不同浓度过氧化氢美白牙膏的效果：渗透到牙髓腔和颜色变化。

Effect of whitening toothpastes with different hydrogen peroxide concentrations: Penetration into the pulp chamber and color change.

机构信息

Department of Restorative Dentistry, Federal University of Paraíba, João Pessoa, Paraíba, Brazil.

Department of Restorative Dentistry, State University of Ponta Grossa, Uvaranas, Ponta Grossa, Paraná, Brazil.

出版信息

J Dent. 2024 May;144:104951. doi: 10.1016/j.jdent.2024.104951. Epub 2024 Mar 19.

DOI:10.1016/j.jdent.2024.104951

PMID:38508441

Abstract

OBJECTIVES

This study evaluated the efficacy of simulated brushing with toothpastes containing different concentrations of hydrogen peroxide (HP) in pulp chamber penetration and color change. Also, physical-chemical properties (concentration, pH and viscosity) were evaluated.

METHODS

Forty-nine premolars were divided into seven groups (n = 7): untreated (control); whitening gel (White Class 6 %, 6 %BG) with one 90  min application (6 %BG 90  min) and 14 applications of 90  min (6 %BG 14×90 min); toothpastes (Colgate Luminous White Glow 3 %, 3 %TP; Crest 3D White Brilliance 4 %, 4 %TP; Colgate Optic White Pro-Series 5 %, 5 %TP) and 6 %BG toothbrushing for 14 applications of 90 s. HP penetration into the pulp chamber was measured through UV-Vis spectrophotometry and color change with a spectrophotometer (ΔE, ΔE, and ΔWI). Initial concentration, pH, and viscosity were measured through Titration, Digital pH-meter, and Rheometer, respectively. Statistical analysis used one-way ANOVA and Tukey's test (α = 0.05).

RESULTS

6 %BG (14×90 min) and 4 %TP groups showed acidic pH and higher concentrations of HP in the pulp chamber compared to the other groups (p < 0.05). On the other side, 3 %TP and 5 %TP groups showed alkaline pH, higher viscosity between the toothpastes and lower HP penetration (p < 0.05). The 6 %BG AH (14×90 min) group exhibited the most significant color change (ΔE, ΔE, and ΔWI) (p < 0.05).

CONCLUSIONS

Brushing with whitening toothpaste with an acidic pH leads to greater HP penetration into pulp chamber; but, even when a high concentrated HP whitening toothpaste was used, a lower whitening effect was observed when compared to a two-week at-home bleaching.

CLINICAL SIGNIFICANCE

Whitening toothpastes containing up to 5 % HP produced lower whitening effect than two-week at-home bleaching. Additionally, HP was detected within the pulp chamber which can potentially impact in tooth sensitivity.

摘要

目的

本研究评估了含不同浓度过氧化氢（HP）的牙膏模拟刷牙对牙髓腔内渗透和颜色变化的疗效。同时，还评估了物理化学性质（浓度、pH 值和粘度）。

方法

将 49 颗前磨牙分为 7 组（n=7）：未处理（对照）；使用一次 90 分钟的美白凝胶（White Class 6%，6%BG）（6%BG 90 分钟）和 14 次 90 分钟应用（6%BG 14×90 分钟）；牙膏（高露洁亮白净光 3%，3%TP；佳洁士 3D 美白炫亮 4%，4%TP；高露洁 Optic White Pro-Series 5%，5%TP）和 6%BG 牙刷刷牙 14 次，每次 90 秒。通过紫外可见分光光度法测量 HP 对牙髓腔的渗透，通过分光光度计测量颜色变化（ΔE、ΔE 和 ΔWI）。通过滴定、数字 pH 计和流变仪分别测量初始浓度、pH 值和粘度。采用单因素方差分析和 Tukey 检验（α=0.05）进行统计学分析。

结果

与其他组相比，6%BG（14×90 分钟）和 4%TP 组的牙髓腔内显示出酸性 pH 值和更高浓度的 HP（p<0.05）。另一方面，3%TP 和 5%TP 组的 pH 值呈碱性，牙膏之间的粘度较高，HP 渗透较低（p<0.05）。6%BG AH（14×90 分钟）组显示出最显著的颜色变化（ΔE、ΔE 和 ΔWI）（p<0.05）。