AMALGAM |
 figure1 |
A
common failure in relation to a reasonably extensive amalgam
restoration that has been designed according to GV Black
principles is failure of a cusp. In this case it is apparent
that the buccal cusps are at risk. |
 figure2 |
The same tooth
photographed some years later showing that the cusps did
in fact fail as predicted. As it is an upper second molar
and aesthetics is not a problem the initial repair will be
in amalgam with a crown placed subsequently. |
| POSTERIOR
COMPOSITE RESIN |
|
|
 figure1 |
A relatively
minor GV Black Class II amalgam restoration has weakened
this upper first bicuspid and subsequently the buccal cusp
failed. |
 figure2 |
The old amalgam
has been removed and the cavity tidied up without extending
it any further than necessary. |
 figure3 |
The cavity
was conditioned then a short length of mylar strip was cut
to size and wrapped around to act as a matrix. |
 figure4 |
As soon as
the high strength, auto cure glass-ionomer was set it was
trimmed back to make room for the composite resin
and to expose and bevel the enamel margin. |
 figure5 |
After painting
the entire cavity with a low viscosity, unfilled, light activated
resin enamel bond the composite resin was placed incrementally
beginning at the distal and activating it through the lingual
cusp to draw the material on to the enamel. |
 figure6 |
The completed
restoration viewed from the occlusal. |
 figure7 |
The completed
restoration viewed from the buccal. Note that the ultimate
restoration will be a full porcelain crown. |
|
 figure1
|
There was a
small Site #2.2 composite resin restoration on the mesial
surface of this upper central incisor with a rather bizarre
lingual extension. The incisal corner failed necessitating
replacement of the entire restoration. |
 figure2 |
A view from
the lingual showing that a base of a resin modified glass-ionomer
has been placed to cover all exposed dentine. A resin modified
GIC was used because of the superior translucency and aesthetics
in an anterior tooth. |
 figure3 |
The enamel
margin has been bevelled and is now being acid etched for
15 seconds prior to placement of the composite resin. Because
the GIC is resin modified there is no need to etch it. |
 figure4 |
A lingual view
of the completed restoration. |
 figure5 |
The completed
restoration viewed from the labial |
