Dentino enamel junction DEJ Dentino cemental junction DCJ 4 The Peridontium

Dentino enamel junction dej dentino cemental junction

This preview shows page 2 - 4 out of 5 pages.

Dentino- enamel junction (DEJ). Dentino-cemental junction (DCJ). 4. The Peridontium: Formed of two soft tissues (gingiva, periodontal ligament), and two hard tissues (cementum, alveolar bone). 5. Tooth Surfaces: Each tooth has five surfaces: facial, lingual, mesial, distal, masticatory. 6. Tooth Angles: Line angle: formed by the junction of two surfaces. Point angle: formed by the junction of three surfaces. 7. Division into thirds: The crown is divided horizontally and vertically into three portions or thirds. The root is divided into thirds only horizontally. Functions of the Teeth: 1. Mastication. 2. Appearance. 3. Speech. 4. Growth of jaws. Tooth Identification Systems: 1. Palmer Notation system: It utilizes simple brackets using number for the permanent teeth (1-8) and letter of alphabet for the deciduous (A-E). 2. The International Numbering System: Teeth are designed by using two digit system: a- The first digit is located at the left side of the number and indicate the quadrant, from 1 - 4 for the permanent, and from 5 - 8 for the deciduous. b- At the right side the second digit indicates the number of the tooth in the quadrant. PDF created with pdfFactory Pro trial version
Image of page 2