Dental Anatomy: Lecture 2 Introduction

Tooth numbering systems:
1.Universal notation system
2.Zsigmondy/Palmer notation system
3.Fédération Dentaire Internationale “FDI” notation system

Tooth portions (crown & root):
?Each tooth is divided into two parts, the crown and the root.
?The crown portion of the tooth is covered with enamel and it is defines as the anatomical crown, while the root portion is covered by cementum and it is defined as the anatomical root.
?Clinical crown: is that portion of the tooth that is normally visible in the oral cavity and exposed to the fluids of the mouth.
?Clinical root: is that portion of the tooth that is embedded in the periodontal tissues which surround the tooth.
?Both of the 2 portions (anatomical crown and anatomical root) join each other at the cemento-enamel junction “CEJ” or the cervical line “cervix”.

?The enamel, cementum and dentine are the three hard tissues of the tooth, and the dentine forms the major bulk of the tooth structure. While, the fourth tissue of the tooth is the pulp which is the soft tissue, within the dentin providing blood supply, innervation and connective tissue. The primary function of the pulp is to produce dentin.
?The pulp consists of two parts, the pulp chamber and the pulp canal. The pulp chamber is that part of the dental pulp inside the crown, while the pulp canal is inside the root.