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26 Cards in this Set
- Front
- Back
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T/F: The incisocervical dimension is greater than the mesiodistal dimension.
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TRUE - the incisocervical dimension is 1.5 times the mesiodistal dimension.
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What is the crown outline form of the Maxillary Central Incisor
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Square, square with a rounded gingival side, trapezoidal, rectangular, tapering, or ovoid.
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Describe the incisal edge of the Maxillary Central Incisor from the Facial View?
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Almost straight mesiodistally, but it tends to curve incisally near the center of the crown thus the greatest incisocervical length is in the CENTER.
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When are mamelons first visible?
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When the tooth first erupts
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Mamelons are remnants of the _____ ______.
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Labial Lobes
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Describe the relationship and dimensions between the mesial, middle, and distal mamelons?
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Mesial and Distal are = in mesiodistal length. The middle mamelon is narrower mesiodistally (because the central lobe was the smallest only occuping 1/4 of the mesiodistal dimension.
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Describe the mesioincisal angle of the Maxillary Central Incisor
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Relatively Sharp forming a right angle or sometimes an acute angle.
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The Mesial Outline form is
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Almost straight or only slightly convex
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Where is the mesial proximal contact located for the Maxillary Central Incisor
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Mesial Proximal Contact - incisal 1/3 of the crown near the mesioincisal angle.
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List other names for the mesial proximal contact
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Mesial height of contour, mesial proximal contact with adjacent angle, Area of greatest convexity on the mesial surface
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Describe the cervial line form
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Symmetric Apical Curve and a semicircular form
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The Distal Outline form is
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more convex/curved than the mesial outline. "bellies toward the lateral incisor"
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Where is the DISTAL proxmial contact located?
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- Located cervical to the mesial contact.
- 1/3 the distance from the incisal edge to the cervical line - Incisal third near the junction with the middle third |
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Describe the Distoincisal Angle and COMPARE it to the Mesioincisal Angle
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Distoincisal angle is more rounded than the mesioincisal angle. An obtuse angle is formed.
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Where are the facial developmental Depressions located? (aka labial developmental depression (line, grooves, labial lobe grooves)
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Closer to the mesiodistal center of the crown than to the mesial and distal outlines.
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What are Facial Heights of Contour Form?
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M-Shaped figure that represents portions of the facial surface that project the farthest facially.
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What are imbrication lines?
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Present in teh cervical 1/3 of the crown following the curvature of the cervical line.
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Where are imbrication lines common?
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Maxillary Incisors
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What are imbrication lines?
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Faint, curved lines that resemble the overlapping layers of roof tiles.
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T/F: The rooth length of the maxillary central incisor is longer than the crown
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TRUE- but there is disagrement.
Root is 2-3 mm longer Root is 1.5 - 2x the length of the crown Root is only slightly longer = GREAT VARIATION! |
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The cross-sectional rooth form is a __________ ___________.
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Rounded triangle. The root is cone shaped.
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T/F: The root apex of the Maxillary Central Incisor is sharp
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FALSE - the root apex is BLUNT.
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T/F: From the lingual view of the Maxillary Central Incisor you can see portions of the mesial and distal surfaces
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TRUE - this is due to lingual crown convergence since the crown tapers lingually
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Can you see the incisal ridge from the lingual view?
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NO
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What is another name for the incisal ridge of the Maxillary Central Incisor?
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Facioincisal or labioincisal line angle.
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what is the Incisal Edge on the lingual view of the Maxillary Central Incisor?
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Relatively FLAT surface between the facioincisal (labioincisal) and linguoincisal line angles.
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