Anatomy of Permanent Maxillary First Premolars

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Questions and Answers

How many permanent maxillary premolars are there?

One on the right side of the maxilla and two on the left side

Two on the right side of the maxilla and two on the left side (correct)

One on the right side of the maxilla and one on the left side

Three on the right side of the maxilla and one on the left side

Why are premolars sometimes referred to as 'bicuspid'?

Because they succeed the deciduous molars

Because they are positioned in a more horizontal plane

Because they are located before the molars

Because most of them have two cusps (correct)

What is the difference in cusp development between anterior teeth and premolars?

Premolars have sharper cusps than anterior teeth

Anterior teeth have more lobes than premolars

There is no difference in cusp development between anterior teeth and premolars

The lingual lobe forms the cingulum in anterior teeth and forms the lingual cusp in premolars (correct)

Why are premolars considered to resemble canines from the buccal aspect?

Because they have long and sharp buccal cusps that aid in tearing food Signup and view all the answers

Why is the term 'bicuspid' not generally accepted for premolars?

The mandibular second premolar has three cusps, making 'bicuspid' inaccurate Signup and view all the answers

What is the distinguishing feature of maxillary first premolars?

Two sharp cusps with the buccal cusp longer than the lingual cusp Signup and view all the answers

Why are marginal ridges in premolars considered part of the occlusal surface of the crown?

Due to the cusp development being buccal & lingual, positioning them horizontally Signup and view all the answers

What is a common characteristic of posterior teeth compared to anterior teeth?

Greater curvature at the cervical line Signup and view all the answers

Which statement is true about the contact areas of maxillary first premolars?

The contact area is at the middle third and relatively broad curvature mesially Signup and view all the answers

What is the distinguishing feature of maxillary premolars when they have two roots?

One root placed buccally and one root placed lingually Signup and view all the answers

What is the distinguishing developmental depression found on the mesial surface of the crown of maxillary first premolars?

Extends to the root and has a central groove Signup and view all the answers

What is a distinguishing feature of the buccal aspect of maxillary first premolars?

Convex buccal surface with well-developed middle buccal lobe Signup and view all the answers

What is true about the surface anatomy of the buccal root of maxillary first premolars?

Similar to that of canines but shorter Signup and view all the answers

Which statement accurately describes the dimensions of maxillary premolars?

The premolar crowns & roots are shorter than those of the maxillary canines, but their crowns are a little longer than those of molars. Signup and view all the answers

What is common to all posterior teeth compared to anterior teeth?

Greater faciolingual measurement as compared with mesiodistal measurement Signup and view all the answers

Which statement accurately describes the surface anatomy of maxillary first premolars?

The buccal surface is convex with well-developed middle buccal lobe to a developmental depression mesial and distal to buccal ridge at or occlusal to the middle third. Signup and view all the answers

What is the common characteristic of maxillary premolars compared to anterior teeth?

Greater faciolingual measurement Signup and view all the answers

What is the distinguishing feature of the buccal cusp of the maxillary first premolar?

Long and pointed Signup and view all the answers

Where does the bifurcation of roots often occur in the maxillary first premolar?

Middle third Signup and view all the answers

What is the shape of the crown of maxillary first premolar from the buccal aspect?

Angular and trapezoidal Signup and view all the answers

What is the maximum convexity on the buccal surface of maxillary premolars?

Cervical third Signup and view all the answers

What are the identifying features of maxillary first premolars?

Two sharp cusps, prominent buccal line angles Signup and view all the answers

What is the difference in root outline between the mesial and distal roots of maxillary premolars?

Tapering to a pointed apex Signup and view all the answers

Why are maxillary premolars sometimes referred to as 'bicuspid'?

Due to their two sharp cusps Signup and view all the answers

What is the distinguishing characteristic of the contact area in maxillary first premolars?

Relatively broad curvature representing the contact area Signup and view all the answers

Why do maxillary premolars have greater faciolingual measurement compared to mesiodistal measurement?

To have broader contact areas Signup and view all the answers

Which vital sign measures how hot the body is?

Temperature Signup and view all the answers

What is the medical term for fast pulse rate?

Tachycardia Signup and view all the answers

Why are glass thermometers with mercury not recommended for measuring body temperature?

Glass may break and mercury is poison Signup and view all the answers

What method of measuring body temperature is about 0.5°C higher than oral temperature in infants and small children?

Rectum Signup and view all the answers

What is the normal respiratory rate for adults in terms of breaths per minute?

12-16 breaths/min Signup and view all the answers

What is the medical term for high body temperature?

Fever Signup and view all the answers

Study Notes

Maxillary Premolars

There are four permanent maxillary premolars.
Premolars are sometimes called “bicuspids” because they typically have two cusps.
Premolars are considered to resemble canines from the buccal aspect because they have a prominent buccal cusp and a single root.
The term “bicuspid” is not generally accepted for premolars because some premolars may have more than two cusps.
The distinguishing feature of maxillary first premolars is the presence of a prominent mesial marginal ridge.
Marginal ridges in premolars are considered part of the occlusal surface of the crown because they contribute to the chewing surface.
Posterior teeth are wider faciolingually than anterior teeth.
The contact areas of maxillary first premolars are asymmetrical with a smaller contact area on the mesial as compared to the distal.
Maxillary premolars have two roots when the buccal root bifurcates.
The mesial surface of the crown of maxillary first premolars has a developmental depression called a “groove”.
The buccal aspect of maxillary first premolars has a prominent buccal cusp and a mesial marginal ridge.
The buccal root of maxillary first premolars has a convex buccal aspect.
Maxillary premolars are generally shorter and smaller than the molars.
The distinguishing feature of posterior teeth is that they are wider faciolingually than anterior teeth.
The buccal cusp of maxillary first premolars is the strongest cusp.
The bifurcation of roots often occurs near the furcation.
Maxillary first premolars are typically ovoid in shape from the buccal aspect.
The buccal surface of maxillary premolars has maximum convexity just below the cusp tip.
The identifying features of maxillary first premolars include the prominent buccal cusp, a mesial marginal ridge, and a prominent groove on the mesial surface.
The mesial root of maxillary premolars is typically more rounded compared to the distal root which is more ovoid.
Maxillary premolars are sometimes called “bicuspids” because they typically have two cusps and a crown shape that resembles a canine.
The contact area in maxillary first premolars is typically larger on the distal surface than on the mesial surface.
Maxillary premolars have a greater faciolingual measurement compared to mesiodistal measurement because their crown shape allows for greater shearing forces during mastication.

Temperature Measurement

Temperature is a vital sign and is measured in degrees Celsius (°C) or Fahrenheit (°F).
A fast pulse rate is called tachycardia.
Glass thermometers with mercury are not recommended for measuring body temperature because they can be hazardous if broken.
Rectal temperature is about 0.5°C higher than oral temperature in infants and small children.
Respiratory rate is the number of breaths per minute.
The normal respiratory rate for adults is 12-20 breaths per minute.
High body temperature is known as fever or pyrexia.

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Description

Learn about the general features and characteristics of permanent maxillary first premolars, including their position in the dental arch, the reason for their name, and the number of cusps they typically have. Explore why the term 'bicuspid' is not universally accepted and understand the absence of premolars in deciduous dentition.