scholarly journals PENGARUH PENAMBAHAN HIDROKSIAPATIT DARI CANGKANG TELUR TERHADAP KEKUATAN TEKAN GLASS IONOMER CEMENT

2018 ◽  
Vol 2 (1) ◽  
pp. 75-81
Author(s):  
Martha Mozartha ◽  
Muthiara Praziandithe ◽  
Sulistiawati Sulistiawati
Keyword(s):  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Ionomer Cement

Glass Ionomer Cement (GIC) memiliki sifat-sifat yang menguntungkan sebagai material restorasi. Namun, penggunaannya terbatas karena GIC memiliki kekuatan tekan yang rendah. Berbagai penelitian dilakukan untuk meningkatkan kekuatan tekan GIC, salah satunya penambahan hidroksiapatit ke bubuk GIC. Hidroksiapatit dapat disintesis dari larutan kimia atau berbagai limbah alam, misalnya cangkang telur, melalui metode presipitasi. Tujuan penelitian ini adalah untuk mengetahui pengaruh penambahan hidroksiapatit dari cangkang telur terhadap kekuatan tekan GIC Fuji IX (GC Corporation). Pembuatan 32 silinder GIC berdiameter 4mm dan tinggi 6mm dibagi menjadi 2 kelompok, yaitu: kelompok GIC tanpa penambahan hidroksiapatit sebagai kelompok kontrol (n=16) dan kelompok GIC dengan penambahan 8% hidroksiapatit sebagai kelompok uji (n=16). Kekuatan tekan diukur dengan Universal Testing Machine. Data dianalisis menggunakan uji T tidak berpasangan. Hasil pengukuran rata-rata kekuatan tekan GIC kelompok kontrol adalah 104,33±1,36 MPa dan kelompok uji adalah 109,52±1,58 MPa. Hasil uji T pada data tersebut menunjukkan perbedaan signifikan antar kelompok (p

scholarly journals Compressive strength of glass ionomer cements using different specimen dimensions

2007 ◽  
Vol 21 (3) ◽  
pp. 204-208 ◽  
Author(s):  
André Mallmann ◽  
Jane Clei Oliveira Ataíde ◽  
Rosa Amoedo ◽  
Paulo Vicente Rocha ◽  
Letícia Borges Jacques
Keyword(s):  
Compressive Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Strength Test ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Universal Testing ◽  
Resin Modified Glass Ionomer ◽  
Compressive Strength Test ◽  
Ionomer Cement

The purpose of this study was to evaluate the compressive strength of two glass ionomer cements, a conventional one (Vitro Fil® - DFL) and a resin-modified material (Vitro Fil LC® - DFL), using two test specimen dimensions: One with 6 mm in height and 4 mm in diameter and the other with 12 mm in height and 6 mm in diameter, according to the ISO 7489:1986 specification and the ANSI/ADA Specification No. 66 for Dental Glass Ionomer Cement, respectively. Ten specimens were fabricated with each material and for each size, in a total of 40 specimens. They were stored in distilled water for 24 hours and then subjected to a compressive strength test in a universal testing machine (EMIC), at a crosshead speed of 0.5 mm/min. The data were statistically analyzed using the Kruskal-Wallis test (5%). Mean compressive strength values (MPa) were: 54.00 ± 6.6 and 105.10 ± 17.3 for the 12 mm x 6 mm sample using Vitro Fil and Vitro Fil LC, respectively, and 46.00 ± 3.8 and 91.10 ± 8.2 for the 6 mm x 4 mm sample using Vitro Fil and Vitro Fil LC, respectively. The resin-modified glass ionomer cement obtained the best results, irrespective of specimen dimensions. For both glass ionomer materials, the 12 mm x 6 mm matrix led to higher compressive strength results than the 6 mm x 4 mm matrix. A higher variability in results was observed when the glass ionomer cements were used in the larger matrices.

Nanoparticles as void fillers in glass ionomer cement for enhanced physicomechanical properties

2020 ◽  
Vol 10 (11) ◽  
pp. 1960-1964
Author(s):  
Mansour K. A. Assery ◽  
Abdulrahman Alshubat ◽  
AlWaleed Abushanan ◽  
Nawaf Labban ◽  
Mohamed Hashem
Keyword(s):  
Vickers Microhardness ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Study Groups ◽  
Control Group ◽  
Glass Ionomer ◽  
Universal Testing ◽  
Microhardness Testing ◽  
Diametral Tensile Strength ◽  
Ionomer Cement

The study evaluated the addition of silver (Ag) and titanium dioxide (TiO2) nanoparticles to conventional glass ionomer cement (GIC), considering compressive strength (CS), diametral tensile strength (DTS), flexural strength (FS), and hardness. Ag and TiO2 nanoparticles were blended into the powder of a commercially available GIC restorative material at 5% (w/w). Unblended powder was used as a control. One hundred twenty samples were prepared from two study groups and one control group (n = 10). CS, DTS, and FS were evaluated using a universal testing machine, while hardness was measured by Vickers microhardness testing. The data obtained were analyzed using One-way analysis of variance and the Tukey?s test (p < 0.05). GIC containing Ag and TiO2 nanoparticles significantly improved the CS, DTS, and hardness compared to the control group (p < 0.05). However, the FS was not much affected by the addition of either of the nanoparticles (p >0.05). TiO2 blended GIC demonstrated significantly higher CS (154.20+2.38) and DTS (13.2±0.5 MPa) compared to control 117.2±1.2 MPa and 7.2 ±0.8 MPa, respectively. While Blend of GIC+Ag nanoparticles showed the highest FS (29.0±0.7 MPa). Additionally, the blend of GIC+TiO2 exhibited the highest hardness (90.4±1.1 VHN). Ag and TiO2 blended GICs might guarantee their use in occlusal or higher stress-bearing areas.

scholarly journals The Retentive Strength of Laser-Sintered Cobalt-Chromium-Based Crowns after Pretreatment with a Desensitizing Paste Containing 8% Arginine and Calcium Carbonate

2018 ◽  
Vol 19 (12) ◽  
pp. 4082 ◽  
Author(s):  
Raphael Pilo ◽  
Sharon Agar-Zoizner ◽  
Shaul Gelbard ◽  
Shifra Levartovsky
Keyword(s):  
Calcium Carbonate ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Cobalt Chromium ◽  
Surface Areas ◽  
Standardized Protocol ◽  
Universal Testing ◽  
Adhesive Cement ◽  
Ionomer Cement

The retention of laser-sintered cobalt-chromium (Co-Cr)-based crowns were examined after dentin pretreatment with desensitizing paste containing 8% arginine and calcium carbonate (DP-ACC). Forty lower first molars were prepared using a standardized protocol. The Co-Cr crowns were produced using selective laser melting. The teeth were either pretreated with the desensitizing paste or not pretreated. After one week, each group was cemented with glass ionomer cement (GIC) or zinc phosphate cement (ZPC). Surface areas of the teeth were measured before cementation. After aging, a universal testing machine was used to test the retentive strength of the cemented crown-tooth assemblies. The debonded surfaces of the teeth and crowns were examined at 2.7× magnification. Pretreating the dentin surfaces with the desensitizing paste before cementation with GIC or ZPC did not affect the retention of the Co-Cr crowns. The retention of the GIC group (6.04 ± 1.10 MPa) was significantly higher than that of the ZPC group (2.75 ± 1.25 MPa). The predominant failure mode for the ZPC and the nontreated GIC group was adhesive cement-dentin failure; for the treated GIC group, it was adhesive cement-crown failure. The desensitizing paste can be safely used to reduce post-cementation sensitivity without reducing the retentive strength of Co-Cr crowns cemented with GIC or ZPC.

scholarly journals Comparison of Microhardness and Compressive Strength of Alkasite and Conventional Restorative Materials

2020 ◽  
Vol 47 (3) ◽  
pp. 320-326
Author(s):  
Kunho Lee ◽  
Jongsoo Kim ◽  
Jisun Shin ◽  
Miran Han
Keyword(s):  
Compressive Strength ◽  
Vickers Microhardness ◽  
Composite Resin ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Microhardness Test ◽  
Universal Testing ◽  
Restorative Materials ◽  
Ionomer Cement

The aim of this study was to compare compressive strength and microhardness of recently introduced alkasite restorative materials with glass ionomer cement and flowable composite resin.For each material, 20 samples were prepared respectively for compressive strength and Vickers microhardness test. The compressive strength was measured with universal testing machine at crosshead speed of 1 mm/min. And microhardness was measured using Vickers Micro hardness testing machine under 500 g load and 10 seconds dwelling time at 1 hour, 1 day, 7 days, 14 days, 21 days and 35 days.The compressive strength was highest in composite resin, followed by alkasite, and glass ionomer cement. In microhardness test, composite resin, which had no change throughout experimental periods, showed highest microhardness in 1 hour, 1 day, and 7 days measurement. The glass ionomer cement showed increase in microhardness for 7 days and no difference was found with composite resin after 14 days measurement. For alkasite, maximum microhardness was measured on 14 days, but showed gradual decrease.

scholarly journals Cuspal deflection of directly or indirectly restored teeth

2013 ◽  
Vol 16 (4) ◽  
pp. 34
Author(s):  
Daniel Maranha da Rocha ◽  
João Maurício Ferraz da Silva ◽  
Liliana Gressler May ◽  
Maria Amélia Máximo Araújo ◽  
Rebeca Di Nicoló ◽  
...  
Keyword(s):  
Composite Resin ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Strain Gauges ◽  
Glass Ionomer ◽  
Flowable Composite ◽  
Base Materials ◽  
Universal Testing ◽  
Direct Restoration ◽  
Ionomer Cement

<p><strong>Objective: </strong>The aim of this study was to evaluatethe cuspal deflection of teeth restored directlyand indirectly. <strong>Material and Methods: </strong>Fortysound maxillary premolar teeth were restoredwith composite and different base materials. Widemesial-occlusal-distal cavity preparations wereperformed, with isthmus width of one third of thedistance between the cuspal tips, 3 mm occlusaland a 5 mm interproximal preparation height. Theteeth were divided into 4 groups (n = 10), accordingto the restoration type: G1) GIC-DCR (1 mm glassionomer cement base and direct restoration usingnanoparticulate composite); G2) FL-DCR (1 mm baseof flowable composite resin and direct restorationusing nanoparticulate composite); G3) GIC-ICR(1 mm glass ionomer cement base and indirectrestoration using nanoparticulate composite GICbase); G4) FL-ICR (1 mm base of flowable compositeresin and indirect restoration using nanoparticulatecomposite). The specimens were submitted tocompressive load of 50 N on the buccal and lingualcusps, in a universal testing machine. The lingualcusp microstrain (με) measurements were executedby strain gauges. <strong>Results: </strong>The Kruskal-Wallis (5%)test was used and showed there were no significantdifferences among the microstrain values for the fourstudy groups (G1 = 1250; G2 = 1075; G3 = 1279;G4 = 937). <strong>Conclusion: </strong>It could be concluded thatthe restorative techniques and the bases employeddid not show any influences in cuspal deflection.</p><p>Keywords<br />Base materials; Cuspal defection; Composite resin; Direct restoration; Indirect restoration.</p>

scholarly journals The Effect of Altered pH on Push-Out Bond Strength of Biodentin, Glass Ionomer Cement, Mineral Trioxide Aggregate and Theracal

2015 ◽  
Vol 62 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Sameer Makkar ◽  
Ruchi Vashisht ◽  
Anita Kalsi ◽  
Pranav Gupta
Keyword(s):  
Bond Strength ◽  
Alkaline Medium ◽  
Gold Foil ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Mineral Trioxide Aggregate ◽  
Glass Ionomer ◽  
Human Teeth ◽  
Push Out ◽  
Ionomer Cement

Summary Introduction Throughout the history of dentistry, a wide variety of materials such as gold-foil, silver posts, amalgam, zinc oxide eugenol, glass ionomer cements, mineral trioxide aggregate have been used as retrograde fillings. Altered pH in periapical lesions can affect push-out bond strength of these materials. The aim of this study was to evaluate the effect of altered pH on push-out bond strength of Biodentin, Glass ionomer cement (GIC), Mineral trioxide aggregate (MTA) and Theracal. Material and Methods Forty-eight dentin slices of extracted single-rooted human teeth were sectioned and their canal portion instrumented to achieve a diameter of 1.4 mm. The specimens were then assigned into the four groups (one group for each material) with 12 samples in each group. All groups were further divided into 3 subgroups (with 4 specimens in each subgroup): acidic (butyric acid buffered at pH 6.4), neutral (phosphate buffer saline solution at pH 7.4) and alkaline (buffered potassium hydroxide at pH 8.4). Samples were incubated for 4 days at 37°C in acidic, neutral or alkaline medium. Push-out bond strength was measured using a Universal Testing Machine. The slices were examined under a stereomicroscope to determine the nature of bond failure. Results GIC showed the highest bond strength (33.33MPa) in neutral and acidic medium (26.75MPa) compared to other materials. Biodentin showed the best result in alkaline medium. Conclusion Altered pH level affected push-out bond strength of root end materials. GIC demonstrated good push-out bond strength that increased with decrease of pH whereas newer materials Biodentin and Theracal showed satisfying results in altered pH.

scholarly journals Effect of Luting Cements On the Bond Strength to Turkom-Cera All-Ceramic Material

2018 ◽  
Vol 6 (3) ◽  
pp. 548-553 ◽  
Author(s):  
Bandar M. A. Al–Makramani ◽  
Abdul A. A. Razak ◽  
Mohamed I. Abu–Hassan ◽  
Fuad A. Al–Sanabani ◽  
Fahad M. Albakri
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Resin Cement ◽  
Glass Ionomer ◽  
Luting Cement ◽  
Significant Difference ◽  
All Ceramic ◽  
Ionomer Cement

BACKGROUND: The selection of the appropriate luting cement is a key factor for achieving a strong bond between prepared teeth and dental restorations.AIM: To evaluate the shear bond strength of Zinc phosphate cement Elite, glass ionomer cement Fuji I, resin-modified glass ionomer cement Fuji Plus and resin luting cement Panavia-F to Turkom-Cera all-ceramic material.MATERIALS AND METHODS: Turkom-Cera was used to form discs 10mm in diameter and 3 mm in thickness (n = 40). The ceramic discs were wet ground, air - particle abraded with 50 - μm aluminium oxide particles and randomly divided into four groups (n = 10). The luting cement was bonded to Turkom-Cera discs as per manufacturer instructions. The shear bond strengths were determined using the universal testing machine at a crosshead speed of 0.5 mm/min. The data were analysed using the tests One Way ANOVA, the nonparametric Kruskal - Wallis test and Mann - Whitney Post hoc test.RESULTS: The shear bond strength of the Elite, Fuji I, Fuji Plus and Panavia F groups were: 0.92 ± 0.42, 2.04 ± 0.78, 4.37 ± 1.18, and 16.42 ± 3.38 MPa, respectively. There was the statistically significant difference between the four luting cement tested (p < 0.05).CONCLUSION: the phosphate-containing resin cement Panavia-F exhibited shear bond strength value significantly higher than all materials tested.

scholarly journals Effect of cement types on the tensile strength of metallic crowns submitted to thermocycling

2003 ◽  
Vol 14 (3) ◽  
pp. 193-196 ◽  
Author(s):  
Simonides Consani ◽  
Julie Guzela dos Santos ◽  
Lourenço Correr Sobrinho ◽  
Mário Alexandre Coelho Sinhoreti ◽  
Manoel Damião Sousa-Neto
Keyword(s):  
Tensile Strength ◽  
Zinc Phosphate ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Tensile Load ◽  
Resin Cement ◽  
Glass Ionomer ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

The relationship between metallic cast crowns and tensile strength according to cement types submitted to thermocycling was studied. Seventy-two metallic crowns were cast with Verabond II Ni-Cr alloy and cemented in standardized preparations with 10º tapering. Three types of finishing line (45-degree chamfered, 20-degree bevel shoulder and right shoulder) were made with diamond burs on bovine teeth. Twenty-four metallic crowns in each group were randomly subdivided into three subgroups of 8 samples each according to the cement used: SS White zinc phosphate cement, Vitremer resin-modified glass ionomer cement, and Rely X resin cement and were submitted to thermocycling. Retention was evaluated according to tensile load required to displace the metallic cast crowns from tooth preparations with an Instron testing machine. ANOVA and Tukey's test showed a statistically significant difference among luting materials, with greater results for Rely X resin cement (24.9 kgf) followed by SS White zinc phosphate cement (13.3 kgf) and Vitremer resin-modified glass ionomer cement (10.1 kgf). The finishing line types did not influence the tensile resistance of the crowns fixed with the three cements. Increased tensile resistance of metallic crowns fixed on bovine teeth was obtained with resin cement, independent of the finishing line types.

Retentive Strength of Luting Cements for Stainless Steel Crowns: An in vitro Study

2010 ◽  
Vol 34 (4) ◽  
pp. 309-312 ◽  
Author(s):  
Priya Subramaniam ◽  
Sapna Kondae ◽  
Kamal Kishore Gupta
Keyword(s):  
Stainless Steel ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Resin Cement ◽  
Glass Ionomer ◽  
Adhesive Resin ◽  
Luting Cements ◽  
Resin Modified Glass Ionomer ◽  
To Receive ◽  
Ionomer Cement

The present study evaluated and compared the retentive strength of three luting cements. A total of forty five freshly extracted human primary molars were used in this study. The teeth were prepared to receive stainless steel crowns. They were then randomly divided into three groups, of fifteen teeth each, so as to receive the three different luting cements: conventional glass ionomer, resin modified glass ionomer and adhesive resin. The teeth were then stored in artificial saliva for twenty four hours. The retentive strength of the crowns was determined by using a specially designed Instron Universal Testing Machine (Model 1011). The data was statistically analyzed using ANOVA to evaluate retentive strength for each cement and Tukey test for pair wise comparison. It was concluded that retentive strength of adhesive resin cement and resin modified glass ionomer cement was significantly higher than that of the conventional glass ionomer cement.

Does Addition of Propolis to Glass Ionomer Cement Alter its Physicomechanical Properties? An in Vitro Study

2016 ◽  
Vol 40 (5) ◽  
pp. 400-403 ◽  
Author(s):  
P Subramaniam ◽  
KL Girish Babu ◽  
G Neeraja ◽  
S Pillai
Keyword(s):  
Compressive Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Physicomechanical Properties ◽  
Control Group ◽  
Glass Ionomer ◽  
Experimental Group ◽  
Ionomer Cement

Propolis is a natural resinous substance produced by honey bees. The antimicrobial effects of glass ionomer cement have been shown to improve with the addition of propolis; however its effect on the physicomechanical properties of the cement is not known. Aim: The purpose of this study was to evaluate the compressive strength and solubility of conventional restorative glass ionomer cement following the addition of propolis. Study design: Twenty half cylindrical samples were prepared with conventional restorative glass ionomer cement formed the control group. Another twenty samples were prepared with propolis added to conventional restorative glass ionomer cement formed the experimental group. The compressive strength was assessed using universal testing machine. To assess solubility, the samples were immersed in deionised water at room temperature, for 7 days. The solubility was measured as a difference in the weight of the sample; prior to immersion and following immersion at the end of each day. Results: The control group had a significantly higher mean compressive strength of 146.26 Mpa as compared to the experimental group (135.06 Mpa). The solubility between the groups was significant. Conclusion: In comparison to the control group, incorporation of propolis to conventional restorative glass ionomer cement decreased the compressive strength significantly. The solubility of the cement in the experimental group increased significantly over 7day period as compared to the control group.

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