Quiz 1 Flashcards
What is the Cementoenamel junction?
Other names for Cementoenamel Junction
CEJ
Cervical Line
- The junction or separation between the crown and the root or of the cementum and enamel
What covers the root of the tooth?
Cementum
What covers the crown of the tooth?
Enamel
T or F, On the lingual surfaces of posterior teeth, the raised or convex contours are called ridges
False, Are NOT called ridges. They are called “Lingual Heights of Contour”.
T or F, Lingual heights of contour are not in the cervical part of the crown
True
On what teeth would you find Lingual Fossae (plural)
On Canines
What are lingual fossae on canines?
Irregular depressions or concavities that are unique to the lingual surfaces of canines. They divide the lingual fossa of canines into separate mesiolingual and distolingual fossae
4 aspects of Supplemental (secondary) Groove
- A line on the surface of a posterior tooth that does NOT divide primary portions of a tooth
- Will usually not be names because they may not always consistently appear on the surface of a posterior tooth
- Many times, they will separate triangular ridges from cuspal ridges on the same cusp
- If present, supplemental grooves are named according to their location
What is the last primary tooth to erupt and when does it occur?
Maxillary 2nd molar
29 months
What is the first primary tooth to erupt and when does it occur?
First incisor at 8 months
At twenty months of age, which of the primary teeth have emerged
All of primary teeth (Incisors, Canines, First molar) except the second molars have emerged
The Transitional “Mixed” Dentition Period begins with what?
The emergence and eruption of the Permanent Mandibular 1st Molar at age 6
How does the Mixed Dentition period end?
With the loss of the last primary tooth, either the maxillary canine or usually the maxillary second molar at age 11-12
How are the permanent 1st molars guided as they emerge?
By and emerge distal or posterior to the Primary 2nd molars
When do the permanent teeth begin their eruptive movements?
Not until after the crown is formed
What may occur during the Mixed dentition period if you have premature loss of primary teeth?
May lead to a lack of space for the permanent dentition
What 3 things may have an adverse effect on the eruption of the permanent dentition?
Dental neglect
Congenital absence
Anomalies
What is the order of eruption for maxillary permanent teeth?
1st molar, Central Incisor, Lateral Incisor, 1st Premolar, 2nd Premolar, CANINE, 2nd Molar, 3rd Molar
- Canines lag behind anterior teeth and premolars
At eight years of age, what permanent teeth have erupted?
Central Incisors, Mandibular Lateral Incisor, 1st molars.
- No Canines, or premolars
Humans have an arch alignment that is considered what?
Partially Isognathous or not perfectly symmetrical
What is Isognathous?
Equal-jawed or symmetrical arch alignment
what is Anisognathous?
Unequal-jawed or asymmetrical arch alignment
Anterior Transverse Ridge is exhibited only on ?
Permanent Maxillary Molars and is confluent with the mesial marginal ridge, obliterating much of the mesial triangular fossa.
The maxillary arch form dominates or influences the mandibular arch form because of what 3 reasons?
- Maxillary arch is Larger than in the mandible, from the distal of a third molar on one side through the middle of each tooth to the third molar on the other side.
- Maxillary arch is wider or larger in measurement from right to left sides
- Esthetics are embedded more in the maxillary arch than in the mandibular arch, because the small line is extremely evident with maxillary anterior teeth
What is the Proximal reference angle for the Manidbular Second and First Premolar respectively?
Second Premolar: 6 degrees
First Premolar: 9 degrees.
Facial reference angle for the mandibular Lateral and Central incisors?
Lateral Incisor: 0 degrees
Central Incisor: 2 degrees
What two teeth show the least deviation from vertical axis in the mandibular teeth?
Lateral Incisor (Facial) Premolars (Proximal view)
Which teeth have only one antagonist in the opposing arch of occlusal?
Mandibular Central incisors
Maxillary third molars
Proximal contact areas of maxillary anterior teeth:
Midline, Distal of Central, Mesial of Lateral, Distal of Lateral, Mesial of Canine, Distal of Canine
Midline: Incisal Third
Distal of Central: Junctrion of Incisal and Middle thirds
Mesial of Lateral: Junction of Incisal and Middle thirds
Distal of Lateral: Middle Third
Mesial of Canine: Junction of Incisal and Middle thirds
Distal of Canine: Middle third
Height of Contour - Mandibular arch for All facial surfaces
0.5 mm located in cervical third
Height of Contour - Mandibular anterior teeth lingual surface amount of contour and location:
0.5 mm in the cervical third
Height of Contour - Mandibular first premolar teeth lingual surface amount of contour and location:
0.5 mm in the middle third
Mandibular second premolar teeth lingual surface amount of contour and location:
0.75 mm located in middle third
Mandibular molar teeth lingual surface amount of contour and location:
1 mm located in middle third
The cervical line curves in a _______ direction on the ________ surface
Coronal direction
Proximal surface
Measurement of height of curvature of cervical line is from the ______ point at the cervical line to the ______ point in the _______ of the ________ surface
lowest
highest
middle
proximal
What teeth have the most measurable curvature?
Anterior teeth
Molars have little or no curvature
On an individual tooth, the curvature is always greatest where?
On the mesial
Mesial of the maxillary central is ?
3.5 mm (largest)
Distal of maxillary central is?
2.5 mm
Perikymata denote what type of anatomy?
Positive anatomy
Imbrication lines indicate what type of anatomy?
Negative anatomy
Imbrication lines and perikymata are mostly seen on what teeth?
Permanent maxillary central incisors
Imbrication lines run parallel to what?
Cervical lines
Slide 19 and 21
Dude
