Lecture 6 Mand. Premolars

Where are the mand. 1st premolars located?

posterior to canines

Give the amount of lobe development in mand 1st.

4

Which cusp is dominant and which is smaller in mand. 1st premolars?

buccal, lingual

Which cusp is considered non functional in mand. 1st premolars?

lingual

Define centric occlusion.

Define intercuspation.

relationship of arches occlusal surfaces when jaw is closed

Define intercuspation.

relationship of cusps from jaw to opposite jaw

When the jaw is closed the teeth are in maximum _______.

intercuspation

Mand. 1st premolars act similar to:

canines

What is the contact area of the mesial and distal on 1st premolars?

middle

Which lobe is more prominent in max 1st premolar?

buccal

Which cusp ridge is shorter in mand. 1st premolar?

mesial

Compared to a canine, the buccal cusp is more ______. (mand. 1st)

rounded

What tooth is the facial aspect of the mand. 1st premolar similar to?

canine

From the lingual aspect, the crown and root slope ______.

lingually

Because the lingual cusp is so small what anatomical feature of the buccal cusp can you see from this view?

lingual cusp ridge

What is located on each side of the lingual cusp ridge?

occlusal pits

What is an identifying characteristic on the MAND. 1st premolar?

mesiolingual developmental groove

Give the buccal height of contour for MAND 1st premolar.

cervical

Give the lingual height of contour for MAND 1st premolar.

middle

What 3 structures can you see from the mesial aspect? mand. 1st premolar

mesilingual groove, mesiobuccal and lingual lobes

What is a key distinction of the distal aspect of the mand. 1st premolar?

distal marginal ridge more developed than mesial

Within the mesial and distal fossa of mand. 1st premolar there are….

mesial and distal pits

The occlusal aspect of mand. 1st premolar is _____ shaped, coverging toward the _____ side.

triangular, lingual

What 3 structures are present on the occlusal surface of mand. 1st premolar?

lingual triangular ridge, mesial/distal pits, mesiolingual developmental groove

Which tooth does not usually have a central groove? (test)

mand. 1st premolar

What is this structure? (test)

uninterrupted transverse ridge

These are the:

distal and mesial fossa

How does the transverse ridge of mand. 1st premolar cross?

buccolingually

How many root(s) does mand 1st premoalr have?

1

How many pulp horn(s) does mand 1st premoalr have?

2, buccal

How many cusps can mand. 2nd premolar have?

2/3

Which mandibular premolar is larger?

second

Which cusp of the 2nd. mand premolar is more developed?

lingual

Give the buccal height of contour for MAND 2nd premolar.

cervical

Give the lingual height of contour for MAND 2nd premolar.

middle

Which mand. premolar has higher marginal ridges?

second

The mand. 2nd premolar functions a lot like a _____.

molar

What does having higher marginal ridges provide?

better occlusion

When referring to the 3 cusp type, the 2 lingual cusps developem from ______ lobes and have _ lingual pulp horns.

separate, 2

Give contact areas for 2nd mand. premolar

middle

The facial aspect of 2nd. premolar is _____.

smooth

Are lingual lobes more developed on 1st or 2nd premolars?

second

How are the mesiolingual and distolingual cusp divided in 2nd. mand premolar?

lingual groove

Is the mesiolingual or distolingual cusp larger? (mand 2nd)

mesiolingual

In the 2 cusp form a ____ lingual cusp develops ____ a lingual groove.

high, without

Give the size order from largest to smallest for the 3 cusp form.

buccal mesiolingual distolingual

The occlusal surface of 3 cusp form has 3 deep developmental grooves:

mesial distal lingual

What are the 3 pits that can be present?

mesial distal central

Which pit is most likely to be present?

central

For the occlusal surface give the 2 types of fossa. (mand 2nd_

distal triangular, mesial

know this

know this

Which cusp form has a rounder occlusal table?

2

There is no _____ ridge present on the 3 cusp form.

transverse

What groove is not present on the 2 cusp form?

lingual development

Which pit is not present on the 2 cusp form?

central

Give the 3 types of occlusal groove patterns.

Y3 H2 U2

Which occlusal groove pattern is most common?

Y3

Which occlusal groove pattern is least common?

U2

Of the 2 cusp variety which pattern is more common?

H2

This is:

U

This is:

H

This is:

Y

Which premolar has a larger root?

2nd

The apex of mand. 2nd curves towards the…

distal

There are _ pulp horns on the 2 cusp type and _ pulp horns on the 3 cusp type.

2, 3

Pulp horns are more pointed on the ____ mandibular premolar.

2nd