Simulation of Mechanical Behaviour in Milling and Polishing of Dental Polymeric (resin) Composites

Voicu, Gheorghe; Constantin, Gabriel; Saracin, Alexandru

doi:10.37358/mp.18.3.5019

Cited by 2 publications

(3 citation statements)

References 26 publications

(23 reference statements)

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“…The experimental results will be noted in a table, as shown in Table 2. Based on the results in the table above, the degree of mechanical wear of the samples and frets during the test will be determined, taking into account the rotational speed, the translation speed and the pressing force [10].…”

Section: Resultsmentioning

confidence: 99%

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Determination of use of dental materials and stomatological frees on stand

Saracin

Voicu

Saracin

et al. 2019

Engineering for Rural Development

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The authors propose in this paper testing of materials used in dental constructions and dental cutters used for their processing on an electric stand, made by the authors. The stand will be equipped with a transmission that ensures variation of the rotation speed of the cutter from 3000 to 30000 rpm, variation of the sample rotation speed of the tested material from 10 to 300 rpm, vertical and horizontal plane and horizontal rotation mechanisms. The operation of the stand is considered to be simple. In order to carry out the tests, it is necessary and obligatory that the sample preparation operation is carried out in accordance with the validation standards, namely, the knowledge of the sample material, the mechanical properties, the dimensions and their weight. After mounting the samples and the cutter on the stand, the pressing force is established by adding additional weights, the rotation speed of the sample is set and the rotation speed of the cutter is also set to the horizontal movement speed to the cutter (measured in microns) by means of a micrometric screw mounted on the table stand acting on the sample holder.It measures the test time, determines the shape, dimensions and the weight of the samples after each period of time. Following the determinations we can observe the proportionality of the friction force with normal reaction, the connection between the coefficient of friction and the rotation speed during the test, the quality of the sample surfaces and the milling cutter subjected to the test.The study was conducted to determine the wear properties of dental cutters used in dental laboratories, where many materials with different mechanical and technological properties are used.

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Section: Resultsmentioning

confidence: 99%

“…At the end of the test time dimensional measurements shall be made and both the samples and the mills used for the test shall be weighed. Samples will be collected and their size determined, this being influenced by the rotation speed of the cutter and the velocity of the table moving with the samples [10].…”

Section: Fig 6 Stand Dental Milling Tests [10]mentioning

confidence: 99%

Determination of use of dental materials and stomatological frees on stand

Saracin

Voicu

Saracin

et al. 2019

Engineering for Rural Development

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“…While the average particle size of first, so-called macrofill composites were 10-50 µm, with further refinements sub-micron particles appeared in the composition, estabilishing the category of microhybrid composites [1]. The fillers and resins together determine the properties of the composite such as aesthetics (texture, translucency and colour), hardness, polymerization shrinkage and polymerization stress [2,3]. The development of new composite materials containing nano-size particles could not reduce the popularity of microhybrid composites among the dentists.…”

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Effect of Tooth Brushing on Wear of Microhybrid Composites In vitro experiment

Dudás¹,

Székely²,

Gábor³

et al. 2019

Mat.Plast.

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Changes in the surface roughness of dental restorative materials after tooth brushing are inevitable. The abrasion is known to increase the possibility of dental plaque accumulation which is responsible for several pathologies of the oral cavity. The aim of this in vitro study was to evaluate the changes of surface roughness of microhybrid composite materials produced by different toothbrushes with and without toothpaste. Forty-eight specimens of two composite materials (Charisma and Super-Cor) were prepared using a silicone template according to the manufacturer�s instructions. Each sample was brushed for eight hours. Each group of specimens was divided in two subgroups: half of the samples were brushed using only distilled water and the other half with a mixture of distilled water and toothpaste (Colgate Total; ratio 1:1). The average roughness value (Ra) of surfaces were measured with profilometer three times: the initial measurement was performed before starting the toothbrush simulation, the second was after 4 hours and the third was after 8 hours of brushing. Three different bristle stiffness toothbrush heads were used (medium sensitive, medium and soft). After collecting all numerical data one-way ANOVA and Friedman tests were performed for statistical analysis. All examined microhybrid composites exhibited changes in surface roughness after the toothbrush simulation. The simulation of toothbrushing without toothpaste, only with water as cleaning substrate, showed at every measurement the lowest values of roughness in all three toothbrush heads. Significantly increase of mean Ra values were observed in both tested composite samples when medium and soft toothbrushes with toothpaste were used. The surface roughness changes of tested microhybrid composites depend on the brushing procedure. The toothpaste has a much greater effect on the abrasion than the type of toothbrush.

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Simulation of Mechanical Behaviour in Milling and Polishing of Dental Polymeric (resin) Composites

Cited by 2 publications

References 26 publications

Determination of use of dental materials and stomatological frees on stand

Determination of use of dental materials and stomatological frees on stand

Effect of Tooth Brushing on Wear of Microhybrid Composites In vitro experiment

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