Effect of dentifrice slurry abrasivity and erosive challenge on simulated non-carious cervical lesions development <i>in vitro </i>

Abstract

Purpose: To investigate the effect of slurry abrasive levels and acidic challenges on the development of non-carious cervical lesions. Methods: 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). Results: 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). Conclusion:Higher values of time-dependent surface loss were associated with increased dentifrice slurry abrasivity, regardless of the citric acid challenge.

Association of Non-carious Cervical Lesions With Oral Hygiene Aspects and Oclusal Force

“…After NCCLs onset, other factors may in uence the progression of the lesion, including erosion. It has been pointed out in the literature [21,24], that not only occlusion is related to NCCLs, but also chemical agents could be related to the etiology of erosion and physical factors such as abrasion.…”

“…Abrasion consists of the wear of dental tissues through frequent contact of objects which results in mechanical wear, while erosion is the chemical loss of hard dental tissue by the action of intrinsic and extrinsic acids [21,22]. The occlusal factor is discussed in the literature as a possible factor that may be associated with the etiology and progression of non-carious cervical lesions, usually related with occlusal trauma by lateral forces, a subject not well described in the literature [10,16,23,24].…”

Effect of brushing force on the abrasive dentin wear using slurries with different abrasivity values

“…At the same time, the presence of those abrasives leads to the removal of some sound tooth hard tissue, the so‐called ‘abrasive dentin – or enamel – wear’ 1 . Abrasive dentin wear has been repeatedly considered a co‐factor in the development of non‐carious cervical lesions (NCCL) 2–4 . Therefore, previous studies have attempted to investigate some of the presumed modifying factors of abrasive dentin wear 5–7 …”

Effect of the toothbrush tuft arrangement and bristle stiffness on the abrasive dentin wear

“…It is well known that toothbrushing not only removes dental plaque, but could also remove parts of the sound tooth hard tissue (abrasive enamel or dentin wear) 4 . This abrasive wear was classified as an important factor in the development of non-carious cervical lesions (NCCL) in many studies 5 – 10 .…”