Spectrophotometric analysis of crown discoloration induced by MTA- and
ZnOE-based sealers |
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Authors: | Konstantinos IOANNIDIS Ilias MISTAKIDIS Panagiotis BELTES Vassilis KARAGIANNIS |
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Institution: | 1. DDS, MSc, Specialist in Endodontics, London, United Kingdom.;2. DDS, MSc, Department of Basic Dental Sciences, School of Dentistry, Aristotle University of Thessaloniki, Greece. ;3. Professor, Department of Endodontology, School of Dentistry, Aristotle University of Thessaloniki, Greece.;4. PhD, Mathematician, Department of Mathematics, Aristotle University of Thessaloniki, Greece. |
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Abstract: | Crown discoloration can be induced by root canal sealer remnants following root canal
treatment.Objective:The aim of this study was to evaluate chromatic alterations in human tooth crowns
induced by a Mineral Trioxide Aggregate-based sealer (MTA Fillapex®
and a commonly used ZnOE-based sealer (Roth-811). The tested null hypothesis was
that the application of the materials did not induce clinically perceptible crown
discoloration (Ho: CIE color difference ΔE<3.7).Material and Methods:Forty five fully developed, intact, mandibular third molars were sectioned 1 mm
below the cemento-enamel junction. The pulp chambers were chemomechanically
debrided via the cervical access. The specimens were randomly assigned into three
groups Group 1: MTA Fillapex, Group 2: Roth 811, Group 3: Negative control
(unfilled) and immersed in individually marked vials containing distilled water up
to the cervix (37±1º C). The spectral reflectance lines were recorded by utilizing
a UV-VIS spectrophotometer equipped with integration sphere in the visual spectrum
at baseline, 1 week, 1 and 3 months after material placement. Data were
transformed into values of the CIE L*a*b* color system and the corresponding ΔE
values were calculated. Statistical analysis was performed using two-way mixed
ANOVA models, at p=0.05 level of significance. Results:A statistically significant increase in a* and b* chromatic parameters of the MTA
Fillapex Group was measured. However, ΔE values did not exceed the human eye
perceptibility threshold (set at ΔE<3.7) during the experimental period
(ΔEt3=2.88). In Roth-811 Group, a statistically significant decrease in L* and a
statistically significant increase in a* and b* chromatic parameters was measured,
during all observation periods. Resultant ΔE values exceeded the human eye
perceptibility threshold after 1 week (ΔEt1=5.65).Conclusions:Application of MTA Fillapex in tooth crowns resulted in minimal color alterations,
while Roth 811 induced severe discoloration, in vitro. It could
be suggested that, in terms of aesthetics, the use of MTA Fillapex appears to be
favorable. |
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Keywords: | CIE color system Discoloration MTA Fillapex Root canal sealer Roth 811 Spectrophometry |
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