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This can happen from trauma such as a fall where the teeth are impacted by a hard object causing a chip to occur. Enamel fracture of tooth 11 on the incisal, biting, surface. The term “craze lines” and "enamel infraction" are also used to describe minute incomplete cracks exclusive to the enamel surface.
Brownish lines, the striae of Retzius, develop as a result of a change in the growth process. Macroscopically, these lines can be seen on the labial surface or lip side of anterior or front teeth as horizontal lines on the tooth crown , also known as perikymata or "imbrication lines" .
grinding of teeth and a bad habit of chewing on things, such as pencils, pens, etc.; due to stresses caused by the seal. Expansion over time of the silver amalgam creates stress in the body of the dental unit. This process contributes to chipping and even deep longitudinal cracking, up to and including breaking the tooth in half.
Perikymata (Greek plural of περικύμα, perikyma) are incremental growth lines that appear on the surface of tooth enamel as a series of linear grooves. [1] In anatomically modern humans, each perikyma takes approximately 6–12 days to form. Thus, the count of perikymata may be used to assess how long a tooth crown took to form.
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This process, known as craze fibril breakdown, is closely linked to the active zone and craze growth at the craze interface. [35] The breakdown of the craze starts gradually as voids coalesce to produce a cavity equal in thickness to the craze itself. Craze breakdown, which leads to crack extension, is crucial to the failure process.
Johnny Depp’s teeth were branded ‘rotten’ at Cannes in 2023 (Getty Images) In the video, Depp can be seen acknowledging a painting of his Pirates of the Caribbean character.
According to the two morticians, who prepared Marilyn for burial, the legendary sex symbol had hairy legs, false teeth, and purple blotches all over her face when she was found dead aged 36 in 1962.