Dental Anatomy: Incisors and Canines

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Questions and Answers

What is a small elevation of enamel on a tooth surface known as?

Fossa

Cusp

Sulcus

Tubercle (correct)

Which permanent premolar is most likely to have two root canals?

Maxillary second premolar

Mandibular second premolar

Maxillary first premolar (correct)

Mandibular first premolar

Which characteristic is least typical for the maxillary second premolar?

Lingual cusp shorter than facial cusp

Facial cusp larger than lingual cusp

Two cusps are the same length

Facial cusp shorter and blunter than lingual cusp (correct)

In the comparison of cusps of the maxillary first premolars, which statement is correct?

Facial cusp is longer but not wider Signup and view all the answers

Which statement about maxillary first premolars is not true?

The roots are mesial and distal Signup and view all the answers

Which teeth erupt last in the dental sequence?

Maxillary canines Signup and view all the answers

Which tooth is least likely to be bifurcated?

Mandibular canine Signup and view all the answers

Which teeth are the first permanent teeth to erupt?

Mandibular first molars Signup and view all the answers

What is the primary morphological difference between mandibular lateral and central incisors?

The lateral incisor crown is rotated on its base. Signup and view all the answers

In comparison with the permanent maxillary canine, how does the permanent mandibular canine's mesiodistal crown width compare?

Somewhat narrower Signup and view all the answers

Which characteristic describes the maxillary canine in comparison with the mandibular canine?

It has a longer crown. Signup and view all the answers

Which anterior tooth is identified as exhibiting the most deviation in morphology?

Maxillary lateral incisor Signup and view all the answers

Which tooth is recognized as the smallest permanent tooth in the mouth?

Mandibular central incisor Signup and view all the answers

In what context is the mandibular lateral incisor most likely to have two root canals?

When it is a common morphological variation. Signup and view all the answers

Mesiodistal measurements of anterior tooth crowns usually indicate which characteristic?

Wider at the mesial than the distal. Signup and view all the answers

What is the largest, longest, and strongest root of the maxillary molar?

Mesiofacial root Signup and view all the answers

In Class II, Division II malocclusion, what is the position of the maxillary incisors?

Retruded Signup and view all the answers

How many lobes do maxillary laterals exhibit?

Two labial and two lingual lobes Signup and view all the answers

What is the likely dental situation for a 9-year-old with a gingival abscess on a deciduous molar?

Mixed dentition Signup and view all the answers

What is the appropriate treatment for an abscessed deciduous second molar?

Extraction of the affected tooth Signup and view all the answers

If the molar was removed, which statement would be incorrect?

A space maintainer is probably not necessary Signup and view all the answers

From an occlusal view, which tooth is wider on the lingual side than on the buccal side?

Maxillary first molar Signup and view all the answers

In Class I occlusion, how does the mandibular lateral incisor interact with opposing teeth?

Opposes the maxillary lateral incisor and canine Signup and view all the answers

How are the crowns of mandibular molars aligned in the alveolar bone?

Tilted to the distal and facial side Signup and view all the answers

What is the typical canal configuration for the permanent mandibular first molar?

Two root canals in the mesial root, one in the distal Signup and view all the answers

Which of the following teeth are most commonly congenitally missing?

Maxillary third molar, maxillary lateral incisor, mandibular canine, and mandibular third molar Signup and view all the answers

Where is the greatest convexity of the facial surface of anterior teeth located?

The middle third Signup and view all the answers

Which of the following is NOT a trait of the deciduous dentition?

Primary crowns are dark yellow in color Signup and view all the answers

What is a distinguishing feature of the maxillary first deciduous molar?

All of the above Signup and view all the answers

At 14 months of age, which deciduous teeth should normally be present in a child?

Central incisors, lateral incisors, canines, first molars Signup and view all the answers

What characteristic is commonly associated with primary teeth compared to permanent teeth?

Pulp chambers are larger in size Signup and view all the answers

Which deciduous teeth do not resemble any other deciduous or permanent teeth?

Deciduous maxillary first molar Signup and view all the answers

Which teeth are known to have three roots?

Permanent maxillary molars Signup and view all the answers

Where is the cusp of Carabelli of the permanent maxillary first molar sometimes located?

On the lingual surface Signup and view all the answers

Which tooth is considered the smallest in the human dentition?

Deciduous mandibular central incisor Signup and view all the answers

What differentiates the permanent mandibular incisors from the maxillary incisors?

Mandibular lateral incisor is larger than the central incisor. Signup and view all the answers

What are the excess spaces in the deciduous dentition for permanent canines and premolars called?

Leeway space Signup and view all the answers

Which permanent tooth is most likely to have two root canals?

Maxillary second premolar Signup and view all the answers

A dark radiolucent area at the apex of a mandibular second premolar could indicate which of the following?

An endodontic abscess Signup and view all the answers

Study Notes

Mandibular Lateral vs. Central Incisors

The mandibular lateral incisor is slightly larger than the central incisor.
The mandibular lateral incisor features an elongated distoincisal angle distolingually.
When viewed incisally, the crown appears slightly rotated on its base.

Permanent Mandibular Canine vs. Maxillary Canine

The permanent mandibular canine has a narrower mesiodistal crown width compared to the maxillary canine.

Maxillary Canine vs. Mandibular Canine

The maxillary canine has a relatively longer crown compared to the mandibular canine.
The maxillary canine is less likely to be bifurcated compared to the mandibular canine.
The maxillary canine has a less pronounced cingulum and less prominent lingual features compared to the mandibular canine.

Most Deviating Tooth in Morphology

The mandibular lateral incisor exhibits the most deviation in morphology among the anterior teeth.

Smallest Permanent Tooth

The mandibular lateral incisor is the smallest permanent tooth.

Tooth with Two Root Canals

The maxillary canine is most likely to have two root canals.

Mesiodistal Measurements of Anterior Teeth

The mesiodistal measurements of anterior teeth crowns are wider at the distal compared to the mesial side.

Largest, Longest, and Strongest Root of Maxillary Molar

The distofacial root is the largest, longest, and strongest root of the maxillary molar.

Missing Cusp of Maxillary Third Molar

The distofacial cusp is frequently missing from the maxillary third molar.

Oblique Ridge of Maxillary Molars

The oblique ridge of maxillary molars runs from the mesiobuccal to the distolingual cusp crossing the occlusal surface.

Lingual Height of Contour on Mandibular Molars

The lingual height of contour on mandibular molars is located at the junction of the occlusal and middle thirds.

Small Enamel Elevation

A small elevation of enamel on a tooth surface is known as a tubercle.

Permanent Premolar with Two Root Canals

The maxillary first premolar is most likely to have two root canals.

Maxillary Second Premolar Characteristics

The maxillary second premolar typically has two cusps that are approximately the same length.
However, it is atypical for the facial cusp to be shorter and blunter compared to the lingual cusp.

Maxillary First Premolar Characteristics

The facial cusp of the maxillary first premolar is longer but not wider than the lingual cusp.
The root usually has a single root trunk with mesial and distal roots.
The facial cusp tip is displaced to the distal from midline.

Last Erupting Teeth

The maxillary canines erupt last among these options: mandibular first premolars, maxillary canines, maxillary first premolars, mandibular canines.

Least Likely to Bifurcate

The mandibular canine is least likely to be bifurcated among these options: maxillary second premolar, mandibular canine, mandibular first premolar, and mandibular second premolar.

Least Likely to Have Two Root Canals

The maxillary premolar is least likely to have two root canals, among these options: mesiobuccal root of a maxillary molar, mesial root of a mandibular molar, maxillary premolar, and mandibular canine.

First Permanent Teeth to Erupt

The mandibular central incisors are the first permanent teeth to erupt.

Teeth with Fewest Proximal Contact Areas

Third molars have the fewest proximal contact areas among these options: central incisors, third molars, canines, and premolars.

Class Traits of All Molars

Molars have the largest occlusal surfaces of any teeth in the dentition.
Molars have three to five major cusps and two or three roots.

Ridge Connecting Cusps on Maxillary Molar

The oblique ridge connects the distobuccal and mesiolingual cusps on a maxillary molar.

Maxillary Incisors in Class II, Division II Malocclusion

In Class II, Division II malocclusion, maxillary incisors are retruded.

Maxillary Lateral Incisor Lobe Count

Maxillary laterals have two labial and two lingual lobes.

Clinical Case Study - 9 year old with Gingival Abscess

This child would likely exhibit a mixed dentition.

Appropriate Treatment for Abscessed Deciduous Second Molar

The appropriate treatment is extraction of the affected tooth.

Consequences of Removing the Abscessed Second Molar

A space maintainer may not be necessary.
The permanent replacement is expected to erupt soon.
The eruption pattern is likely earlier than in most children of his age.
The deciduous root (if present) will be very small.

Tooth Wider on the Lingual Side

The maxillary first molar is wider on the lingual side compared to the buccal side.

Cusp of Carabelli

The cusp of Carabelli on the permanent maxillary first molar may be absent, located lingual to the distolingual cusp, and can be the third largest cusp.

Longest and Shortest Cusps of the Maxillary First Molar

The mesiolingual cusp is the longest, while the distofacial cusp is the shortest on the maxillary first molar.

Mandibular Lateral Incisor in Class I Occlusion

In Class I occlusion, the mandibular lateral incisor opposes the maxillary lateral incisor and canine.

Permanent Mandibular Lateral Incisor Root vs. Central Incisor Root

The root of the mandibular lateral incisor is longer, but not wider than the permanent mandibular central incisor.

Alignment of Mandibular Molar Crowns

The crowns of mandibular molars are tilted to the distal and facial side.

Permanent Mandibular First Molar Root Canal Count

The permanent mandibular first molar typically has two root canals in the mesial root and one in the distal root.

Congenitally Missing Teeth

The four most frequently found congenitally missing teeth are: maxillary third molar, maxillary lateral incisor, mandibular third molar, and mandibular canine.

Greatest Convexity of Facial Surface of Anterior Teeth

The greatest convexity of the facial surface of anterior teeth is located in the cervical third.

Traits of Deciduous Dentition

Most primary teeth are smaller than their succedaneous permanent teeth.
The crowns of primary teeth are longer relative to their total length compared to permanent teeth.
In anterior primary teeth, the labial and lingual surfaces bulge conspicuously in the cervical third.

Distinguishing Feature of Maxillary First Deciduous Molar

All of the following: cusp relationship, buccal cervical ridge, and mesial profile are distinguishing features.

Deciduous Tooth Eruption at 14 Months

A child at 14 months old should have the following deciduous teeth present: central incisors, lateral incisors, first molars.

Deciduous Teeth that Do Not Resemble Others

Deciduous mandibular first molars and maxillary first molars are unique and do not resemble any other deciduous or permanent teeth.

Teeth with Three Roots

Permanent maxillary molars and deciduous maxillary molars have three roots.

Cusp of Carabelli of the Permanent Maxillary First Molar

The cusp of Carabelli may be missing entirely, located on the lingual surface, or located on the mesiolingual cusp.

Smallest Tooth in Human Dentition

The deciduous mandibular central incisor is the smallest tooth in the human dentition.

Differences Between Mandibular and Maxillary Incisors

Maxillary incisors are smaller than mandibular incisors.
The mandibular lateral incisor is larger than the central incisor.
Maxillary incisors have fewer pits and less-developed marginal ridges.
Mandibular incisors have more developed cingula.

Space Maintainers in Deciduous Dentition

The deciduous tooth most likely necessitating a space maintainer if lost prematurely is the first molar as it plays a significant role in maintaining the space for the permanent successor.

Permanent Tooth Most Likely to Have Two Root Canals

The maxillary canine is most likely to have two root canals.

Radiolucent Area at Apex of Mandibular Second Premolar

Possible interpretations of a dark radiolucent area at the apex of a mandibular second premolar include an endodontic abscess, a cementoma, or the mental foramen.

Tooth Abscess Response to Heat

An abscessed tooth is sensitive to heat and cold, so the first statement is true. The second statement is also true since an abscess is often caused by bacterial infection.