牙膏去除外源性色斑功效评价方法的标准化研究

doi:10.3969/j.issn.2097-2806.2023.09.015

Abstract

Abstract:

A standardized in vitro method was established to evaluate the efficacy of toothpaste in extrinsic stain removal. Using bovine incisors as substrates and L^*a^*b^* color space as tooth color evaluating system, the removal effects of toothpaste samples on extrinsic stains were determined through the process of dyeing-brushing-testing. The critical parameters of the method were systematically optimized. A standardized method was established in which an L8-Ⅱ brushing machine was equipped with flat medium-bristle toothbrush and the dyed bovine incisors with L^* in the range of [40, 50] were chosen to be brushed for 600 times at 100 r/min. The results showed that the established method could effectively distinguish the difference between samples. The relative standard deviation （RSD） between experimental batches was less than 10% and the results were reproducible. This method was low-cost, short-period and easily operated. It might provide reliable and scientific test results for the efficacy of whitening and stain-removed toothpastes.

Key words: toothpaste, extrinsic stain, removal, efficacy evaluation

CLC Number:

TQ658

Wang Jicai, Jian Ruidong, Xie Yu, Chen Xiaobin, Zhou Yi, Tan Jianhua. Study on the standardization of evaluation for the efficacy of toothpaste in extrinsic stain removal[J].China Surfactant Detergent & Cosmetics, 2023, 53(9): 1101-1107.

Figures/Tables 9

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References 21

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	刷毛长度/mm	刷丝直径/mm	刷毛磨圆率/ %	毛束弯曲力/ N
标准牙刷	10.90	0.20	69	6.86
普通牙刷	10.90	0.22	73	6.20

L^*值范围	牙刷	L^*值（n=4）		ΔL^*值	显著性
L^*值范围	牙刷	刷牙前	刷牙后	ΔL^*值	显著性
30~40	普通牙刷	34.44±1.32	32.65±2.04	-1.80±0.75	NS
30~40	标准牙刷	34.69±0.88	33.80±1.27	-0.89±0.96	NS
40~50	普通牙刷	45.78±2.11	45.87±3.00	0.09±0.93	NS
40~50	标准牙刷	46.66±0.51	46.82±1.45	0.16±1.46	NS
50~60	普通牙刷	52.67±2.13	52.67±2.35	0.00±1.49	NS
50~60	标准牙刷	54.32±2.78	53.89±1.95	-0.43±1.71	NS

设备型号	L^*值（n=8）		ΔL^*值
设备型号	刷牙前	刷牙后	ΔL^*值
V8	47.88±1.71	59.02±1.98	11.14±1.69
L8-Ⅱ	48.02±1.36	60.05±3.20	12.03±2.30

L^*值范围	L^*值（n=8）		ΔL^*值
L^*值范围	刷牙前	刷牙后	ΔL^*值
30~40	31.92±1.67	44.76±1.82	12.85±1.20
40~50	44.45±0.50	57.37±2.78	12.92±2.90
50~60	55.20±2.05	61.32±3.09	6.12±1.88

生产批次	L^*值（n=8）		ΔL^*值
生产批次	刷牙前	刷牙后	ΔL^*值
1	43.20±1.53	54.23±1.57	11.03±2.20
2	43.22±1.31	53.95±1.10	10.73±0.91
3	42.95±1.28	55.58±4.20	12.63±3.86
4	43.31±1.16	56.70±3.36	13.39±3.32

Study on the standardization of evaluation for the efficacy of toothpaste in extrinsic stain removal

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方案	刷磨频率/（r/min）	处理时间/min	刷磨次数
A	80	10（刷磨）	600
B	120	6.7（刷磨）
C	120	3.3（浸泡）+ 6.7（刷磨）

方案	L^*值（n=8）		ΔL^*值
方案	刷牙前	刷牙后	ΔL^*值
A	43.73±0.38	65.57±3.85	21.83±3.78
B	43.71±0.58	65.75±1.25	22.04±1.53
C	43.40±0.58	64.92±2.03	21.51±1.95

样品	实验批次	ΔL^*均值（n=8）	批次间ΔL^*值（n=5）平均值±标准差
二氧化硅	1	12.92	12.52±0.83
	2	13.50
	3	12.79
	4	12.03
	5	11.37
牙膏B	1	12.72	12.40±0.66
	2	12.32
	3	11.32
	4	12.59
	5	13.04

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