Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Modification of conventional glass-ionomer cements with N-vinylpyrrolidone containing polyacids, nano-hydroxy and fluoroapatite to improve mechanical properties
AU - Moshaverinia, A.
AU - Ansari, S.
AU - Movasaghi, Z.
AU - Billington, R.W.
AU - Darr, J.A.
AU - Rehman, I.U.
PY - 2008
Y1 - 2008
N2 - Objective: The objective of this study was to enhance the mechanical strength of glass-ionomer cements, while preserving their unique clinical properties. Methods: Copolymers incorporating several different segments including N-vinylpyrrolidone (NVP) in different molar ratios were synthesized. The synthesized polymers were copolymers of acrylic acid and NVP with side chains containing itaconic acid. In addition, nano-hydroxyapatite and fluoroapatite were synthesized using an ethanol-based sol-gel technique. The synthesized polymers were used in glass-ionomer cement formulations (Fuji II commercial GIC) and the synthesized nanoceramic particles (nano-hydroxy or fluoroapatite) were also incorporated into commercial glass-ionomer powder, respectively. The synthesized materials were characterized using FTIR and Raman spectroscopy and scanning electron microscopy. Compressive, diametral tensile and biaxial flexural strengths of the modified glass-ionomer cements were evaluated. Results: After 24 h setting, the NVP modified glass-ionomer cements exhibited higher compressive strength (163-167 MPa), higher diametral tensile strength (DTS) (13-17 MPa) and much higher biaxial flexural strength (23-26 MPa) in comparison to Fuji II GIC (160 MPa in CS, 12 MPa in DTS and 15 MPa in biaxial flexural strength). The nano-hydroxyapatite/fluoroapatite added cements also exhibited higher CS (177-179 MPa), higher DTS (19-20 MPa) and much higher biaxial flexural strength (28-30 MPa) as compared to the control group. The highest values for CS, DTS and BFS were found for NVP-nanoceramic powder modified cements (184 MPa for CS, 22 MPa for DTS and 33 MPa for BFS) which were statistically higher than control group. Conclusion: It was concluded that, both NVP modified and nano-HA/FA added glass-ionomer cements are promising restorative dental materials with improved mechanical properties. © 2008 Academy of Dental Materials.
AB - Objective: The objective of this study was to enhance the mechanical strength of glass-ionomer cements, while preserving their unique clinical properties. Methods: Copolymers incorporating several different segments including N-vinylpyrrolidone (NVP) in different molar ratios were synthesized. The synthesized polymers were copolymers of acrylic acid and NVP with side chains containing itaconic acid. In addition, nano-hydroxyapatite and fluoroapatite were synthesized using an ethanol-based sol-gel technique. The synthesized polymers were used in glass-ionomer cement formulations (Fuji II commercial GIC) and the synthesized nanoceramic particles (nano-hydroxy or fluoroapatite) were also incorporated into commercial glass-ionomer powder, respectively. The synthesized materials were characterized using FTIR and Raman spectroscopy and scanning electron microscopy. Compressive, diametral tensile and biaxial flexural strengths of the modified glass-ionomer cements were evaluated. Results: After 24 h setting, the NVP modified glass-ionomer cements exhibited higher compressive strength (163-167 MPa), higher diametral tensile strength (DTS) (13-17 MPa) and much higher biaxial flexural strength (23-26 MPa) in comparison to Fuji II GIC (160 MPa in CS, 12 MPa in DTS and 15 MPa in biaxial flexural strength). The nano-hydroxyapatite/fluoroapatite added cements also exhibited higher CS (177-179 MPa), higher DTS (19-20 MPa) and much higher biaxial flexural strength (28-30 MPa) as compared to the control group. The highest values for CS, DTS and BFS were found for NVP-nanoceramic powder modified cements (184 MPa for CS, 22 MPa for DTS and 33 MPa for BFS) which were statistically higher than control group. Conclusion: It was concluded that, both NVP modified and nano-HA/FA added glass-ionomer cements are promising restorative dental materials with improved mechanical properties. © 2008 Academy of Dental Materials.
KW - Free radical polymerization
KW - Glass-ionomer cements
KW - Mechanical properties
KW - N-Vinylpyrrolidone
KW - Nano-hydroxyapatite
KW - Nanofluoroapatite
KW - Reinforcement
KW - Sol-gel technique
KW - Synthesis
KW - Architectural acoustics
KW - Bending strength
KW - Blood vessel prostheses
KW - Bone cement
KW - Canning
KW - Carboxylic acids
KW - Cement manufacture
KW - Cements
KW - Colloids
KW - Compressive strength
KW - Copolymerization
KW - Copolymers
KW - Dental materials
KW - Dental prostheses
KW - Electric frequency control
KW - Electronic medical equipment
KW - Ethanol
KW - Fourier transform infrared spectroscopy
KW - Gelation
KW - Glass
KW - Health
KW - Hydroxyapatite
KW - Ice
KW - Imaging techniques
KW - Intercalation
KW - Materials properties
KW - Organic acids
KW - Plastic products
KW - Polymers
KW - Powders
KW - Strength of materials
KW - Acrylic acid (PS-PAA)
KW - Bi axial flexural strength
KW - Commercial glasses
KW - Control Group (CON)
KW - Diametral tensile strength (DTS)
KW - Fluoroapatite (FA)
KW - Glass ionomer cement (GIC)
KW - Ionomer
KW - Itaconic acid (PIA)
KW - Mechanical strengths
KW - Molar ratios
KW - N vinyl pyrrolidone (NPV)
KW - Nano ceramics
KW - Nano-hydroxyapatite (n-HA)
KW - Nanoceramic powder
KW - Polyacids
KW - Side chains
KW - Sol-gel techniques
KW - Strength (IGC: D5/D6)
KW - Synthesized materials
KW - Synthesized polymers
KW - Dental cement
KW - 1 vinyl 2 pyrrolidinone
KW - 2 pyrrolidone derivative
KW - acrylic acid resin
KW - alcohol
KW - apatite
KW - biomaterial
KW - carbopol 940
KW - fluorapatite
KW - Fuji glass ionomer lining cement
KW - Fuji glass-ionomer lining cement
KW - glass ionomer
KW - hydroxyapatite
KW - itaconic acid
KW - itaconic acrylic acid copolymer
KW - itaconic-acrylic acid copolymer
KW - N-vinyl-2-pyrrolidinone
KW - nanoparticle
KW - polymer
KW - solvent
KW - succinic acid derivative
KW - unclassified drug
KW - article
KW - chemistry
KW - comparative study
KW - compressive strength
KW - human
KW - infrared spectroscopy
KW - materials testing
KW - mechanical stress
KW - phase transition
KW - pliability
KW - Raman spectrometry
KW - scanning electron microscopy
KW - tensile strength
KW - time
KW - Acrylic Resins
KW - Apatites
KW - Biocompatible Materials
KW - Compressive Strength
KW - Durapatite
KW - Glass Ionomer Cements
KW - Humans
KW - Materials Testing
KW - Microscopy, Electron, Scanning
KW - Nanoparticles
KW - Phase Transition
KW - Pliability
KW - Pyrrolidinones
KW - Solvents
KW - Spectroscopy, Fourier Transform Infrared
KW - Spectrum Analysis, Raman
KW - Stress, Mechanical
KW - Succinates
KW - Tensile Strength
KW - Time Factors
U2 - 10.1016/j.dental.2008.03.008
DO - 10.1016/j.dental.2008.03.008
M3 - Journal article
VL - 24
SP - 1381
EP - 1390
JO - Dental Materials
JF - Dental Materials
SN - 0109-5641
IS - 10
ER -