Dentino-enamel Junction (DEJ): The internalline created by the meeting of the dentin andenamel in the anatomical crown of the tooth.Cementum(hard tissue): Hard tissue resembling bone which covers the dentin of the anatomical root ofthe tooth. Less dense than dentin. Only about 1 mm thick.Cemento-enamel Junction (CEJ):Irregular anatomical line around the neck of the toothindicating the junction of the enamel of the crownand the cementum of the root. Also known asthe cervical line.Cervix: Constricted area of the crown and root adjacent to the CEJ.Pulp (soft tissue): Soft connective tissuefound in the center portion of the tooth entirely surrounded bydentin. The functions of pulp are:1.Formation of dentin(Odontoblasts): Maintains this capacity throughout life.a.Primary Dentin: Laid down during the period of tooth formation.b.Secondary Dentin: Laid down during rest of tooth’s life.i.Reparative: Formed in response to irritant (cavies, thermal, functional).ii.Physiological: Formed in response to normal aging process. Dentin formation isconsistent and uniform manner.2.Nutrition: Blood and lymph vessels. Maintain vitality of pulp.3.Sensation: Nerve tissue (reaction to cold and clenching: periodontal ligament response).4.Defense and protection: Formation of reparative secondary dentin in response to irritants.Pulp Chamber: Portion of pulp inside the anatomical crown.Pulp Canal: Portion of pulp inside the anatomical root.Pulp Horn: Pointed incisal/occlusal limit of pulp cavity. Is reflective of the lobes and cusp patterns of tooth.Apical Foramen: Constricted opening near root apex through whichmain nutrientand nervous supplyenter/exit.Lateral Canal: Small canal usually extending in horizontal fashion.Supplemental Canal: A canal excess of normal number.Anastomosis: Horizontal connection between pulp canals.
Morien 7Endodontics: Treatment of the pulp cavityand its tissues. Proper treatment requires knowledge ofnormal number of root canals, dimensions, contoursand shapesof the pulp cavities.Steps of endodontic process:1.Accessing canals.2.Cleaning and shaping canals.3.Objurgating(filling) canals.Failure results from: (1) Improper instrumented canals, (2) undetected canals (un-instrumented)and (3)supplemental canals.Radiographs: Give 2-D images of a 3-D object. They show pulp cavity in the mesial-distal cross section,but not show facial-lingual aspect.Supporting Structures of the Teeth:Alveolar Process: Bone that surrounds and supports the teethin the maxilla or mandible.Alveolus(tooth socket): Cavityor socket in the alveolar processof the maxilla or mandible in which theroot of the tooth is fixed.Periodontal ligament: Formative, supportiveand sensory connective tissuebetween the root of thetooth and its alveolus. Fibrous attachmentof the tooth cementumto the alveolar bone.