Exam 1 review (part 2) Flashcards
Which cusp is larger and taller on the primary mandibular first molar?
Mesiofacial cusp is larger and taller than the distofacial cusp
T or F, There is a short or indistinct facial developmental groove that looks more like a depression on the primary mandibular first molar
True
Describe the cervical line on the primary mandibular first molar
The cervical line significantly points or dips apically onto the mesial root surface on the mesial half of the tooth
Describe the cervical ridge on the primary mandibular first molar
Cervical ridge is quite convex in the mesial half, and fades out onto the distofacial cervical third
Which root is longer and more straight on the primary mandibular first molar?
the mesial root is much longer and more straight than the distal root
What is specific about the developmental groove on the primary mandibular second molar?
The tooth possesses a long and winding central developmental groove
What surface of the primary mandibular second molar possesses a distinct marginal ridge groove?
Mesial marginal ridge groove
T or F, the distal marginal ridge has a “notch” instead of a groove that splits it into two segments on the primary mandibular second molar
True
What separates the three cusps on the primary mandibular second molar?
Mesiofacial and Distofacial developmental grooves separate the three cusps
What are the major fossae on the primary mandibular second molar?
Central fossa, mesial triangular fossa & distal triangular fossa
T or F, There are significant triangular ridges located on each cusp, each involved in transverse ridges. (Primary mandibular second molar)
False, There are significant triangular ridges located on each cusp but none of them meet to form a transverse ridge
What is the most common location in the mandible for a permanent supernumerary tooth to exist?
the mandibular second premolar
Fusion of teeth is commonly seen in what teeth?
Maxillary second & third molars
T or F, Fusion always involves dentin during tooth fusion
True
How many independent pulp chambers and root canals can be seen in tooth fusion?
Two independent pulp chambers and root canals
T or F, fusion can never be the union of a normal tooth bud to a supernumerary tooth germ
False, Can also be the union of a normal tooth bud to a supernumerary tooth germ
What is tooth fusion?
Arises through the union of two normally separated tooth germs, and depending upon the stage of development of the teeth at the time of union, it may be either complete or incomplete
What is the outline of the root of permanent maxillary central incisor? Apex location?
Root is cone-shaped with a relatively blunt apex usually located slightly distal to center line of the tooth, with no evidence of root surface developmental depressions
T or F, The permanent maxillary central incisor is the hardest tooth to extract
False, it is easy to extract in that the clinician can rotate the tooth within the alveolus, without fear of fracturing the root or any osseous tissue
What is the crown length and width of the permanent maxillary lateral incisor compared to the central incisor
- Crown length is 1.0-1.5 mm shorter than the maxillary central incisor
- Crown width is 2.0 mm less than the maxillary central incisor
Describe the root apex of the permanent maxillary lateral incisor
Root apex typically has a distal curvature associated with it
How are the incisal ridge and root apex aligned in permanent maxillary lateral incisors
- The incisal ridge and root apex will NOT be in line with each other. Root is slightly facial
- Incisial ridge is centered faciolingually over the crown and main body of the root
Describe the incisal edge on permanent mandibular central incisors from the mesial view
Incisal edge will be lingual to the faciolingual long axis bisector.
- Enamel on the facial surface will extend apically about 0.5 mm more than it does on the lingual
Describe the incisal edge on permanent mandibular lateral incisors from the facial view
- Incisal edge is straight but it may appear slanted toward the distal
- Mesial incisal line angle is said to be a sharp 90 degree angle while the distal incisal line angle usually appears a little more rounded.
Where are the proximal contacts on the permanent mandibular lateral incisors
both within the incisal one-third of the crown and are considered to be at essentially the same level, however the distal contact is always considered to be slightly cervical than the mesial contact area
Is the permanent mandibular later incisor from a facial view considered to be symmetrical?
No, there is often more curvature in the distal crown outline
Describe the incisal ridge location on the permanent mandibular lateral incisors
The incisal ridge is located slightly toward the lingual surface when compared to the faciolingual long axis bisector that travels through the root apex
Where is the cusp tip located on the permanent maxillary canine
Cusp tip is either in line or slightly mesial to vertical center of the tooth. Never on the distal
- This means that the mesial cuspal ridge is shorter than the distal cuspal ridge
What is particularly important about the root of the permanent maxillary canine?
The apical one-third of the root usually has a distal curvature (it can also be mesial or even straight)
T or F, the cusp tip of a permanent maxillary canine from a distal view is distal to the root tip but is aligned with the height of curvature of the cervical line
False, The cusp tip of a permanent maxillary canine from a distal view is aligned with the root tip, and the height of curvature of the cervical line
What does the cervical line look like on a distal view of permanent maxillary canines?
Cervical line has a distinct curvature but not as significant as on mesial surface
There is a pronounced concavity located where on the permanent maxillary canine from a distal view?
It is cervical to the distal contact area
Location of cusp tip from mesial view on permanent mandibular canine
Lingual to the faciolingual bisector
What does the cervical line look like from a mesial view on a permanent mandibular canine
Significant incisal curvature of the cervical line ( more so than on the maxillary canine)
Is there a developmental depression on root surface of permanent mandibular canine from mesial view?
Root surface developmental depression is pronounced & deep on the root which increases the possibility of two canals and/or two roots in some specimens
The lingual cusp tip on permanent maxillary first premolar is how large compared to the facial cusp
Lingual cusp tip is less pointed and about 1.0 mm shorter than the facial cusp
The mesial and distal outlines of the lingual cusp will both be what on the permanent maxillary first premolar?
Slightly convex
A small amount of both the mesial and distal surfaces of the crown will be visible on the permanent maxillary first premolar
Yup, didn’t know how to make a flash card on this one
T or F, The mesial cuspal ridges of the facial and lingual cusps converge cervically from their respective cusp tips to meet the facial and lingual segments of the mesial marginal ridge (premanent maxillary first premolar)
true
The crest of the mesial marginal ridge is in what location compared to the faciolingual long axis bisector (perm. max. first premolar)
It is almost perpendicular to the faciolingual axis bisector
What is the mesial marginal developmental groove in relation to the perm. max. first premolar??
The mesial marginal ridge is divided into a facial and a lingual segment by the mesial marginal developmental groove which crosses the ridge from the occlusal surface and extends onto the mesial surface. Important to remember during restorative and periodontal treatment
The crest of the lingual segment on the perm. max. first premolar when looking at occlusal view is located where in relation to mesiodistal bisector of crown?
It is distinctly mesial
The facial cusp tip is located where in relation to the mesiodistal bisector on perm. max. first premolar?
It is distal to the mesiodistal bisector and one-third the distance from the facial outline to the faciolingual bisector of the crown
Occlusally the outline of which cusps is visible from the lingual view on a perm. max. second premolar?
the outline of both cusps is visible. The tip of the lingual cusp is in line with the tip of the facial cusp. It is nearly equal in height and a little more rounded than the facial cusp.
T or F, The cuspal ridges of the lingual cusp will not be as high occlusally as those of the facial cusp and will present the same angle of slant from the tip of the cusp
True
Describe the fossae on perm. max. second premolar
Tooth has mesial and distal triangular fossae that are irregularly shaped. They are nearer the center of the tooth when compared to the triangular fossae on the maxillary first premolar.
T or F, The perm. max. second premolar is described as having a relatively short central groove and relatively wide marginal ridges
True
Perm. Man. first premolar: the lingual cusp –> 3 things to remember from a lingual view
- Lingual cusp has consistent cingulum qualities to the anatomy
- Lingual cusp tip is approximately two-third’s the height of the facial cusp tip
- A pointed and centered lingual cusp tip is evident
Perm. Man. First premolar: Is the central groove positioned on the facial or lingual portion of the crown?
Lingual
T or f, A distinct mesiolingual groove is present that is located at the mesiolingual line angle and is continous with the mesiolingual coronal depression
False, it is not continuous
