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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
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
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 Maxillary posterior teeth from the proximal view?
Trapezoidal with the big on the bottom and the small on top
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
Height of Contour/Crest of Curvature
The greatest area of contour inciso(occluso) cervically on the facial and lingual surfaces
The imaginary line which marks the level of termination of the nonattached soft tissue surrounding 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 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
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