Maxillary Central Incisor Anatomy: The Importance Of The Cervical Line

Maxillary Central Incisor Anatomy: The Importance Of The Cervical Line

Question 1. Cervical line.
Answer:

• It is defined as a cementoenamel junction.
• It is a stable, anatomical demarcation.
• A curvature on the crowns at the cervical third above the cervical line, labially or buccally and lingually is observed.
• It is called cervicoenamel ridge/cervical ridge.
• It should not be over-contoured or under-contoured in full-crown restoration.

Question 2. Curve of Wilson
Answer:

• It is a curve that contacts the buccal and lingual cusp tips of the mandibular buccal teeth.
• It is mediolateral on each side of the arch and is due to the lingual inclination of mandibular posteriors The curve of Wilson is concave for mandibular teeth and convex for maxillary teeth.
• It is a cross-arch, cross-tooth curve and indicates the differences between supporting and non-supporting cusps in occlusion.

Question 3. Curve of Monson
Answer:

• Also called the lateral curve
• The curve of occlusion in which each cusp and incisal edge conforms to a segment of a sphere of 8 inches in diameter with its center in the region of the glabella.
• The curve usually does not exceed 5-10 degrees from the horizontal plane of orientation when viewed the frontal plane.
• It involves molar teeth and its concavity facing upwards