failures of amalgam restoration
DESCRIPTION
CONSERVATIVE DENTISTRYTRANSCRIPT
GOOD MORNING
FAILURES OF AMALGAM RESTORATION
YASMIN MOIDIN 2008 BATCH
AL AZHAR DENTAL COLLEGETHODUPUZHA
CONTENTS
• INTRODUCTION • SIGNS OF FAILURES OF AMALGAM
RESTORATION • REASONS FOR FAILURE OF ALAMGAM
RESTORATIONS
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
SIGNS OF FAILURE OF AMALGAM RESTORATION
• Fracture lines • Marginal ditching • Proximal overhang• Poor anatomic contours• Marginal ridge incompatibility• Improper proximal contacts• Recurrent caries
• Amalgam blues• Voids• Bulk fracture of the tooth or amalgam • Poor occlusal contacts
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
Wide isthmus
Narrow isthmus
Sharp axiopulpal line angle
Lack of butt joint at the cavosurface margins
Lack of occlusal convergence
Improper convenience form
• Faulty selection and manipulation of amalgam
Selection of the alloy
Selection of the mercury
Improper trituration
Improper condensation
Contamination
Over and under carving
Improper finishing
• Errors in matricing procedures and restoration
Unstable matrixPoor contourAbsence of wedgePremature matrix material
• Postoperative factors
Postoperative pain or sensitivity
Premature fracture
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