Clinical effects of dehydration on tooth color: How much and how long?

Hatırlı, Hüseyin; Karaarslan, Emine Şirin; Yaşa, Bilal; Kılıç, Enes; Yaylacı, Ayla

doi:10.1111/jerd.12612

“…In addition, for ethical reasons, it was not possible to leave the control group untreated, so both groups had to receive treatment in this trial. Furthermore, T1 was not performed on the day of treatment, but the following day to avoid color changes caused by tooth isolation and subsequent dehydration [ 43 , 44 ]. A further limitation is the lack of data after debonding to evaluate the treatment outcome in the area around the bracket.…”

Section: Discussionmentioning

confidence: 99%

Resin infiltration versus fluoride varnish for visual improvement of white spot lesions during multibracket treatment. A randomized-controlled clinical trial

Kashash,

Hein,

Göstemeyer

et al. 2024

Clin Oral Invest

3

0

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Aims This study aimed to evaluate the visual improvement of resin infiltration of white spot lesions (WSL) during orthodontic treatment with the multibracket appliance (MBA) compared to fluoride varnish. Methods Patients aged 12–17 years with at least one WSL with an International Caries Detection and Assessment System (ICDAS) score of 1–2 during an active MBA treatment were included and randomized to receive either resin infiltration (Icon) or fluoride application (Flairesse). Standardized digital images were obtained before, one-day, one-week, one-month, three-months and six-months after treatment using a DSLR camera and a matching polarization filter. A grey reference card was used for color standardization. A Matlab routine was used to measure the color difference between adjacent healthy enamel and treated WSL. The independent-samples t-test was used for intergroup and paired-samples t-test for intragroup comparison. Results Images of 116 teeth from 36 patients were analyzed. The ΔE for the “Icon” treated WSL was smaller (T1ICON = 5.0 ± 1.4) than in the fluoride group (T1Fluoride = 8.4 ± 3.2). Caries infiltration significantly improved the aesthetic appearance of WSL (p < 0.001), which remained satisfactory at six months (T5ICON = 5.2 ± 1.6). Conclusion WSL infiltration management during orthodontic treatment was superior to topical fluoridation in not only arresting the enamel lesions but also significantly improving the aesthetic appearance of demineralized regions around the brackets. Clinical relevance WSL treatment in orthodontic patients is usually initiated after debonding. Research has shown that the earlier WSL is treated, the better the aesthetic outcome. There is limited data on the efficacy of resin infiltration of WSL during orthodontic treatment.

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“…For instance, no fluoride was added to the toothpaste slurries to avoid interaction between fluoride and HAP. Tooth dehydration could decrease enamel translucency and increase luminosity, making the tooth falsely appear whiter [ 38 , 39 ]. Compared with previous studies [ 17 , 18 , 27 ], in which the samples were air-dried before the color measurement, we measured the tooth color in a liquid environment, which could avoid the interference of dehydration in tooth color assessment.…”

Section: Discussionmentioning

confidence: 99%

Tooth whitening with an experimental toothpaste containing hydroxyapatite nanoparticles

Shang

¹

,

Kaisarly

²

,

Kunzelmann

³

2022

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Background The aim of this study was to evaluate the postbrushing tooth-whitening effect of toothpaste containing hydroxyapatite nanoparticles (nano-HAPs). The impact of the concentration on the whitening performance of nano-HAP toothpaste was also investigated. Methods Two concentrations of nano-HAP (10 wt% and 1 wt%) were incorporated in nonabrasive toothpastes. Forty bovine incisors were randomly assigned into four groups: 10 wt% nano-HAP, 1 wt% nano-HAP, toothpaste without nano-HAP as a negative control and water as a blank control. Each tooth was treated with the toothpaste three times and hydrodynamic shear force (HSF) once. The teeth surfaces were observed by SEM after each application. Tooth color (L*, a* and b* values) was measured by a spectrophotometer, and color changes (△E, △L, △a and △b values) were calculated. Two-way mixed ANOVA was performed to evaluate the influence of the concentration and repeated application on the tooth-whitening effect of nano-HAP. Results We found that nano-HAP-treated enamel exhibited higher L* values and lower a* and b* values than the control groups (P < 0.05). The 10 wt% nano-HAP group showed significantly higher △E values than the 1 wt% nano-HAP group (P < 0.05). After three applications, the △E mean value of the 10 wt% nano-HAP group was 4.47. The △E and △L values were slightly reduced after HSF (P < 0.05). For both nano-HAP groups, HAP single crystallites and agglomerates were identified, and their sizes grew with nano-HAP reapplication. Conclusions In conclusion, nano-HAP toothpaste has a satisfying postbrushing whitening effect and good resistance to mechanical forces. The whitening effect seemed to be concentration-dependent.

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“…Visual judgements were performed according to the 2-min rule, to avoid the impact of dental dehydration on in vivo dental color [ 24 ]. In addition, participants were required to avoid any contact of the tongue with the target teeth, in order to prevent color changes due to dental rehydration [ 25 ].…”

Section: Methodsmentioning

confidence: 99%

Visual and instrumental coverage error of two dental shade guides: an in vivo study

Ruiz‐López

¹

,

Pérez

²

,

Lucena

³

et al. 2022

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Objectives This study aims to evaluate in vivo the color agreement between natural teeth and dental shade guides by means of visual and instrumental coverage error ($$\mathrm{CE}$$ CE ) index. Materials and methods The color of the middle third of 735 incisors was visually determined by two evaluators using the Vita Classical (VC) and Vita 3D Master (V3DM) shade guides. The color match between the natural tooth and the shade tab was rated as poor (P), good (G), or optimum (O) by each observer. CIE color coordinates of the target teeth and shade tabs of VC and V3DM were instrumentally measured using a clinical spectrophotometer. Visual ($${\mathrm{CE}}_{\mathrm{V}}$$ CE V ) and instrumental ($${\mathrm{CE}}_{\mathrm{I}}$$ CE I ) coverage error indexes were computed using CIELAB and CIEDE2000 metrics for both shade guides. For $${\mathrm{CE}}_{\mathrm{V}}$$ CE V calculation, only the concordant inter-observer determination on tooth shade rated as O–O or O–G was used. The results were evaluated using perceptibility (PT, $${\mathrm{\Delta E}}_{\mathrm{ab}}^{*}$$ Δ E ab ∗ = 1.2, $${\mathrm{\Delta E}}_{00}$$ Δ E 00 = 0.8) and acceptability (AT, $${\mathrm{\Delta E}}_{\mathrm{ab}}^{*}$$ Δ E ab ∗ = 2.7, $${\mathrm{\Delta E}}_{00}$$ Δ E 00 = 1.8) color thresholds for dentistry. Results VC and V3DM exhibited $${\mathrm{CE}}_{\mathrm{I}}$$ CE I (2.5, 3.2, and 3.2, 2.7 CIELAB units; 1.9, 2.3, and 2.8, 2.4 CIEDE2000 units, respectively, for O–O and O–G match) and $${\mathrm{CE}}_{\mathrm{V}}$$ CE V (4.7, 4.8, and 4.1, 4.6 CIELAB units; 3.3, 3.4, and 3.4, 3.6 CIEDE2000 units, respectively, for O–O and O–G match) values greater than 50:50% AT for both color difference formulas. $${\mathrm{CE}}_{\mathrm{I}}$$ CE I contributes more than 50% (53.2–82.4% range) to the $${\mathrm{CE}}_{\mathrm{V}}$$ CE V value. This contribution depends on the shade guide used and the quality of the visual rating. Conclusions The evaluated shade guides exhibited visual coverage errors above acceptability thresholds, largely due to the contribution of the instrumental coverage error to the visual coverage error. Clinical relevance It necessary to further improve commercially available dental shade guides to facilitate achievement of satisfactory esthetics results in clinical practice.

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Clinical effects of dehydration on tooth color: How much and how long?

Cited by 19 publications

References 19 publications

Resin infiltration versus fluoride varnish for visual improvement of white spot lesions during multibracket treatment. A randomized-controlled clinical trial

Resin infiltration versus fluoride varnish for visual improvement of white spot lesions during multibracket treatment. A randomized-controlled clinical trial

Tooth whitening with an experimental toothpaste containing hydroxyapatite nanoparticles

Visual and instrumental coverage error of two dental shade guides: an in vivo study

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