Maxillay first molar

Maxillary first permanent molar

1. Maxillary molars Menatalla M Elhindawy

2. Welcome back To dental school

3. Maxillary 1 st molar

4. Where is it?

5. Is it a successor??

6. Maxillary 1 st molar Chronology Tooth aspects Buccal Palatal Mesial Distal Occlusal In Our Life “ clinical consideration” Variations & Anomalies

7. In our life Maxillary Sinus Approximation Relation between the floor of the Max sinus and the roots of the 1 st maxillary molar is classified as follow: Type 0 : roots are not in contact with the sinus. Type 1: the roots are in contact with the sinus. Type 2: the roots encompass “enclose” the sinus. Type 3: the roots are into the sinus

8. In our life The antiro -posterior relation between the maxillary 1 st and mandibular 1 st molars determines the proper occlusion relation Class I… MB cusp pf max. 1 st occludes in MB groove of the mand . 1 st “ proper relation” Class II… the max. 1 st molar is in anterior relation to the mand . 1 st molar “ protrusion” Class III.. The max. 1 st molar is in posterior relation to the mand 1 st molar “ retrusion ”

9. Maxillary 1 st molar Chronology First evidence of calcification.. At birth Crown completed.. 3-4 y Eruption.. 6-7 y Root completion.. 9-10 y

10. In our life Eruption of the maxillary 1 st molar without being replaced by deciduous tooth and without the parents awareness increase its chances to be affected by caries and ignored by the parents

11. Maxillary 1 st molar Buccal Aspect Geometric out line Trapezoid The mesial outline Straight Slightly convex The distal outline Convex Cusps All cusps can be seen Occlusal outline…. MB and DB cusps MB cusp ; the widest , with obtuse angled slopes and longer . DB cusp ; narrower , pointed with right angled slopes .

12. Contact areas Mesially : at the junction between middle and occlusal 1/3s Distally: at the middle of the middle 1/3 Surface description The buccal surface is more convex , slightly concave/flattened then convex again Buccal developmental groove ends in the buccal pit . Cervical line Irregular and slightly convex root wise. More convex Concave to flattened Convex Maxillary 1 st molar Buccal Aspect

13. Maxillary 1 st molar Buccal Aspect The roots The 3 roots . The MB root inclines distally while the DB root inclines mesially . The root trunk has a length of about 4 mm from the cervical line to the furcation area. A deep developmental groove .

14. Maxillary 1 st molar Palatal Aspect Mesial outline Straight Distal outline Semicircular Lingual convergence NO lingual convergence Cusps only palatal cusps… MP and DP MP cusp ; largest . DP cusp ; is s mall , s mooth and s pheroid The fifth cusp

15. Maxillary 1 st molar Palatal Aspect Cervical line Nearly straight Surface description The lingual development groove . Carabilli’s cusp or the fifth cusp “ tubercle ” is hanged over the MP cusp . The roots The 3 roots are seen. large palatal root which is conical and terminates in a blunt apex Developmental depression on the root surface

16. In our life According to the anatomy of the maxillary 1 st molar, the extraction forceps were designed with a small projection to engage the buccal developmental groove on the root trunk And so, there is right extraction forceps and left extraction forceps of the maxillary molars

17. Maxillary 1 st molar Mesial Aspect Geometric out line Trapezoid Buccal outline Convex at the cervical 1\3 and become flat Crest of curvature Junction between middle and cervical thirds Palatal outline convex Crest of curvature middle of the middle 1/3

18. Maxillary 1 st molar Mesial Aspect Cusps MB , MP and 5 th cusp The cusp tips are within the confines of the root trunk . The MB cusp tip is on line with the buccal outline of the mesiobuccal root . The MP cusp tip is on line with the long axis of the palatal root . Cervical line slightly concave root wise

19. Maxillary 1 st molar Mesial Aspect Surface description The mesial contact area more buccally . There is a concavity cervical to the contact area which may extend onto the cervical portion of root trunk . The roots only 2 roots are seen. MB root is broad and flat . Palatal root is longer but narrower . It is banana shaped. 2\3s Blunt Pointed

20. Maxillary 1 st molar Distal Aspect The is Distal Convergence Surface description The distal contact area is at the center of the crown. Concave area near the cervical line . The distal marginal ridge is shorter and at a lower level All 4 major cusps can be seen as the distal cusps shorter All roots can be seen as; the distobuccal root is narrower .

21. In our life Depending on the root divergence and the amount of alveolar bone in between the 3 roots of the maxillary 1 st molar It is used to anchor the orthodontic tooeth movements.

22. Maxillary 1 st molar Occlusal Aspect Geometric outline Rhomboidal The buccolingual dimension is greater than the mesiodistal dimension. The crown tapers distally . There is NO lingual convergence Elevations The 4 major cusps. Oblique ridge . Marginal ridges , strong and well developed; the distal marginal ridge is shorter and at a lower level . MP DB MB DP

23. Maxillary 1 st molar Occlusal Aspect Depressions Developmental grooves; buccal , central , transvers groove of the oblique ridge , distal oblique and fifth cusp groove. Supplementary grooves. Major fossae; central fossa , Distal fossa. Minor fossae; mesial and distal triangular fossae.

24. The primary cups are MP, MB & DB The DP cusp is called secondary cusp as it becomes smaller and may disappears on the second and the third molars. Maxillary 1 st molar Occlusal Aspect

25. Maxillary 1 st molar Variations & Anomalies

26. Maxillary 1 st molar Variations & Anomalies Mulberry Molar Physically defective (dwarfed) molar characterized by multiple rounded rudimentary globular enamel growths These teeth are functional but can be cosmetically fixed with crowns, bridges, or implants.

27. Thank You