Anatomy of Teeth Flashcards
Identify the different components of teeth, periodontium, spaces, and supporting bone. Define the function and composition of all components of the teeth. Identify line angles and point angles on diagrams and extracted teeth. Properly name all line and point angles. Differentiate between anatomical and clinical crowns and roots. Differentiate between the different types of occlusion.
Class I Occlusion
Classic. Normal profile. Goal of orthodontics.
Class II Occlusion
Overbite, weak chin, heavy upper jaw, unbalanced. Forward positioned maxilla.
Class III Occlusion
Underbite, prominent chin, shallow looking cheekbones. Forward positioned mandible.
Clinical
What you can see intraorally
Anatomical
Whole crown or root, with respects to landmarks, regardless of eruption or damages to tissues
Clinical Crown
What is supragingival, what you can see
Anatomical Crown
From CEJ to occlusal plane
Clinical root
Portion of the anatomical root that is visible in the oral cavity
Anatomical root
Whole root, from CEJ to apex
Enamel
External layer of the crown. Hardest, most inorganic material 96% calcium hydroxyapatite**
Function: protection from chewing, biting, bacteria
Dentin
Found in crown and root, encased in enamel (crown) and cementum (root) 70% inorganic; mainly calcium hydroxyapatite**
Much softer than enamel. Cavities travel quicker once in the dentin.
Function: absorbing forces, shock absorber
Cementum
Covers dentin in the root. Thin outer layer covering the root. Much softer. Can be scaled off. Want to smooth it out so that bacteria has less surface area to live and grow. 50% inorganic
Function: anchoring site for PDL fibers
Pulp
Encased in dentin except at apical foramen. Loose connective tissue, nerves, blood vessels.
Functions: Carries blood vessels and nerves to the teeth. Extracted teeth become very brittle because no nutrients.
Occlusal Surface
Chewing portion of tooth
Facial Surface
Next to cheek
Lingual Surface
Next to tongue
Proximal Surface
See slide #19
The in between
Height of contour
see slide #21
Crest of curvature =where the tooth bulges the widest. Contact area is where the floss snaps through
Embrasures
see slide #22
Spaces formed from the curvatures where two teeth in the same arch contact
The Col
see slides 23/24
Depression half-way between the facial/buccal and lingual surfaces of the teeth. Site of probe placement
Diastema
Space between the teeth in permanent dentition (madonna), most common between teeth 8 and 9 (middle)
Primary Dentition
Primate Spaces. These are GOOD so that there is room for adult teeth to grow in without overlap.
