crown&bridge failures.ppt - Dr Huma Farid 1 2 Loss of pulp vitality Caries Movement of teeth Periodontal comprised teeth Relapsing orthodontic

crown&bridge failures.ppt - Dr Huma Farid 1 2 Loss of pulp...

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Dr Huma Farid 1
2
Loss of pulp vitality Caries Movement of teeth Periodontal comprised teeth Relapsing orthodontic treatment . 3
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Loss of retention: Dissolution of cement Generation of high forces with sticky food Lose retainer…. Bubbles appear on applying digital pressure on the lose retainer Minimal preparation design lose retention more commonly 6
Porcelain fracture: Failure of metal ceramic joint Thinner section of porcelain Failure of solder joint A flaw in the solder joint Failure to bond with the metal structure Solder joint not sufficiently large 7
Distortion Wash through pontic made too thin Too much force exertion during bridge removal Trauma Occlusal wear and perforation : Lost facing : Failure of porcelain and metal joint Acrylic or composite facing 8
Porcelain fracture 9
Porcelain facing lost 10
Underprescribed bridges Too less number of abutments selected for designed Too conservative in selection of retainers

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