Permanent Maxillary Central Incisor | Tooth Morphology Made Easy

Summary

This dental education video delves into the maxillary permanent central incisor's development timeline, tooth notation across various numbering systems, and its key morphological features. It covers the tooth's calcification beginning at 3-4 months, crown completion by 4-5 years, and full root development by age 10. The video also explains tooth numbering in universal, Palmer, and FDI systems. It highlights the tooth's sharp mesio incisal angle, rounded distal incisal angle, and its cone-shaped root. The labial surface's developmental lines and cervical line's semi-circular outline are also discussed, along with the palatal surface's concave incisal portion and the cingulum's convexity.

Takeaways

• 🦷 The maxillary permanent central incisor begins calcification between 3 to 4 months of age.
• 🕒 The crown formation of the tooth is completed around 4 to 5 years of age.
• 🌱 The tooth erupts into the oral cavity at the age of 7 to 8 years, with the root completion by age 10.
• 🔢 In the Universal Numbering System, the right maxillary central incisor is number 8 and the left is number 9.
• 📏 In the Palmer Notation System, both right and left maxillary central incisors are numbered 1, with a symbol to differentiate sides.
• 🌐 In the FDI Notation System, the right central incisor is 11 and the left is 21.
• 📐 The central incisors are the widest mesio-distally among all anterior teeth.
• 🦷 The mesio incisal angle of the tooth is sharp, while the disto incisal angle is rounded.
• 🏔 The root of the tooth is conical in shape with a blunt apex.
• 📉 The cervical line at the junction of the crown and root has a semicircular outline.
• 👅 The palatal (lingual) surface of the tooth is concave in the incisal and middle portions with a convex cervical portion due to the cingulum.

Q & A

When does the first evidence of calcification of the maxillary permanent central incisor begin?

The first evidence of calcification of the maxillary permanent central incisor begins when the baby is three to four months old.

By what age is the crown formation of the maxillary permanent central incisor completed?

The crown formation of the maxillary permanent central incisor is completed around four to five years.

At what age does the maxillary permanent central incisor typically erupt?

The maxillary permanent central incisor erupts into the oral cavity by the age of seven to eight years.

By what age is the root of the maxillary permanent central incisor fully developed?

The root of the maxillary permanent central incisor is completed by the age of 10 years.

What is the tooth number for the maxillary right central incisor in the Universal Numbering System?

In the Universal Numbering System, the maxillary right central incisor is numbered as 8.

How is the maxillary left central incisor denoted in the Palmer Notation System?

In the Palmer Notation System, the maxillary left central incisor is denoted as 1.

What is the FDI notation for the maxillary right central incisor?

In the FDI notation system, the maxillary right central incisor is denoted as 1.1.

What are the key identification features of the maxillary permanent central incisor from the labial aspect?

The key identification features from the labial aspect include a sharp mesio incisal angle, a rounded disto incisal angle, a semi-circular cervical line, and developmental lines on the labial surface of the crown.

What is the shape of the root of the maxillary permanent central incisor?

The root of the maxillary permanent central incisor is cone-shaped with a blunt apex.

What are the characteristics of the palatal surface of the maxillary permanent central incisor?

The palatal surface, also known as the lingual surface, has a concave incisal and middle portion due to the presence of a depression or fossa, a convex cervical portion due to the cingulum, and a cervical line that curves incisally.

What are the two marginal ridges present on the palatal surface of the maxillary permanent central incisor?

The two marginal ridges present on the palatal surface are the mesial marginal ridge and the distal marginal ridge.

How does the labiolingual dimension of the maxillary permanent central incisor compare to its mesio-distal dimension?

The labiolingual dimension of the maxillary permanent central incisor is more than the mesio-distal dimension, with the crown being wider at the cervical third.