Water uptake of soft lining materials from osmotic solutions

Parker, Sandra; Riggs, P.D.; Braden, M.; Kalachandra, S.; Taylor, D.F.

doi:10.1016/s0300-5712(96)00025-5

Cited by 22 publications

(14 citation statements)

References 9 publications

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“…1). These results support the theory that the high water uptake of these materials is osmotically driven [23]. As the osmotic pressure of the external solution in saline is higher than that of distilled water, the difference between the internal droplets and the external solution will be lower.…”

Section: Resultssupporting

confidence: 84%

Silica-filled elastomer/methacrylate systems as soft liners

Nazhat

Parker²,

Braden³

2004

Journal of Biomaterials Science, Polymer Edition

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Denture soft lining materials are compliant cushions used at the oral tissue-denture interface. They are generally required to have sufficient compliance to redistribute mastication load, as well as an adequate modulus for long-term dimensional stability and control over the water uptake. This study investigated the effect of using silane treated fumed silica as a filler on the properties of experimental soft lining materials based on blends of isoprene-styrene (SIS) block co-polymer and mixtures of methyl methacrylate (MMA) and 1,6-hexandiol dimethacrylate (HDMA). The overall elastomer/monomer ratios were maintained, whereas the monomers ranged from 10 to 60% HDMA. The silica filler level was maintained at 10 wt% with respect to SIS. The properties investigated were the dynamic mechanical parameters of storage modulus (E') and tan delta as a function of temperature and the quasi-static mechanical parameters of ultimate tensile strength (UTS) and elongation to break (Eb) as well as absorption properties that were carried out in water and saline. In both unfilled and filled systems there was an increase in E' and a decrease in tan delta with an increase in HDMA. Silica addition tended to increase E' and substantially reduce tan delta in materials with less than 20% HDMA. UTS decreased with filler and HDMA content, however, Eb was greater for filled systems. Generally, in the long term, the water uptake decreased with increasing HDMA content and E'. The silanated silica further reduced the water uptake, indicating a cross-linking effect, thus increasing the restraining force on droplet growth. The uptake in saline was significantly reduced indicating an osmotically controlled uptake process.

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Section: Resultssupporting

confidence: 84%

Silica-filled elastomer/methacrylate systems as soft liners

Nazhat

Parker²,

Braden³

2004

Journal of Biomaterials Science, Polymer Edition

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“…Parker et al [15,16] also reported that polymerizable plasticizers such as dioctyl maleate cannot leach out of the resin as easily as conventional plasticizers and that soft lining materials containing such plasticizers possess appropriate mechanical properties. Light-cured urethane acrylate (Triad Resiline) and a polyphosphazene elastomer compounded with methacrylate monomers (Novus) are additional examples of materials used as LTSDLs [7]. …”

Section: Compositions Of Ltsdlsmentioning

confidence: 99%

“…Although the longevity of SLTSDLs was confirmed under clinical conditions, the presence of discoloration and odor was frequently reported among tobacco smokers [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,31]. Moreover, a gradual increase in the number of fungal colonies on the surfaces of the linings was observed during the first year of use, along with slight discoloration in non-smokers and the local debondings of LTSDLs from the denture base [32].…”

Section: Clinical Effects Of Long-term Soft Denture Liningsmentioning

confidence: 99%

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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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“…Soft denture lining materials lose their inherent softness over time due to oral fluids absorption and solubility of plasticizers, unpolymerized or soluble compounds into saliva [59][60][61][62] . These processes result in a stiffer, harder, less resilient liner with unstable properties over time 63 . Loss of softness may cause greater occlusal forces' delivery to the denture bearing tissues as well as associated clinical problems and patient's complaints 59 .…”

mentioning

confidence: 99%