Light transmission characteristics of dentine and resin composites with different thickness

Nakajima, Masatoshi; Arimoto, Ayako; Prasansuttiporn, Taweesak; Thanatvarakorn, Ornnicha; Foxton, Richard M.; Tagami, Junji

doi:10.1016/j.jdent.2012.08.016

Cited by 53 publications

(33 citation statements)

References 17 publications

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“…In the case of incisors and canines where dentine samples had oblique-cut and long-cut dentine tubules, the incident light formed a larger angle to the dentine tubules. Therefore, the tubule space (that may contain water, mineral deposits, air or dentinal fluid), the collagen fibers, the mineral crystals of hydroxyapatite and the components of the tubule wall, all with various refractive indexes [16,23], were responsible for random scattering of light and translated in higher S and RI values.…”

Section: Discussionmentioning

confidence: 99%

Dentine scattering, absorption, transmittance and light reflectivity in human incisors, canines and molars

Pop-Ciutrila

Ghinea

Gómez

et al. 2015

Journal of Dentistry

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Section: Discussionmentioning

confidence: 99%

Dentine scattering, absorption, transmittance and light reflectivity in human incisors, canines and molars

Pop-Ciutrila

Ghinea

Gómez

et al. 2015

Journal of Dentistry

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“…This material was chosen since it is well known to offer excellent and repeatable optical and aesthetic properties, in contrast to bovine-and human dentin, which may exhibit a vast variety of chroma and translucency properties, even when appearing the same color. The thickness of the tested material significantly influences the light transmission 20) . For the most indirectly used polymer materials, the manufacturer recommends a thickness of at least 1 mm.…”

Section: Discussionmentioning

confidence: 99%

“…The light transmission of a resin material is related to multiple refractions and reflections at the matrix/ filler interface, which are influenced by the difference in refractive index between the filler particle and the matrix 20) . Differences also occur regarding the fluorescence properties of the individual materials.…”

Section: Discussionmentioning

confidence: 99%

Optical properties of manually and CAD/CAM-fabricated polymers

et al. 2013

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“…29 The difference between the refractive indices of the fillers and matrix affects the refraction and reflection of light at the filler/matrix interface and, thereafter, the translucency of the nanocomposite. 52 It was found that the refractive index of the nano-ZrO 2 (2.1750) is higher than that of the PMMA (1.4813). 53 Since this nanocomposite was composed of resin and inorganic nanoparticles, the higher the refractive index difference between the two phases, the greater the opacity of the nanocomposite ( Figure 5A and B).…”

Section: 15mentioning

confidence: 98%

Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material

Gad¹,

Abualsaud²,

Rahoma

et al. 2018

IJN

116

119

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Background Polymethyl methacrylate (PMMA) is widely used for the fabrication of removable prostheses. Recently, zirconium oxide nanoparticles (nano-ZrO 2 ) have been added to improve some properties of PMMA, but their effect on the optical properties and tensile strength are neglected. Objective The aim of this study was to investigate the effect of nano-ZrO 2 addition on the translucency and tensile strength of the PMMA denture base material. Materials and methods Eighty specimens (40 dumbbell-shaped and 40 discs) were prepared out of heat-polymerized acrylic resin and divided into four groups per test (n=10). The control group for each test included unreinforced acrylic, while the test groups were reinforced with 2.5, 5, and 7.5 wt% nano-ZrO 2 . Acrylic resin was mixed according to manufacturer’s instructions, packed, and processed by conventional method. After polymerization, all specimens were finished, polished, and stored in distilled water at 37°C for 48±2 hours. Tensile strength (MPa) was evaluated using the universal testing machine while the specimens’ translucency was examined using a spectrophotometer. Statistical analysis was carried out by SPSS using the paired sample t -test ( p ≤0.05). A scanning electron microscope was used to analyze the morphological changes and topography of the fractured surfaces. Results This study showed that the mean tensile strength of the PMMA in the test groups of 2.5%NZ, 5%NZ, and 7.5%NZ was significantly higher than the control group. The tensile strength increased significantly after nano-ZrO 2 addition, and the maximum increase seen was in the 7.5%NZ group. The translucency values of the experimental groups were significantly lower than those of the control group. Within the reinforced groups, the 2.5%NZ group had significantly higher translucency values when compared to the 5%NZ and 7.5%NZ groups. Conclusion The addition of nano-ZrO 2 increased the tensile strength of the denture base acrylic. The increase was directly proportional to the nano-ZrO 2 concentration. The translucency of the PMMA was reduced as the nano-ZrO 2 increased. Clinical significance Based on the results of the current study, the tensile strength was improved with different percentages of nano-ZrO 2 additions. However, translucency was adversely affected. Therefore, it is important to determine the appropriate amount of reinforcing nano-ZrO 2 that will create a balance between achieved properties – mechanical and optical.

show abstract

Light transmission characteristics of dentine and resin composites with different thickness

Cited by 53 publications

References 17 publications

Dentine scattering, absorption, transmittance and light reflectivity in human incisors, canines and molars

Dentine scattering, absorption, transmittance and light reflectivity in human incisors, canines and molars

Optical properties of manually and CAD/CAM-fabricated polymers

Effect of zirconium oxide nanoparticles addition on the optical and tensile properties of polymethyl methacrylate denture base material

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