An experimental and theoretical study of the effect of sample thickness on the Shore hardness of elastomers

Siddiqui, Adel Zia; Braden, M.; Patel, Mukesh R.; Parker, Sandra

doi:10.1016/j.dental.2010.02.004

Cited by 37 publications

(21 citation statements)

References 6 publications

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“…In both cases, the presence of Zr within the nanocomposite network led to significantly improved mechanical properties; and an E value of 23 MPa was achieved. Thus, the mechanical properties of the material system examined in this study were in general comparable with those reported in the associated literature indicating a potential opportunity for them to be utilized in dental restoration/adhesion applications. However, these mechanical properties have to be improved so these material systems could be considered as practically reliable alternatives to those available commercially.…”

Section: Discussionsupporting

confidence: 77%

“…Nonetheless, one can use the data obtained from hardness measurements to gain a general idea about the mechanical properties of the system. The system with Zr appeared to have comparably high mechanical properties with respect to those in the associated literature .…”

Section: Resultsmentioning

confidence: 79%

“…To assess the mechanical properties of the materials produced, Shore‐A‐type‐hardness tests were carried out. Shore‐A‐type‐hardness is not only important for practical applications of materials of this type, but can also be used to gain insight into the further mechanical properties such as elastic (Young's) modulus ( E ) as reported in the corresponding literature . As a result of the hardness measurements as well as the corrections/calculations presented therein, the values shown in Table were obtained for the Zr‐containing materials cured by UV light (shown along with data obtained from the system with Ti ).…”

Section: Resultsmentioning

confidence: 97%

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Synthesis and characterization of a Zr‐containing silicate‐based epoxy‐functional polymer nanocomposite system

Çopuroğlu

Şen

2014

Polymer Engineering & Sci

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As a continuation of efforts to explore the potential of certain types of polymer nanocomposites to be successful candidates as dental restoration/adhesion materials, a Zr‐containing and organically modified silicate‐based material system with epoxy functionality was prepared by use of a sol–gel synthesis method, and UV light‐ and visible light (VL)‐curing processes. Comparative influences of the synthesis and processing parameters on the mechanical, thermal, and microstructural/nanostructural properties of the system were detailed. Zr‐containing species proved to more effectively catalyze the epoxy polymerization/crosslinking reactions than those containing Ti. Incorporation of Zr into the nanocomposite network led to significantly advanced mechanical properties. An elastic (Young's) modulus value of 23 MPa was achieved. The system with relatively high Zr content was successfully obtained, which also had higher thermal stability. Overall observations and results suggested that Zr content, and the UV light‐ or VL‐curing process could be capitalized on to modify the structure, and to improve the final properties of these material systems, which indicated a prospective opportunity for this material system to be utilized in dental restoration/adhesion applications. POLYM. ENG. SCI., 55:792–798, 2015. © 2014 Society of Plastics Engineers

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Section: Discussionsupporting

confidence: 77%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 97%

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Synthesis and characterization of a Zr‐containing silicate‐based epoxy‐functional polymer nanocomposite system

Çopuroğlu

Şen

2014

Polymer Engineering & Sci

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“…The Shore A hardness values after 24 h of aging in distilled water at 37 °C for soft and extra-soft materials should range from 25 to 50 units and be less than 25, respectively; after 28 days of aging, the Shore A hardness values should be less than 55 and not greater than 35, respectively. Siddiqui et al [57] reported that investigations for different aging protocols should be performed with samples that are at least 6 mm thick (required by the ISO and ASTM standards). Thinner samples will yield incorrectly high values, and the error will increase as the thickness decreases.…”

Section: The Hardness Of Ltsdlsmentioning

confidence: 99%

Long-Term Soft Denture Lining Materials

2014

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Long-term soft denture lining (LTSDL) materials are used to alleviate the trauma associated with wearing complete dentures. Despite their established clinical efficacy, the use of LTSDLs has been limited due to the unfavorable effects of the oral environment on some of their mechanical and performance characteristics. The unresolved issue of LTSDL colonization by Candida albicans is particularly problematic. Silicone-based LTSDL (SLTSDL) materials, which are characterized by more stable hardness, sorption and solubility than acrylic-based LTSDLs (ALTSDLs), are currently the most commonly used LTSDLs. However, SLTSDLs are more prone to debonding from the denture base. Moreover, due to their limitations, the available methods for determining bond strength do not fully reflect the actual stability of these materials under clinical conditions. SLTSDL materials exhibit favorable viscoelastic properties compared with ALTSDLs. Furthermore, all of the lining materials exhibit an aging solution-specific tendency toward discoloration, and the available cleansers are not fully effective and can alter the mechanical properties of LTSDLs. Future studies are needed to improve the microbiological resistance of LTSDLs, as well as some of their performance characteristics.

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“…Though Shore A hardness measurement does not give insight in the physical and chemical setting reaction, this empirical technique is believed to be well correlated with stiffness and strain of the materials 26) . When measuring Shore A hardness, care should be taken to ensure that the stresses around the indenter are effectively zero both at the bottom and the edge of the specimen 27) . If the durometer tip sink into the liquid material, subsequent measurements will be affected.…”

Section: Discussionmentioning

confidence: 99%

Ultrasonic monitoring of the setting of silicone elastomeric impression materials

et al. 2017

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This study used an ultrasonic measurement device to monitor the setting behavior of silicone elastomeric impression materials, and the influence of temperature on setting behavior was determined. The ultrasonic device consisted of a pulser-receiver, transducers, and an oscilloscope. The two-way transit time through the mixing material was divided by two to account for the down-and-back travel path; then it was multiplied by the sonic velocity. Analysis of variance and the Tukey honest significant difference test were used. In the early stages of the setting process, most of the ultrasonic energy was absorbed by the elastomers and the second echoes were relatively weak. As the elastomers hardened, the sonic velocities increased until they plateaued. The changes in sonic velocities varied among the elastomers tested, and were affected by temperature conditions. The ultrasonic method used in this study has considerable potential for determining the setting processes of elastomeric impression materials.

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An experimental and theoretical study of the effect of sample thickness on the Shore hardness of elastomers

Cited by 37 publications

References 6 publications

Synthesis and characterization of a Zr‐containing silicate‐based epoxy‐functional polymer nanocomposite system

Synthesis and characterization of a Zr‐containing silicate‐based epoxy‐functional polymer nanocomposite system

Long-Term Soft Denture Lining Materials

Ultrasonic monitoring of the setting of silicone elastomeric impression materials

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