Quiz 1 Review Flashcards
What is the Cementoenamel Junction (CEJ)?
Junction or separation between the crown and the root or cementum and enamel
What dental surface covers the root?
Cementum
What dental surface covers the crown?
Enamel
What are lingual heights of contour?
Raised contours on lingual surfaces of posterior teeth
What is the anatomical root?
Anatomical root: portion of tooth covered in cementum
Clinical root:
Anatomic crown vs. clinical crown
Anatomical crown: portion of tooth covered by enamel
Clinical crown: portion of tooth that is clinically visible, varies with age
Where are lingual fossae found?
canines
Supplemental (secondary) grooves
- line on the surface of a posterior tooth that does not divide the primary portions of a tooth
- Usually not named
- May not always appear consistently on a posterior tooth
- Separate a triangular ridge from a cuspal ridge
- Named according to their location
What are irregular depressions or concavities that are unique to the lingual surfaces of canines that divide the lingual fossae of canines into separate mesiolingual and distolingual fossae?
Lingual Fossae
What tooth is the last primary tooth to erupt?
maxillary secondary molar (A, J) at 29 months
What is the first primary tooth to erupt?
mandibular central incisor (P, O) at 8 months
Emersion vs. Eruption
Emersion: stage of tooth development as it first appears through gingiva
Eruption: continuous movement of tooth as it develops from its initial calcification stage until it reaches occlusal contact with a tooth in the opposing arch
When does the mixed dentition period begin?
emergence & eruption of the permanent mandibular 1st molar at age 6
When does the mixed dentition period end?
loss of the last primary tooth
What are the permanent 1st molars guided by?
primary 2nd molars
When do permanent teeth begin their eruptive movements?
after the crown has formed
What does premature loss of primary teeth lead to?
lack of space for permanent dentition
T/F dental neglect, congenital absence, or abnomalies will have an adverse effect on the eruption of permanent dentition
True
What is the first tooth to erupt in the maxillary arch?
1st molar
What is the order of maxillary tooth eruption?
1st molar central incisor lateral incisor 1st premolar 2nd premolar canine 2nd molar 3rd molar
At about 8 years of age what permanent teeth have not yet erupted in the mouth?
permanent 2nd molars
pre-molars
canines
What type of arch of alignment do humans have?
partially isognathous: partially symmetrical
What teeth have an anterior transverse ridge?
permanent maxillary molars (mainly 1st)
What is the anterior transverse ridge confluent with?
mesial marginal ridge, obliterating much of the mesial triangular fossa
Which arch is larger?
Maxillary arch
Which arch is wider?
Maxillary arch
Which arch has more issues with asthetics?
Maxillary arch
Which of the tooth in the mandible deviates the least from the vertical axis (proximal reference)?
2nd premolar (6 degrees)
Which tooth in the mandible deviates the most from the vertical axis (proximal reference)?
lateral incisor (23 degrees)
Which of the tooth in the mandible deviates the least from the vertical axis (facial reference)?
lateral incisor (0 degrees)
Which maxillary tooth contact only one tooth on the mandibular arch?
maxillary third molar
Which mandibular tooth contact only one tooth on the maxillary arch?
mandibular central incisor
Where is midline proximal contact point between?
Incisal third
Where is the distal of central?
Junction of incisal and middle thirds
What teeth have a 1 mm height of contour?
mandibular molar teeth
What tooth deviates the most from the vertical axis (facial reference)?
Second molar (14 degrees)
What is the proximal contact area distal of central?
junction of incisal and middle thirds
What is the proximal contact area mesial of lateral?
junction of incisal and middle thirds
What is the proximal contact area distal of lateral?
middle third
What is the proximal contact area mesial of canine?
Junction of incisal and middle thirds
What is the proximal contact area distal of canine?
middle third
What is the mandibular facial surfaces height of contour?
0.5 mm in the cervical third
What is the mandibular anterior teeth lingual surface amount of contour and location?
0.5 mm, cervical third
What is the mandibular first premolar teeth lingual surface amount of contour and location?
0.5 mm, middle third
What is the mandibular second premolar teeth lingual surface amount of contour and location?
0.75 mm, middle third
What is the mandibular molar teeth lingual surface amount of contour and location?
1 mm, middle third
Where does the cervical line curve?
in the coronal direction on the proximal surface
What is the height of curvature of the cervical line?
measurement from the lowest point at the vertical line to the highest point in the middle of the proximal surface
What teeth have the most measurable curvature?
anterior teeth
What teeth have the least curvature?
molars
On an individual tooth what side has the greatest curvature?
The curvature is always greatest on the mesial surface
What is the curvature on the mesial side of the maxillary central?
3.5 mm (largest of all teeth)
What is the curvature of the distal side of the maxillary central?
2.5 mm
Where does periodontal disease affect the integrity of the periodontal fibers?
level of the cervical line (alveolar crest)
What are imbrication lines?
negative anatomy resulting from an overlapping of enamel at the cervical third, run parallel to the cervical line
What is perikymata?
positive anatomy that define the imbrication lines
Where are imbrication lines and perikymata mostly seen?
permanent maxillary central incisors
On mandibular teeth what surface are the contact areas slightly more towards?
facial
On mandibular teeth are mesial outlines of crowns more or less curved than distal outline?
mesial outlines are less curved than distal
On mandibular teeth are lingual or facial cusps more pointed?
lingual cusps are more pointed
On mandibular teeth are mesial or distal cusps larger?
mesial cusps are larger
On mandibular teeth are mesial marginal ridges or distal marginal ridges taller?
mesial marginal ridge are taller