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Orofacial Anatomy

Module I

Maxilla Upper arch; fixed, made of 2 fused bones
Mandible Lower, arch; mobile, made of single horseshoe shaped bone
Primary/deciduous dentition Made of 20 teeth: 10 maxillary and 10 mandibular Exfoliate, fall out, by age 12 or 13
Permanent/succedaneous Made of 32 teeth: 16 maxillary and 16 mandibular
Emergence an EVENT such as when the tooth emerges from gingiva
Eruption a PROCESS such as the act of a tooth moving occlusally and becoming visible in the oral cavity
4 Functional Categories of Teeth 1.Incisors 2.Canine 3.Premolars 4.Molars
Anterior teeth Incisors and canines
Posterior teeth Premolars and molars
Primary Dental Formula I (2/2) C(1/1) M(2/2) = 10 teeth on each side of the midline
Permanent Dental Formula I (2/2) C(1/1) P(2/2) M(3/3) = 16 teeth on each side of midline
4 Tissues of the Tooth 1.Cementum 2.Enamel 3.Dentin 4.Pulp
Cementum dull yellow CALCIFIED tissue that covers the anatomic root; it develops from the mesoderm
Enamel hardest (calcified) tooth tissue; cover anatomical crown; develops from the ectoderm
Dentin hard (calcified) tissue underlying enamel and cementum and making up bulk of the tooth; develops from mesoderm
Pulp soft (non-calcified) tissue which develops from the dental papilla(mesoderm); located within the pulp cavity of a tooth
Formative Function of Dental Pulp odontoblast cells of pulp produce dentin throughout life of tooth
Sensory Function of Dental Pulp pulp senses pain from heat, cold, drilling, sweets, decay, trauma, and infection
Nutritive Function of Dental Pulp Feeds the tooth
Defensive/Protective Function of Dental Pulp pulp responds to injury or decay by forming secondary or sclerotic dentin
Pulp Chamber located in the crown of anterior teeth; located partly in the crown but mostly in the cervical part of the root of posterior teeth; one per tooth; is lined with odontoblasts
Root Canals continuation of the pulp chamber; near or at the root apices are opening (1 or more) called apical foramen
Anatomic Crown part of a tooth that has an enamel surface
Clinical Crown part of a tooth that is exposed to the oral cavity
Anatomic Root part of a tooth that has a cemental surface
Clinical Root part of a tooth that is not exposed to the oral cavity
Apex Root tip or peak at the end of the root
Root Trunk part of the root of molars or bifurcated premolars near the CEJ; extends from the CEJ to the furcation area
Cervix part of the root or crown near the CEJ
Bifurcation division of one into two branches
Trifurcation division of one into three branches
Cervical Line (CEJ) cementoenamel junction
Mesial surface toward or adjacent to the midline
Distal surface away from the midline
Facial outer surface of the teeth collectively
Labial surface of anterior teeth towards the lips
Buccal surface of posterior teeth near the cheek
Lingual surface near tongue or palate
Palatal surface of maxillary teeth near the palate
Occlusal masticating (chewing) surfaces of posterior teeth
Incisal cutting edge, ridge, or surface of anterior teeth
Interproximal between teeth
Contact area area where the tooth touches the tooth adjacent to it in the same arch
Alveolar bone portion of the jaw bone which supports the teeth
Alveolus bony socket of a tooth
Cingulum enlargement on the cervical third of the lingual surface of the crown of anterior teeth
Crest of curvature highest point of a curve or the area of greatest convexity or bulge
Cusp point or peak on the occlusal surface of posterior teeth and on the incisal edge of canines
Cusp slopes inclined surfaces that form an angle at the cusp tip when viewed from the facial or lingual aspects
Developmental groove sharply declined,narrow, linear depression formed during tooth development
Dilaceration abnormal condition (anomaly) of a tooth that has the crown, root, or both twisted
Embrasures V-shaped spillway space between the contact areas of adjacent teeth at the facial, lingual, or occlusal surface
Fissure narrow channel formed a the bottom of a developmental groove
Fossa depression found on the lingual surface of some anterior teeth and on the occlusal surface of all posterior teeth
Line angle line formed at the meeting point of two surfaces
Lobes primary centers from which teeth develop
Mamelon one of three tubercles (bulges) often seen on newly erupted central incisors; usually war off once the tooth comes in to functional, normal position; represent the three lobes of the central incisors (mesial, middle, and distal)
Midline term for the dividing line between the right and left sides of the body; it falls between the central incisors
Perikymata fine horizontal lines on the enamel surface of the crown of newly erupted teeth; eventually disappears due to abrasion from eating and tooth brushing
Pit small, often deep fault of depression, formed at the union or intersection of two or more developmental grooves or sometimes at the end of a single groove
Quadrant one of the four parts or quarters of the dentition
Ridge area at which two slopes meet
Root axis line determined by bisecting the root at the cervix
Supplemental groove small, irregularly placed grooves usually found on occlusal surfaces
Created by: FoxHunt42



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