Reproducibility of electrical caries measurements: A technical problem?
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vor 19 Jahren
The currently available instrument for electrical detection of
occlusal caries lesions {[}Electronic Caries Monitor (ECM)] uses a
site-specific measurement with co-axial air drying. The
reproducibility of this method has been reported to be fair to
good. It was noticed that the measurement variation of this
technique appeared to be non-random. It was the aim of this study
to analyse how such a non-random reproducibility pattern arises and
whether it could be observed for other operators and ECM models.
Analysis of hypothetical measurement pairs showed that the pattern
was related to measurements at the high and low end of the
measurement range for the instrument. Data sets supplied by other
researchers to a varying degree showed signs of a similar
non-random pattern. These data sets were acquired at different
locations, by different operators and using 3 different ECM models.
The frequency distribution of measurements in all cases showed a
single or double end-peaked distribution shape. It was concluded
that the pattern was a general feature of the measurement method.
It was tentatively attributed to several characteristics such as a
high value censoring, insufficient probe contact and unpredictable
probe contact. A different measurement technique, with an improved
probe contact, appears to be advisable. Copyright (C) 2005 S.
Karger AG, Basel.
occlusal caries lesions {[}Electronic Caries Monitor (ECM)] uses a
site-specific measurement with co-axial air drying. The
reproducibility of this method has been reported to be fair to
good. It was noticed that the measurement variation of this
technique appeared to be non-random. It was the aim of this study
to analyse how such a non-random reproducibility pattern arises and
whether it could be observed for other operators and ECM models.
Analysis of hypothetical measurement pairs showed that the pattern
was related to measurements at the high and low end of the
measurement range for the instrument. Data sets supplied by other
researchers to a varying degree showed signs of a similar
non-random pattern. These data sets were acquired at different
locations, by different operators and using 3 different ECM models.
The frequency distribution of measurements in all cases showed a
single or double end-peaked distribution shape. It was concluded
that the pattern was a general feature of the measurement method.
It was tentatively attributed to several characteristics such as a
high value censoring, insufficient probe contact and unpredictable
probe contact. A different measurement technique, with an improved
probe contact, appears to be advisable. Copyright (C) 2005 S.
Karger AG, Basel.
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