16 Questions
What is the function of the diastema found in some persons?
Normal space between the two upper central incisors
How many surfaces do all teeth have?
5
The lingual surfaces of most teeth are broader than the labial or buccal surfaces. (True/False)
False
What are the shapes of the labial and lingual surfaces of the crown of maxillary central incisors?
Trapezoidal
The lingual surfaces converge to accommodate the larger arch size ______________ than lingually.
facially
Match the following terms with their definitions:
Cervical ridge = Elevations at the cervical third of the labial surface Mammelons = Elevations at the incisal third of newly erupted teeth Lingual fossa = Deep depression on the lingual surface of some teeth Root canal = The canal present in the root that houses the dental pulp
What is the characteristic of the lingual fossa of the maxillary lateral incisor?
More concave than the maxillary central incisor
What is the characteristic of the root length of the maxillary lateral incisor?
Longer than the maxillary central incisor
What is the shape of the incisal outline of the maxillary lateral incisor?
Rounded
What is the location of the contact area on the distal surface of the maxillary lateral incisor?
Cervically located
What is the characteristic of the pulp horns in the pulp chamber of the maxillary lateral incisor?
Rounded and less sharp
What is the number of root canals in the maxillary lateral incisor?
One
What is the location of the lingual pit in the maxillary lateral incisor?
Close to the cingulum
What is the characteristic of the labial surface of the maxillary lateral incisor?
Convex
What is the shape of the cingulum in the maxillary lateral incisor?
Well developed
What is the characteristic of the incisal aspect of the maxillary lateral incisor compared to the maxillary central incisor?
Narrower
Study Notes
Permanent Maxillary Central Incisor
- Located first from the midline, with a normal space (diastema) between the two upper central incisors in some people
- Broadest and longest of all incisors, and most prominent
- Has 5 surfaces: labial, lingual, mesial, distal, and incisal
Geometric Outline of the Crown
- Labial and lingual surfaces have trapezoidal outline, with the smallest uneven side cervically and longest incisally
- Mesial outline is slightly convex, while distal outline is more convex
- Cervical outline is convex root-wise
Surface Anatomy of the Crown
- Labial surface:
- Elevations: cervical ridge and mamelons in newly erupted teeth
- Depressions: shallow 2 developmental grooves
- Lingual surface:
- Elevations: marginal ridges, cingulum, and incisal ridge
- Depressions: lingual fossa
- Proximal surfaces have triangular outline, with base cervically and apex incisally
Root Anatomy
- Cone-shaped with a blunt apex, centralized on the long axis of the tooth
- Extraction should be done by rotation movement
Maxillary Lateral Incisor
- Smaller in all dimensions except root length, which is longer
- May be cone-shaped (peg-shaped) due to absence of middle lobe
- Incisal outline is rounded with rounded incisal angles
- Single root with pointed apex curved distally
Lingual Surface of Maxillary Lateral Incisor
- Elevations: well-developed marginal ridges and cingulum
- Depressions: lingual fossa, which is more concave than that in the maxillary central incisor
- Note: a lingual pit (faulty pit) could be found near the cingulum, which is a point of decay
Pulp Cavity
- Formed of pulp chamber and root canal
- Pulp chamber outline follows the outline of the crown, with pulp horns related to each mamelon in young teeth
- Root canal is present in the root and follows its outline, ending in an apical foramen
Permanent Maxillary Central Incisor
- Located first from the midline, with a normal space (diastema) between the two upper central incisors in some people
- Broadest and longest of all incisors, and most prominent
- Has 5 surfaces: labial, lingual, mesial, distal, and incisal
Geometric Outline of the Crown
- Labial and lingual surfaces have trapezoidal outline, with the smallest uneven side cervically and longest incisally
- Mesial outline is slightly convex, while distal outline is more convex
- Cervical outline is convex root-wise
Surface Anatomy of the Crown
- Labial surface:
- Elevations: cervical ridge and mamelons in newly erupted teeth
- Depressions: shallow 2 developmental grooves
- Lingual surface:
- Elevations: marginal ridges, cingulum, and incisal ridge
- Depressions: lingual fossa
- Proximal surfaces have triangular outline, with base cervically and apex incisally
Root Anatomy
- Cone-shaped with a blunt apex, centralized on the long axis of the tooth
- Extraction should be done by rotation movement
Maxillary Lateral Incisor
- Smaller in all dimensions except root length, which is longer
- May be cone-shaped (peg-shaped) due to absence of middle lobe
- Incisal outline is rounded with rounded incisal angles
- Single root with pointed apex curved distally
Lingual Surface of Maxillary Lateral Incisor
- Elevations: well-developed marginal ridges and cingulum
- Depressions: lingual fossa, which is more concave than that in the maxillary central incisor
- Note: a lingual pit (faulty pit) could be found near the cingulum, which is a point of decay
Pulp Cavity
- Formed of pulp chamber and root canal
- Pulp chamber outline follows the outline of the crown, with pulp horns related to each mamelon in young teeth
- Root canal is present in the root and follows its outline, ending in an apical foramen
Learn about the characteristics and features of the maxillary central incisor, including its shape, size, and surfaces.
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