Hardness characteristic of dental porcelain synthesized from Indonesian natural sand

Gunawan, Joseph; Taufik, Dede; Takarini, Veni; Hasratiningsih, Zulia; Ramelan, Agus

doi:10.1063/1.5023938

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…Most researches show that enamel may be subject to accelerated wear with ceramic opposite materials [3]. Even though the results are still higher than enamel hardness (270-360 VHN), this study has significantly lowered the hardness number results compared to our previous research samples yielded 936,06 VHN [7,8], by removing Sukabumi kaolinite from the mixture. The average Vickers hardness result was then evaluated by statistical analysis using one-way factorial ANOVA with Fisher's LSD method as seen in Figure 2.…”

Section: Resultsmentioning

confidence: 57%

Surface Characterization of Dental Porcelain Made from Sumatera Natural Sand

Takarini

Kurnia

Taufik

et al. 2018

KEM

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This research reported hardness and porosity morphology results on five different sintering temperatures as surface characterization of dental porcelain made from Sumateran natural sand mixture composition to prevent excessive wear. Porosity morphology was characterized with JEOL Scanning Electron Microscope (SEM), while the average hardness of each 5 different indented areas was performed with 1000 gr load for 15 seconds using Zwick Roell Vickers Hardness Tester. The result of this study shows that the higher sintering temperature correlates to higher hardness number. SEM analysis indicate less porosity appear in the samples sintered in higher temperature. By modifying the mixture, this study has significantly lowered the hardness number results compared to our previous research samples yielded 936,06 VHN. It can be concluded that positive correlation between higher temperature and hardness emerged from the surface characterization results of the dental porcelain made from Sumatera natural sand. In contrasts the porosity appear to be less developed in higher temperature. However, cracks and pores followed the indentation as in common ceramic products. Further improvement is needed with finding the optimum temperature of desired hardness number and predictable porosity, which resemble tooth enamel.

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Section: Resultsmentioning

confidence: 57%

Surface Characterization of Dental Porcelain Made from Sumatera Natural Sand

Takarini

Kurnia

Taufik

et al. 2018

KEM

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“…Porcelain is an inorganic ceramic material obtained by sintering Kaolin (Al2O32SiO)22H2O, Silica (SiO2) and Feldspar (K2O.Al2O3.6SiO2) such that they react with one another at appropriately high temperature [1,2]. Kaolin serves as the plastic material while silica and feldspar are the non-plastic materials.…”

Section: Introductionmentioning

confidence: 99%

“…The composition of the starting raw materials and the temperature of fusion determine the type of porcelain. Dental porcelain is usually produced as a dental prosthesis to replace either missing or damaged dental structures [1,6]. Tooth loss can be very traumatic, upsetting and may be regarded as a serious life event that needs to be solved to avoid social and psychological problems [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of feldspar and silica variation on the properties of dental porcelain

Okoubulu¹,

Mgbemere²,

Obidiegwu³

et al. 2023

Nig. J. Tech.

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Dental porcelain was produced by mixing feldspar, silica, kaolin and bone ash by varying the contents of feldspar and silica. The processing steps include milling, sieving, pressing/shaping, drying, and sintering while the characterisation techniques were Hardness, Compressive strength, X-ray diffraction, Scanning electron microscopy and Fourier Transform Infrared (FTIR). The mixture was subjected to temperatures of 1100 and 1200 oC in a sintering furnace. The chemical composition was determined using X-ray fluorescence and they confirm that SiO2 and Al2O3 are the two major constituents in feldspar and kaolin while CaO is the major constituent in bone ash. For samples sintered at 1200oC, the X-ray diffraction showed that some glass phase possibly consisting of hedenbergite, ilmenite and silica were formed while crystalline phases namely microcline and sanidine were obtained for samples sintered at 1100°C. The morphology of the grains revealed that samples sintered at 1200oC had some hexagonal silica crystals while flakes of different sizes were obtained for samples sintered at 1100oC. Hardness values between 262 and 536 BHN, compressive modulus values ranging from 219 MPa to 324 MPa and linear shrinkage values between 6.34 and 7.6% were obtained. The batches of different compositions with ranges: quartz (silica) (15-25%), feldspar (70-80%), kaolin (Edda/Bauchi) (4%) and bone ash (1%) were fired at 1100, 1200oC, and the developed properties were tested. The sample with 70 wt.% of feldspar, 25 wt.% silica, 4 wt.% of Bauchi clay, and 1 wt.% bone ash sintered at 1200oC gave the best properties and has the potential to be used in dental restoration.

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“…Pangaribuan's (North Sumatra) feldspar has the highest potassium alumino silicate (orthoclase) level of 10% and the lowest impurity content (Fe2O3) of 0.24%. Other materials such as silica are found in the Belitung region (South Sumatra) [7].…”

Section: Introductionmentioning

confidence: 99%

Sintering Temperature Effect on Hardness of Self-Synthetisized Porcelain Made from Natural Sumatran Sand without Kaolin

Kurnia

Taufik

Takarini

et al. 2018

KEM

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Dental porcelain is one of the indirect restoration material with excellent aesthetic properties,on the other hand porcelain hardness frequently causing excessive wear of antagonist teeth. This study aiming to evaluate the effect of sintering temperature on the self-synthesized porcelain hardness. In this experiment, 25 porcelain samples were synthesized using Sumatran sand from Pangaribuan and Belitung regions, with the composition of 65 wt% Pangaribuan feldspar, 25 wt% Belitung silica and 10 wt% potassium salt. The samples were sintered in five different temperatures, which were 1110°C (A), 1120°C (B), 1130°C (C), 1140°C (D), and 1150°C (E). These samples were then invested on 5cm diameter resin each. The hardness was tested using Zwick Roell ZHμ Micro Vickers with 900 gram load for 15 seconds in 5 different indented areas for each sample. The result shows average hardness of 435.8 VHN (A), 461.0 VHN (B), 472.0 VHN (C), 487.6 VHN (D), and 528.7 VHN (E), which were increasing as the sintering temperature increased. Statistic result shows that sintering temperature significantly affected the hardness value of the porcelain (p value < 0.05). In conclusion sintering temperature affects the hardness of self-synthesized porcelain made from Sumatran natural sand without kaolin, although the average hardness of self-synthesized porcelain is still higher than average hardness of teeth enamel.

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Hardness characteristic of dental porcelain synthesized from Indonesian natural sand

Cited by 7 publications

References 7 publications

Surface Characterization of Dental Porcelain Made from Sumatera Natural Sand

Surface Characterization of Dental Porcelain Made from Sumatera Natural Sand

Effect of feldspar and silica variation on the properties of dental porcelain

Sintering Temperature Effect on Hardness of Self-Synthetisized Porcelain Made from Natural Sumatran Sand without Kaolin

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