crown
A scratch on a diamond is known as an abrasion. It refers to a visible mark or line on the surface of the diamond that is caused by wear or damage. Abrasions can affect the diamond's clarity and overall appearance.
The straight line clouds are called "cirrus clouds."
The line where gravity becomes negligible or zero is typically referred to as the Karman line, which is located approximately 62 miles (100 kilometers) above sea level in Earth's atmosphere. Beyond this point, the effects of gravity are minimal, and objects experience microgravity or weightlessness.
Visible light travels in a straight line unless it encounters obstacles or mediums that cause it to bend or scatter.
If the wavelength decreases, the spectral line moves towards the blue end of the visible light spectrum. This phenomenon is known as blue shift, indicating that the object is moving towards Earth.
The part of a tooth that is exposed and above the gum is called "crown", not to confuse with a crown that is prothesis to restore a heavily damaged tooth. The part of a tooth that is hidden inside the bone is called "root".
The anatomical root refers to the part of a tooth that is embedded in the jawbone. The clinical root is the part of the tooth that is visible and extends above the gum line. Together, the anatomical and clinical roots provide stability to the tooth and support the surrounding structures.
The main sections of a tooth are the crown, neck, and root. The crown is the visible part above the gum line, the neck is the area where the crown meets the root, and the root anchors the tooth into the jawbone. Additionally, the tooth contains layers such as enamel, dentin, and pulp, which play crucial roles in its structure and function.
The tooth root is the part of the tooth that is embedded within the jawbone and anchors the tooth in place. It is located beneath the gum line and connects to the crown of the tooth, which is the visible part in the mouth.
Gingival pertains to the gums. supragingival pertains to the tooth surface above the gum line, and subgingival pertains to the tooth surface below the gum line or neck of the tooth.
The line above the total is called the subtotal. It is referred to as above-the-line. It does not include deductions or taxes.
The line on a mountain above which trees do not grow is called the tree line. It is sometimes called the timber line as well.
The teeth in animals grow by eruption - the tooth is fully formed in the jaw and over the animal's life it is slowly forced out of the jaw where it is visible above the gum line. This is why very old animals may be missing some or all of their teeth - the entire tooth has been used and has fallen out of the socket.
Your teeth are fixed to your jawbone in your mouth. They sit in a curved line along your top and bottom jaws. The white part of your tooth that you can see when you smile or open your mouth is called the crown. Some of your tooth is hidden under the skin (gum) in your mouth. This is called the root and you cannot see this in your mouth. The white covering on your tooth is called enamel. Dental enamel is strong and helps to protect the tooth. Dental enamel is the hardest thing in your whole body.For further information, go to The British Dental Health Foundation link.
Dentin is a living tissue found beneath the enamel of a tooth. It consists of tiny tubules that extend from the inner pulp of the tooth to the outer enamel layer, helping to transmit sensations such as temperature and pressure.
The imaginary line that travels vertically through the center of the tooth is called the long axis or the root axis. It represents the direction in which the tooth is oriented within the jawbone.
It is called a Vírgula