Long-Term Soft Denture Lining Materials

Abstract

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.

The properties of experimental silicones reinforced with silica fillers for dentistry

“…This properties are related with changes in the hardness, bond strength, discoloration, odour, and easier bacterial adhesion to the surface a can be different [19,21]. The silicones are well known prosthetic materials characterized by low sorption and solubility values [5] and it corresponds very well with presented results. Additionally the obtained values are similar to those for other materials available on the market [14,22,23].…”

“…The water sorption and solubility of soft lining materials are generally dependent on the hydrophilicity of the matrix and on the leachable components [5]. This properties are related with changes in the hardness, bond strength, discoloration, odour, and easier bacterial adhesion to the surface a can be different [19,21].…”

“…Although the reaction of silyl hydride groups (-SiH) with vinyl groups (CH2=CH-) occurs at a 1:1 stoichiometry, when functionalized silica fillers are used, the ratio of vinyl to hydride is considerably higher. The optimal proportion may be determined, for example, by determining the hardness of samples achieved with diverse ratios [5]. Different applications of this materials requires the universal and specific properties.…”

“…The other destinations of those materials are long-term soft denture lining materials, relining in implantology, postoperative obturators and maxillofacial prosthesis [1][2][3][4][5][6]. During polymerization reaction the addition of silyl hydride groups to vinyl groups of vinyl polydimethylsiloxane is linked with the assistance of a platinum catalyst [5,7]. This reaction takes place without formation of by-products and allows to obtain a polymer network.…”

Fracture Resistance of Relined Microwave-Cured High Impact Versus Conventional Heat-Cured Acrylic Resin Mandibular Denture Bases: An in Vitro Study

“…Despite the strong desire of the patients to obtain well-fitting dentures, as well as, clinician's efforts to fabricate satisfactory dentures, there are still edentulous patients who are suffering during eating while wearing their conventional complete dentures. One of the most important reasons for this problem is atrophic and thin mucosa that bears the stress caused by occlusal forces [2][3][4][5][6][7]14 . Therefore, resilient denture liners are used for those patients who are unable to tolerate the pressures transmitted by prosthesis to the thin and relatively non-resilient mucosa 6 .…”