Dental Anatomy M.E. Mermigas, DDS.

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Presentation transcript:

Dental Anatomy M.E. Mermigas, DDS

Nomenclature Maxilla Mandible M.E. Mermigas, DDS

Deciduous Teeth Primary Teeth Post-natal development spans 2-1/2 years Usually 20 in number 4 incisors 2 canines 4 molars per arch M.E. Mermigas, DDS

Deciduous Teeth In clinical practice they are designated by letters: A to T M.E. Mermigas, DDS

Permanent Teeth Development begins with the eruption of the first molars and exfoliation of the deciduous incisors Process requires 20 years to complete Usually 32 in number In clinical practice they are designated by numbers: 1 to 32 M.E. Mermigas, DDS

The Crown and Root Crown- portion above the gingivae covered with enamel Root- portion below covered with cementum They are joined at the cemento-enamel junction (CEJ) M.E. Mermigas, DDS

Dentin Comprises the main bulk of tooth structure Histologically analagous to bone in composition M.E. Mermigas, DDS

Pulp Chamber and Canal Contain the pulpal tissue Nervous, arteriolar and venous tissue fibrous tissue M.E. Mermigas, DDS

The Crown Incisors have an incisal edge Canines have a single cusp Premolars and Molars have 2 or more cusps These are the cutting surfaces of the teeth M.E. Mermigas, DDS

Incisor M.E. Mermigas, DDS

Canine M.E. Mermigas, DDS

Premolar M.E. Mermigas, DDS

Molar M.E. Mermigas, DDS

The Root May be single or multiple Firmly positioned in the boney process of the jaw called the alveolus The alveolus together with the teeth forms the dental arch The cervical area of the teeth are usually covered with a soft tissue, the gingivae M.E. Mermigas, DDS

Surfaces and Ridges Incisors and Canines- four surfaces and a ridge Molars and Premolars- five surfaces M.E. Mermigas, DDS

Surfaces- named according to positions and uses Facial- toward the lips or cheeks Lingual- toward the tongue M.E. Mermigas, DDS

Surfaces Occlusal- come in contact with those of the opposing jaw, molars and premolars only Incisal- Those surfaces on the incisors and canines coming into contact with the opposing teeth M.E. Mermigas, DDS

Proximal Surfaces Surfaces coming into contact with the adjacent teeth Mesial- toward the midline Distal- away from the midline Which teeth have the mesial surfaces touching each other? M.E. Mermigas, DDS

Cusp an elevation or mound on the crown portion of a tooth making up a divisional part of the occlusal surface M.E. Mermigas, DDS

M.E. Mermigas, DDS

Tubercle A smaller elevation on the same portion of the crown produced by an extra formation of enamel. Deviation from typical form. M.E. Mermigas, DDS

Cingulum The lingual lobe of an anterior tooth M.E. Mermigas, DDS

M.E. Mermigas, DDS

Ridge Any linear elevation on the surface of a tooth and is named according to its location M.E. Mermigas, DDS

Marginal Ridge Those rounded borders of enamel that form the mesial and distal margins of the occlusal surfaces of premolars or molars, and the lingual surfaces of anterior teeth M.E. Mermigas, DDS

M.E. Mermigas, DDS

Triangular Ridges descend from the cusp tips of molars and premolars toward the central part of the occlusal surface M.E. Mermigas, DDS

M.E. Mermigas, DDS

Oblique Ridge Crosses the occlusal surface of maxillary molars in an oblique fashion M.E. Mermigas, DDS

M.E. Mermigas, DDS

Fossa An irregular depression or concavity M.E. Mermigas, DDS

M.E. Mermigas, DDS

Sulcus A long depression or valley in the surface of a tooth between ridges and cusps M.E. Mermigas, DDS

M.E. Mermigas, DDS

Developmental Groove A shallow groove or line between the primary parts of the crown or root M.E. Mermigas, DDS

M.E. Mermigas, DDS

Pits Small pinpoint depressions located at the junction of the developmental grooves M.E. Mermigas, DDS

M.E. Mermigas, DDS

M.E. Mermigas, DDS

M.E. Mermigas, DDS