AMERICAN JOURNAL OF DENTISTRY
·
2024
·Vol. 37
·期 1
·3-8
·
IF 0.9
Soyeon Kim,Yeon-Jee Yoo,Franklin Garcia-Godoy,Young-Seok Park
Purpose: To evaluate the effectiveness of whitening toothpaste in restoring tooth color after coffee staining and its potential impact on enamel surfaces compared with regular toothpaste. Methods: Bovine tooth enamel specimens were prepared and stained with coffee solutions before undergoing brushing simulation with different toothpaste slurries (whitening, regular, reference). For precise evaluation, spectrophotometric measurements were taken at intervals to assess color changes using the CIELAB (Commission Internationale de l'Éclairage Lab*) color space. Additionally, profilometric measurements were taken to determine the impact of toothpaste type on the roughness and abraded depth of the enamel surface. To understand the effects of toothpaste and brushing on color change, surface roughness, and abraded depth, while also considering correlations between these factors, the findings were analyzed using mixed-effects models. Results: The whitening toothpaste group demonstrated the highest recovery rate (71%) after 10,000 brushstrokes, followed by the regular toothpaste group (48%) and the reference slurry group (43%). The mixed-effects model analysis revealed that the reference group had a smaller change in lightness (ΔL) than those in the regular toothpaste group. The whitening toothpaste group showed a greater change in lightness on average than those in the regular toothpaste group, with an increase in lightness as the number of brushstrokes increased. According to the roughness and abraded depth data, the whitening toothpaste group was least affected by brushing, while the reference and regular toothpaste groups showed higher levels of roughness and abraded depth at all intervals. Clinical significance: Gaining a thorough understanding of the effectiveness of whitening toothpaste and its impact on the enamel surface plays a crucial role in refining toothpaste formulations and advancing tooth whitening techniques in dental care.
研究领域:
口腔医学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Jiatian Song,Fei Bian,Xinhua Li,Zhuoqun Li,Shaorui He,Linmao Jia,Zhaopeng Xu
Photonic crystal (PC) films have been widely applied in color displays and the anticounterfeiting field due to their facile fabrication process and easily tunable properties. However, the method for improving the reusability of the color-changed swollen PC films is still a challenge. In this paper, we report the color recovery behavior of epoxy resin inverse opal photonic crystal (EP-IOPC) films, which show different responses after being infiltrated with ethanol, acetone, and dimethyl sulfoxide (DMSO) based on the swelling and deswelling process. DMSO achieved the best effect on the color recovery of the swollen EP-IOPC films compared to ethanol and acetone, and the reflection spectrum blue-shifted in a small range and finally stabilized at a 60 nm deviation from the original spectrum after 10 times recovery. This strategy of color recovery not only solved the problem that the swollen EP-IOPC film’s color changes to a certain extent but also showed promising potential in the color display and anticounterfeiting field.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bingying Gao,Jinyao Cao,Chao Yao,Linqiang Mao
Advanced aerogel materials with lightweight, flame retardant, and rapid cooling properties are urgently needed as thermal insulators in harsh environments. Herein, Cr 2 O 3 − Al 2 O 3 aerogels (CrAAs) were fabricated through a simple method and an ambient pressure drying process. A large number of pores were produced in the microstructure of the sample by the carbonization of soluble starch during calcination. The porous structure decreases the density of the prepared CrAA (Cr 2 O 3 − Al 2 O 3 aerogel) to as low as 0.143 g cm −3 , and increases the thermal conductivity to as high as 0.125 W m −1 K −1 , indicating the good thermal dissipation and rapid cooling performance of the sample. The prepared CrAAs possess a variety of composite properties such as good flame retardancy, rapid cooling, and colour restore after flame is extinguished. Moreover, after being subjected to flame treatment at ∼ 1300 °C using a butane blowtorch for 5 min, the CrAAs can be rapidly cooled to about 39.2 °C in about 1–2 min. The mechanism of the rapid cooling property was herein analysed, and we anticipate the potential application of CrAAs in flame–retardant cooling coatings.
研究领域:
材料科学
·
热工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2022
·
IF 1.193
Yan-Qi LI,Chang-Xin HUANGFU,Lan-Xiu NI,Liang FENG
In this work, a novel colorimetric sensor array based on ratiometric indicator-displacement assay has been developed for the recognition and semi-quantitative detection of tetracycline, oxytetracycline, chlortetracycline, and doxycycline. The sensor array was fabricated by various combinations of 5 indicators and 3 metal cations. Based on the difference of complex stability constant, the competitive binding between metal cations with tetracyclines and indicators resulted in different color recovery of indicators through indicator-displacement reaction. By adjusting the concentrations of metal cations, the discrimination of tetracyclines has been achieved on as-fabricated sensor array and the lowest concentration for discrimination of tetracyclines could be 1 μmol/L, which was similar to those sensor arrays based on fluorescent nanomaterials. Meanwhile, the color difference between tetracyclines has been further enlarged by color overlaying of complexes of tetracyclines and metal cations, which enriched the distinguish capability of the sensor array and promised the discrimination ability for tetracyclines with various concentrations. Hierarchical clustering analysis (HCA) and principal component analysis (PCA) demonstrated that the colorimetric sensor array has an excellent capability to discriminate tetracyclines at different concentrations from potential interferants. The detection range for tetracyclines was 1–50 μmol/L and the limit of recognition for tetracyclines was 1 μmol/L with the colorimetric sensor array. Finally, this colorimetric sensor array was successfully applied for tetracyclines differentiation in real samples.
研究领域:
分析化学
·
传感器技术
·
药物分析
·
比色测定
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）