failures of amalgam restoration
DESCRIPTION
CONSERVATIVE DENTISTRYTRANSCRIPT
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GOOD MORNING
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FAILURES OF AMALGAM RESTORATION
YASMIN MOIDIN 2008 BATCH
AL AZHAR DENTAL COLLEGETHODUPUZHA
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CONTENTS
• INTRODUCTION • SIGNS OF FAILURES OF AMALGAM
RESTORATION • REASONS FOR FAILURE OF ALAMGAM
RESTORATIONS
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INTRODUCTION
• Clinical failure is the point at which a restoration is no
longer serviceable or when the restoration poses
several risks it it is not replaced
• Most of these failures are due to iatrogenic factors
and can be avoided by careful attention to all details
during preparation and placement of the amalgam
restoration
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SIGNS OF FAILURE OF AMALGAM RESTORATION
• Fracture lines • Marginal ditching • Proximal overhang• Poor anatomic contours• Marginal ridge incompatibility• Improper proximal contacts• Recurrent caries
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• Amalgam blues• Voids• Bulk fracture of the tooth or amalgam • Poor occlusal contacts
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REASONS FOR FAILURE OF AMALGAM RESTORATIONS
• Improper case selection
• Improper cavity preparation
Inadequate extensions
Over extended cavity preparations
Shallow cavity preparations
Deep cavity preparations
Curved pulpal floor
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Wide isthmus
Narrow isthmus
Sharp axiopulpal line angle
Lack of butt joint at the cavosurface margins
Lack of occlusal convergence
Improper convenience form
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• Faulty selection and manipulation of amalgam
Selection of the alloy
Selection of the mercury
Improper trituration
Improper condensation
Contamination
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Over and under carving
Improper finishing
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• Errors in matricing procedures and restoration
Unstable matrixPoor contourAbsence of wedgePremature matrix material
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• Postoperative factors
Postoperative pain or sensitivity
Premature fracture
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Thank You !