Physical and chemical properties of model composites containing quaternary ammonium methacrylates

Vidal, Marina Lermenn; Rego, Guilherme Ferreira; Viana, Gil Mendes; Cabral, Lúcio Mendes; Souza, Juliana Primo Basílio de; Silikas, Nick; Schneider, Luís Felipe Jochims; Cavalcante, Larissa Maria

doi:10.1016/j.dental.2017.09.020

Cited by 40 publications

(37 citation statements)

References 48 publications

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“…Another important question when polymerizing big increments consists in the polymerization shrinkage. Usually, volumetric shrinkage is assessed through bidimensional measurements and conversion of values estimating the volume 16,17) . With the use of new technologies such as µ-CT, it is possible to assess the real volumetric shrinkage of the resin composites 19) .…”

Section: Discussionmentioning

confidence: 99%

“…Volumetric shrinkage is a tridimensional phenomenon although being usually assessed through bidimensional methods and conversion/estimation of tridimensional changes [16][17][18] . With the development of new technologies such as X-ray micro computed tomography (µ-CT), tridimensional analysis of the volumetric shrinkage might be simpler and reliable 19) .…”

Section: Introductionmentioning

confidence: 99%

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Polymerization shrinkage, microhardness and depth of cure of bulk fill resin composites

et al. 2019

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymerization shrinkage, microhardness and depth of cure of bulk fill resin composites

et al. 2019

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“…of PHMGH contributes to a suitable DC due to the greater chain mobility of the base resin compared to resins with quaternary ammonium compounds with longer alkyl chain. 37 Furthermore, the refractive index of PHMGH (poly (hexamethylene biguanide) hydrochloride -1.5486 38 ) is similar to the index of the co-monomer blend (mixture of BisGMA, TEGDMA, and HEMA -1.47 to 1.59 (monomer) and 1.50-1.62 (polymer) 18 ). Because of the similar refractive index between the base resin and the material incorporated, the light energy availability is less susceptible to reduction, which probably contributed to the similar DC among groups.…”

Section: Discussionmentioning

confidence: 92%

Antibacterial, chemical and physical properties of sealants with polyhexamethylene guanidine hydrochloride

et al. 2019

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The aim of this study was to evaluate the influence of polyhexamethylene guanidine hydrochloride (PHMGH) in the physicochemical properties and antibacterial activity of an experimental resin sealant. An experimental resin sealant was formulated with 60 wt.% of bisphenol A glycol dimethacrylate and 40 wt.% of triethylene glycol dimethacrylate with a photoinitiator/co-initiator system. PHMGH was added at 0.5 (G 0.5%), 1 (G 1%), and 2 (G 2%) wt.% and one group remained without PHMGH, used as control (G CTRL). The resin sealants were analyzed for degree of conversion (DC), Knoop hardness (KHN), and softening in solvent (ΔKHN), ultimate tensile strength (UTS), contact angle (θ) with water or α-bromonaphthalene, surface free energy (SFE), and antibacterial activity against Streptococcus mutans for biofilm formation and planktonic bacteria. There was no significant difference for DC (p > 0.05). The initial Knoop hardness ranged from 17.30 (±0.50) to 19.50 (± 0.45), with lower value for G CTRL (p < 0.05). All groups presented lower KHN after immersion in solvent (p < 0.05). The ΔKHN ranged from 47.22 (± 4.30) to 57.22 (± 5.42)%, without significant difference (p > 0.05). The UTS ranged from 54.72 (± 11.05) MPa to 60.46 (± 6.50) MPa, with lower value for G 2% (p < 0.05). PHMGH groups presented no significant difference compared to G CTRL in θ (p > 0.05). G 2% showed no difference in SFE compared to G CTRL (p > 0.05). The groups with PHMGH presented antibacterial activity against biofilm and planktonic bacteria, with higher antibacterial activity for higher PHMGH incorporation (p < 0.05). PHMGH provided antibacterial activity for all resin sealant groups and the addition up to 1 wt.% showed reliable physico-chemical properties, maintaining the caries-protective effect of the resin sealant over time.

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“…The specimens of dental resins were submitted to tensile strength until fracture in a universal testing machine with no statistical difference among groups. The UTS was a promising outcome because the incorporation of antibacterial agents could lead to lower mechanical properties [36]. The dental resins formulated in this study may be used in occlusal surfaces, where repetitive chewing stress is applied.…”

Section: Discussionmentioning

confidence: 99%

Myristyltrimethylammonium Bromide (MYTAB) as a Cationic Surface Agent to Inhibit Streptococcus mutans Grown over Dental Resins: An In Vitro Study

Nunes

et al. 2020

JFB

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This in vitro study evaluated the effect of myristyltrimethylammonium bromide (MYTAB) on the physical, chemical, and biological properties of an experimental dental resin. The resin was formulated with dental dimetacrylate monomers and a photoinitiator/co-initiator system. MYTAB was added at 0.5 (G 0.5% ), 1 (G 1% ), and 2 (G 2% ) wt %, and one group remained without MYTAB and was used as the control (G Ctrl ). The resins were analyzed for the polymerization kinetics, degree of conversion, ultimate tensile strength (UTS), antibacterial activity against Streptococcus mutans, and cytotoxicity against human keratinocytes. Changes in the polymerization kinetics profiling were observed, and the degree of conversion ranged from 57.36% (±2.50%) for G 2% to 61.88% (±1.91%) for G 0.5% , without a statistically significant difference among groups (p > 0.05). The UTS values ranged from 32.85 (±6.08) MPa for G 0.5% to 35.12 (±5.74) MPa for G Ctrl (p > 0.05). MYTAB groups showed antibacterial activity against biofilm formation from 0.5 wt % (p < 0.05) and against planktonic bacteria from 1 wt % (p < 0.05). The higher the MYTAB concentration, the higher the cytotoxic effect, without differences between G Ctrl e G 0.5% (p > 0.05). In conclusion, the addition of 0.5 wt % of MYTAB did not alter the physical and chemical properties of the dental resin and provided antibacterial activity without cytotoxic effect.

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Physical and chemical properties of model composites containing quaternary ammonium methacrylates

Abstract: In general, the addition of QAS increased composite's degradation compared with the CG. In the tested QAS, the addition of DMADDM at 5% concentration resulted in a less degradable material.

Cited by 40 publications

References 48 publications

Polymerization shrinkage, microhardness and depth of cure of bulk fill resin composites

Polymerization shrinkage, microhardness and depth of cure of bulk fill resin composites

Antibacterial, chemical and physical properties of sealants with polyhexamethylene guanidine hydrochloride

Myristyltrimethylammonium Bromide (MYTAB) as a Cationic Surface Agent to Inhibit Streptococcus mutans Grown over Dental Resins: An In Vitro Study

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