Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University.
Department of Cariology, Operative Dentistry, and Dental Public Health, School of Dentistry, Indiana University, Oral Health Research Institute.
J Oral Sci. 2021;63(2):191-194. doi: 10.2334/josnusd.20-0478.
To investigate the effect of slurry abrasive levels and acidic challenges on the development of non-carious cervical lesions.
Ninety-six extracted upper premolars were affixed in pairs to acrylic blocks and had their root surfaces covered by acrylic resin except for 2 mm from the cemento-enamel junction. The specimens were distributed into six groups (n = 8 pairs) based on two experimental factors: (1) slurry abrasivity level [low/medium/high] and (2) citric acid challenge [yes/no]. Specimens were brushed for 5,000, 15,000, 35,000, and 65,000 strokes. Volume loss (VL) was determined based on optical profilometry scans of specimens impressions at the baseline and at subsequent brushing levels. Data were analyzed using repeated measures analysis of variance and Bonferroni pairwise comparison (α = 0.05).
Higher VL values were associated with high-abrasivity slurries relative to low- and medium-abrasivity slurries (P < 0.001). Increasing the slurry abrasivity level increased the VL regardless of the acidic challenge, which did not have a significant effect (P = 0.184). After 65,000 strokes, significant VL was recorded in all groups relative to preceding brushing levels (P < 0.001).
Higher values of time-dependent surface loss were associated with increased dentifrice slurry abrasivity, regardless of the citric acid challenge.
研究料浆研磨水平和酸性挑战对非龋性颈损发展的影响。
将 96 颗上颌前磨牙成对固定在丙烯酸块上，除牙釉质牙骨质交界处 2mm 外，将其根面用丙烯酸树脂覆盖。根据两个实验因素将样本分为六组（n=8 对）：（1）料浆研磨性水平[低/中/高]和（2）柠檬酸挑战[有/无]。样本经 5000、15000、35000 和 65000 次刷洗。根据基线和后续刷洗水平的样本印模光学轮廓扫描确定体积损失（VL）。使用重复测量方差分析和 Bonferroni 成对比较（α=0.05）对数据进行分析。
与低研磨性和中研磨性料浆相比，高研磨性料浆的 VL 值更高（P<0.001）。无论酸性挑战如何，增加料浆研磨性水平都会增加 VL，这没有显著影响（P=0.184）。在经过 65000 次刷洗后，与之前的刷洗水平相比，所有组均记录到明显的 VL（P<0.001）。
与柠檬酸挑战无关，随着牙膏料浆研磨性的增加，表面损耗的时间依赖性值增加。
