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The cervical ridge runs mesiodistally on the cervical third of the buccal surface of the crown. These are found on all primary teeth but only on the permanent molars. Cusp ridges are ridges that radiate from cusp tips. There are two marginal ridges, mesial and distal, present on all teeth.
CEJs differ from tooth to tooth in terms of their anatomy. The curvature of the CEJ is greatest on anterior teeth due to the narrow profile of these teeth. [6] On the anteriors, the distal aspect's curvature is usually one mm lower than the mesial aspect. Posterior teeth have flatter CEJ curvatures on the inter-proximal surfaces in comparison ...
Depicted by the cementoenamel junction, the cervical line is the border between the root and crown of a tooth. On the mesial and distal surfaces, the cervical line curves incisally, which is also seen in the permanent maxillary central incisor. [citation needed] The root of this tooth is cone-shaped with a rounded apex.
Compared to the tooth's mesial view of the cervical line, the distal cervical line is slightly more cervical by close to a millimeter. [15] There may be a developmental groove present for all or most of the length. [16] The distal view of the lateral incisor fits into the geometric shape of a triangle. [14]
The arrows point in the following directions: distal ←, mesial →, coronal ↑, apical ↓. Distal The direction toward the gingiva beyond the tooth furthest from the anterior midline (the 'most posterior tooth' or last tooth) in each quadrant of a dental arch, as opposed to mesial, which refers to the direction toward the anterior midline.
The rounded upper projections of the back teeth are cusps. The hard white exterior covering of the tooth is the enamel. As the tooth tapers below the gumline, the neck is formed. Below the neck, holding the tooth into the bone, is the root of the tooth. The inner portions of the tooth consist of the dentin, a bonelike tissue, and the pulp.
The mandibular central incisor is the tooth located on the jaw, adjacent to the midline of the face. It is mesial (toward the midline of the face) from both mandibular lateral incisors. As with all incisors, its function includes shearing or cutting food during mastication, commonly known as chewing. There are no cusps on the tooth. Instead ...
When follistatin, a BMP inhibitor, is over expressed in the epithelium of developing teeth, the ameloblasts do not differentiate and no enamel forms. Another example includes the conditional deletion of dicer-1 in the epithelium of developing teeth, which may cause impaired differentiation of ameloblasts resulting in deficient enamel formation.