Estudo dos Dentes Naturais - Caninos

Summary

This detailed transcript focuses on the anatomy and characteristics of the upper and lower canine teeth. It explains how the contour of the vestibular surface differs, particularly the pentagonal shape of the upper canine due to its cusp, and the division of cusps into mesial and distal edges. The script also compares the lingual surface of both canines, noting features such as marginal ridges, crests, and fossae. Additionally, it highlights the differences in root length and the shape of the canine teeth, with the lower canine generally having a shorter, more flattened root. This information is vital for understanding the structural variations between the upper and lower canines.

Takeaways

• 😀 The upper canine tooth has a pentagonal outline on its vestibular surface due to the presence of five sides.
• 😀 The first cusp of the canine divides into two longitudinal ridges: mesial and distal, with the distal ridge being more rounded and longer.
• 😀 The mesial and distal edges of the upper canine converge towards the cervical region.
• 😀 The upper canine features a prominent enamel elevation on the vestibular surface that reflects light, forming a distinctive ridge.
• 😀 The cusp of the upper canine is aligned with the long axis of the tooth and is positioned in a convex vestibular face.
• 😀 The lingual face of the upper canine is narrower than the vestibular face, with well-developed marginal ridges and cingulum.
• 😀 The presence of a mesial and distal fossa on the lingual surface of the upper canine, with the mesial fossa typically being smaller.
• 😀 The upper canine root is long, sometimes twice the length of the crown, and has minimal apical deviation.
• 😀 The lower canine has a longer crown and a greater crown length-to-width ratio than the upper canine.
• 😀 The root of the lower canine is shorter than that of the upper canine, with notable mesio-distal flattening, and it typically has proximal grooves.

Q & A

What is the primary characteristic of the contour of the upper canine's vestibular surface?

The upper canine has a pentagonal contour on its vestibular surface, which is marked by the presence of five sides, contributing to its unique shape.

Why does the upper canine have a distinct cusp, and how is it divided?

The upper canine has a cusp that is divided into two longitudinal edges: the mesial edge and the distal edge. The mesial edge is shorter, while the distal edge is longer and more rounded.

How does the mesial and distal edges of the upper canine's cusp affect its shape?

The mesial edge is shorter and less rounded compared to the distal edge, which is longer, more rounded, and has a greater convergence towards the cervical region.

What is a notable feature seen on the vestibular surface of the upper canine when viewed from an incisal perspective?

When viewed from an incisal perspective, there is a pronounced enamel prominence that extends from the cusp to the center of the vestibular surface, forming a crest.

How does the lingual surface of the upper canine differ from the vestibular surface?

The lingual surface of the upper canine is narrower than the vestibular surface and exhibits well-developed marginal ridges and cingulum.

What is the significance of the cingulum and crest in the upper canine's lingual surface?

The cingulum and crest on the lingual surface of the upper canine help in reinforcing the enamel, and the crest often connects with the cusp tip, creating a clear demarcation.

What is the structural difference between the upper and lower canines' roots?

The root of the upper canine is generally longer and more robust compared to the lower canine, which has a shorter, more flattened root.

How does the mesial-distal axis of the lower canine differ from the upper canine?

The lower canine's crown is more elongated compared to the upper canine, with a greater length-to-width ratio. The mesial and distal faces of the lower canine are also more asymmetrical.

What are the key features of the lingual surface of the lower canine?

The lingual surface of the lower canine is more simplified compared to the upper canine, with less pronounced features like marginal ridges and cingulum. It also has a single, undivided lingual fossa.

How does the root of the lower canine differ in shape compared to the upper canine?

The root of the lower canine is more flattened mesio-distally and is generally shorter than the root of the upper canine, which is more round and longer.