In IUPAC nomenclature, however, hexane is the unbranched isomer (n-hexane); the other four isomers are named as methylated derivatives of pentane and butane. IUPAC also uses the term as the root of many compounds with a linear six-carbon backbone, such as 2-methylhexane (C7H16), which is also called isoheptane.
Dentin is the substance between enamel or cementum and the pulp chamber. It is secreted by the odontoblasts of the dental pulp. The formation of dentin is known as dentinogenesis. The porous, yellow-hued material is made up of 70% inorganic materials, 20% organic materials, and 10% water by weight.
The surface enamel is the hardest layer, and under that is the second hardest layer, dentin. Dentin is important because it surrounds and connects to the pulp of the tooth, which is made up of living connective tissue and cells called odontoblasts, and found in the middle of your tooth. The pulp is where your blood vessels, nerves, and connective tissue are found, so you really donât want to mess that up. Problems start when you get a cavity that eats away your enamel, dentin and cementum - a calcified substance covering the root of a tooth - and exposes the pulp.