Neonatal Line | Pellicle | Tomes process

Neonatal Line

Question 1. Neonatal line.
Answer:

• Neonatal line is an enlarged stria of the retzius that apparently reflects the great physiologic changes occurring at birth.
• Neonatal line is seen as a brown line separating enamel formed and mineralized before birth and enamel mineralized after birth.
• Deciduous teeth and a permanent 1st molar are formed.

“Neonatal Line Placement”

• Partly before birth and partly after birth, hence, a neonatal line is present in these teeth.
• They are more frequently absent in boys than girls suggesting boys are less dentally mature.
• Their location varies in preterm and post-term births.

“Neonatal Line And Tubes”

“Neonatal Line Complications”

Question 2. Pellicle.
Answer:

• The surface of the enamel of newly erupted teeth is covered by a pellicle, n It is secreted by the salivary proteins.
• Pellicle can be removed easily after the tooth is mechanically polished, n But it is reformed within hours.
• Within a day or two, after its formation, microorganisms are colonized over it to form dental plaque.

“Neonatal Line Insertion”

Question 3. Tomes process.
Answer:

• The projections of ameloblasts in the enamel matrix are known as the tomes process.
• They show a ‘picket fence’ arrangement.
• They contain secretory granules, rough endoplasmic reticulum, and mitochondrial.

“Neonatal Line And Catheterization”

• Tomes process appears during the prcsccretory phase of amelogenesis.
  When enamel formation begins, the tomes process comprises only a proximal portion.
• Later on, ameloblasts migrate away from the dentin surface and develop the distal portion of the tome’s process.
• After the development of both portions, the secretion of enamel proteins becomes staggered.