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RESTORATION-Bar-borne dentures
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There are two types of bar available for bar-borne restorations. The
first is Dolder Bar which has an egg shaped profile and the second is a
Round Bar.
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The planning and pre-operative work is once again all important.
A common problem occurs when we are sent impressions with the
implants in place but without any knowledge of the position or shape
of the teeth. A golden rule is that the bar should be made to the
parameters of the denture and not the other way round. Therefore
all aspects of the bite, design and aesthetics should be thoroughly
worked out before placing the implants.
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A try-in is produced for this reason, it not only assists with the
planning of placement for the implants, but it can make sure that
the height and width of the denture can accommodate the bar structure.
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Even if the ridge varies in height when the bar is constructed it must
be kept horizontal. Allowing the bar to slope creates problems with
the horizontal forces and would impede the function of the bar
attachment. The bar is cut to the correct measurement and carefully
soldered to the gold copings. Small extensions can be placed distally
to the abutments but this is not suitable for all cases.
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The bar will be returned to the surgery for a
try-in before transferring the wax-up. The bar
matrix or riders will be placed to allow for the
absorption of the horizontal forces. Care must
be taken that the positioning is right to ensure
correct function.
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After a successful try-in the denture can be
finished and the matrix processed into the
denture.
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