by Dr. Fred Peck, DDS
21. August 2011 17:12
Porcelain veneers are very strong when placed on top of a stable foundation and bite forces are controlled. Porcelain is weak when forces are placed sideways. The first important aspect to controll forces prior to placing veneers is to be sure the bite is correct and balanced. Chewing and grinding forces must be equally distributed on all teeth and not just hitting on one tooth. Hitting or grinding on one tooth especially from a sideways pressure can cause the porcelain to crack.
The other important aspect to consider to prevent fracture is the foundation under the porcelain. If enamel is present, the tooth is strong and will not flex sideways. As more enamel is removed during the preparation phase, the tooth becomes more flexible. If too much enamel is removed during the preparation and the porcelain veener sits on top of dentin (the layer below enamel), the porcelain will bend on top. Porcelain is glass and glass will not bend, but only break. Therefore if the tooth is not stable and bend, the porclain will break away from the cement and fracture. These are the two main reasons why porcelain venners can fail. Your dentist can decided what is best for each patient and take into account other situations to ensure longevity of porcelain veneers.
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