In vitro toothbrush-dentifrice abrasion of resin-modified glass ionomers

Momoi, Yasuko; Hirosaki, Kunitsugu; Kohno, Atsushi; McCabe, J.F.

doi:10.1016/s0109-5641(97)80016-4

Cited by 68 publications

(65 citation statements)

References 11 publications

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“…Specimens were maintained in 100% relative humidity at 37°C for 20 min (7,8) and embedded in acrylic resin (Varidur; High Performance Mounting Kit; Buehler, Lake Bluff, IL, USA) to facilitate mounting in the testing devices. Specimen surfaces were wet-polished using a sequence of 500, 1,200, 2,400, and 4,000 grit silicon carbide paper (9), then immersed in distilled water at 37°C for 24 h (6,(8)(9)(10).…”

Section: Specimen Preparationmentioning

confidence: 99%

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Physicomechanical properties of a zinc-reinforced glass ionomer restorative material

et al. 2014

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We compared a zinc-reinforced glass ionomer restorative material (ChemFil Rock) with three commercially available glass ionomer cements (GICs), namely, Fuji IX GP Extra, Ketac Molar Quick Aplicap, and EQUIA Fil, with respect to fracture toughness, microhardness, roughness, and abrasive wear. Fracture toughness (K IC ) was tested according to ISO 13586 (n = 10). Hardness, roughness, and abrasive wear were also tested (n = 9). Data were analyzed using the Wilcoxon rank-sum test with adjustment for multiple comparisons (α = 0.05). As compared with the other GICs ChemFil Rock exhibited a greater increase in surface roughness (P < 0.05) and lower microhardness (P < 0.01). The wear resistance of ChemFil Rock was comparable to that of the other GICs (P > 0.05). ChemFil Rock had significantly lower fracture toughness as compared with EQUIA Fil (P = 0.01) and significantly higher fracture toughness as compared with the other GICs (P < 0.02). In conclusion, as compared with the three other commercially available GICs, ChemFil Rock had intermediate fracture toughness, the lowest microhardness, and the greatest change in surface roughness. (J Oral Sci 56, 11-16, 2014)

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Section: Specimen Preparationmentioning

confidence: 99%

“…Next, each specimen was mounted on a custom-made toothbrushing machine and brushed using a straight, soft toothbrush (Oral-B 40, Procter & Gamble, Cincinnati, OH, USA) with a load of 1.96 N (14-16) at a speed of 175 cycles/min for 20,000 double strokes (7,17,18). This is reported to simulate roughly 2 years of brushing (18).…”

Section: Toothbrushing Abrasion Testmentioning

confidence: 99%

Physicomechanical properties of a zinc-reinforced glass ionomer restorative material

et al. 2014

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“…Thus, the latter is more susceptible to degradation. 27 Turker and Biskin 10 in 2002 reported an increase in microhardness of GICs after bleaching and attributed this increase to accumulation of silica cores on the GIC surface after bleaching and erosion of cement and movement of indenter of Vickers hardness tester on these cores. The results of the current study showed no significant difference in microhardness among the laser-bleached subgroups of each of the conventional and resin modified GICs.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Effect of Bleaching With 810 nm and 980 nm Diode Laser on Microhardness of Self-cure and Light-Cure Glass Ionomer Cements

Omrani

Khoshamad

et al. 2017

J Lasers Med Sci

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IntroductionIn the recent years, tooth bleaching has become increasingly popular due to its optimal efficacy and non-invasive nature. It can be performed in the office or at home by use of over the counter products.1 This treatment is based on the use of hydrogen peroxide or carbamide peroxide, which release unstable free radicals that react with stains and pigments and result in tooth whitening.2 Factors such as the concentration of hydrogen peroxide and the source of energy as driving force of chemical reactions can affect the efficacy of bleaching treatment.3 High-intensity light was first used to enhance the whitening chemical reactions. Thermal lamps and hot spatula were later used as heat source to enhance the whitening reaction. Although effective, these methods carried the risk of pulp hyperthermia. 4 Presently, activating light sources such as plasma arc lamps and laser at different wavelengths have replaced direct heat to enhance the whitening efficacy of bleaching agents.5 Use of lasers such as diode laser at 810 or 980 nm wavelength and Nd:YAG laser at 1060 nm wavelength is increasing for this purpose due to the optimal efficacy of photothermal bleaching. 6On the other hand, there are some concerns regarding the effects of bleaching treatment on dental materials, which are susceptible to wear and degradation. Chemical softening caused by bleaching can potentially affect the physical and mechanical properties of toothcolored restorative materials such as microhardness and roughness. 8,9 Dental materials may show variable reactions to bleaching agents. These reactions may range from alterations in surface morphology to change in their physical and chemical properties. Microhardness is defined as resistance of a material to indentation. As one of the most important properties of restorative materials, microhardness is often measured to This study sought to assess the effect of bleaching combined with irradiation of 810 nm and 980 nm diode laser on microhardness of 2 commonly used self-cure and light-cure glass ionomer cements (GICs) in comparison with conventional bleaching (without laser). Methods: In this in vitro, experimental study, 60 samples were fabricated of A2 shade of Fuji IX and Fuji II LC GICs (n = 30) and each group was divided into 3 subgroups (n = 10). The first subgroups were subjected to bleaching with Opalescence Xtra Boost plus 980 nm diode laser irradiation. The second subgroups were subjected to bleaching with Opalescence Boost plus 810 nm diode laser irradiation and the third subgroups were subjected to bleaching with Opalescence Xtra Boost without laser. Microhardness was measured at baseline and after the intervention using Vickers hardness tester. The data were analyzed using two-way analysis of variance (ANOVA) (P < 0.05). Results: Microhardness decreased in all subgroups after the intervention (P < 0.001) irrespective of the type of GIC (P = 0.201) or surface treatment (P = 0.570). The baseline microhardness of the three subgroups within each group of GIC was not significantly...

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“…To exemplify, Mair et al 5 , Yap et al 6 , Condon & Ferracani 7 , and Momoi et al 8 used devices that reproduce the wear of composite resins in a complex interaction of the mechanisms of erosion, corrosion, adhesion, abrasion and impact. Deterioration can also be accelerated through mechanical fatigue.…”

Section: Introductionmentioning

confidence: 99%

Analysis of polymerization time on abrasive wear of dental resins

et al. 2010

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An evaluation was made of the abrasive wear of six composite thermofixed dental resins subjected to different polymerization times. The method of evaluation was based on sharpness measurements to quantify the abrasive wear resistance of the resins. To this end, a test bench was built, consisting of a rotating porcelain cylinder that wears out a resin-coated cylinder placed above it, thus causing vertical displacement of the contact as the wear progresses. The values of vertical displacement, i.e., the input variables, were read and recorded by means of a computer program to obtain the sharpness values. These data indicated that the resins displayed different behaviors as a function of the polymerization times applied, reinforcing the importance of using a practical and rapid method of analysis in order to ensure that the behavior of new materials is fully understood before they are launched on the market.

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In vitro toothbrush-dentifrice abrasion of resin-modified glass ionomers

Cited by 68 publications

References 11 publications

Physicomechanical properties of a zinc-reinforced glass ionomer restorative material

Physicomechanical properties of a zinc-reinforced glass ionomer restorative material

In Vitro Effect of Bleaching With 810 nm and 980 nm Diode Laser on Microhardness of Self-cure and Light-Cure Glass Ionomer Cements

Analysis of polymerization time on abrasive wear of dental resins

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