Primary enamel cuticle

Primary Enamel Cuticle

File:Tooth enamel.jpg

Illustration of a tooth showing the enamel layer

The Primary Enamel Cuticle, also known as Nasmyth's membrane or enamel cuticle, is a thin layer that covers the outer surface of the tooth enamel immediately after tooth eruption. It is a residue of the enamel organ and is composed of tissue from both the inner enamel epithelium and the outer enamel epithelium.

Formation

The primary enamel cuticle is formed during the late stages of tooth development. The ameloblasts, which are responsible for the formation of enamel, secrete a thin layer of material onto the surface of the enamel. This layer is the primary enamel cuticle. It is initially soft and easily removable, but it hardens and becomes more resistant over time.

Composition

The primary enamel cuticle is composed of two layers: the basal lamina and the cuticle proper. The basal lamina is a thin layer of extracellular matrix that separates the ameloblasts from the enamel, while the cuticle proper is a layer of keratinized material that is secreted by the ameloblasts.

Function

The primary function of the primary enamel cuticle is to protect the underlying enamel from the oral environment. It acts as a barrier against bacteria, acids, and other harmful substances that can cause tooth decay. Additionally, it provides a smooth surface for the tooth, which aids in mastication and speech.

Clinical Significance

The primary enamel cuticle can be affected by various dental conditions. For example, it can be worn away by excessive tooth brushing or by acidic foods and drinks. This can lead to increased sensitivity and susceptibility to tooth decay. Furthermore, the presence of the primary enamel cuticle can affect the adhesion of dental materials, such as dental sealants and bonding agents.

See Also

• Tooth development
• Tooth enamel
• Ameloblasts