Interaction between toothbrushes and toothpaste abrasive particles in simulated tooth cleaning

Lewis, Roger; Dwyer-Joyce, R. S.; Pickles, M J

doi:10.1016/j.wear.2004.01.015

Cited by 36 publications

(34 citation statements)

References 12 publications

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“…It has been documented that brushing of unfinished composite specimens with water had almost no effect on composite wear 19) . Concerning loading force of toothbrushes during action there is no standard either 17,[20][21][22] . In a clinical trial on 94 patients the average toothbrushing force registered was 350 g with a range from 140 through 720 g 23) .…”

Section: Discussionmentioning

confidence: 99%

Resistance of nanofill and nanohybrid resin composites to toothbrush abrasion with calcium carbonate slurry

et al. 2009

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The aim of this study was to investigate the wear of four nanofilled resin composites using simulated toothbrushing for 50,000 cycles with calcium carbonate slurry. The depth of abrasion and roughness (Ra) were measured after each 10,000 brushing cycle. The surface texture of the worn samples was examined by SEM.The wear depths of the nanofill Filtek Supreme XT (FIL), the nanohybrides Grandio (GRA), Tetric EvoCeram (TET), and Venus Diamond (VED) increased linearly with numbers of brushing cycles or approximately 80, 12, 600, and 60 µm, respectively after 50,000 strokes. Surface roughness showed virtually no change between 10,000 and 50,000 brushing cycles; the ranking order was TET < FIL < GRA < VED. FIL showed rather uniform abrasion with nanoclusters protruding from the surface. TET was very smoothly abraded without signs of debonding of the prepolymerized particles, whereas GRA and VED showed pronounced wear of the matrix polymer surrounding larger glass filler particles.

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Section: Discussionmentioning

confidence: 99%

Resistance of nanofill and nanohybrid resin composites to toothbrush abrasion with calcium carbonate slurry

et al. 2009

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“…The particles appeared to re-orientate themselves just before entering the filament tip contact as if to find the path of least resistance. This was very different to the action of silica particles under similar conditions [16]. They were seen to build-up around the filament tip, as shown in Figure 5c, with some passing through the tip contact at low loads and filament deflections.…”

Section: Resultsmentioning

confidence: 79%

“…This was the same apparatus as used in the previous work using ~10m silica particles [16]. A toothbrush head was loaded against a rotating glass disc using a hydraulic actuator.…”

Section: Test Apparatusmentioning

confidence: 99%

“…Work has been undertaken to study particle/filament interaction visually [16], identified above as being critical in the cleaning process, which has shown how silica particles are entrained in a filament/counterface contact and subsequently loaded against the counterface. The effect of varying load and filament deflection was also qualitatively determined.…”

Section: Introductionmentioning

confidence: 99%

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Particle motion and stain removal during simulated abrasive tooth cleaning

Lewis

Barber

Dwyer-Joyce

2007

Wear

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Stain removal from teeth is important both to prevent decay and for appearance. This is usually achieved using a filament based tooth with a toothpaste consisting of abrasive particles in a carrier fluid. This work has been carried out to examine how these abrasive particles interact with the filaments and cause material removal from a stain layer on the surface of a tooth. It is important to understand this mechanism as while maximum cleaning efficiency is required, this must not be accompanied by damage to the enamel or dentine substrate.In this work simple abrasive scratch tests were used to investigate stain removal mechanism of two abrasive particles commonly used in tooth cleaning, silica and perlite. Silica particles are granular in shape and very different to perlite particles, which are flat and have thicknesses many times smaller than their width.Initially visualisation studies were carried out with perlite particles to study how they are entrained into a filament/counterface contact. Results were compared with previous studies using silica. Reciprocating scratch tests were then run to study how many filaments have a particle trapped at one moment and are involved in the cleaning process. Stain removal tests were then carried out in a similar manner to establish cleaning rates with the two particle types. Perlite particles were found to be less abrasive than silica. This was because of their shape and how they were entrained into the filament contacts and loaded against a counterface. With both particles subsurface damage during stain removal was found to be minimal.A simple model was built to predict stain removal rates with silica particles, which gave results that correlated well with the experimental data.

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“…1 The increased load was chosen anticipating that higher force will result in higher wear and roughness. 7,21 Especially, with highly wear resistant resin composites higher load of the abrasive slurry will produce measurable wear depths even at smaller numbers of brush strokes. Van der Weiden et al 22 determined the toothbrushing force of 94 people.…”

Section: Toothbrush Abrasion Of Resin Composites With Different Fillementioning

confidence: 99%

Toothbrush Abrasion of Resin Composites with Different Filler Concepts

Kyoizumi¹,

Kanehira²,

Finger³

et al. 2012

World Journal of Dentistry

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Purpose: To investigate the effect of tooth brushing wear with and without calcium carbonate slurry on four commercial resin composites based on different filler concepts. Materials and methods:One nanofiller composite MI FIL (MFI, GC), one conventional hybrid type Venus (VEN) and two nanohybrid composites Venus Diamond (VED) and Venus Pearl (VEP) all from Heraeus Kulzer were examined. Forty beam-shaped specimens (12 × 3 × 3 mm) from each product were prepared and subdivided in two equal groups for pregrinding on SiC paper #600 and #4000 respectively. Ten specimens of each pre-ground group were subjected to toothbrush abrasion with calcium carbonate slurry, and 10 to toothbrushing with water only. The samples were submitted to five subsequent runs of 10,000 brushing strokes. Depth of wear and surface roughness (Ra) were measured with a profilometer after each 10 k strokes. Specimens after 50 k strokes were assessed by SEM. Additionally, the KHN (0.25 N/15 s) and the degree of conversion (DC) were determined. Data analysis was done by linear regression and ANOVA followed by Tukey's post-hoc test (p < 0.05). Results: Toothbrushing with abrasive slurry produced significantly different wear depths: VEN > MIF > VEP > VED.Linear relationships between depth of wear and number of cycles (r 2 > 0.94) were established for each material. Pregrinding with SiC #4000 resulted in less wear than pregrinding with #600. Ra figures were much higher for VED than for the other materials tested. MIF and VEN were uniformly abraded, whereas the largest glass fillers in VED protruded from the surroundings and the prepolymer particles in VEP were deeper abraded than the bulk of the material. Toothbrushing with water only revealed not measurable wear. Roughness Ra was practically unchanged when compared with the preground samples before challenging with toothbrushes. Ranking by KHN was: MIF < VEN, VEP < VED, by DC: MIF < VEN < VEP < VED. Conclusion:Filler concepts and monomer compositions affect wear and roughness of resin composites when tooth brushed with abrasive slurry. Toothbrushing without abrasive medium produced neither wear nor roughness. Careful polishing of resin composite restorations is an important determinant of wear and surface roughness.

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Interaction between toothbrushes and toothpaste abrasive particles in simulated tooth cleaning

Cited by 36 publications

References 12 publications

Resistance of nanofill and nanohybrid resin composites to toothbrush abrasion with calcium carbonate slurry

Resistance of nanofill and nanohybrid resin composites to toothbrush abrasion with calcium carbonate slurry

Particle motion and stain removal during simulated abrasive tooth cleaning

Toothbrush Abrasion of Resin Composites with Different Filler Concepts

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