Podcast
Questions and Answers
The three geometric figures used to outline tooth crowns are trapezoid, triangular, and ______.
The three geometric figures used to outline tooth crowns are trapezoid, triangular, and ______.
rhomboid
In a trapezoid outline, the short side is cervically and the long side is ______.
In a trapezoid outline, the short side is cervically and the long side is ______.
incisally
One significance of the trapezoid outline is that it provides ______ between the teeth.
One significance of the trapezoid outline is that it provides ______ between the teeth.
contact
The base of a triangle outline is ______ and the apex is incisal.
The base of a triangle outline is ______ and the apex is incisal.
The proximal surfaces of maxillary posterior teeth typically have a ______ outline.
The proximal surfaces of maxillary posterior teeth typically have a ______ outline.
In the rhomboid outline, the occlusal surface is more ______ than the cervical.
In the rhomboid outline, the occlusal surface is more ______ than the cervical.
The outline that helps the tooth to be self-cleaning is the ______ shape.
The outline that helps the tooth to be self-cleaning is the ______ shape.
A key feature of the triangular outline is that it has a wide base, which adds ______ to the crown.
A key feature of the triangular outline is that it has a wide base, which adds ______ to the crown.
The rhomboid outline allows the crown to incline slightly ______ to the root bases.
The rhomboid outline allows the crown to incline slightly ______ to the root bases.
The proximal surfaces of anterior teeth typically have a ______ outline.
The proximal surfaces of anterior teeth typically have a ______ outline.
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Study Notes
Tooth Crown Outline
- The crown outline of teeth can be described using three geometric shapes: trapezoid, triangle, and rhomboid.
- These shapes are significant for their influence on tooth function and stability.
Trapezoid
-
Anterior Teeth (Labial/Buccal and Lingual Surfaces):
- Short side is cervical, long side is incisal/occlusal.
- Significance:
- Provides contact between teeth, stabilizing the dental arch and preventing food accumulation.
- Creates interproximal spaces for gingival tissue.
- Allows spacing between roots for supporting alveolar bone, periodontal ligament, and vascular/neural supply.
-
Posterior Teeth (Proximal Surface, Maxillary):
- Long side is cervical, short side is occlusal.
- Significance:
- Wide base adds strength to the crown.
- Constricted occlusal surface allows for efficient food penetration.
-
Posterior Teeth (Proximal Surface, Mandibular):
- Similar to maxillary posterior teeth but with a rhomboid shape:
- Constricted occlusal surface comparable to maxillary posterior teeth.
- Crown inclines slightly lingually to root base, facilitating proper occlusion with maxillary teeth.
- Long axes of upper and lower teeth are parallel, preventing cusp clash during function.
- Similar to maxillary posterior teeth but with a rhomboid shape:
Triangle
- Anterior Teeth (Proximal Surface):
- Base is cervical, apex is incisal.
- Significance:
- Wide base provides strength to the crown.
- Tapered labial/lingual outlines converging to the incisal ridges aid in food cutting.
Rhomboid
- Posterior Teeth (Proximal Surface of Mandibular Teeth):
- Explained in detail with the trapezoid outline for mandibular posterior teeth.
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