Differences between Deciduous teeth & Permanent teeth

Summary

The transcript outlines the key differences between deciduous (primary) and permanent teeth. It categorizes distinctions based on general features, crown morphology, enamel, dentin, pulp, and cementum. Deciduous teeth are fewer, shed naturally, and have a different dental formula compared to permanent teeth. Their crowns are smaller, lighter in color, and have more flaring roots. Enamel, dentin, and pulp are thinner, with larger pulp chambers relative to crown size. Additionally, the blood supply is more abundant in deciduous teeth, but nerve supply and cementum structure differ significantly between the two dentitions.

Takeaways

• 🦷 Deciduous teeth are also known as primary teeth due to their early eruption, while permanent teeth are called secondary teeth as they erupt later.
• 📅 The period of primary dentition lasts from 6 months to 6 years, whereas permanent dentition begins around 12 years and lasts for a lifetime.
• 🔢 There are 20 deciduous teeth (5 per quadrant) and 32 permanent teeth (8 per quadrant).
• 🦷 Deciduous dentition includes 2 incisors, 1 canine, and 2 molars per quadrant, while permanent dentition includes 2 incisors, 1 canine, 2 premolars, and 3 molars per quadrant.
• 🌈 Deciduous teeth are lighter in color (bluish-white) compared to permanent teeth, which are generally yellowish-white.
• 👑 The crowns of permanent teeth are generally larger and longer, while deciduous teeth are wider mesio-distally and appear more bulbous due to cervical constriction.
• 🔄 Permanent teeth roots are broader and within the crown's confines, while deciduous teeth roots are slender, shorter, and exhibit more flaring.
• 🦷 Enamel in deciduous teeth is thinner than in permanent teeth, with a horizontal orientation of enamel rods in deciduous teeth and apical in permanent teeth.
• 💧 The pulp chamber in deciduous teeth is relatively larger proportionally but less innervated than that in permanent teeth.
• 🧱 Deciduous teeth only have primary cementum, while permanent teeth have both primary and secondary cementum. The cemento-enamel junction types also vary between the two dentitions.

Q & A

What is the key difference between deciduous and permanent dentition?

The main difference is that deciduous (primary) teeth are temporary and physiologically shed, whereas permanent teeth are meant to last a lifetime without shedding.

How many teeth are in deciduous and permanent dentitions?

Deciduous dentition consists of 20 teeth, 5 in each quadrant, while permanent dentition has 32 teeth, 8 in each quadrant.

What is the dental formula for deciduous and permanent dentition?

In deciduous dentition, there are 2 incisors, 1 canine, and 2 molars per quadrant. In permanent dentition, there are 2 incisors, 1 canine, 2 premolars, and 3 molars per quadrant.

What developmental differences exist between deciduous and permanent teeth?

Deciduous teeth develop from the dental lamina, while permanent teeth develop from both the successional lamina (incisors, canines, and premolars) and the distal extension of the dental lamina (molars).

How does the crown size of deciduous teeth compare to permanent teeth?

The crown size of permanent teeth is larger than that of deciduous teeth, but deciduous teeth are wider mesio-distally in comparison to their crown length.

What is the color difference between deciduous and permanent teeth?

Deciduous teeth are lighter and have a bluish-white appearance, while permanent teeth are darker and more yellowish-white.

What is the significance of the cervical constriction in deciduous and permanent teeth?

Deciduous teeth show more pronounced cervical constriction, making the crown appear bulbous, while this constriction is less prominent in permanent teeth.

How does root morphology differ between deciduous and permanent teeth?

Deciduous teeth have shorter, more slender roots with more flaring, while permanent teeth have broader roots that lie within the confines of the crown.

What are the differences in enamel structure between deciduous and permanent teeth?

Enamel is thinner in deciduous teeth, and in the cervical third, the enamel rods are oriented horizontally, whereas in permanent teeth, they run in an apical direction.

How does the blood and nerve supply to the pulp differ between deciduous and permanent teeth?

The blood supply in deciduous teeth is more abundant, while the nerve supply is less dense compared to permanent teeth.