Quiz 2 Flashcards
Maxillary lateral incisors generally erupt in which direction?
Toward primarily the lingual side
What is Ectopic Eruption?
A condition that is exhibited when a tooth erupts or emerges in the wrong position within the arch.
Maxillary Canines ectopically erupt towards which side?
Primarily the facial side
Ectopic eruption occurs usually towards which two directions?
Facial and Lingual directions
What is transposition when speaking about ectopic eruption?
A tooth that is located in a different position from where it is supposed to be
Transposition is most commonly seen in which teeth?
Common in Canines. More in Maxillary canines than in Mandibular canines
What is the most commonly rotated tooth? Which is second and third most common?
- Maxillary 2nd premolar
- Maxillary incisors
- Maxillary 1st premolar
What teeth are Dens-in-Dente found in?
Permanent Maxillary Lateral Incisors
Only permanent
What is Dens-in-Dente also known as?
Dens invaginatus
What is occurring in dens invaginatus?
Outer enamel surface is folded inward.
What is thought to cause Dens-in-Dente?
It results from an infolding of the dental papilla during tooth development
What forms of dens invaginatus exist?
Coronal and Radicular forms exist
How do the teeth appear in a patient with Dentinogenesis Imperfecta?
The teeth are discolored.
Commonly a blue-gray or yellow-brown color
Also may present with translucent appearance
What kind of affect may dentinogenesis imperfecta have on the construct of the teeth?
The teeth have weaker construct than normal teeth making them prone to degradation and eventual loss
Does dentinogenesis imperfecta affect Primary, Permanent or both types of teeth
Both permanent and primary
What do teeth exhibit radiographically in a patient with dentinogenesis imperfecta
Radiographically, they exhibit a partial or total absence of pulp chambers and root canals
What are the 4 major contrasts between primary and permanent teeth?
- Primary teeth are smaller in overall size and crown dimension
- Primary teeth have markedly more prominent cervical ridges and are narrower at their “necks”
- Primary teeth are lighter in color
- Primary posterior teeth (molars) have roots that are more widely flared
T or F, Permanent Mandibular Lateral incisor is smaller than the central incisor
False, Central incisor is smaller than the lateral incisor
Which of the two permanent mandibular incisors is more angular
Central incisor is slightly more angular
Explain similarities and differences of roots in permanent mandibular incisors
- Both roots have mesial and distal root surface depressions
- Both roots are rarely bifurcated
- Lateral incisor more frequently exhibits two pulp canals
Which perm. mand. incisor edge is straight and which isn’t? What is specific behind the one that isn’t?
- Incisal edge is straight on the CENTRAL incisor
- Incisal edge of the lateral incisor exhibits a LINGUAL twist to the distal portion.
Which perm. mand. incisor has bilateral symmetry and which does not?
- Central incisor exhibits bilateral symmetry
- Lateral incisor exhibits a “twisting” slightly on its root base when viewed from incisal
T or F, the crests of the cingulum on both incisors are offset slightly to the DISTAL
True, READ IT ONE MORE TIME
Explain the lingual surface anatomy on perm. man. incisors
Both have inconspicuous lingual surface anatomy compared to their maxillary counterparts
Where are the contact areas of the perm. man. incisors?
Located in the incisal third, but the central incisor is said to exhibit less incisal embrasure space than the lateral incisor
From a proximal view, what is the display of the incisal edge on perm. man. incisors?
They display an incisal edge that is lingually positioned in comparison to the height of curvature of the CEJ and their respective root apices.
What is special about the incisal ridge on Perm. Mandibular Lateral incisors?
- The incisal ridge will be LINGUAL to the faciolingual bisector of the crown outline in its entirety.
- However, the Distal end of the ridge will be more toward the lingual than the mesial end.
What shape is used to define the crown outline of the facial aspect of perm. man. central incsors
Trapezoidal with the longer parallel side at incisal edge
Explain the incisal edge at both the mesial and distal incisal line angles of perm. man. central incisors
- Incisal edge is straight and at a right angle
- Mesial and distal incisal line angles are both said to be sharp (almost 90 degrees)
- Distal incisal line angle is slightly more rounded than the mesial incisal line angle
At which level are the mesial and distal proximal contacts of the Perm. Man. Central incisors?
Mesial and distal proximal contacts are at the same level and are within the incisal one-third of the crown
After incisal wear in the perm. man. central incisors, where are the proximal contacts?
May be very near the incisal edge
Explain the incisal one-third of the crown surface? What about the cervical two thirds?
Incisal 1/3 - Relatively flat
Cervical 2/3 - Convex
Which perm. maxillary incisor is larger and more angular
Central is larger and more angular
Which perm. maxillary incisor has a straighter root
Central incisor has a straighter root, while the lateral incisor has a root that is often curved or pointed to the distal.
Describe the shapes of the perm. maxillary incisors at the incisal third
Central incisor: fairly flat at incisal third
Lateral incisor: Convexity at incisal third
Which of the perm. maxillary incisors is more variable?
Central incisor: Exhibits minimal variation
Lateral incisor: One of the most variable permanent teeth
Explain location of cingulum in perm. max. incisors
Crests of cingulum on both incisors are offset to the distal
What are the shapes of the lingual fossa of each of the perm. max. incisors?
Central incisor: has a trapezoidal shaped lingual fossa
Lateral incisor: has a triangular shape fossa
How much of the lingual surface of the crown does the lingual fossa occupy on the perm. max lateral incisor?
The incisal two thirds of the lingual surface of the crown
Define the boundaries of the lingual fossa of the perm. max. lateral incisor
- Linguo-incisal ridge
- Mesial and distal marginal ridges
- Cingulum
How much of the lingual surface occupy on the perm. max. lateral incisor?
Cingulum is limited to the cervical 1/3 of the crown and the mesial and distal marginal ridges form a “V” as they flow into the cingulum
What is the shape of the lingual fossa of the perm. max. central incisor
Wide, shallow “dish-shaped” depression
- Trapezoidal in shape
Perm. Max. Central Incisor: What are the cervicoincisal length, Mesiodistal width and Faciolingual depth?
Cervicoincisal length: 10.5 mm
Mesiodistal width: 8.5 mm
Faciolingual depth: 7.0 mm
T or F, All four cusps are visible from the mesial view on the primary mandibular first molar
False, Only from the distal view
What all (cusps and roots) is visible from the distal view when looking at the primary mandibular first molar
All four cusps are visible from distal view
Both roots are visible from this view
Name the 5 cusps from largest to smallest on the primary maxillary second molar
Mesiolingual, Mesiofacial, Distofacial, Distolingual and 5th cusp (cusp of carabelli)
Where is the distinct transverse ridge of the primary maxillary second molar
It involves the triangular ridges of the mesially-positioned cusps
Which portion of the primary maxillary first molar is extremely convex?
Facial cervical ridge
How many roots are evident in the mesial view on the primary maxillary first molar?
Only 2 roots are evident from this view because the mesiofacial root is super-imposed over the distofacial root
What is the crown outline of the primary maxillary canine
Diamond or arrow shaped
Explain the cuspal ridge of the primary maxillary canine
Slightly distal of the center of the tooth
Mesial cuspal ridge is slightly longer than the distal cuspal ridge
Look over slides 2,3,4,19,20,21
Don’t have flash cards for these
