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In vivo and in vitro spectrophotometric evaluation of upper central incisors before and after extraction

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Abstract

Objectives

This in vivo and in vitro study investigated the influence of pulpal vitality on the optical properties of teeth over a 1-month period.

Materials and methods

We monitored two specific areas (2-mm-thick pure enamel and 3-mm-thick enamel–dentine complex) in 10 teeth against two backgrounds (white and black) using a calibrated reflectance spectrophotometer at the following time points: before extraction (T0); immediately after extraction (T1); at 1-day post-extraction (T2); at 1-week post-extraction (T3); and 1-month post-extraction (T4). We recorded tooth colour based on the Commission Internationale d’Eclairage L*a*b* model and translucency and analysed these characteristics over time using analysis of variance.

Results

The 2-mm-thick pure enamel area showed significant changes (p > 0.05) in L*, a* and b* values between before and 1 month after extraction (T0–T4). Translucency was detectable between (T0–T3) and (T0–T4). The 3-mm-thick enamel–dentine complex also exhibited significant differences (p > 0.05) in L*, a* and b* values within (T0–T4). Translucency value changes significantly (p > 0.05) within the first day (T0–T2) and (T0–T3). CIEDE 2000 DE values revealed no statistically significant differences (p < 0.05) in colour between the T0 L*a*b* measures and all the subsequent measures at times T1, T2, T3 and T4.

Conclusions

Within the limitations of this study, we conclude that the optical characteristics (i.e. colour and translucency) of teeth change after extraction.

Clinical relevance

The results help understanding the precise moment when the colour of extracted tooth changes to identify optimum time to use a tooth for scientific investigation and determine whether it is necessary to extract pulp tissue beforehand.

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Correspondence to Juan R Mayoral.

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The authors declare that they have no conflict of interest.

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No funding was received for these investigations.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Soler, E., Duran-Sindreu, F., Basilio, J. et al. In vivo and in vitro spectrophotometric evaluation of upper central incisors before and after extraction. Clin Oral Invest 21, 2429–2436 (2017). https://doi.org/10.1007/s00784-016-2039-1

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  • DOI: https://doi.org/10.1007/s00784-016-2039-1

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