Term
| what teeth approximate the midline? |
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Definition
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Term
| what teeth are second from the midline? |
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Definition
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Term
| what are the functions of incisors? |
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Definition
(1) cut food
(2) articulate speech
(3) support lips (esthetics)
(4) guide mandible during movement |
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Term
| when does the first evidence of calcification occur in the maxillary central incisors? |
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Definition
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Term
| when does the first evidence of calcification occur in the maxillary lateral incisors? |
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Definition
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Term
| when does the completion of enamel occur in the maxillary central incisors? |
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Definition
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Term
| when does the completion of enamel occur in the maxillary lateral incisors? |
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Definition
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Term
| when does eruption of the maxillary central incisors occur? |
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Definition
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Term
| when does eruption of the maxillary lateral incisors occur? |
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Definition
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Term
| when does the completion of roots occur in the maxillary central incisors? |
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Definition
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Term
| when does the completion of roots occur in the maxillary lateral incisors? |
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Definition
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Term
| what is the labial view of the maxillary central incisors? |
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Definition
(1) trapezoidal in shape in which the distal outline is more convex than the relatively straight mesial outline
(2) mesial contact is more incisal than distal contact area
(3) Mesio-incisal corner is sharper (closer to 90°) than
disto-incisal corner
(4) CEJ curves apically
(5) incisal edge is perpendicular to the long axis
(6) Relatively straight incisal edge M-D (sometimes slightly convex)
(7) facial surface is slightly convex M-D
(8) facial is convex I-Gi; greatest convexity is in the gingival third |
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Term
| where does the mesial and distal height of contour occur in the maxillary central incisor? |
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Definition
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Term
| newly erupted maxillary central incisors have... |
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Definition
(1) 3 mamelons
(2) 2 shallow vertical depressions that fade out at the middle third (mesiolabial developmental depression and distolabial developmental depression)
(3) an incisal ridge that wears and becomes flatter called the incisal edge |
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Term
| what are the numerous, minute horizontal ridges on the enamel of newly erupted permanent teeth? |
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Definition
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Term
| what are the depressions or grooves located between the perikymata elevations? |
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Definition
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Term
| what is the lingual view of the maxillary central incisors? |
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Definition
(1) trapezoidal
(2) lingual fossa
(3) cingulum
(4) M-D width of Li is more narrow than the facial M-D width (seen best from incisal view)
(5) mesial & distal outlines are more narrow at gingival area
(6) mesial & distal marginal ridges converge toward the cingulum
(7) Li fossa is bounded by 4 convexities
(8) Li fossa may have a “W” shape (or M shape) |
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Term
| the root on the maxillary central incisor is... |
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Definition
(1) one single root
(2) straight
(3) tapered
(4) conical
(5) rounded at the apex |
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Term
| what is the medial view of the maxillary central incisors? |
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Definition
(1) triangular
(2) Incisal edge is centered or
(3) slightly facial to center Fa-Li
(4) labial outline is convex
(5) incisal third to half of facial
(6) slopes to lingual
(7) lingual outline is “S” shaped
(8) CEJ curves to incisal
(9) contact area: incisal 1/3 and centered faciolingually |
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Term
| the distal view of the maxillary central incisor is similar to the mesial EXCEPT... |
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Definition
(1) incisogingivally, the crown is shorter and is smaller
labiolingually
(2) facial is more convex in both directions (I-Gi and M-D)
(3) more of the labial surface is visible when viewed from distal than when viewed from mesial
(4) cervical line (CEJ) has less convexity
(5) contact area: more cervical than on mesial (still in the incisal third) |
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Term
| what is the incisal view of the maxillary central incisors? |
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Definition
(1) triangular
(2) La and Li are both convex
(3) cingulum is slightly offset to distal
(4) on facial: more convexity on distal third than mesial third |
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Term
| what is the labial view of the maxillary lateral incisors? |
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Definition
(1) mesial margin: ht. of contour is in incisal third
(2) distal outline is more rounded than mesial outline
(3) labial surface: more convex; narrower M/D than the central incisor
(4) incisal corners are more rounded than on central incisor
(5) root is longer proportionately to the crown than central
incisor root and crown
(6) root curves to the distal
(7) lateral: the facial is somewhat rectangular
(8) central incisor is more square than the lateral |
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Term
| what is the lingual view of the maxillary lateral incisors? |
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Definition
(1) prominent cingulum
(2) prominent marginal ridges
(3) lingual fossa: deeper; more defined
(4) deep developmental groove which extends
apically along the root |
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Term
what is the deep developmental groove which extends
apically along the root? |
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Definition
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Term
| what is the distal view of the maxillary lateral incisors? |
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Definition
(1) wider labiolingually than in mesial view
(2) CEJ not as deeply curved (as mesial) |
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Term
| what is the incisal view of the maxillary lateral incisors? |
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Definition
(1) large cingulum proportionally
(2) labial is convex
(3) lingual is convex |
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Term
| how to distinguish right from left on maxillary incisors |
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Definition
both: the distal is more convex than the mesial
lateral: the root commonly curves to the distal |
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Term
| how to determine if a maxillary incisors is central or lateral |
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Definition
(1) the central incisors are relatively square
(2) the lateral incisors are relatively rectangular
(3) lateral: root is more slender & longer compared to its crown |
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Term
| what is the maxillary lateral incisor often confused with? and what is the difference between these two teeth? |
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Definition
| mandibular cuspid; one difference is how the crown relates to the root of these two teeth |
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