CONSERVATIVE DENTISTRY

1. GOOD
MORNING

2. FAILURES OF AMALGAM RESTORATION
YASMIN MOIDIN
2008 BATCH
AL AZHAR DENTAL COLLEGE
THODUPUZHA

3. CONTENTS
• INTRODUCTION
• SIGNS OF FAILURES OF AMALGAM
RESTORATION
• REASONS FOR FAILURE OF ALAMGAM
RESTORATIONS

4. 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

5. SIGNS OF FAILURE OF AMALGAM
RESTORATION
• Fracture lines
• Marginal ditching
• Proximal overhang
• Poor anatomic contours
• Marginal ridge incompatibility
• Improper proximal contacts
• Recurrent caries

6. • Amalgam blues
• Voids
• Bulk fracture of the tooth or amalgam
• Poor occlusal contacts

7. 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

8. Wide isthmus
Narrow isthmus
Sharp axiopulpal line angle
Lack of butt joint at the cavosurface margins
Lack of occlusal convergence
Improper convenience form

9. • Faulty selection and manipulation of amalgam
Selection of the alloy
Selection of the mercury
Improper trituration
Improper condensation
Contamination

10. Over and under carving
Improper finishing

11. • Errors in matricing procedures and restoration
Unstable matrix
Poor contour
Absence of wedge
Premature matrix material

12. • Postoperative factors
Postoperative pain or sensitivity
Premature fracture

13. Thank You !