Evaluation of glass transition temperature and dynamic mechanical properties of autopolymerized hard direct denture reline resins

Takase, Kazuma; Watanabe, Ikuya; Kurogi, Tadafumi; Murata, Hiroshi

doi:10.4012/dmj.2014-277

Cited by 3 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the T g values that exhibit relaxation of the molecular of the materials shifted to a higher temperature at higher frequency. A similar phenomenon has been observed with autopolymerized hard direct denture reline resins [28]. Significant differences were found in the T g values for the acrylic permanent soft liner and tissue conditioner between DSC and DMA (with 6 frequencies), whereas no significant differences were found for the silicone permanent soft liner.…”

Section: Discussionsupporting

confidence: 80%

“…Measurements were performed 5 times for each material. The ends of the specimens were clamped over a span of 15 mm and a strain of 0.05% was applied [28]. The rheological parameters, namely the complex dynamic tensile modulus (E*), tensile storage modulus (E′), tensile loss modulus (E"), and loss tangent (tan δ), are respectively defined as follows [10,16]:…”

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 99%

“…Each specimen was placed into an aluminum pan. The test was conducted 1 hour after the preparation of specimens under a nitrogen purge with a flow rate of 50 mL/min [28]. The scan speed for thermal heating was 10 °C/min and the temperature range was -150 °C to 100 °C.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…The thermal properties, including T g , of materials used for dentures have been previously evaluated using DMA [20 -25], and DSC [22,26,27]. A study on autopolymerized hard direct denture reline resins found that the T g values obtained using DMA were higher than those obtained using DSC [28]. Although the employed method influences the determined T g values of dental materials, there is little information regarding this issue for soft denture liners and tissue conditioners.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of viscoelastic properties, hardness, and glass transition temperature of soft denture liners and tissue conditioner

et al. 2019

Self Cite

View full text Add to dashboard Cite

Soft denture liners and tissue conditioners are widely used for the denture patients to cushion masticatory force and condition abused tissues, respectively. This study assessed methods for the evaluation of the viscoelasticity and glass transition temperature (T g) of the silicone permanent soft liner, acrylic permanent soft liner, and tissue conditioner. Three rheological parameters of storage modulus (E′), loss modulus (E″), and loss tangent (tan δ), T g , and hardness were determined using dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and the Shore A0 hardness test. Five specimens were measured for each material. The time-temperature superposition principle was applied to produce master curves of E′, E″, and tan δ for the tested materials at a reference temperature of 37 °C. The acrylic permanent soft liner and tissue conditioner exhibited viscoelastic behavior and sensitivity to frequency, especially at lower frequencies. The silicone permanent soft liner showed elastic behavior and was frequency-independent. T g for the acrylic permanent soft liner was higher than that for the tissue conditioner, which in turn was higher than that for the silicone permanent soft liner for both DMA and DSC. In DMA, a higher frequency led to higher T g values. A positive linear relationship was found between Shore A0 hardness and E′ values, but not E″ and tan δ values. Shore hardness reflects elasticity, but not viscosity. The results of the present study can be used to improve methods for evaluating the viscoelasticity and T g of soft denture liners and tissue conditioners.

show abstract

Section: Discussionsupporting

confidence: 80%

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 99%

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of viscoelastic properties, hardness, and glass transition temperature of soft denture liners and tissue conditioner

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Daohai Zhang et al [ 26 ] determined, through tanδ peak, the T g of long glass fiber reinforced thermoplastic polyurethane/poly(butylene terephthalate) composites, and they found the T g of these composites to shift in higher temperatures as the frequency was increased. Moreover, the T g of auto polymerized hard direct denture reline resins, determinate through dynamic mechanical analysis, was found to be higher in greater frequencies [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation, Thermal Analysis, and Mechanical Properties of Basalt Fiber/Epoxy Composites

et al. 2020

View full text Add to dashboard Cite

In this study, basalt fiber-reinforced polymer (BFRP) composites with epoxy matrix, 20 layers, and volume fraction of fibers Vf = 53.66%, were prepared by a hand lay-up compression molding combined method. The fabric of the basalt fibers is in twill 2/2 weave. Through dynamic mechanical analysis (DMA), their viscoelastic behavior at elevated temperatures and in various frequencies was explored, whereas thermomechanical analysis (TMA) took part in terms of creep recovery and stress-relaxation tests. Moreover, the glass transition temperature (Tg) of the BFRP composites was determined through the peak of the tanδ curves while the decomposition of the BFRP composites and basalt fibers, in air or nitrogen atmosphere, was explored through thermogravimetric analysis (TGA). The mechanical behavior of the BFRP composites was investigated by tensile and three-point bending experiments. The results showed that as the frequency is raised, the BFRP composites can achieve slightly higher Tg while, under the same circumstances, the storage modulus curve obtains a less steep decrease in the middle transition region. Moreover, the hand lay-up compression molding hybrid technique can be characterized as efficient for the preparation of polymer matrix composites with a relatively high Vf of over 50%. Remarkably, through the TGA experiments, the excellent thermal resistance of the basalt fibers, in the temperature range 30–900 °C, was revealed.

show abstract

Effect of soft liner on clinical implication of tooth supported overdenture

Elawady

Eissa

Esmat

2021

Journal of the Arab Society for Medical Research

View full text Add to dashboard Cite

Background/aim Overdentures are considered as the most preferred treatment modality in patients with few remaining teeth, especially after using different denture liners. The present study aims to compare between the clinical performance of tooth supported overdentures relined with three different types (hard denture liner, silicon soft liner, and acrylic resin based soft liner) regarding modified bleeding index, probing depth, and patient satisfaction. Patients and methods A total of 21 partially edentulous patients with one remaining tooth on each side received overdentures constructed with conventional method after abutment preparation. Then dentures were classified randomly into three groups according to relining material: group I was relined with hard liner, group II was relined with silicon soft liner, and group III was relined with acrylic resin soft liner. All patients were recalled after 1, 3, and 6 months. At recall visits, assessment of the oral health status was performed by measuring probing depth and modified bleeding index by using periodontal probe. Moreover, patient satisfaction was evaluated using Oral Health Impacts Profile-14 questionnaire. Results One-way analysis of variance (ANOVA) was performed to compare among the three groups, which revealed significant difference between them in all follow-up periods regarding modified bleeding index, probing depth, and patient satisfaction, followed by Tukey’s post-hoc test for multiple comparisons, which revealed a significant difference among all groups (P<0.05). On the contrary, comparison was performed between different follow-up periods in each group by repetitive one-way ANOVA test, which revealed a significant difference in all groups regarding modified bleeding index and probing depth, whereas revealed insignificant difference in patient satisfaction. Repetitive one-way ANOVA test was followed by Tukey’s post-hoc test for multiple comparisons, which revealed significant difference between T1 and T2 and between T1 and T3 in all groups regarding modified bleeding index, whereas revealed a significant difference between T1 and T3 in all groups regarding probing depth, but in patient satisfaction, insignificant difference was revealed. Conclusion Acrylic resin soft liner showed the best clinical performance then silicon soft liner followed by hard liner regarding modified bleeding index, probing depth, and patient satisfaction during the follow-up period.

show abstract

Evaluation of glass transition temperature and dynamic mechanical properties of autopolymerized hard direct denture reline resins

Cited by 3 publications

References 28 publications

Evaluation of viscoelastic properties, hardness, and glass transition temperature of soft denture liners and tissue conditioner

Evaluation of viscoelastic properties, hardness, and glass transition temperature of soft denture liners and tissue conditioner

Preparation, Thermal Analysis, and Mechanical Properties of Basalt Fiber/Epoxy Composites

Effect of soft liner on clinical implication of tooth supported overdenture

Contact Info

Product

Resources

About