Structure of dental glass-ionomer cements by confocal fluorescence microscopy and stereomicroscopy

Fano, L.; Fano, Vincenzo; Ma, Wanyun; Yang, Guang; Zhu, Feng

doi:10.1016/s0142-9612(00)00422-1

Cited by 7 publications

(10 citation statements)

References 24 publications

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“…The presence of pores in glass-ionomers microstructure can be attributed to the following factors: air incorporation during powder and liquid hand-mixture that decreases the polymer conversion degree due to inhibition of the setting reaction by the oxygen in the bubbles; placement technique of the material into the tooth cavity where the air bubbles are incorporated or entrapped into the material; and changes in powder/ liquid proportion before mixture [13,14]. A slower mixing can avoid air incorporation by breaking some bubbles [13,15]. Considering dental resin composites, the formation of pores can occur during the manufacturing process [12].…”

Section: Discussionmentioning

confidence: 99%

“…The mechanical properties of the dental materials are influenced by their microstructure. Porosity shows to have a harmful influence on the compressive strength of the material and thus in their clinical performance [11,13,15,31]. Also, the content and molecular weight of polyacids and resins influence the mechanical properties of the glass-ionomer materials.…”

Section: Discussionmentioning

confidence: 99%

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Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

et al. 2015

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The main aim of this study was to evaluate the influence of porosity, microstructure, and chemical composition on the wear and compressive strength of dental glass-ionomer or resin composite. Cylindrical samples (6 9 4 mm) were prepared from a nano-hybrid resin composite (Grandio Ò SO/RC, VOCO), a resin-modified glass ionomer (Vitremer TM /VI, 3 M-ESPE) and a conventional glass ionomer (Ionofil Ò Molar/CO, VOCO). Porosity and topography of the materials were evaluated by optical and scanning electron microscopy (SEM). Roughness was evaluated by R a and R t parameters at 0.1 mm/s under cutoff of 0.8 mm. Then, compressive tests were performed at 1 mm/min. Wear tests were carried out at 20 N, 2.5 mm of displacement, at 1 Hz for 90 min in artificial saliva solution. The results were statistically analyzed with a one-way ANOVA and Tukey's test (p \ 0.05). Resin composite revealed a significantly lower porosity (1.21 ± 0.20 %) than glass-ionomer restoratives (5.69-7.54 %) as well as lower values of R a and R t roughness (p \ 0.05). Also, resin composite showed significantly higher values of mechanical strength (334 ± 15.9 MPa) compared to conventional (78.78 ± 13.30 MPa) or modified glass ionomer (169.50 ± 20.98 MPa) (p \ 0.05). For maximal depth of wear, resin composite also showed significantly lower values than glass ionomer (p \ 0.05). Homogeneous wear morphology was noticed by SEM analyses on glass ionomers in opposition to resin composite. Glass ionomers showed a poor mechanical behavior associated to a high porosity and wear rate when compared to resin composite.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

et al. 2015

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“…[32] On the other hand, the microstructure of the ZI is tailored as a sequence of the acid-base setting reaction. Thus, the included water that primarily exists as a solvent, together with the water delivered by the reaction, may accumulate into ultrafine globules during and after setting and eventually diffuse through the set cement leaving behind pores [33][34][35][36].…”

Section: Discussionmentioning

confidence: 99%

Effect of Thermo-mechanical Cyclic Stresses on Flexural Strength of Two Aesthetic Restoratives with Modified Filler Systems

Bahgat¹,

Alshaia²,

Abdullah³

et al. 2019

SJODR

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Background: Numerous restorations have been used in dentistry to substitute the lost natural tooth structure. In attempts to improve the mechanical properties of glass ionomer, a nano-zirconia reinforced glass ionomer was introduced. The aim of the study was to compare the impact of cyclic stresses on flexural strength of two aesthetics restorative materials. Materials and methods: A nano-hybrid composite resin and a nano-zirconia reinforced glass ionomer were used in this study. A total of 80 specimens, 40 for each restorative were fabricated. In each group, 10 specimens were assigned for each aging condition as following; control, thermo-cyclic stresses, mechanical-cyclic stresses and combined thermomechanical cyclic stresses. Then the specimens were submitted to 3-point loading test using the Universal Testing Machine. Results: In all test conditions, nano-hybrid composite resin showed statistically significant higher mean flexural strength than nano-zirconia reinforced glass ionomer (61.1MPa SD ±17.3, 24.2 MPa SD ± 9.9 P-value <0.001). The control condition showed the highest statistically significant mean flexural strength (59.4 MPa SD± 26.8, P-value<0.001), while the combined condition showed the lowest statistically significant mean of flexural strength (29.7 MPa, SD±15.9, P-value <0.001). Conclusions: Nano-hybrid composite showed superior performance than zirconia reinforced glass ionomer when subjected to cyclic stresses; either thermal, mechanical or combined.

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“…According to some researchers (Covey and Ewoldsen, 2001;Fano et al, 2001;Mitchell and Douglas, 1997;Nomoto and McCabe, 2001;Nomoto et al, 2004;Xie et al, 2000), the manipulation can be manual or mechanical, the last one providing a large pore incorporation.…”

Section: Introductionmentioning

confidence: 99%

Influences of the insertion method in glass ionomer cement porosity

Mata

Pinto

Zuanon

2012

Microscopy Res & Technique

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Structure of dental glass-ionomer cements by confocal fluorescence microscopy and stereomicroscopy

Cited by 7 publications

References 24 publications

Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

Mechanical Strength and Wear of Dental Glass-Ionomer and Resin Composites Affected by Porosity and Chemical Composition

Effect of Thermo-mechanical Cyclic Stresses on Flexural Strength of Two Aesthetic Restoratives with Modified Filler Systems

Influences of the insertion method in glass ionomer cement porosity

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