found on mesial and distal aspects of the Maxillary 2nd Premolar and sometimes bifurcates
*Does not bifurcate
The distal contact area of the Maxillary 2nd Premolar is centered faciolingually
The mesial and distal cuspal ridges of the Maxillary 2nd Premolar are straight, unaligned, and meet facial cusp at an acute angle.
The occlusal table is ______ despite the cuspal ridges forming a _______
Continuous Elliptical Arc
Why does the Maxillary 2nd Premolar have a short central groove and wide marginal ridges?
Triangular fossae irregular and close together
What premolar is considered to be nearly bilaterally symmetrical from the facial view?
Mandibular 1st Premolar
Even though the Mandibular 1st Premolar is considered symmetrical, which cuspal ridge is longer?
Cusp ever so slightly mesial
How does the triangular ridge of the Mandibular 1st Premolar look from the mesial view?
Describe the Lingual Cusp Triangular Ridge and the Central Groove of the Mandibular
What angle is the crest of the Mesial Marginal Ridge in the Mandibular 1st Premolar?
Where is the mesiolingual groove located in the Mandibular 1st Premolar?
Mesiolingual line angle
Where is the Lingual Groove positioned in the Mandibular 2nd Premolar?
(this is 3 cusp variety)
Which cusp tip is shorter in the Mandibular 2nd Premolar?
By how much?
Mesiolingual (3 cusp variety)
The distolingual cusp tip is ____ shorter than the facial cisp tip in the Mandibular 2nd Premolar