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Slide 2 Dental Terminology Slide 3 Typodonts a model of each arch that contains all of the teeth in the jaw. You will work with maxillary (upper) and mandibular (lower) typodonts in the Tooth Preparation class. MaxillaryMandibular Slide 4 Tooth Types Anterior incisors and canines Posterior premolars and molars Slide 5 Anatomic vs. Clinical Crown Anatomic crown - The part of the tooth which is covered by enamel, and extends from the occlusal surface (or incisal edge) to the cementoenamel junction (CEJ) Clinical crown - that portion of enamel visibly present in the oral cavity; the visible portion of the tooth that is occlusal to the deepest part of the gingival crevice Slide 6 Tooth Structure Enamel outer covering of crown Dentin - covered by enamel on the crown and cementum on the root and surrounds the entire pulp Pulp contains nerve and blood supply Cementum outer covering of root of tooth DEJ - dentin enamel junction CEJ cementoenamel junction Gingiva - gums Slide 7 Numbering of Teeth Universal Systemused in clinic (#1-32) Maxillary teeth #1 16 starting in the patients upper right Mandibular teeth #17 32 starting in the patients lower left Slide 8 Numbering of Teeth International (FDI) Systemused in DentSim lab (#11, 21, 31, 41 for centrals) Slide 9 Terminology Incisal - any surface or movement towards the biting edges of anterior teeth Occlusal - any surface or movement towards the chewing surface of posterior teeth Mesial closest to midline Distal farthest from midline Occlusal surfaces Mesial (of #15) Distal (of #15) Slide 10 Walls of Cavity Preparation External wall - prepared cavity surface that extends to the external tooth surface and takes the name of the tooth surface (or aspect) it faces, eg. buccal wall Buccal Wall Buccal Side of Tooth Slide 11 Terminology Margins - the junctions of the preparation and the external surface of the tooth Slide 12 Walls of Cavity Preparation Buccal (Facial) cheek side Lingual tongue side Pulpal (floor) Gingival (floor) Axial wall between pulpal and gingival floors LingualBuccal Gingival floor Pulpal floor Axial wall Mesial Distal Slide 13 External outline (cavosurface margin) -the preparation outline created by the outer rim of the preparation Internal outline - the outline created by the pulpal floor Preparation retention - created by placing parallel or slightly converging walls within the preparation Internal outline External outline Slide 14 Internal line angle - line angle whose apex points into the tooth, eg. pulpal-axial line angle Point angle - junction of three surfaces of different orientations, eg. Distobucco-occlusal point angle Internal line angle Slide 15 Morphology Terminology Cusp - prominence created by the meeting of inclined surfaces on the occlusal aspect of the crown Fossa - rounded or angular depression in the occlusal enamel surface (represents the complete fusion of developmental enamel lobes) Central fossa - broad, angular depressed area in the central portion of the occlusal surface of molars Slide 16 Morphology Terminology Lingual fossa - a depression in the central portion of the incisor's lingual surface Cingulum - a pronounced convexity on the gingival third of the lingual surface of an anterior tooth Mammelones - 3 minor elevations that appear at the incisal edge of a newly erupted incisor Slide 17 Contact area - area on the mesial or distal of a tooth that touches the adjacent tooth Proximal surface mesial or distal surface of tooth Gingival embrasure - triangular spaces originating at the proximal contact areas between adjacent teeth called after the direction towards which they radiate Gingival papilla - soft tissue that occupies gingival embrasures Gingival embrasureGingival papilla Slide 18 Morphology Terminology Marginal ridge - elevated crest that forms the mesial and distal margins of the occlusal surface in premolars and molars Slide 19 Class I preparation a preparation that involves only the occlusal surface of the tooth (pit and fissure cavity) Slide 20 Class II preparation located on the proximal surfaces of the posterior teeth. Often includes the occlusal surface as well as proximal surface Slide 21 Class III preparation mesial or distal surface of anterior teeth. does not involve incisal edge Slide 22 Class IV preparation preparation of the proximal surface of an anterior teeth, which involves the incisal angle Slide 23 You will learn about all of this terminology in great detail once you begin dental school. These are just some basic definitions that will give you a head start. In Dentsim this year we will prepare Class I, II, and III preparations on the mandibular and maxillary arches.