Molars  Groups Of Teeth That Are Positioned At The

MOLARS  Groups of teeth that are positioned at the most posterior portion of each quadrant

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Accessional Teeth because they do not have any teeth erupting before them

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1st Molars o 7

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a.k.a. 6 year old molars guide post of the arches

2nd Molars

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are the first to erupt at the age of 6-

a.k.a. 12 year old molars

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3rd Molars

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a.k.a. Wisdom tooth erupts at the age of 17-21 good for pulverizing the food we take in before swallowing has big occlusal surfaces that are MULTI-CUSPED FUNCTIONS: o Good root support (has more than 1 root) o Good positional relationship with TMJ (Temporomandibular Joint) o Good muscle support o Maintains the vertical relations of Maxillary & Mandibular bones o Maintains the continuity of the dental arches

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2.

th

3 major cusps (DBC, MBC, MLC) & a 4 cusp of a lesser size (DLC) 3. Crowns are broader Bu-Li than M-D 4. DB & ML cusps are connected by an Oblique Ridge

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MB, DB, ML cusps are arranged in a TRICUSPATE pattern (triangular pattern) 6. 2 Bu cusps are unequal in size, MBC us bigger than DBC 7. DLC is a minor elevation: may be greatly reduced or missing entirely

B

u & Li profiles converge occlusally

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CLASS TRAITS 1. largest occlusal surface 2. 3-5 major cusps 3. at least 2 Bu cusps 4. 2 or 3 large roots ARCH TRAITS OF MAXILLARY MOLARS 1. 3 ROOTS: 2 Bu & 1 Li/ PALATAL ROOT

4. MCA – junction of O3rd & M3rd 5. DCA – M3rd 6. cervical line will be convex towards the root 7. cusp tips seen: MBCT, DBCT, MLCT 8. MBC & DBC almost on the same level: MBC is longer than DBC but DBC has sharper tip 9. 3 roots seen in Bu view – widely spread apart 10. MBR is narrow MD LINGUAL SURFACE 1. OG is Convex 2. Apex of LR is in line with DLG 3. cusp of Carabelli 4. Bu cusp not visible in Li surface MESIAL SURFACE

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gr eatest width at Cervical portion & smallest width at Occlusal portion 3. M LC more convex 4. Pr ominent MMR with tubercles & supplementary grooves (more occlusally positioned) 5. bo th MBR & LR project beyond adjacent crown profiles 6. M BR is wide Bu-Li 7. Lo ngitudinal Root Depression on MBR (because of 2 pulp canals) LINGUAL SURFACE (ROOT) 1. wi de M-D & narrow Bu-Li 2. B ANANA-SHAPED

* Apex of MB Root of MAX 1st MOLAR is said to be in line with the MBCT * Apex of MB Roost of MAX 2nd MOLAR is said to be in line with the Bu Groove * OCO of MAX 1st MOLAR is said to be SQUARE to RHOMBOIDAL

ARCH TRAITS OF MANDIBULAR MOLARS 1. 2 ROOTS: 1M & 1D

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4 major cusps (MBC, DBC, MLC, DLC) & a 5th cusp of a lesser size 3. Crown is wider M-D than Bu-Li 4. 2 Li cusps of approximately equal sizes 5. MBC & DBC are approximately equal in size TYPE TRAITS OF MAXILLARY 1ST MOLAR  BUCCAL SURFACE 1. OG shorter than in all maxillary teeth 2. well defined MO angle 3. rounded DO angle

-Rosette Go 082508 