Permanent 2 nd Maxillary Molars

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1 Permanent 2 nd Maxillary Molars In comparison to the first max molar

2 First molars appears in the oral cavity at the age of 6 years old.. While 2 nd molar 3 rd molar

3 Max. 2 nd molar have long roots (sometimes longer than the first molar!) 1 st molar 2 nd molar

4 Max. right 1 st molar Max. right 2nd molar DB MB DB MB DL ML DL ML DB is smaller DL is smaller No fifth cusp

5 2 types of 2nd max. molar Similar to the 1 st molar rhomboidal, although lesser measurement lingually Similar to the 3 rd molar. DL cusp is poorly developed.. Result in heart-shaped form occlusally rhomboidal heart-shaped

6 Buccal aspect

7 Crown cervico-occlusally is 0.5 mm or so shorter than the first molar.. 1 st molar 2 nd molar

8 DB cusp is smaller D DB M D DB M 1 st molar 2 nd molar

9 DB cusp is smaller and allows part of the distal marginal ridge and part of the DL cusp to be seen D DB M D M 1 st molar 2 nd molar

10 Buccal roots about the same length, nearly parallel

11 Buccal roots inclined distally more than those of max. 1 st molar D M D M 1 st molar 2 nd molar

12 Apex of MB root is on a line with buccal groove of the crown instead of the tip of the MB cusp, as found on the first molar. D M D M 1 st molar 2 nd molar

13 Lingual aspect. Maxillary LEFT 2 nd molar

14 1 st molar 2 nd molar DL cusp is smaller than 1 st max. molar.

15 No fifth cusp is evident

16 1 st molar 2 nd molar Apex of the lingual root is in line with DL cusp tip instead of the lingual groove as was found on 1 st max molar

17 Mesial aspect. Maxillary LEFT 2 nd molar

18 1 st molar 2 nd molar BL dimensions similar to 1 st molar, but crown length is less

19 1 st molar 2 nd molar Roots close to each other, within the BL crown outline

20 Distal aspect. Maxillary LEFT 2 nd molar

21 DB cusp is smaller than 1 st molar, that s why more of the MB cusp may be seen from this angle 1 st molar 2 nd molar

22 Apex of the L root is in line with the DL cusp L Distal view of 2 nd molar

23 Rhomboidal type of second maxillary molar is most common, although in comparison to with 1 st molar, acute angles of the rhomboid are less and the obtuse angles greater

24 B-L diameter of the crown is about equal,

25 B-L diameter of the crown is about equal, but M-D diameter is about 1 mm less

26 DB and DL cusps are smaller than 1 st molar

27 More supplemental grooves and pits

28 Permanent 3 rd Maxillary Molars

29 Generally, 3 rd molars crowns are smaller and roots are shorter with inclination toward fusion.

30 BuccAL Aspect

31 Crown shorter cervico-occlusally than the 2nd molar.. 1 st molar 2 nd molar 3 rd molar

32 narrower M-D than the 2 nd molar

33 Roots are usually shorter and fused Roots inclined distally 1 st molar 2 nd molar 3 rd molar

34 Lingual aspect. Maxillary RIGHT 3 rd molar

35 Only one large lingual cups is present, so no lingual groove (Exceptionally, DL cusp present with the lingual groove) M DL D

36 Taper of the fused root M D

37 Main feature is the taper to fused roots or a bifurcation, usually in the apical third of the root Mesial aspect. Maxillary RIGHT 3 rd molar

38 Distal aspect. Maxillary RIGHT 3 rd molar

39 There is tendency of the crown to taper distally.. L B Most of the buccal aspect of the crown is in view

40 L B Measurement from cervical line to marginal ridge is short

41 2 nd molar 3 rd molar L B L B More of the occlusal surafce may be seen than can be seen on the second molar from this aspect..

42 Occlusal aspect. Maxillary RIGHT 3 rd molar

43 Three functional cusps, 2 Buccal 1 lingual Heart-shaped

44 B D M L DL cusp is very small, and may be absent, which gives a semicircular outline to the tooth from one contact area to the other

45 B D M L Many supplemental grooves

46 3 rd molars (maxillary & mandibular ) shows variations more than any other teeth in the mouth..

47 3 rd max. molars Ten typical samples

48 Extreme Variations!!!

49

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