Exam 2 Review Flashcards
How many primary teeth?
20, Lettered A - T beginning with the primary maxillary right second molar
Which type of anatomy (positive or negative) is formed or constructed first?
Positive anatomy is formed or constructed first, which then properly displays the negative anatomy
Which type of ridges descend from the tips of the cusps of only posterior teeth and travel toward the central part of the occlusal surface?
Triangular Ridges
Which teeth have triangular ridges?
Posterior Teeth
T or F, each posterior tooth cusp has exactly two triangular ridges
false, Each posterior tooth cusp has only ONE triangular ridge.
T or f, Triangular ridges are wider at the base than at the cusp tip
True
At what weeks in utero does calcification commence?
At about 13-16 weeks
What is the sequence of first evidence of calcification?
Central incisor --> 1st molar --> Lateral Incisor --> Canine --> 2nd Molar
At what weeks in utero have all primary teeth initiated calcification?
At 18-20 weeks in utero
Which teeth form from only a single center of calcification?
Primary Anterior Teeth
How many mamelons and developmoental depressions are evident in primary anterior teeth?
None
Which permanent teeth are initiating calcification from birth to one year of age?
First Molar
Central incisor
Canine
Lateral incisor
Which permanent teeth are initiating calcification from two to four years of age?
Premolars
Second Molars
Which teeth have begun calcification by 9 years of age?
Third Molars
Which classification of cusp forms is characterized by Four cusps in a rectangular or rhomboid form?
Quadritubercular Molar
Which teeth have only ONE antagonist in the opposing arch?
The maxillary third molars
Mandibular central incisors
T or F, Teeth primarily contact their namesakes in the opposing arch. Most teeth contact one additional tooth in the opposing arch
True
T or F, On mandibular teeth, the cervical line curves in a radicular direction on the proximal surface
False, it curves in a coronal direction
What are the two measurement points for the height of curvature of the cervical line on mandibular arch?
From the lowest point at the cervical line to the highest point in the middle of the proximal surface
Which teeth have the most measurable curvature in the height of curvature in the mandibular arch?
Anterior teeth
How much height of curvature do molars have on the mandibular arch?
Little or no curvature
On mandibular arch, which side of tooth has the greatest curvature?
The mesial aspect
The measurement of the mesial mandibular central? Measurement of distal mandibular central?
- 0 mm (largest)
2. 0 mm
What portion of the tooth are circular (circumferential) periodontal fibers found and what is their purpose?
- Located at the cervical third of the crown and root of a tooth
- Influences the rotation of a tooth within an alveolus
Where is the largest embrasure in the maxilla?
Between canine and 1st molar
Where is the smallest embrasure in the posterior maxilla?
Between 1st and 2nd molars, However the smallest embrasure is at the midline
Which portion of crowns are generally more developed?
Mesial portions are generally more developed than the distal
Which cusps are generally larger?
The mesial cusps are larger than distal cusps
Which marginal ridges are usually taller?
What is the exception to this rule
Mesial marginal ridges are usually taller than the distal marginal ridges (an exception is the mandibular first premolar!!!!!!)
Molars taper in what direction?
Mesiodistally
All teeth taper in which direction? Are there exceptions to this rule?
Taper Faciolingually
- Except the maxillary first molar & the Y-grooved mandibular second premolar
T or F, Molar roots of primary teeth are straight and point inward at the root apices
False, They flare markedly and thin out rapidly as the apices are approached
T or F, Primary roots are narrow and short when compared to crown width and length
False, Narrow and LONG when compared to crown width and length
Primary Mandibular Canines: (Facial) What is the difference between this tooth and the maxillary canine?
- Very similar in form & size to the maxillary canine
- except that the specific anatomy is less developed
Primary Mandibular Canines: (Facial) What are the size differences in the crown and root in comparison to the maxillary canine?
- Crown may be 0.5 mm shorter
- Root may be 2.0 mm shorter
Primary Mandibular Canines: (Facial) The cusp tip is what direction of the center line? Which cuspal ridge is longer?
- Cusp tip is mesial of center
- Distal cuspal ridge is longer than mesial cuspal ridge (this is opposite of the maxillary canine)
Primary Mandibular Canines: (Facial) T or F, Both the maxillary and mandibular canine have a cusp tip that is mesial of center and a longer distal cuspal ridge than mesial cuspal ridge
False, Those specs are true of mandibular canines but opposite to the maxillary canine
Primary Mandibular Canines: (Facial) Does the root tip display any curvature?
No, usually does not display any curvature
Primary Mandibular Canines: (Facial) T or F, Mesial outline of the crown is straight, while the distal outline is convex
TRUE
Primary Mandibular First Molar: (Occlusal) What is the crown outline form shape?
Rhomboidal
Primary Mandibular First Molar: (Occlusal) Primary mandibular molars are wider in which directional surface?
Wider mesiodistally than they are faciolingually
Primary Mandibular First Molar: (Occlusal) Which line angle is quite prominent?
Mesiofacial line angle
Primary Mandibular First Molar: (Occlusal) Cusp sizes in order of largest to smallest:
Mesiofacial
Mesiolingual
Distofacial
Distolingual
Primary Mandibular First Molar: (Occlusal) What developmental grooves are present?
Long Central developmental groove
Short facial developmental groove
Short lingual developmental groove
Primary Mandibular First Molar: (Occlusal) What major fossae exist on the surface?
Central, Mesial triangular fossa, Distal triangular fossa
Primary Mandibular First Molar: (Occlusal) Which directions does the crown converge?
To the lingual and to the distal
Primary Mandibular First Molar: (Occlusal) T or F, the primary mandibular 1st molar resembles the permanent mandibular canine
false, Primary mandibular 1st molar does not resemble any other primary or permanent tooth in human dentition
Primary Mandibular Second Molar: (Facial) The crown form resembles what other tooth?
Permanent mandibular first molar
Primary Mandibular Second Molar: (Facial) Proximal contact areas are in what portion of the crown?
Middle third of the crown
Primary Mandibular Second Molar: (Facial) Which cusps are visible from the facial view and which are all close to the same size?
- All five cusps are visible from the facial view
- All three facial cusps (mesiofacial, distofacial, and distal) are all close to the same size
Primary Mandibular Second Molar: (Facial) Cervical line looks like what?
Has an apical dip in the area of the birfurcation
Primary Mandibular Second Molar: (Facial) How many roots and which is longer?
Two roots on tooth
- Mesial root is longer than the distal root
Primary Mandibular Second Molar: (Facial) T or F, Both roots are narrow mesiodistally and wide faciolingually. The roots and short and slender with a characteristic flare.
- 1st statement true
- 2nd statement false –> long and slender
Primary Mandibular Second Molar: (Facial) Which mandibular molar is larger? Is this tooth larger than its permanent replacement?
Mandibular second molar is larger.
- It is also larger than its permanent replacement (mandibular second premolar)
Tetracycline staining of the teeth is known as what primarily involving what part of the tooth
- Known as intrinsic or internal staining of the teeth, involving primarily the dentin
T or F, The structure of the teeth is compromised by the intrinsic staining
False, It is not compromised
What causes tetracycline staining of the teeth?
Usually caused by antibiotic therapy administered during the formative stages of tooth development
Do dental bleaching material and procedures help eliminate tetracycline staining of the teeth.
They have little success in eliminating these deep, internal stains
What is the best way to overcome the esthetic problems of tetracycline staining of the teeth
These patients will need to have veneers or full crown porcelain restoration
Which tooth generally displays dens-in-dente?
Permanent maxillary lateral incisors
