Question

two difference between pulp and dentine in tooth
please answer to my question
urgent tomorrow test please

Answer 1

Dentine is the main supporting structure of the tooth and is the second hardest tissue in the body after enamel. It is 70% mineral and acellular, as hydroxyapatite crystals, and 30% organic as water, collagen and mucopolysaccharide. The main structure is the dentinal tubule, which extends from the external surface to the pulp. There are approximately 30,000 - 40,000 tubules per square millimetre, which can transmit pain to the pulp if the dentine is exposed.

 DENTINE TYPES

Primary dentine forms before tooth eruption.Secondary dentine forms after eruption, as the tooth develops with age. It develops from the odontoblasts living within the pulp and is laid down in layers within the pulp cavity.Reparative or tertiary dentine forms as a result of trauma to the odontoblasts; this can be thermal, chemical, bacterial or mechanical. Tertiary dentine has few tubules and is darker in colour and very dense in structure.





Tooth pulp is the most vital part of the tooth, originating in the center of the tooth, underneath the enamel layer (the top layer) and the dentin layer (the second layer), in the pulp chamber. The shape of a pulp chamber varies based on the size of the tooth itself.

Tooth pulp is soft and consists of living blood vessels, connective tissue, and large nerves. Also commonly referred to as the nerve, the pulp branches out and continues down each root through the canals of the tooth and stops just shy of the apex, or tip, of the tooth.

You can have up to 52 total different pulp organs: 32 of the pulp organs can be found in your permanent teeth and 20 can be found in your primary teeth, also known as baby teeth. The pulp found in primary teeth is lost along with the teeth when they fall out or are removed from your mouth.

Functions of Tooth Pulp

The pulp has several important functions, including:

Sensory function: Pain from trauma to the dentin and/or pulp, differences in temperature, and pressure are caused by stimulation of the pulp.Formation of dentin: The pulp is responsible for the formation of dentin. In response to trauma, the pulp forms secondary dentin, also known as reparative dentin.Nourishment: The pulp contains blood vessels that keep blood flowing to help to prevent the tooth from becoming brittle by keeping it moisturized and nourished.


The Role of Dentin

The most important job of tooth pulp is to produce dentin, which is a calcified tissue that serves as the second layer of the tooth, supporting the enamel above it. Dentin is located directly above the pulp chamber, so if your tooth enamel or your gums erode, the dentin becomes exposed. This usually causes pain, especially when you eat or drink something that's hot or cold because the dentin stimulates your tooth pulp or nerve. Composing the majority of the tooth’s structure, dentin is both harder and denser than actual bone and varies in color. It can appear gray or black, but it most typically appears with a yellowish hue.