Resilient liners for dentures

Travaglini, Edmund A.; Gibbons, Paul; Craig, Robert G.

doi:10.1016/0022-3913(60)90247-x

Cited by 46 publications

(8 citation statements)

References 1 publication

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“…A soft lining is a compliant material placed between the hard denture and the oral mucosa in order to treat or avoid the development of local areas of soreness under dentures [1][2][3][4]. These materials ensure a more even distribution of the forces imposed during use, absorb energy and reduce the displacement of mucosa, thus improving the comfort of the patient.…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical analysis and water sorption of some experimental elastomeric soft lining materials

Kalachandra

Parker

et al. 1996

J Mater Sci: Mater Med

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This research was undertaken to develop a better understanding of the relationships among the compositions, structures and properties of denture soft liners. Five butadiene-styrene-acrylic elastomers were prepared. They were prepared using 50% of powdered prepolymerized butadiene-styrene polymer combined with 50% of a methacrylate monomer (HMA or EHMA) plus varying amounts of initiator and crosslinker. The mixtures were gelled and processed conventionally. Specimens were then corn mitted to dynamic mechanical analysis and water sorption. Dynamic mechanical analysis was performed over the temperature range 5-95 °C at the rate of 2.5 °C/rain using a Perkin Elmer DMA-7 with 3 mm flat tip probe at 1 Hz. Wet and dry values for storage modulus (E') and damping factor (tan 8) were determined at 37 °C. Water sorption of these butadiene styrene elastomer-acrylic systems from solutions of varying concentrations was measured in order to establish the role of osmotic pressure. Diffusion coefficient (De) was determined from the desorption values. The relatively lower values of Da observed in most highly concentrated solutions particularly 1 M sodium chloride and glucose may be interpreted as related to reduced water sorption from these solutions. Increasing crosslinking increased the modulus and decreased water sorption. Using hydrophobic EHMA instead of HMA reduced water uptake, reduced dry modulus and reduced the decrease in modulus caused by water sorption. Dynamic moduli and water sorption generally exceeded those of the commercial materials studied. For all experimental materials, water uptake from saline and glucose solutions confirmed that the diffusion process is osmotically driven.

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Section: Introductionmentioning

confidence: 99%

Dynamic mechanical analysis and water sorption of some experimental elastomeric soft lining materials

Kalachandra

Parker

et al. 1996

J Mater Sci: Mater Med

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“…In particular, silicone polymers suffer from poor tear resistance, poor adhesion to poly(methyl methacrylate) dentures [71, and depending on their detailed chemical composition [8,9] may support the growth of candida albicans [8]. Usually, these silicones are of the condensation type.…”

Section: Introductionmentioning

confidence: 99%

Characterization of commercial soft liners by dynamic mechanical analysis

Kalachandra

Minton²,

Takamata

et al. 1995

J Mater Sci: Mater Med

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Although there is a significant clinical interest in suitable polymer-based soft liners, none have proven fully satisfactory in actual use. As a result there has been continued interest in the development of new materials. One major weakness in the development of improved materials has been the lack of clear understanding of structure/property relationships. This paper deals with the determination of visco-elastic properties such as E'(Storage modulus) and tan ;5 (damping factor) of four commercial materials. They represent the broad range of chemical types available for denture base soft liners. A DMA study of four materials: (1) Molloplast B (silicone); (2) Nevus (phosphazine); (3) Kurepeet (fluropolymer); and (4) Super Soft (acrylic) was made using a Perkin-Elmer DMA-7. Samples were made following the manufacturers' instructions, in the form of sheets 1.5 mm thick and 15.0 mm square. The samples were tested compressively using a 3 mm flat tip probe cycled at a frequency of 1 Hz. Wet and dry specimens were evaluated for E' and tan 8 over a 5-95 °C temperature range. Water sorption was determined gravimetrically at 37 °C. Changes in E' between the wet and dry conditions for Molloplast (B), Kurepeet and SuperSoft were insignificant. A significant increase in tan 8 for wet Nevus was observed, suggesting that the material is capable of dissipating more energy. The 'wet' modulus (E') is about 42% lower than the "'dry" modulus (E'). This difference may be attributed to the very high water sorption (34%) of Nevus. i.e. the significant decrease in E' indicates plasticization due to sorbed water. Changes in visco-elastic properties seem to occur for materials which take up large amounts of water at 37°C. DMA is found to be a useful supplement for the evaluation of soft lining materials in conjunction with the standard mechanical test methods.

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“…SOFT DENTURE liners have been advocated for denture patients, because these liners may distribute occlusal forces more evenly and may allow undercuts to be engaged 1–10 . In patients presenting with missing posterior teeth or patients with maxillary defects resulting in oral‐antral communication, the use of a soft liner may assist in retention while preventing force concentration on the residual anatomic structures 4–7,11–15 . Likewise, resilient liners have been advocated in overdenture therapy as a means of damping the forces of mastication 16–20 .…”

mentioning

confidence: 99%

The Influence of Water Storage on Durometer Hardness of 5 Soft Denture Liners Over Time

Kiat-amnuay

Gettleman

Mekayarajjananonth

et al. 2005

Journal of Prosthodontics

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After 347 days of water storage, Tokuyama had the lowest indentation hardness changes, followed by Luci-Sof, Novus, PermaSoft with sealer applied once; Molloplast-B, PermaSoft without sealer; and PermaSoft with sealer applied every month. All HTV soft denture liners had higher indentation hardness than RTV liners initially. After 347 days, PermaSoft without sealer and with sealer every month became the hardest.

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Resilient liners for dentures

Cited by 46 publications

References 1 publication

Dynamic mechanical analysis and water sorption of some experimental elastomeric soft lining materials

Dynamic mechanical analysis and water sorption of some experimental elastomeric soft lining materials

Characterization of commercial soft liners by dynamic mechanical analysis

The Influence of Water Storage on Durometer Hardness of 5 Soft Denture Liners Over Time

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