Dental Materials
Volume 29, Issue 1 , Pages 59-84, January 2013
Abstract
Dental adhesive systems should provide a variety of
capabilities, such as bonding of artificial materials to dentin and
enamel, sealing of dentinal tubules, reduction of post-operative
sensitivity and marginal sealing to reduce marginal staining and caries.
In the laboratory, numerous surrogate parameters that should predict
the performance of different materials, material combinations and
operative techniques are assessed. These surrogate parameters include
bond strength tests of various kinds, evaluation of microleakage with
tracer penetration between restorative and tooth, two-dimensional
analysis of marginal quality with microscopes and mapping of the
micromorphology of the bonding interface. Many of these tests are not
systematically validated and show therefore different results between
different research institutes. The correlation with clinical phenomena
has only partly been established to date. There is some evidence, that
macrotensile and microtensile bond strength tests correlate better with
clinical retention of cervical restorations than macroshear and
microshear bond tests but only if data from different test institutes
are pooled. Also there is some evidence that marginal adaptation has a
moderate correlation in cervical restorations with clinical retention
and in Class II restorations (proximal enamel) with clinical marginal
staining. There is moderate evidence that microleakage tests with dye
penetration does not correlate with any of the clinical parameters
(post-operative hypersensitivity, retention, marginal staining). A
rationale which helps the researcher to select and apply clinically
relevant test methods in the laboratory is presented in the paper.
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