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60 Cards in this Set
- Front
- Back
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Where are central incisors located?
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closest to the midline
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Where are the lateral incistors located?
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second tooth from the midline
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What are the three major functions of incisors?
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Mastication, esthetics, and Phonetics
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What is the incisal edge?
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flattened edge or surface
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What are mamelons?
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rounded extentsions of enamel on th incisal edge or recently erupted incisors
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Where are the marginal ridges of incisors found?
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On the mesial and distal terminations of the lingual surface
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True or Fals: The linguogingival groove is commonly found in the maxillary lateral incisors than the central incisors.
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True pg.48
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True or False: The Lingual pit is a potential site for caries.
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True
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The linguogingival fissure is a groove that originates in the ________, and extends cervically, and slightly _________ onto the cingulum.
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Lingual pit, distally
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What direction does the lingugingival fissure run in?
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A vertical direction
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Which third of the maxillary lateral incisor is the height of conteur located?
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Cervical third
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True or false: From a mesial aspect, the cervical line of the maxillary lateral incisors exhibits more depth of curvature than it does on the mesial of the central incisor.
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Fales. It exhibits less depth of curvature.
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On the maxillary lateral incisor, which side is bigger the mesial or distal, and which has the longer (incisally placed) contact area?
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The mesial
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From the incisal view, what feature is different on the lateral from the central maxillary incisors?
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The cingulum is often more prominent.
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What geometric shape does the outline of the incisal view of the maxillary lateral incisor exhibit?
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It has a rhomboidal appearance
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Looking at the incisors labiolingually which exhibits more convexity, the centrals or laterals?
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The laterals
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Describe the distal outline of a max central incisor as compared to its mesial outline.
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The distal outline is convex but more rounded than the mesial. It also has a more rounded distoincisal angle.
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Where is the crest of curvature on the distal proximal surface of a max central incisor?
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at the contact area near the junction of the middle and incisal thirds
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Where is the contact area on the distal proximal surface of a max central incisor?
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near the junction of the middle and incisal thirds
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Is the distal contact area more gingivally or incisally located than the mesial?
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more gingivally
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What is a unique characteristic that the incisal edge of a max central incisor may possess?
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Mamelons
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What are developmental depressions?
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Developmental depressions are shallow depressions located on the facial surface of max incisors. They extend from the incisal edge toward the gingiva and disappear near the middle third. They represent the division of the 3 labial lobes of the tooth.
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What are the names of these developmental depressions?
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mesiolabial and distolabial
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What are imbrication lines?
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Imbrication lines may or may not be found in the cervical third of max central incisors. They parallel the CEJ.
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Where is the height of contour on the facial surface of max central incisors?
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in the cervical third
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Describe the lingual aspect of a max central incisor.
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-roughly trapezoidal
-narrower mesiodistally than the labial surface -has a lingual fossa that comprises the incisal half to 2/3 of the surface -also possesses a cingulum |
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Describe the cervical margin of the lingual surface of a max central incisor.
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It is asymmetrical with its area of max. curvature offset distally.
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The permanent incisors on which arch are larger?
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Maxillary- particularly in the mesiodisal dimension
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What are the names and numbers of the permanent maxillary central incisors?
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Maxillary Right Central Incisor (8)
Maxillary Left Central Incisor (9) |
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What is the crown shape of the maxillary central incisor from:
labial or lingual aspect proximal aspect |
Trapeziodal
Triangular |
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What are the primary functions of the central incisors?
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mastication: biting, cutting incising and shearing
esthetics and phonetics |
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Maxillary Central Incisors developmental table:
Initiation of calcification- Completion of enamel - Eruption - Completion of root - |
3-4 months
4-5 years 7-8 years 10 years |
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The crown of the central incisor is longer
a.) mesiodistally b.) incisocervically |
The crown of a maxillary central incisor is longer incisocervically
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The labial surface of the central maxillary incisor is concave or convex?
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Labial crown of 8 & 9 are convex both mesiodistally and incisogingivally
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In which third will you find the mesial contact of a maxillary central incisor?
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The incisal third
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What is the lingual fossa of the maxillary central incisor?
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shallow concavity found in the incisal half to two-thirds of the crown, which includes the largest area of the lingual surface.
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What on the maxillary central incisor is bounded by four convexities; on the mesial and distal by the mesial and distal marginal ridges, on the incisal by the incisal edge, and on the cervical by the cingulum
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Lingual fossa
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What is the bulky convexity located in the cervical portion of the lingual surface of the maxillary central incisor?
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Cingulum
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On maxillary central incisors sometimes there is a groove that separates the cingulum and the lingual fossa. What is it called?
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linguogingival groove
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What is the pit called that is located between the cingulum and fossa near the center of the linguogingival groove on the maxillary incisors?
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lingual pit
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What two structures (lingually) are found more commonly on the maxillary lateral incisors than on the maxillary centrals
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linguogingival groove & lingual pit...neither structure is usually found on the crown of any permanent incisor.
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What marks the mesial and distal borders of the lingual fossa as well as the lingual surface of the maxillary central incisors?
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marginal ridge
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What are linear, and extend from their respective incisal angles to the cingulum and named by location (mesial & distal)?
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Marginal ridges
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Where is the height of contour of the maxillary central incisor?
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lingual rest of curvature is located in the cervical third, at the greatest convexity of the cingulum.
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Which aspect is the central incisor crown is roughly triangular in shape, and the incisal edge, at the apex of the triangle, lies over the long axis of the tooth. The mesial surface is generally convex in both dimensions, incisocervically & labiolingually.
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Mesial aspect
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What is the labial outline of the maxillary central incisor?
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It is convex, with the height of contour and greatest convexity located in the gingival third. Some specimens may exhibit a flat outline incisal to the crest of curvature.
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What is the lingual outline of the maxillary central incisor?
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It is somewhat concave in the incisal portion and convex in the gingival portion. The entire outline is a shallow "S".
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Where is the crest of curvature of the lingual outline of the maxillary central incisors
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it is found in the cervical third at the prominence of the cingulum.
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What CEJ curves evenly toward the incisal and exhibits the gratest depth of curvature of any tooth surface in the mouth?
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Cervical margin of the maxillary central incisor
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What on the maxillary central incisor is usually pointed, or slightly rounded when newly erupted and straight, but slopes from labial to lingual over time?
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Incisal outline of the maxillary central incisors.
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T/F: The mandibular central incisor erupts at 5-6 years of age.
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False. It is 6-7 years of age.
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T/F: The mesioincisal angle of the mandibular central incisor is typically sharper than the incisal angles of maxillary incisors.
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True
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T/F: The distal outline's heigh of contour is found in the middle third.
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False. The incisal third.
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T/F: The surface outline of the mandibular central incisor is roughly triangular.
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False. It is trapezoidal.
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T/F: Developmental depressions and imbrication lines are not normally present on the mandibular cental incisor.
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True.
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T/F: The labial surface height of contour is in the cervical third.
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True.
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T/F: The CEJ curves evently toward the root, and is located at the same distance from the incisal edge as it is on the labial surface.
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False. It is located farther from the incisal edge than it is on the labial surface.
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T/F: A cingulum is normally present and is usually more prominent than the maxillary incisor cingulum.
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False. It is not so prominent as in the maxillary incisors.
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T/F: The height of contour on the lingual face is in the cervical third, at the greatest convexity of the cingulum.
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True
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T/F: The mandibular central incisor usually completes its root at 9 years.
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True
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