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2permanent incisors

QuestionAnswer
mesiodistal dimension of the crown is larger than the labiolingual dimension maxillary central and lateral incisors
incisal ridge exhibits a distolingual twist maxillary central incisors mandibular lateral incisor
root is very narrow mesiodistally with mesial and distal root depressions mandibular central and lateral incisor
incisal edge is positioned more to the lingual of the root axis line mandibular central and lateral incisor
distal proximal height of contour is more cervical than the mesial height of contour maxillary central and lateral incisor mandibular lateral incisor
tooth has the widest (mesiodistally) incisor crown maxillary central incisor
tooth has the shortes root relative to its crown maxillary central incisor
tooth has the largest curvature of the mesial cervical line maxillary central incisor
tooth has the narrowest incisor crown (mesioditally) mandibular central incisor
maxillary and mandibular incisors have 4 lobes and cingulum
Functions of Incisors Cut food Articulate speech Support lips (esthetics) Guide mandible during movement
crown is the longest incisor crown maxillary incisor crown
General Similarities of Most Incisors from the Facial View Relatively straight incisal edge Rectangular shape: longer incisocervically than mesiodistally Taper narrower from contact to cementoenamel junction (CEJ) CEJ curves toward apex
Characteristics of All Incisors EXCEPT Mandibular Centrals from the Facial View [cont.] Distal crown surface is more convex than mesial Mesioincisal corner is sharper than distoincisal Distal contact is located more cervically than on mesial Incisal edges slope cervically to distal
Characteristics of All Incisors from the Lingual View Lingual surface narrower (seen best incisally) Marginal ridges converge toward cingulum
Characteristics of All Incisors from the Proximal Views Wedge-shaped (triangular) outline Bulge greatest in cervical third facially and lingually (cingulum) Lingual outline is “S” CEJ curves incisally Root tapers to apex When present, distal root depression is greater than mesial
Characteristics of All Incisors from the Incisal View Concave lingual fossa incisal to cingulum Incisal edge runs across between widest points on mesial and distal Labial outline is broader (less convex) than lingual
Crown Shape of Maxillary Incisors from the Labial View Maxillary central has wider, longer crown Maxillary lateral is relatively narrower mesiodistally Maxillary lateral is more often missing or peg shaped
Lingual Fossa of Maxillary Incisors from the Lingual View Maxillary laterals more likely to have deeper lingual fossae and pits than centrals
Cingulum of Maxillary Incisors from the Lingual View Maxillary central incisor cingulum is more developed and is off center toward the distal (best seen from incisal view); cingulum of lateral incisor is more centered
Marginal Ridges of Maxillary Incisors from the Lingual View Maxillary lateral incisor has the distal marginal ridge appear shorter than mesial (more so than on centrals) due to slope of incisal edge shorter toward distal, and distal placement of cingulum
are more likely to have deeper lingual pits than centrals maxillary incisals
root shape maxillary incisors All incisor roots have lingual surfaces that are convex Roots taper narrower toward the lingual
Incisal Edge of Maxillary Incisors from the Proximal Views Maxillary centrals (from distal view) may have distoincisal corner showing due to distolingual twist of incisal edge (shows better on incisal view)
incisal crown shapes are rectanguluar, longer incisogingivally than mesiodistally from the facial
incisal crown from the facial taper from the contact areas to cervical lines
incisor crown outline on the distal are convex than on mesial (except on the mandibular central incisors)
mandibular central incisors are known for symmetry
mesial angles are more square than distoincisal angels which are obtuse except mandibular central incisors
mesial contact arears are in the incisal third
distal contact arears are more cervical than the mesial
Created by: bisonlea
 

 



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