Lower Primary anterior teeth from CI to Canine


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Lower Primary anterior teeth from CI to Canine

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  • 2. Whereas in permanent mandibular canines, mesial cusp slope is shorter that distal cusp slope.
  • Discernible- distinguishable
  • Lower Primary anterior teeth from CI to Canine

    2. 2. GENERAL CHARACTERISTICS OF PRIMARY ANTERIOR TEETH<br />Smaller in size than the analogous secondary teeth<br />Whiter in color<br />Crowns and roots of primary teeth have a marked constriction at the cervix<br />Labial cervical ridges more prominent than in permanent teeth<br />No mamelons on the incisal edges upon eruption<br />Roots are longer and narrower MD<br />
    3. 3. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />LABIAL<br />Flat surface with no developmental grooves<br />Mesial and distal sides of the crown are tapered evenly from the contact areas towards the cervix<br />Compared to permanent mandibular CI:<br />MD measurement is smaller<br />Lali measurement same<br />
    4. 4. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />LABIAL<br />Crown is wide in proportion to its length<br />Resembles the permanent maxillary lateral incisor<br />Root is long and tapers evenly to the apex<br />Root is pointed and almost twice the length of the crown<br />
    5. 5. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />LINGUAL<br />Middle and incisal thirds may have a flattened surface level with the marginal ridges or may have a lingual fossa<br />Has prominent cingulum slight lingual fossa and faint marginal ridges<br />Crown and root converge lingually<br />
    6. 6. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />LINGUAL<br />Tooth is narrower lingually<br />Crown and root converge lingually<br />Tooth is narrower lingually<br />
    7. 7. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />MESIAL<br />Cervial line more curved than in distal aspect<br />Incsal ridge centered on the root axis line<br />Convexity of the cervical contours labially and lingually at the cervical third is pronounced<br />Shows a prominent labial cervical ridge<br />
    8. 8. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />MESIAL<br />Crowns are wide Lali due to large cingulum<br />Lali measurement is only about a millimiter less than that of the primary maxillary central incisor<br />Root is nearly flat and evenly tapered<br />Root apex more blunt compared to labial and lingual aspects<br />
    9. 9. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />DISTAL<br />Cervical line of the crown is less curved<br />Developmental depression frequently evident on the distal side of root<br />
    10. 10. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />INCISAL<br />Incisal ridge is straight and bisects the crown Lali<br />Labial surface presents a flat surface slightly convex<br />Lingual surface presents a flat surface slightly concave<br />
    11. 11. MANDIBULAR TEMPORARY CENTRAL INCISOR<br />INCISAL<br />Has essentially equal MD and Lali dimensions with temporary mandibular lateral incisor<br />Crown tapers towards the cingulum on the lingual side<br />
    12. 12.
    13. 13. Temporary Mandibular Canines<br />
    14. 14. Temporary Mandibular Canines<br />Labial Aspect<br />Crowns are longer inciso-cervically than wide mesiodistally.<br />Sharp cusp tips like an arrow.<br />Roots are more tapered and pointed.<br />Roots shorter than temporary maxillary canines.<br />Cervical third of proximal crown margins do not converge cervically.<br />
    15. 15. Temporary Mandibular Canines<br />Labial Aspect<br />No grooves on labial surface.<br />No style on incisal margins.<br />M & D heights of contour are much nearer the cervix.<br />Labial surface is convex in all directions.<br />Three lobes<br />Central lobe<br />Mesial lobe<br />Distal lobe<br />
    16. 16. Temporary Mandibular Canines<br />Lingual Aspect<br />Cingulum reduced in size and less prominent.<br />Cingulum occupies less than the cervical third of the height of crown.<br />Lingual ridges barely discernible.<br />Faint marginal ridges.<br />Single concavity or fossa.<br />Cingulum narrow in mesiodistal direction.<br />
    17. 17. Mesial and distal view<br /> Cervical ridges are prominent<br />cusp tip is most often located slightly lingual to the root axis line.<br />The cervical third of a primary canine is much thicker than incisor. <br />Cervical lines curve incisally more on the mesial side than on the distal side<br />The roots are bulky in the cervical and middle thirds, tapering mostly in the apical third where the apex is bent labially<br />
    18. 18. Temporary Mandibular Canines<br />Mesial<br />Labial Border <br />slightly concave<br />The border is divergent from the long axis of tooth and extends from the mesio-incisal angle to the cervical border<br />Above the cervical border,the curvature increases as it rounds into the cervial constriction<br />Lingual Border<br />convex and then moderately concave before it enters into the convex cingulum.<br />
    19. 19. Temporary Mandibular Canines<br />Mesial surface<br />Labial and lingual borders<br />are divergent inciso-cervically <br />
    20. 20. Temporary Mandibular Canines<br />Mesial Surface<br />Cervical Border<br />is evenly concave toward the root<br />Mesial surface of the crown<br />is convex in the incisal 2/3 <br />Can be flatten or even become concave toward the center of the surface above the cervical line<br />
    21. 21. Temporary Mandibular Canines<br />Distal surface<br />Cervical border<br />Evenly concave toward the root<br />Of the crown<br />More extensive than the mesial surface<br />Evenly convex<br />
    22. 22. Temporary Mandibular Canines<br />Distal surface<br />Labial border<br />Moderately concave<br />And becomes convex above the cervical constriction<br />Lingual border<br />Firstly convex at the short distance<br />Then concave and convex again<br />Influenced by the cingulum<br />
    23. 23. Temporary Mandibular Canines<br />Incisal<br />Crown outline: diamond- shaped<br />nearly symmetrical, except for the mesial position of the cusp tips<br />more bulky in the distal half<br />Crown is 0.4 mm wider MD than Lali<br />Cingulum centered or just distal to the center <br />Actual tooth<br />Cast<br />