In vitro hardness, water sorption, and resin solubility of laboratory-processed and autopolymerized long-term resilient denture liners over one year of water storage

Parr, Gregory R.; Rueggeberg, Frederick A.

doi:10.1067/mpr.2002.127399

Cited by 61 publications

(75 citation statements)

References 8 publications

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“…Therefore, it is desirable that these materials have a low hardness (17). Maintaining a satisfactory hardness is one of the most complicated factors for denture acrylic lining materials, because they are not stable in an aqueous medium (24). In their life cycle, these materials are immersed in saliva, food, water and hygiene solutions, which are responsible for leaching of components or sorption of fluids (3).…”

Section: Discussionmentioning

confidence: 99%

“…After this, the specimens were separated from the molds and the edges were carefully smoothed with a scalpel (14). Specimens were then individually immersed in 17.5 mL of distilled water at 37 °C (MA 0324; Marconi Equipamentos para Laboratórios Ltda., Piracicaba, SP, Brazil) for 24 h, 7 days or 14 days (12,24) prior to the hardness/roughness measurements. Since the hardness measurement test does no allow reusing the samples, only independent specimens were fabricated in each evaluation period of the present study.…”

Section: Methodsmentioning

confidence: 99%

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Surface Properties of Temporary Soft Liners Modified by Minimum Inhibitory Concentrations of Antifungals

et al. 2017

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albicans biofilm on the hardness and roughness of temporary denture soft liners. Specimens (n=8; 36×7×6 mm) of tissue conditioner (Softone) and resilient liner (Trusoft) were produced either without (control) or with incorporation of drugs at MICs: nystatin (0.032 g/mL), chlorhexidine diacetate (0.064 g/mL), ketoconazole (0.128 g/mL), miconazole (0.256 g/mL) and itraconazole (0.256 g/mL). Specimens were stored in distilled water at 37 °C for 24 h, 7 days and 14 days prior to the hardness/roughness measurements. Data were analyzed by 3-way ANOVA and Tukey HSD test (α=0.05). The addition of the antifungals into both materials demonstrated no evident hardness change or decrease of this property compared with the control, except for miconazole in Softone, which increased the hardness after 14 days (p=0.003). The addition of nystatin into both materials, chlorhexidine in Trusoft and ketoconazole in Softone resulted in no significant changes of roughness compared with the control, after 7 days and 14 days (p>0.05). In these periods, itraconazole increased the roughness of both materials (p<0.001). The addition of all antifungals, except for the miconazole in Softone, resulted in no deleterious effects on the materials' hardness over the evaluation time. The MICs of nystatin in both temporary soft lining materials, ketoconazole in Softone and chlorhexidine in Trusoft resulted in no deleterious effects for roughness up to 14 days.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Surface Properties of Temporary Soft Liners Modified by Minimum Inhibitory Concentrations of Antifungals

et al. 2017

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“…After polymerization of the disk shaped samples with the liners, the samples were dried in the desiccator at 37ºC for 7 days. After storage interval of 1 week, the samples were removed and overt moisture on the surface was removed quickly, 26,27 as shown in Figure 3, and each sample was weighed in the electronic weighing machine. The water sorption value was determined by initial weight of the desiccated sample and weight after the sample has been saturated divided by the surface area and expressed in mgm/cm 2 .…”

Section: Methodsmentioning

confidence: 99%

Comparative Evaluation of Heat-Polymerized and Auto-Polymerized Soft Liners with Regard to Transverse Bond Strength, Peel Bond Strength and Water Sorption: An in vitro Study

Krishnappan¹,

Jaiesh²,

Swaminathan³

2014

International Journal of Prosthodontics and Restorative Dentistry

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Purpose: This is an in vitro study for comparative evaluation of transverse bond strength, peel bond strength and water sorption properties between heat polymerized and auto-polymerized resins. Materials and methods:Two denture soft liners (Molloplast-B, Coe-Soft) were investigated. A total number of 60 specimens were used. Twenty specimens were used for evaluation of each physical property of soft liner. For transverse bond strength, ten specimens (64 × 2.5 × 10 mm) of each liner were made by processing the denture liners with heat cure polymethyl methacrylate (Meliodent). All specimens for transverse bond strength were conducted on samples immersed in distilled water at 37°C for 50 hours by using three-point transverse flexural tests in a Lloyd's Universal Testing Machine and transverse bond strength was calculated based on the maximum load, span length, breadth and thickness. Another set of ten specimens of (75 × 25 × 3 mm) of each denture liner were bonded over 25 mm of heat cure PMMA and separated over the remaining 50 mm of acrylic plate to estimate the peel bond strength. The peel bond strength were conducted on specimens which were dried at room temperature for 48 hours and tested at 21 ± 1°C in a Lloyd's testing machine that was linked to an IBM Compatible Computer. The specimens were deformed with a cross head speed of 5 mm/minute according to ASTMD-903 and peel bond strength was calculated when peel angle was 180°. For water sorption tests, ten disc shaped samples of each liner of 50 mm in diameter and 0.5 mm in thickness were fabricated. After polymerization of the liners, the samples were then stored in distilled water at 37°C for 7 days. After one week, excess moisture was removed and each sample was weighed using electronic weighing machine. Results:The transverse bond strength of Molloplast-B and Coe-Soft were almost similar and did not show any significant difference in their values. But, there is a significant decrease in the peel bond strength and water sorption property of Molloplast-B and Coe-Soft. Conclusion:The reason for transverse bond strength results being similar for both the liners is because they were polymerized chemically with the denture base resins and this chemical affinity could have made its bond strength almost equal. Since, there is a decrease in the peel bond strength of Molloplast-B, the chances of stripping of the liner at the flanges of the denture is minimal. The decrease in water sorption of Molloplast-B can be expected to retain the bond with the denture and sustain the resilience property of the material for a longer time.

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“…Acrylic resin-based materials display differences in their surface hardness levels (Parr & Rueggeberg, 2002;Azevedo et al, 2005;Bindo et al, 2009 andPinto et al, 2010). Denture base surfaces with different hardness levels, in turn, may be influenced differently by mechanical and chemical cleaning procedures.…”

Section: Discussionmentioning

confidence: 99%

Surface Hardness of Acrylic Resins Exposed to Toothbrushing, Chemical Disinfection and Thermocycling

Lira¹,

Leonardo

Consani³

et al. 2014

DENT

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The aim of this study is to investigate the effect of the toothbrushing, chemical disinfection and thermocycling treatments on the surface hardness of acrylic resins used for denture bases. The Classico (conventional), Onda Cryl (microwaved) and QC-20 (boiled) thermoactivated acrylic resins were used to prepare specimens. Prior to and after cleaning procedures, the specimens were submitted to a hardness test in an indenter (HMV-2000 Shimadzu), employing a load of 50 gf for 10 s. Three-way ANOVA and Tukey's test (α=0.05) were used to analyze the data. Prior to thermocycling, statistical differences were found among treatments for Onda Cryl, with greater hardness values observed for Efferdent and hypochlorite; lower hardness value was obtained after toothbrushing, and intermediate value was found for the control. Differences were found among resins for the control treatment, with higher value for QC-20 resin, lower value for the Classico, and intermediate value for the Onda Cryl. Following thermocycling, differences were observed among treatments for Onda Cryl, with control specimens presenting higher values, lower value for toothbrushing and intermediate values for Efferdent and hypochlorite. Differences were also found for QC-20, with Efferdent and hypochlorite presenting higher values, lower value for control and intermediate value for toothbrushing. Differences were found among resins for the control treatment, with higher value for Onda Cryl resin, lower value for the QC-20, and intermediate value for the Classico. The QC-20 resin showed higher value for control prior to thermocycling and Onda Cryl after thermocycling. Different effects on the surface hardness of acrylic resins used for denture bases were observed when associating thermocycling with toothbrushing or chemical disinfections.

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In vitro hardness, water sorption, and resin solubility of laboratory-processed and autopolymerized long-term resilient denture liners over one year of water storage

Cited by 61 publications

References 8 publications

Surface Properties of Temporary Soft Liners Modified by Minimum Inhibitory Concentrations of Antifungals

Surface Properties of Temporary Soft Liners Modified by Minimum Inhibitory Concentrations of Antifungals

Comparative Evaluation of Heat-Polymerized and Auto-Polymerized Soft Liners with Regard to Transverse Bond Strength, Peel Bond Strength and Water Sorption: An in vitro Study

Surface Hardness of Acrylic Resins Exposed to Toothbrushing, Chemical Disinfection and Thermocycling

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