Page 112 - My FlipBook

g6 THE TREATMENT OF TEETH

apart, it will be found impossible to press the
burnisher between them. Where this happens,
the filling is packed against the adjacent tooth
somewhat as if it were a matrix, and the filling is
completed. The occlusal part is trimmed with plug
finishing-burs, and the corners rounded with sand-
paper discs. The lateral and cervical edges are
firmly burnished, and trimmed with the Rhein
plug-trimmers. The lateral margins may also be
trimmed if sufficiently exposed with sandpaper
discs. A fine ribbon saw is then passed between
the teeth, and a fine polishing strip is forced
between them through the space made by the
saw, and as soon as it slips into the interproximal
space, it is freely drawn backwards and forwards in
order to perfect the surface of the filling. It may
be necessary to soap the polishing strip in order to
force it between the teeth. More strips are used
until the smoothing is completed, and orange-wood
sticks, trimmed to fine flat wedge-shaped ends,
may also be passed laterally into the interproximal
space, to perfect any depression at the cervical mar-
gins that are not reached with the strips. Finally
the burnisher may or may not be applied, as
thought good. It is found that the teeth
are slightly forced apart by the burnisher,
during the process of turning down the overlap