Polarised LM of a cracked ceramic dental crown

Polarised LM of a cracked ceramic dental crown

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This image is part of the feature Dental Technology

Credit: VOLKER STEGER/SCIENCE PHOTO LIBRARY

Caption: Dental crown. Polarised light micrograph (PLM) of a longitudinal section through a cracked dental crown made of metal (multicoloured) and ceramic (above metal). If the top of a tooth is badly cracked, decayed or broken, it must be replaced by an artificial crown. The remaining undamaged part of the tooth is cut down to a peg to receive the hollow crown. This crown is then shaped to form a replica of the original tooth and cemented in place. Here the crown has cracked during firing in a dental furnace. This is because the ceramic and metal parts of the crown have different rates of expansion. New dental ceramics must overcome this problem. Magnification: x20 at 5x7cm size.

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Keywords: ceramic, ceramic crown, condition, cracked, cracked dental crown, crown, dental, dental crown, dentistry, disorder, healthcare, light micrograph, medical, medicine, metal, odontology, oral, plm

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