scholarly journals Resin-modified glass ionomer containing calcium glycerophosphate: physico-mechanical properties and enamel demineralization

2019 ◽  
Vol 27 ◽  
Author(s):  
Sâmia Sass SANTOS ◽  
Alberto Carlos Botazzo DELBEM ◽  
João Carlos Silos MORAES ◽  
José Antônio Santos SOUZA ◽  
Lenara Queiroz Chaves OLIVEIRA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Ionomer ◽  
Enamel Demineralization ◽  
Resin Modified Glass Ionomer ◽  
Calcium Glycerophosphate

Effect of Fluoride on Mechanical Properties of Teeth Demineralized by Use of Orthodontic Appliances

2004 ◽  
Vol 841 ◽  
Author(s):  
Claudia Centeno ◽  
Ulises Ruiz ◽  
Oscar Contreras ◽  
Enrique C. Samano
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Composite Resin ◽  
Longitudinal Section ◽  
Orthodontic Appliances ◽  
Glass Ionomer ◽  
Resin Cements ◽  
Orthodontic Bracket ◽  
Enamel Demineralization ◽  
Resin Modified Glass Ionomer

ABSTRACTThe risk of dental caries increases with the use of orthodontic appliances, and it does not only depend on a patient's oral hygiene. Caries cause teeth enamel demineralization close to the orthodontic bracket. The hardness of the teeth consequently decreases, and they become brittle and loose. The type of adhesive used to fix brackets may or may not reduce enamel demineralization. Previous studies have shown that a resin-modified glass ionomer (RMGI) inhibits demineralization. The purpose of this work is to evaluate the effect of a fluoride-releasing bracket on mechanical properties of dentin and enamel on regions adjacent to orthodontic brackets bonded with RMGI and composite resin cements. The remineralization effect due to fluoride on teeth was assessed by measuring hardness and reduced elastic modulus on dentin, enamel and dentin-enamel junction (DEJ) around the bracket area by nanoindentation methods. Nanoindentation was performed using a TriboScope from Hysitron. For this purpose two sets of polished samples were prepared: one sample was a cut along a longitudinal section and the other one along a cross-section of a tooth with orthodontic treatment using RMGI. Anisotropy in the mechanical properties of the teeth is observed along each direction.

Effect of Fluoride on Mechanical Properties of Teeth Demineralized by Use of Orthodontic Appliances

2004 ◽  
Vol 844 ◽  
Author(s):  
Claudia Centeno ◽  
Ulises Ruiz ◽  
Oscar Contreras ◽  
Enrique C. Samano
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Composite Resin ◽  
Longitudinal Section ◽  
Orthodontic Appliances ◽  
Glass Ionomer ◽  
Resin Cements ◽  
Orthodontic Bracket ◽  
Enamel Demineralization ◽  
Resin Modified Glass Ionomer

ABSTRACTThe risk of dental caries increases with the use of orthodontic appliances, and it does not only depend on a patient's oral hygiene. Caries cause teeth enamel demineralization close to the orthodontic bracket. The hardness of the teeth consequently decreases, and they become brittle and loose. The type of adhesive used to fix brackets may or may not reduce enamel demineralization. Previous studies have shown that a resin-modified glass ionomer (RMGI) inhibits demineralization. The purpose of this work is to evaluate the effect of a fluoride-releasing bracket on mechanical properties of dentin and enamel on regions adjacent to orthodontic brackets bonded with RMGI and composite resin cements. The remineralization effect due to fluoride on teeth was assessed by measuring hardness and reduced elastic modulus on dentin, enamel and dentin-enamel junction (DEJ) around the bracket area by nanoindentation methods. Nanoindentation was performed using a TriboScope from Hysitron. For this purpose two sets of polished samples were prepared: one sample was a cut along a longitudinal section and the other one along a cross-section of a tooth with orthodontic treatment using RMGI. Anisotropy in the mechanical properties of the teeth is observed along each direction.

scholarly journals Structural and long-term mechanical properties from a resin-modified glass ionomer cement after various delays of light-activation

2018 ◽  
Vol 37 (6) ◽  
pp. 874-879 ◽  
Author(s):  
Marianne LAGARDE ◽  
Philippe FRANCOIS ◽  
Stéphane LE GOFF ◽  
Jean-Pierre ATTAL ◽  
Elisabeth DURSUN
Keyword(s):  
Mechanical Properties ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Light Activation ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

scholarly journals Assessment of the mechanical properties of glass ionomer cements for orthodontic cementation

2012 ◽  
Vol 17 (6) ◽  
pp. 154-159 ◽  
Author(s):  
Marcel M. Farret ◽  
Eduardo Martinelli de Lima ◽  
Eduardo Gonçalves Mota ◽  
Hugo Mitsuo S. Oshima ◽  
Gabriela Maguilnik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Strength Tests ◽  
Diametral Tensile Strength

OBJECTIVE: To evaluate the mechanical properties of three glass ionomers cements (GICs) used for band cementation in Orthodontics. METHODS: Two conventional glass ionomers (Ketac Cem Easy mix/3M-ESPE and Meron/Voco) and one resin modified glass ionomer (Multi-cure Glass ionomer/3M-Unitek) were selected. For the compressive strength and diametral tensile strength tests, 12 specimens were made of each material. For the microhardness test 15 specimens were made of each material and for the shear bond strength tests 45 bovine permanent incisors were used mounted in a self-cure acrylic resin. Then, band segments with a welded bracket were cemented on the buccal surface of the crowns. For the mechanical tests of compressive and diametral tensile strength and shear bond strength a universal testing machine was used with a crosshead speed of 1,0 mm/min and for the Vickers microhardness analysis tests a Microdurometer was used with 200 g of load during 15 seconds. The results were submitted to statistical analysis through ANOVA complemented by Tukey's test at a significance level of 5%. RESULTS: The results shown that the Multi-Cure Glass Ionomer presented higher diametral tensile strength (p < 0.01) and compressive strength greater than conventional GICs (p = 0.08). Moreover, Ketac Cem showed significant less microhardness (p < 0.01). CONCLUSION: The resin-modified glass ionomer cement showed high mechanical properties, compared to the conventional glass ionomer cements, which had few differences between them.

scholarly journals Mechanical properties of a resin-modified glass ionomer cement for luting: effect of adding spherical silica filler

2010 ◽  
Vol 29 (3) ◽  
pp. 253-261 ◽  
Author(s):  
Lihua E ◽  
Masao IRIE ◽  
Noriyuki NAGAOKA ◽  
Takashi YAMASHIRO ◽  
Kazuomi SUZUKI
Keyword(s):  
Mechanical Properties ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Silica Filler ◽  
Spherical Silica ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

scholarly journals Efficiency of Amorphous Calcium Phosphate–Containing Orthodontic Composite and Resin Modified Glass Ionomer on Demineralization Evaluated By a New Laser Fluorescence Device

2009 ◽  
Vol 03 (02) ◽  
pp. 127-134 ◽  
Author(s):  
Tancan Uysal ◽  
Mihri Amasyali ◽  
Alp Erdin Koyuturk ◽  
Deniz Sagdic
Keyword(s):  
Calcium Phosphate ◽  
Amorphous Calcium Phosphate ◽  
Glass Ionomer Cement ◽  
Laser Fluorescence ◽  
Orthodontic Brackets ◽  
Glass Ionomer ◽  
Enamel Demineralization ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer

ABSTRACTObjectives: The aim of this in vitro study was to compare the efficacy of Amorphous Calcium Phosphate (ACP)-containing orthodontic composite and resin-modified glass ionomer cement (RMGIC) on enamel demineralization adjacent to orthodontic brackets evaluated by a new laser fluorescence device.Methods: Sixty extracted maxillary premolars were used in the present study. Twenty orthodontic brackets were bonded with ACP-containing orthodontic adhesive (Aegis-Ortho), 20 were bonded with RMGIC (Fuji Ortho LC) ad20 were bonded with Transbond XT composite as the control. All samples were then cycled for 21 days through a daily procedure of demineralization for 6 hours and remineralization for 17 hours. After this procedure, demineralization evaluations were undertaken by a pen-type laser fluorescence device (DIAGNO-dent Pen). Analysis ofvariance (ANOVA) and Tukey test was used for statistical evaluation, at P<.05 level.Results: According to ANOVA, significant demineralization variations (ΔD) were determined among groups (F=6.650; P<.01). The ACP-containing composite showed the lowest (mean: 8.98±2.38) and the control composite showed the highest (mean:12.15±3.83) ΔD, during 21 days demineralization process (P<.01). Significant difference was also observed between the ΔD scores of the RMGIC (mean: 9.24±2.73) and control (P<.05).No significant differences was found in preventive effects of ACP-containing composite and RMGIC (P<.05) against demineralization.Conclusions: The use of both ACP-containing orthodontic composite and RMGIC should be recommended for any at-risk orthodontic patient to provide preventive actions and potentially remineralize subclinical enamel demineralization. (Eur J Dent 2009;3:127-134)

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