Maxillary Permanent Lateral Incisors PDF

 Maxillary permanent lateral incisor Chronology Appearance of the dental organ 5 m.i.u First evidence of calcification 1 year Enamel completed 4-5 years Eruption 8-9 years Root completed 11 years Type and f...

 Maxillary permanent lateral incisor Chronology Appearance of the dental organ 5 m.i.u First evidence of calcification 1 year Enamel completed 4-5 years Eruption 8-9 years Root completed 11 years Type and function This tooth has the function of incising food as well as esthetic. No. of lobes It has four lobes (three mamelons and cingulum) Relation The lateral incisor make contact mesially with the central incisor and distally with the mesial surface of the canine. 3 2 2 3 No. of surfaces It has four surfaces and incisal aspect. Labial Lingual Mesial Distal No. of roots It has one root. Incisal  Labial aspect ☻Geometrical outline of the crown: Trapezoid -The short side cervically -The long side incisally ☻The outline: - Mesial outline is slightly convex The crest at junction of incisal and middle M thirds. D - Distal outline is more convex. - Incisal outline is more curved than the central incisor. - The cervical line is convex root-wards. -The mesio-incisal angle is rounded. - The disto-incisal angle is more rounded. ☻Surface anatomy: -The surface is more convex than the central incisor. -Cervical ridge located at cervical third. ☻The root: D M - It has a single root (longer than root of upper central incisor) - It tapers evenly to apical 1/3 , then curve distally with a pointed apex.  Lingual aspect - It has the same geometrical outline and outline as the labial surface. - The mesial and distal sides of the crown and root converge ligually ( the lingual M D surface is narrower than the labial surface). - This convergence to accommodate with the horse shoe shaped of the alveolar process. ☻Surface anatomy: The elevations: 1- The cingulum ( present at cervical 1/3). 2- Marginal ridges. - Mesial marginal ridge. - Distal marginal ridge. - Incisal ridge. The depressions: - The lingual fossa ( it lies between the previous elevations). - Notice the lingual pit. ☻All elevations and depression are more developed than the upper central incisor.  Mesial aspect ☻Geometrical outline of the crown: ☻Triangular in shape; the base cervically and the apex incisally. ☻The incisal ridge is on a line that bisects the centre of the root. ☻The outline: ☻The labial outline is convex at cervical 1/3 ( cervical ridge). -Then become slightly convex to the incisal ridge. ☻The lingual outline is convex at cervical 1/3 (cingulum). - Then concave at the lingual fossa. - Then slightly convex for the incisal ridge.  ☻The mesial cervical line is convex incisally. ☻Surface anatomy: ☻ The labio-lingual measurement is less than the central incisor by about 1mm. ☻The mesial surface is convex with the maximum convexity at the junction of the incisal and middle 1/3s ( the contact area) ☻The root: ☻The root appears longer than the central incisor ☻It is cone shape with blunt apex. It has developmental deppresion.  The distal aspect ☻Similar to the mesial aspect but differ in. - The cervical line curvature is less than mesial ( by 1 mm). -The contact area located at the middle 1/3 (more cervially). - It is smaller and more convex than the mesial.  Incisal aspect ☻It may resemble the central incisor or a small canine. ☻The labio-lingual dimension is greater in comparison to the central incisor. 1 ☻The cingulum is centered.  Malformations Of The Upper Permanent Lateral Incisor 3 1 Missing lateral Peg-shaped incisor. lateral incisor. ☻Pulp cavity ►Mesio-distal section - The pulp chamber is wide conforming the shape of the crown. - It does not have three sharp pulp horns. (only 2) - The root canal tapers towards the apex. ►Labio-lingual section - The pulp chamber - The root canal tapers gradually pointed incisally, then as it traverse the root ending in a follows the increase in constriction at the apex (the the crown dimention apical foramen). cervically. Identify the tooth, the aspects and tell FOUR differences between the lateral and central incisor. Answer A- Upper P. central incisor. B- Upper P.lateral incisor Lingual aspect 1- Size. 2- The elevations and depressions 3- The incisal angles. A B 4- The root.