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Dental Anatomy Unit 2
What are the three major functions of teeth?
Mastication, Esthetics, Phonetics
The hard and soft supporting tissues of a tooth
What are the characteristics of the most primitive teeth?
Conical in shape and composed of one cone or lobe; homodont and can only move their jaw up and down
A primary division of the tooth
Permanent Anterior Teeth Lobes
3 labial: Mesiolabial, Middle Labial, Distolabial and 1 Cingulum Lobe: Lingual Lobe
Permanent Posterior Teeth Lobes
3 Buccal: Mesiobuccal, Middle Buccal, Distobuccal and 1 Lingual: Lingual
Permanent Maxillary Molar Lobes
2 Buccal: Mesiobuccal, Distobuccal and 2 Lingual: Mesiolingual, Distolingual
Permanent Mandibular First Molar Lobes
5 lobes named for the cusps with the addition of the distal lobe
Curve of Spee
Curves upwards from anterior to posterior
Curve of Wilson
The medio-lateral curve of the occlusal plane of posterior teeth
Maxillary Anterior Incisor Root Inclination
Maxillary Canine Root Inclination
Maxillary Molar Root Inclination
Mandibular Anterior Incisor Root Inclination
Mandibular Premolar Root Inclination
1PM Distolingual; 2 PM Distobuccal
Mandibular Molar Root Inclination
What is the shape of the teeth from the faciolingual direction?
Trapezoidal with the small on the bottom and big on top
What is the shape of the anterior teeth from the proximal view?
What is the shape of the Maxillary posterior teeth from the proximal view?
Trapezoidal with the big on the bottom and the small on top
What is the shape of the mandibular posterior teeth from the proximal view?
The open space between the proximal surfaces of two adjacent teeth in the same arch and are names according to their location; dependent on interproximal spaces
From the facial/lingual view: Incisal/Occlusal, Cervical/Gingival; From the Incisal/Occlusal view: Labial/Buccal, Lingual
What are the 2 physiological purposes for proper embrasure?
To serve as a spillway for food and an integral part of the self-cleaning of teeth
General Rules for Embrasure: Facial/Lingual Aspect
Incisal/Occlusal and Cervical/Gingival embrasures increase in size toward posterior
Rules for Embrasure: Incisal Aspect
Labial/Lingual embrasures are equal in size to anterior
Rules for Embrasure: Occlusal Aspect
Lingual embrasure is larger than buccal embrasure in posterior
Height of Contour/Crest of Curvature
The greatest area of contour inciso(occluso) cervically on the facial and lingual surfaces
Heights of Contour: Facial
Located in cervical third
Heights of Contour: Anterior Lingual
Located in the cervical third
Heights of Contour: Posterior
Located in the occlusal third
The imaginary line which marks the level of termination of the nonattached soft tissue surrounding the tooth
The actual attachment of the soft tissue of the mouth to the tooth
Depth of Curvature
Related to the widths and lengths of the crown and the location of the contact areas proximally
Rule for Cervical Line Contours
The facial/lingual CEJ curves apically and the mesial/distal CEJ toward incisal
Rule for Direction of Curvature
Greater on the mesial as compared to the distal
Rule for Depth of Curvature
Lines on adjacent proximal surfaces have the same depth of curvature; Greatest on central incisors and decreases posteriorly
Marginal Ridge Rule
The marginal ridge height of adjacent teeth should be the same; The shape should create a small occlusal/incisal embrasure
Central Groove Rule
The central grooves should form a continuous line on posterior teeth
The groove and ridge pattern on the masticating surface
Maxillary Molar Roots
Mandibular Molar Roots
Which tooth has the strongest root?
What is the most highly developed tooth?
Four or more lobes and only belong to primates
Sphere of Monson
3D combination of the Curve of Spee and Curve of Wilson
Mandibular Canine Root Inclination
Maxillary Premolar Root Inclination