oral anatomy lesson 4

ORAL ANATOMY LESSON 4

TEETH AND SUPPORTING STRUCTURES

FUNCTIONS OF TEETH: MASTICATION SHAPING OF FACE SPEECH PROTECTIVE PREHENSILE - ability to grab food

by hands

DENTAL CONSONANTS – F S & T

ANATOMICAL FEATURES:ANATOMICAL CROWN – part of the tooth covered by enamel from cervix to the tip of the crown

CLINICAL CROWN – part of the tooth that is visible in the mouth and exposed to the oral fluids

PERIODONTIUM – histologic structure of the oral cavity

ANATOMICAL ROOT – part of the tooth covered by cementum from the cervix to the apex of the root

CLINICAL ROOT – part of the tooth still implanted and surrounded by periodontium

CERVICAL LINE/CERVIX/NECK – line of separation between crown and root portion also known as CEMENTOENAMEL JUNCTION (CEJ)

DENTAL TISSUES – histologic partsTOOTH TISSUE PROPER: HARD DENTAL TISSUES –

mineralizedo ENAMEL – hard mineralized

tissue that is said to be 96-98% calcified and is the hardest tissue in the body. It is brittle, inelastic, translucent and it serves as a protective layer to the dentin

o DENTIN – a hard tissue that forms the main bulk of the tooth and surrounds the

pulp cavity. It is said to be 60-70% calcified, gives the form and shape of the tooth, light yellowish in color and is said to be slightly elastic which makes it carry the stress of mastication

o CEMENTUM – covers and protects the dentin of the roots of the tooth. Ii is 45-55% calcified, light yellowish and dull in color and is usually responsible for the repair of tooth

SOFT DENTAL TISSUES o PULP – the only soft dental

tissue of the tooth found at the innermost portion of the tooth and is said to be the only part of the tooth that is alive

o PULP TISSUE – pinkish in color, uncalcified and is made up of blood vessels, nerves and cellular substances

PARTS OF THE PULP: CORONAL PULP – part of the pulp

found at the coronal area RADICULAR PULP – part of the

pulp found at the root area

FUNCTIONS OF PULP TISSUES: NUTRITIVE FORMATIVE DEFENSIVE PROTECTIVE SENSORY

TERTIARY DENTIN – stimulation of the pulp tissues to regenerate when you put calcium hydroxide (CaOH) on top of an exposed pulp

PARTS OF PULP CAVITY: PULP CHAMBER – an enlarged

portion of the pulp cavity that lies in the ventral portion of the anatomical crown

PULP HORN – an elevation of pulp chamber on its elongated portion

PULP CANAL/ROOT CANAL – part of the pulp cavity found on the root area that is large at the cervical

part of the root and is constricted towards the apex of the root

APICAL FORAMEN – where blood and nerve supply enters and leaves the tooth

-Rosette Go 071008