Permanent Maxillary First Molars Anatomy

Where is the facial height of contour for all molars
The Cervical 1/3

Where is the lingual height of contour for all molars
The Middle 1/3

What are the functions of all molars
Mastication, maintenance of vertical dimension of face, maintenance of arch continuity for poper alignment, and support cheeks

What may result from trauma because of the close relations of roots the sinus walls in maxillary molars
Roots of molars may penetrate the middle and posterior parts of the maxillary sinus

Why is there a possible increased risk for caries on the lingual pit of maxillary molars
Due to both increased dental biofilm retention and the thinness of enamel forming walls of the pit

Are mandibular or maxillary molars the most common teeth to be involved in concresence
Maxillary molars

Define concresence
The union of the root structure of two or more teeth through the cementum only

When do maxillary first molars erupt
6 to 7 years

When is the root completed in maxillary first molars
9-10 years

Which tooth is the largest tooth in the maxillary arch
The maxillary first molars

Which maxillary molar has the least variation in form
The maxillary first molars

How many developmental lobes/cusps does the maxillary first molar have and what are they
5 MB, DB, ML, DL, and cusp of carabelli

Is the cusp of carabelli a functional cusp
No

Which is wider on the maxillary first molar, the buccal to lingual dimension or the mesial to distal dimension
The buccal to lingual dimension

Which is larger the buccal surface of the maxillary first molar or the adjacent premolar
The maxillary first molar

What is the general shape of the maxillary first molar from the buccal view
Trapezoidal with the longer parallel side toward the occlusal

What are key landmarks/features of the maxillary first molar able to be seen on the buccal view
Buccal developmental groove (divides the 2 cusps)
Two cusps, MB and DB
MB cusp is the wider of the two

Describe the mesial outline and distal outline of the maxillary first molar from the buccal
Mesial: straight
Distal: Convex

What are the mesial and distal contact points of the maxillary first molar
Mesial: junction of occlusal and middle thirds
Distal: Middle third

What cusp will the cusp of carabelli always be located off of
The mesiolingual cusp

How many roots does the maxillary first molar have and name them
Three, lingual, distobuccal, and mesiobuccal

Which is the longest and which is the shortest root of maxillary first molars
Lingual is the longest and distobuccal is the shortest

How many furcations does the maxillary first molar have and what are they
3, buccal, mesial, and distal

Can all three roots of the maxillary first molar be seen from the buccal and lingual aspects
Yes

What are the locations of the furcation crotch areas of the maxillary first molars
Buccal and distal furcations are 5mm from the CEJ
Mesial furcation is 3mm from the CEJ

Which is more rounded/convex; the buccal or lingual surface of the maxillary first molar
The lingual surface

Does the lingual root of the maxillary first molar usually have a longitudinal depression
Yes

What roots can you see from the mesial aspect on the maxillary first molar
You can only see the mesial and lingual (palatal) root

Which cusp is the largest/highest on any maxillary molar
The mesiolingual cusp

What is the shape of the maxillary first molar from the occlusal view
Rhomboidal
Acute angles: MB and DL
Obtuse angles: DB and ML
*To remember obtuse angles remember ear to nose

Put the cusps of the maxillary first molar in order from largest to smallest
ML then MB then DB then DL then cusp of carabelli

Put the cusps of the maxillary first molar in order from highest to lowest
ML then DB then MB then DL then cusp of carabelli

How many pits/fossa does the maxillary first molar have and name them
4: Central, distal, mesial triangular, and distal triangular

What are two features of the maxillary first molar that help distinguish left and right
ML cusp much larger than DL cusp
Distal marginal ridge lower than mesial marginal ridge

Are the roots more spread out of the first or second maxillary molars
Roots are more spread out on first maxillary molars

Is the buccal groove longer on the first or second max molar
Buccal groove is longer on the first molar

Are the roots more distally bent on first or second max molars
Roots with more distal bend on second maxillary molars

What are some key differences between maxillary first and second molars
First has cusp of carabelli, second molars do not
Second molars can only have 3 or 4 cusps
Crown of first molars are larger than second
Crown of first molars wider on lingual half and on second molars its smaller on lingual half
DL cusp is well formed on first molars and very small in second molars

Why may maxillary first molars have increased supragingival tooth deposits
Mainly due to position in oral cavity: opposite the duct openings of the parotid salivary glands on the inner cheek at the parotid papilla

Cingulum A bulge or prominence of enamel found on the cervical third of the lingual surface of an anterior tooth Cusp (a) a pronounced elevation on the occlusal surface of a tooth terminating in conical or rounded surface; (b) any …

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