Effects of Thermocycling on the Tensile Bond Strength of Three Permanent Soft Denture Liners

Botega, Daniela Maffei; Sanchez, Jose Luiz Lopes; Mesquita, Marcelo Ferraz; Henriques, Guilherme Elias Pessanha; Consani, Rafael Leonardo Xediek

doi:10.1111/j.1532-849x.2008.00342.x

Cited by 36 publications

(42 citation statements)

References 16 publications

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“…1,2 Patients who have alveolar ridge resorption, bruxism, thin and nonresilient mucosa, and areas of severe undercuts may benefit from the use of soft lining materials in their prostheses. 3,4 There are two types…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Surface Treatments and Thermocycling on Bond Strength of a Silicone-based Denture Liner to a Denture Base Resin

Nakhaei¹,

Dashti²,

Ahrari³

et al. 2016

The Journal of Contemporary Dental Practice

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Aim:The aim of this study is to evaluate the effects of three different surface treatments and thermocycling on the tensile strength of a silicone lining material to denture resin. Materials and methods:A total of 96 cube-shaped specimens were fabricated using heat-cured polymethyl methacrylate (PMMA) denture base resin. Three millimeters of the material was cut from the midsection. The specimens were divided into four groups. The bonding surfaces of the specimens in each group received one of the following surface treatments: no surface treatment (control group), airborne particle abrasion with 110 µm alumina particles (air abrasion group), Er:yttrium aluminum garnet laser irradiation (laser group), and air abrasion + laser. After the lining materials were processed between the two PMMA blocks, each group was divided into two subgroups (n = 12), either stored in distilled water at 37ºC for 24 hours or thermocycled between 5 and 55ºC for 5,000 cycles. The specimens were tested in tensile and shear strength in a universal testing machine. Data were analyzed with two-way analysis of variance and Tamhane's post hoc tests (α = 0.05). The mode of failure was determined, and one specimen in each group was examined by scanning electron microscopy. Effect of Different Results:Surface-treated groups demonstrated significantly higher tensile strengths compared to the control group (p < 0.001). Nonetheless, no significant differences were found between surface-treated groups (p > 0.05). The tensile strength was significantly different between thermocycled and waterstored specimens (p = 0.021). Conclusion:Altering the surface of the acrylic denture base resin with air abrasion, laser, and air abrasion + laser increased the tensile strength. Thermocycling resulted in decrease in bond strength of silicone-based liner to surface-treated acrylic resin.Clinical significance: Pretreatment of denture base resins before applying the soft liner materials improves the bond strength. However, thermocycling results in decrease in bond strength of soft denture liner to surface-treated acrylic resin.

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Section: Introductionmentioning

confidence: 99%

Effect of Different Surface Treatments and Thermocycling on Bond Strength of a Silicone-based Denture Liner to a Denture Base Resin

Nakhaei¹,

Dashti²,

Ahrari³

et al. 2016

The Journal of Contemporary Dental Practice

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“…Antimicrobial solution immersion may result in discoloration, increased roughness and hardness of silicone, accelerated release of monomer and plasticizer of denture base material [6][7][8]. Declined physical properties, accelerated aging and lower adhesion with denture base could result from microwave disinfection [9,10]. Therefore, the ideal way to solve the problem of bacterial contamination is adding antimicrobial components to soft lining material to make the material itself obtain certain antimicrobial capacity.…”

Section: Discussionmentioning

confidence: 99%

Dispersibility of SZP Antimicrobial Agents in Silicone Denture Soft Lining Materials and Their Effect on Operational Performance

Sui¹,

Liu²,

Li³

2010

2010 4th International Conference on Bioinformatics and Biomedical Engineering

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The purpose of this study is to investigate the dispersibility of silver-zirconium phosphate (SZP) nanoinorganic antimicrobial agent in silicone denture soft lining materials and the effect of adding the agent on operational performances. SZP was added using the method of high shear emulsification dispersion. The mass percent of antimicrobial agent was 2%, 5%, and 10%. Silicone soft lining materials without antimicrobial agent served as controls. Dispersibility of SZP in silicone soft lining materials was observed under scanning electron microscope (SEM), and the attribution of the elements on the cross section was analyzed by energy dispersive analysis system (EDS). Operational properties of materials with and without SZP were tested to find out the effect of adding SZP on these properties, including mixing time, consistency, working time and setting time. By SEM observation, inorganic nanogranules were well-distributed in silicone substrate. Element analysis showed even distribution of Zr and Ag, which confirmed there were not obvious nano-agglomerates, and in turn verified the excellent dispersibility of SZP in tested silicone materials. EDS spectra showed that the mass proportion of Zr in samples containing 5% SZP was low, suggesting the main content was still silicon compound. Adding SZP by the proportions mentioned above prolonged mixing time of the material, i.e. the easy-mixed capability of the material was decreased. But consistency, working time and setting time of the material were not significantly affected. The method of high shear emulsification dispersion is capable to make SZP nano-inorganic antimicrobial agent distribute evenly in silicone soft lining substrate, without obvious agglomeration. Adding SZP will not significantly affect operational properties of silicone denture soft lining material.

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“…This in vitro study simulated the use of temporary restorations for a period of three years, since each 1000 thermocycling represent the use of a fixed prosthesis for one year 22 . Storage in water during 24 hours was tested because in the indirect fabrication technique, temporary restorations should remain stored in water until cementation onto the tooth preparations.…”

Section: Discussionmentioning

confidence: 99%

Effect of storage in water and thermocycling on hardness and roughness of resin materials for temporary restorations

et al. 2010

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Purpose: This study evaluated the effect of storage in water and thermocycling on hardness and roughness of resin materials for temporary restorations. Material and Methods: Three acrylic resins (Dencor-De, Duralay-Du, and Vipi Cor-VC) were selected and one composite resin (Opallis-Op) was used as a parameter for comparison. The materials were prepared according to the manufacturers' instructions and were placed in stainless steel moulds (20 mm in diameter and 5 mm thick). Thirty samples of each resin were made and divided into three groups (n = 10) according to the moment of Vickers hardness (VHN) and roughness (Ra) analyses: C (control group): immediately after specimen preparation; Sw: after storage in distilled water at 37 °C for 24 hours; Tc: after thermocycling (3000 cycles; 5-55 °C, 30 seconds dwell time). Data were submitted to 2-way ANOVA followed by Tukey's test (α = 0.05). Results: Op resin had higher surface hardness values (p < 0.0001; 25.4 ± 3.4) than the other ones (De = 4.5 ± 0.6; Du = 5.5 ± 0.4; VC = 6.1 ± 0.9). There was no statistical difference (p > 0.05) in roughness among materials (De = 0.31 ± 0.07; Du = 0.51 ± 0.20; VC = 0.41 ± 0.15; Op = 0.42 ± 0.18). Storage in water did not change hardness and roughness of the tested materials (p > 0.05). There was a significant increase in roughness after thermocycling (p < 0.05), except for material Du, which showed no significant change in roughness in any evaluated period (p = 0.99). Conclusion: Thermocycling increased the roughness in most tested materials without affecting hardness, while storage in water had no significant effect in the evaluated properties.

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Effects of Thermocycling on the Tensile Bond Strength of Three Permanent Soft Denture Liners

Abstract: Despite presenting greater bond strength, thermocycling had a deleterious effect in Dentuflex; Ufi-gel may be adequate for short-term use.

Cited by 36 publications

References 16 publications

Effect of Different Surface Treatments and Thermocycling on Bond Strength of a Silicone-based Denture Liner to a Denture Base Resin

Effect of Different Surface Treatments and Thermocycling on Bond Strength of a Silicone-based Denture Liner to a Denture Base Resin

Dispersibility of SZP Antimicrobial Agents in Silicone Denture Soft Lining Materials and Their Effect on Operational Performance

Effect of storage in water and thermocycling on hardness and roughness of resin materials for temporary restorations

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