Influence of thickness, boxing, and storage on the softness of resilient denture lining materials

Kazanji, Munther N; Watkinson, A C

doi:10.1016/0022-3913(88)90381-2

Cited by 29 publications

(25 citation statements)

References 12 publications

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“…As a result, the physical and mechanical properties of the materials change with time in the patient's mouth 17,18. Softness is primarily affected by the leaching of plasticizer with a consequent hardening of the material, limiting its usefulness 9,19. The plasticiser acts as a lubricant for the polymer chains, making it easier for them to slide past one another, allowing the material to deform more easily and giving it a lower elastic modulus.…”

Section: Discussionmentioning

confidence: 99%

Wettability of denture relining materials under water storage over time

Jin

Lee²,

Lee

et al. 2009

J Adv Prosthodont

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STATEMENT OF PROBLEMPoor wettability of denture relining materials may lead to retention problems and patient discomfort.PURPOSEPurpose of this study is to compare and evaluate wettability of nine denture relining materials using contact angle measurements under air and water storage over time.MATERIAL AND METHODSNine denture relining materials were investigated in this study. Two heat-curing polymethyl-methacrylate (PMMA) denture base materials: Vertex RS, Lang, one self-curing polyethyl-methacrylate (PEMA) chairside reline resin: Rebase II, six silicone relining materials: Mucopren soft, Mucosoft, Mollosil® plus, Sofreliner Touch, GC Reline™ Ultrasoft, Silagum automix comfort were used in this experiment. Contact angles were measured using high-resolution drop shape analysis system (DSA 10-MK2, KRUESS, Germany) under three conditions (in air after setting, 1 hour water storage, and 24 hours water storage). Nine materials were classified into three groups according to material composition (Group 1: PMMA, Group 2: PEMA, Group 3: Silicone). Mean values of contact angles were compared using independent samples t-test and one-way ANOVA, followed by a Scheffe's post hoc analysis (α= 0.01).RESULTSContact angles of materials tested after air and water storage increased in the following order: Group 1 (PMMA), Group 2 (PEMA), Group 3 (Silicone). Heat-cured acrylic denture base resins had more wettability than silicone relining materials. Lang had the highest wettability after 24 hours of water storage. Silicone relining materials had lower wettability due to their hydrophobicity. Wettability of all denture relining materials, except Rebase II and Mollosil® plus, increased after 24 hours of water storage.CONCLUSIONSConventional heat-cured resin showed the highest wettability, therefore, it can be suggested that heat-cured acrylic resin is material of choice for denture relining materials.

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Section: Discussionmentioning

confidence: 99%

Wettability of denture relining materials under water storage over time

Jin

Lee²,

Lee

et al. 2009

J Adv Prosthodont

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“…The effective thickness of soft denture liners for uniformalization of stress was suggested to be 2–3 mm ( Wright, 1976; Kazanji & Watkinson, 1988). It is quite natural that the thicker the soft denture liner, the softer the material.…”

Section: Discussionmentioning

confidence: 99%

Finite element analysis of stress relaxation in soft denture liner

Sato

Abe

Okane

et al. 2000

J of Oral Rehabilitation

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To gather knowledge related to establishing criteria for selecting soft denture liners for individual patients, the effects of certain properties of soft denture liners on stress distribution were evaluated by two-dimensional finite element analysis. A partial mandibular edentulous ridge crest was modelled. Six combinations of thickness (mucosa: 1 or 2 mm; soft denture liner: 1, 2, or 3 mm) and 18 combinations of Young's modulus (mucosa: three kinds; soft denture liner: six kinds) were analysed. The ratio of maximum to minimum stress in the mucosa (stress ratio) was calculated to estimate stress concentration. In the case of thin mucosa (1 mm thickness), the lower the Young's modulus of the soft denture liner, the lower the stress ratio. However, if the soft denture liner had a lower Young's modulus than the mucosa, stress concentrated adversely. These results suggest that the elasticity of the soft denture liner should match the elasticity of the mucosa to obtain the optimum cushioning effect.

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“…A standardized thickness of 2 mm of soft denture liners was applied, as it has been proven that this is the required thickness in order the material to develop the entire spectrum of its physical properties and to be functional over time 58 . However, materials with different composition were used, affecting the combination of the results of the included studies.…”

mentioning

confidence: 99%