DEH 103: Dental Anatomy
Chapters 9 & 10: Morphology of Premolars
Chapters 9 & 10: Morphology of Premolars
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Cartes-fiches
What is the function of premolars?
- 1st premolars assist with tearing food
- 2nd premolars assist with grinding food
How many lobes does a premolar develop from?
- 2 cusp premolars develop from 4 lobes
- 4 cusp premolars develop from 5 lobes
The crowns of the 1st premolars are longer than the 2nd. The roots of the 1st premolars are _____ than the 2nd.
Shorter
The MBCR of the maxillary 1st premolar is _____ than the DBCR. (This is the only premolar to have this trait)
Longer
The maxillar 1st premolar has a developmental groove on which surface that is known to collect calculus?
Mesial developmental groove
On the maxillary 1st premolar the CEJ has a greater curveture on which side?
Mesial > Distal
This is a ridge associated with each cusp.
Triangular ridge
This is the union of 2 triangular ridges.
Transverse ridge
Maxillary 2nd premolars have a DBCR that is _____ than the MBCR. (This is different than the 1st premolars)
Greater
The (maxillar / mandibular) (1st / 2nd) premolar is the smallest premolar?
Mandibular 1st
True/False:
Premolars are present in the primary and permanent dentition.
False: only permanent
What is the time of eruption for maxillary and mandibular; 1st and 2nd permanent premolars?
- Maxillary 1st: 10-11 years
- Maxillary 2nd: 10-12 years
- Mandibular 1st: 10-12 years
- Mandibular 2nd: 11-12 years
**Premolars violate the general trend of mandibular before maxillary. They are backwards.**
