failures of amalgam restoration

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

Thank You !