DEH 103: Dental Anatomy
Chapter 5: Morphology of Permanent Molars
Chapter 5: Morphology of Permanent Molars
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| Sprache | Français |
| Kategorie | Medizin |
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| Erstellt / Aktualisiert | 30.12.2013 / 12.07.2014 |
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Molars are called _____ teeth becasue they do not replace a primary tooth.
Non-succedaneous teeth
What are the functions of molars?
- Mastication (grinding)
- Maintenance of vertical dimension of the face
- Support the cheeks (esthetics)
FYI: they are the largest and strongest teeth
How many lobes does a molar develop from?
3-5 lobes each cusp is a seperate lobe
The maxillary 1st molar is the _____ tooth in the arch.
Largest
There are _____ well developed cusps and a supplementery cusp known as _____ which is present _____% of the time.
- 4 well developed cusps
- Cusp of Carabelli (supplemental)
- Present 70% of the time
What is the height of the cusps from largest to smallest on a maxillary 1st molar?
ML --> MB --> DB --> DL
Maxillary 1st and 2nd molars have _____ roots which are ___.
- 3 roots
- MB, DB, and L
The furcation of a maxillary 1st molar is approximately _____ mm from the CEJ.
4 mm
What is the order of the root lengths of a maxillary 1st molar?
L --> MB --> DB
True/False:
The MB root of a maxillary 1st molar will not hide the DB root when viewed form the mesial.
False: it will hide the DB root b/c it is bigger
The furcation of maxillary 1st molars on the distal is approximately ____ mm frm the CEJ
5 mm
How many grooves does a maxillary 1st premolar have?
3-4 cusps
- Central
- Buccal
- Distal oblique
- Lingual
- Transverse (this is not always present b/c crosses over the obliqu ridge to join fossa in the cusp of Carabellei)
What are the 4 fossae on a maxillary 1st molar?
- Central (largest)
- Distal oblique
- Mesial triangular
- Distal triangular (minute)
This is projections of enamel that can be found on ridges.
Tubercles
When does the primary and permanent; maxillary and mandibular 1st molars erupt?
- Mandibular primary: 12 months
- Maxillary primary: 14 months
- Mandibular permanent: 6-7 years
- Maxillary permanent: 6-7 years
What is the time of eruption for primary and permanent; maxillary and mandibular 2nd molars?
- Mandibular primary: 20 months
- Maxillary primary: 24 months
- Mandibular permanent: 11-13 years
- Maxillary permanent: 12-13 years
What is the cusp height from largest to smallest of the maxillary 2nd molar?
ML --> MB --> DB --> DL
What are the 2 major gooves on the maxillary 2nd molar?
- Buccal
- Central
There is no oblique, lingual, or transverse groove b/c there is no DL cusp
What are the 3 major fossa on the maxillary 2nd molar?
- Mesial
- Distal
- Central
The mandibular (1st / 2nd / 3rd) molar is the largest in its arch.
Mandibular 1st
A mandibular 1st molar has _____ major cusps and ____ roots.
- 4 major cusps
- 2 roots (Mesial and Distal)
What is the cusp height from largest to smallest of a mandibular 1st molar?
ML --> DL --> MB --> DB --> D
- The furcation on the buccal view of a mandibular 1st molar is approximately _____ mm from the CEJ.
- The furcation on the lingual view of a mandibular 1st molar is approximately ____ mm from the CEJ.
- 3 mm
- 4 mm
What are the 3 major fossae of a mandibular 1st molar?
- Central
- Mesial triangular
- Distal triangular
What is the cusp height of a mandibular 2nd molar from largest to smallest?
ML --> DL --> MB --> DB
True/False:
The 3rd molars do not vary much from the 1st and 2nds.
False: They vary more than any other tooth in size and shape.
A piece of tissue that covers a partially erupted 3rd molar.
Operculum
When the operculum is traumatized or infected.
Pericornitits
What is the time of eruption of maxillary and mandibular 3rd molars?
- Mandibular: 17-21 years
- Maxillary: 17-21 years
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