Podcast
Questions and Answers
How do posterior teeth differ from anterior teeth in terms of the occlusal surface?
How do posterior teeth differ from anterior teeth in terms of the occlusal surface?
- They have shorter crown cervicoooclusal
- They have a broader contact area
- They lack developmental grooves
- They have an incisal edge instead of an occlusal surface (correct)
Which statement is correct regarding the relative buccolingual measurement of posterior teeth?
Which statement is correct regarding the relative buccolingual measurement of posterior teeth?
- It varies based on the number of roots
- It is typically smaller than the mesiodistal measurement
- It is generally greater than the mesiodistal measurement (correct)
- It is equal to the mesiodistal measurement
What is a distinguishing feature of the cervical line of posterior teeth?
What is a distinguishing feature of the cervical line of posterior teeth?
- It is located near the incisal edge
- It is less curved mesially and distally (correct)
- It has well-defined developmental grooves
- It has a high degree of curvature
Where are the contact areas usually located in posterior teeth?
Where are the contact areas usually located in posterior teeth?
Which statement is true regarding the orientation of marginal ridges in maxillary premolars?
Which statement is true regarding the orientation of marginal ridges in maxillary premolars?
In terms of root morphology, what is a common feature of maxillary premolars?
In terms of root morphology, what is a common feature of maxillary premolars?
What distinguishes the upper first premolar from the upper canine in terms of contact areas?
What distinguishes the upper first premolar from the upper canine in terms of contact areas?
What defines the crown morphology of most maxillary premolars?
What defines the crown morphology of most maxillary premolars?
Which aspect differs between upper first premolars and canines regarding root morphology?
Which aspect differs between upper first premolars and canines regarding root morphology?
What characterizes the crown in terms of grooves for most maxillary premolars?
What characterizes the crown in terms of grooves for most maxillary premolars?
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Study Notes
Morphology of Upper First Premolar
- Crown is wider buccally than lingually
- Elevation features: buccal triangular ridge, lingual triangular ridge, mesial and distal marginal ridges, and depressions
Pulp Cavity and Root Canals
- Pulp cavity: usually shows the largest incisal-apical dimension, with a square or root shape
- Pulp horns: usually extend further incisally under the buccal cusp, may be blunted
- Pulp chamber floor: located below the cervical level
- Root canals: two canals, with the apical foramen appearing to exit at the tip of the root
Mesiodistal View
- Pulp horns: blunted from the mesial/distal aspect
- Pulp cavity: tapers slightly from the occlusal aspect to the apical foramen
- Apical foramen: appears to exit at the tip of the root
Cervical Cross Section
- Shape: kidney-shaped
- Pulp cavity: constriction adjacent to the developmental groove
- Some roots demonstrate 2 separated root canals
Lingual Aspect
- Lingual cusp: shorter by 1mm, sharper than the buccal cusp, smooth and spheroidal
- Mesial and distal outlines: convex
- Distal slope is longer than the mesial slope
- Lingual surface: convex at the middle â…“
- Cervical line: convex root-wise
Mesial Aspect
- Shape: trapezoid
- Smallest of the uneven sides is occlusally
- Buccal outline: convex with maximum convexity at the cervical â…“
- Lingual outline: evenly convex
- Cervical line: regular in outline curvature
Distal Aspect
- Curvature of the cervical line: less than mesial surface, almost flat
- Developmental grooves: less evident
- Root trunk: flattened with no outstanding developmental signs
- Single rooted buccal and lingual outlines: taper to a blunt apex
Common Features of Posterior Teeth
- Occlusal surface rather than incisal edge
- Greater relative buccolingual measurement as compared with mesiodistal measurement
- Broader contact areas
- Contact areas more nearly at the same level
- Less curvature of the cervical line mesially and distally
- Shorter crown cervicoocclusal when compared with anterior teeth
Maxillary Premolars
- 2 in the right (#14|#15) and 2 in the left (#24|#25)
- Assist the canines and molars in tearing and chewing food
- Have two cusps and sometimes one or two roots
Differences Between Upper First Premolar and Canine
- Contact areas are about the same level
- Root is shorter
- Mesial slope of buccal cusp is longer than distal slope, opposite to upper canine
- MD dimension is wider than canine
- Has 2 cusps, buccal and lingual
- Crown is angular shape
- Most have 2 roots and 2 canals
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