Mechanical properties of elastomeric impression materials

Salem, Nabil; Combe, E.C.; Watts, D.C.

doi:10.1111/j.1365-2842.1988.tb00761.x

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…The clinical tear performance of a material also appears crucial [ 15 , 16 ]: it involves complex interactions between polymer and fillers, flow to a particular film thickness, release properties from tooth and soft tissue, presence of internal and surface defects, and rate of impression withdrawal. Because of the complexities of integrating and measuring these properties, laboratory tests evaluating the propagation energy of a tear have been employed as common ways to evaluate elastic dental materials [ 9 , 17 ]. New “hydrophilic” elastomeric impression materials have been recently introduced with the goals of reducing marginal voids and distortion in the impressions and improving the quality of gypsum dies, but there are still insufficient data on their mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

“…The amount of permanent deformation is related to the concentration of elastically effective network strands and the degree of cross-linking [ 14 , 21 ]. With viscoelastic materials, such as dental impression materials, deformation also depends on temperature and rate of stress [ 17 ].…”

Section: Discussionmentioning

confidence: 99%

“…Many studies [ 9 , 14 , 15 , 20 , 22 – 24 ] on tear strength have been carried out so far; however, standardized test methods have not been established. As a result, comparison between different impression materials using the available literature data still appears quite difficult [ 15 , 17 ].…”

Section: Discussionmentioning

confidence: 99%

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Mechanical Properties of Elastomeric Impression Materials: An In Vitro Comparison

Angelis

Augusti

et al. 2015

International Journal of Dentistry

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Purpose. Although new elastomeric impression materials have been introduced into the market, there are still insufficient data about their mechanical features. The tensile properties of 17 hydrophilic impression materials with different consistencies were compared. Materials and Methods. 12 vinylpolysiloxane, 2 polyether, and 3 hybrid vinylpolyether silicone-based impression materials were tested. For each material, 10 dumbbell-shaped specimens were fabricated (n = 10), according to the ISO 37:2005 specifications, and loaded in tension until failure. Mean values for tensile strength, yield strength, strain at break, and strain at yield point were calculated. Data were statistically analyzed using one-way ANOVA and Tukey's tests (α = 0.05). Results. Vinylpolysiloxanes consistently showed higher tensile strength values than polyethers. Heavy-body materials showed higher tensile strength than the light bodies from the same manufacturer. Among the light bodies, the highest yield strength was achieved by the hybrid vinylpolyether silicone (2.70 MPa). Polyethers showed the lowest tensile (1.44 MPa) and yield (0.94 MPa) strengths, regardless of the viscosity. Conclusion. The choice of an impression material should be based on the specific physical behavior of the elastomer. The light-body vinylpolyether silicone showed high tensile strength, yield strength, and adequate strain at yield/brake; those features might help to reduce tearing phenomena in the thin interproximal and crevicular areas.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Mechanical Properties of Elastomeric Impression Materials: An In Vitro Comparison

Angelis

Augusti

et al. 2015

International Journal of Dentistry

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“…Impression materials are polymers with highly flexible coiled chains that uncoil upon loading and exhibit nearly complete elastic recovery when the load is removed [35]. Permanent deformation is related to factors such as the degree of cross-linking of the polymer strands, temperature, and the rate of applied stress [40,44]. Lu et al [46] found that flexibility or stiffness of the material was inversely correlated to elastic recovery; therefore, the higher the elastic recovery, the lower the stiffness.…”

Section: Elastic Recoverymentioning

confidence: 99%

Evaluation of the properties of a new super quick-setting (2 min) polyether impression material

Singer

Keilig

Fichte³

et al. 2023

Clin Oral Invest

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Objectives Although a new super-quick setting polyether impression material has been commercially recently introduced, its properties have not been yet reported. Thus, it was the aim of this study to assess the dimensional stability, tear strength, and elastic recovery of the new material and to compare it with another commonly used polyether and polyvinyl siloxane. Materials and methods A new super-quick set polyether, a regular set polyether and a polyvinylsiloxane (PVS) impression material have been used in the study. Dimensional changes were measured using a modified mold as per ISO 4823:2000 after 1 h and 7 days. Tear strength was evaluated by subjecting specimens to tension until failure with a crosshead speed of 250 mm/min. Elastic recovery was measured by deforming specimens using a materials testing machine to a height of 16 mm (20% strain). The change in length (ΔL) was measured afterwards and elastic recovery was calculated in percentages. Results Dimensional changes of the super quick and regular set polyether were comparable in both the vertical and horizontal dimensions after 24 h and 7 days. All the tested materials showed dimensional change values far below the maximum accepted ISO requirement (1.5%). The super quick setting polyether showed significantly improved tear strength (4.9 N/mm) in comparison to the regular set polyether (3.5 N/mm) and similar to PVS (5.2 N/mm). The elastic recovery of PVS (99.6%) was the highest among all the groups. Conclusions and clinical relevance The newly available super-fast set polyether offers a great potential for a reduced chair side time and comfort for both, the patient and the dentist. Super quick polyether showed as well improved tear strength, which is considered one of the shortcomings of the regular set polyether. In addition, the new polyether was as accurate as the regular set polyether and with good elastic recovery.

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“…Many methods have been used to increase the bond strength between the tray and the impression material, such as perforations. Mechanical retention however by using perforations is difficult to achieve at the periphery of the tray and where the handle joins the tray [4,5]. Also these perforations are not so effective in the palatal region where the tray is stressed in tension.…”

Section: Introductionmentioning

confidence: 99%

Comparison Study of the Shear Bond Strength Between Polyether and Addition Silicone Impression Materials

Oboudi¹

2009

JNUS

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The impression material is used mainly in the area of removable partial and complete denture and in the construction of inlays, crowns and bridges. They are used also in dental laboratories for duplicating master casts.Recent studies have evaluated the bond strength of selected impression materials. This research was performed to study the shear bond strength of impression materials to tray by testing forty samples, each of which consisted of two blocks of acrylic with the impression material sandwiched between them. Tray adhesive was used to increase adhesion between impression material and custom tray. Also this research showed that by the use of perforation impression materials adhere firmly to the impression trays. Therefore perforation -adhesive combination gave acceptable results.Experimental results indicated that polyether impression material showed higher shear bond strength values to cold-cure acrylic than addition silicone impression material for both control and perforated samples without adhesive application. The shear mean bond strength values of polyether to the tray material after adhesive application were decreased. While, the shear mean bond strength increased significantly when addition silicone was used with the adhesive and with the combination samples.

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Mechanical properties of elastomeric impression materials

Cited by 12 publications

References 6 publications

Mechanical Properties of Elastomeric Impression Materials: An In Vitro Comparison

Mechanical Properties of Elastomeric Impression Materials: An In Vitro Comparison

Evaluation of the properties of a new super quick-setting (2 min) polyether impression material

Comparison Study of the Shear Bond Strength Between Polyether and Addition Silicone Impression Materials

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