Molars Flashcards
What molars have 5 cusps?
Maxillary and Mandibular 1st Molar
How many cusps do max. and mand. 2nd molars have?
4 cusps
Which molars are Trifurcated?
Maxillary molars
Which molars are Bifurcated?
Mandibular molars
What are unique to Maxillary Molars?
Oblique Ridge: runs from the triangular ridge of DB cusp to the Distal cusp ridge of ML cusp
- is trifurcated: has 1 palatal root that is long & strong
- from occlusal, they are wider buccolingually than mesiodistally (opp. of mandibular molars)
What are the Mesial and Distal contacts of Molars (max and mand.)?
Middle third or junction of occlusal and middle third
What is the Heights of Contour for molars (max. and mand.)?
Buccal: Cervical third
Lingual: Middle third
What molars erupt at 6 years?
Mandibular and Maxillary 1st molars; mandibular usually before maxillary
What is the largest tooth (overall) in the maxillary arch?
Maxillary 1st molar (#3 & #14, Palmer 6)
Two triangular ridges that cross the occlusal surface, from ML cusp tip to DB cusp tip forms what on Maxillary 1st and 2nd molars?
The Oblique Ridge
Which teeth are Rhomboidal in shape from the occlusal view?
Max. 1st & 2nd Molar
What doe the Maxillary 1st molar look like from the Buccal view?
Trapezoidal in shape (longer parallel side toward occlusal)
Where is the Cusp of Carabelli located?
on lingual surface of ML cusp
How many pulp canals do Maxillary Molars have?
3-4 (4 if there are 2 canals in one root-usually the MB root)
What are the 2 variations of the maxillary 2nd molar of the occlusal view?
- Rhomboidal (most common)
- Heart shaped- DL cusp is very small
What molar is a 12 year molar?
Maxillary 2nd molar- erupts at 12 years
What features are present on the Max. 2nd molar as viewed from the occlusal?
cusp ridges, triangular ridges, transverse ridge, Oblique Ridge, groove and fossae are similar to max. 1st molar in both types of max 2nd molar
The Maxillary 2nd molar, from the Buccal view, is ________ occlusocervically and __________ M-D as compared to the max. 1st molar.
shorter occlusocervically and narrower (M-D) compared to max 1st molar
What are the 2 variations of the max. 3rd molar from the occlusal view?
Heart shaped and Rhomboidal
As you move posteriorly, the molars become ________, more _________, and roots become ________
smaller, more variable, and roots become less divergent
As viewed from the occlusal, mandibular molars are wider _________ than ___________.
wider mesiodistally than buccolingually
How do the crowns of mandibular teeth incline?
incline lingually
What is the largest tooth in the mandible?
Mandibular 1st molar
What is the 5th cusp on the mandibular 1st Molars?
Distal Cusp - smallest cusp
What is the shape of the Mandibular 1st molar as viewed from the occlusal?
Roughly Pentagonal
How many cusps are visible on the mand. 1st molar from the buccal view?
3 cusps: MB, DB, and Distal cusp (largest to smallest)
What separates the cusps on the buccal view of the mandibular 1st molar?
the MB and DB groove
What cusps are visible on the lingual view of the mand. 1st molar?
the ML cusp and DL cusp which are separated by the lingual groove
The mandibular 1st molar, from the Buccal view, is ___________ mesiodistally than occlusocervically.
Larger mesiodistally than occlusocervically
How many pulp canals do mandibular molars have?
Usually 3 (2-3) 1 in the Mesiodistal root and 2 in the mesiobuccal (MB) root
What is the shape of the Mandibular 2nd molar from the occlusal view?
more rectangular in shape
How many transverse ridges are present on the mandibular 2nd molar?
2 transverse ridges (made of triangular ridges: MB-ML and DB-DL)
What grooves are present on the Mandibular 2nd molar?
One buccal groove and one lingual groove which join on the occlusal surface as they intersect with Developmental groove- this groove pattern forms a cross
Which molars are the most variable and often impacted?
3rd Molars (wisdom teeth)
Roots are often dilacerated in what molars?
mandibular 3rd molars
Are molars succedaneous?
No they are non-succedaneous
