Effect of dentin pretreatment on the resulting abrasive dentin wear

Abstract

Background This study aims to investigate the influence of different dentin pretreatment procedures on the resulting abrasive dentin wear. Methods Two groups (A, B) of 60 dentin samples each were prepared. Group A was brushed with an abrasive slurry (RDA = 85) and group B with a different abrasive slurry (RDA = 174). Four subgroups in each group (n = 15) were created (A1–A4) and (B1–B4). The subgroups were pretreated as follows: A1 + B1 with 1200-grit grinding paper, A2 + B2 with 1200- and 2000-grit papers, A3 + B3 with 1200-, 2000-, and 4000-grit papers, A4 + B4 with 1200-, 2000-, 4000-grit papers and with 1000 brushing strokes with a slurry of Elmex toothpaste. All samples were brushed for 25 min at 120 strokes/min. Abrasive dentin wear was measured for each sample profilometrically and the subgroups were compared with each other within the same group. Repeated measures one-way ANOVA was conducted to compare the subgroups and pairwise contrasts were estimated for multiple testing according to Tukey (α = 0.05). Results The resulting abrasive dentin wear in group A ranged between 15.3 ± 3.4 µm and 17.3 ± 5.5 µm and between 20.3 ± 6.8 µm and 22.5 ± 2.6 µm in group B. No statistically significant difference was noticed between any subgroups within the same group (p ˃ 0.05). Conclusions Different dentin pretreatment procedures do not affect the resulting abrasive dentin wear independent of the RDA value of the employed abrasive slurry.

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

“…The dentin samples were pretreated with 2000‐ and 4000‐grit carborundum papers in this study, which has also been the case in other abrasion studies 17,18 . Regardless, a recent in vitro study reported that different pretreatment procedures of dentin samples do not seem to have an effect on the resulting abrasive dentin wear 12 . The applied brushing forces in this study (1–4 N) are also in accordance with most of other abrasion studies 19 .…”

“…As mentioned above, group C was brushed with almost twice stronger abrasive slurry as group A (RDA 133 vs RDA 71), which is also reflected in the mean abrasive values observed in both groups at 2‐, 3‐ and 4‐N brushing force. This agreement between RDA and profilometry methods was not always the case in previous studies 12,26 . Further elaborations might be necessary in this area.…”

“…Fifteen samples extracted from 15 different incisors in each group made the final experimental subgroups as shown in Table 1. The sample size was determined to be similar to previously published abrasive study 12 . The dentin samples were pretreated in an automatic grinding machine at 5 N and 80 rpm (Tegramin‐30, Stuers) using 2000‐ and then 4000‐grit carborundum paper for 20 and 30 s, respectively.…”

“…The sample size was determined to be similar to previously published abrasive study. 12 The dentin samples were pretreated in an automatic grinding machine at 5 N and 80 rpm (Tegramin‐30, Stuers) using 2000‐ and then 4000‐grit carborundum paper for 20 and 30 s, respectively. Further details to the preparation procedure of the samples are well‐protocolled in an earlier study.…”

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

“…This might raise some questions on the relevance of the method vs consumer/patient use. The here used brushing time is kind of a standard and regularly used in testing abrasive dentin wear in vitro 23 , 25 , 26 . Furthermore, it's a worse-case scenario which might be reached under clinical conditions much later.…”