Impact strength of denture base and reline acrylic resins subjected to long-term water immersion

Wady, Amanda Fucci; Machado, Ana Lúcia; Vergani, Carlos Eduardo; Pavarina, Ana Cláudia; Giampaolo, Eunice Teresinha

doi:10.1590/s0103-64402011000100010

Cited by 16 publications

(23 citation statements)

References 18 publications

(37 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, for the reline resin T bulk specimens, thermocycling resulted in significantly lower IS. Although one could argue that the reduced IS of T for the thermocycled group was due to the effect of water absorption alone and that thermocycling may not be a factor, it has been observed that storage in water at 37°C for up to 6 months did not affect the IS of reline resin T. 21 In addition, Archadian et al 5 also observed that thermocycling led to a decrease in the flexural strength of the reline polymer-only specimens. These results suggest that for some materials, besides the plasticizing effect of the absorbed water, the increased temperature may also alter their mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Impact strength of denture base and reline acrylic resins: An in vitro study

Machado

Bochio²,

Wady³

et al. 2012

Journal of Dental Biomechanics

View full text Add to dashboard Cite

This study evaluated the impact strength of a denture base resin (Lucitone 550—L) and four reline resins (Tokuyama Rebase II—T; Ufi Gel Hard—U; New Truliner—NT, and Kooliner—K), both intact and in a reline combination (L/L, L/T, L/U, L/NT, and L/K). For each group (n = 20), half of the specimens were thermocycled before testing. Charpy tests were performed, and the impact strengths were calculated. Data were analyzed by two-way analyses of variance and Tukey’s test (p = 0.05). For the intact groups, mean impact strength values for L (1.65 and 1.50) were significantly higher than those of the reline resins (0.38–1.17). For the relined groups, the highest mean impact strength values were produced by L/T (5.76 and 5.12), L/NT (6.20 and 6.03), and L/K (5.60 and 5.31) and the lowest by L/U (0.76 and 0.78). There were no significant differences between L and L/L. Thermocycling reduced the impact strength of T (from 0.73 to 0.38) and L/L (from 1.82 to 1.56).

show abstract

Section: Discussionmentioning

confidence: 99%

“…19–21 Moreover, the effect of thermal stresses on the IS of denture base and reline resins has not been investigated. Thus, the aim of this study was to evaluate the IS of one denture base acrylic resin and four hard chairside reline resins, tested alone (bulk specimens) or in combination (denture base/reline materials).…”

Section: Introductionmentioning

confidence: 99%

Impact strength of denture base and reline acrylic resins: An in vitro study

Machado

Bochio²,

Wady³

et al. 2012

Journal of Dental Biomechanics

View full text Add to dashboard Cite

show abstract

“…The hard reline material used in this present study has in its composition the plasticizer isobutyl methacrylate, di-n butylphthalate 23 and toluidine ring, which acts as an activator of the chemical reaction of polymerization [24][25] . Although this material has no cross-chain agents, these molecules can fill the voids and, thereby, reduce the water absorption 24 .…”

Section: Discussionmentioning

confidence: 99%

“…Although this material has no cross-chain agents, these molecules can fill the voids and, thereby, reduce the water absorption 24 . It is possible to hypothesize that the thermally activated materials have a higher degree of polymerization, resulting in larger amount of monomer converted to polymer in relation to the chemically activated, that have higher amounts of residual monomer 14,[24][25] . The amount of residual monomer may adversely affect the mechanical properties, such as hardness and tensile strength [26][27] .…”

Section: Discussionmentioning

confidence: 99%

Effect of thermocycling in a hard denture liner and acrylic resin after different chemical and mechanical polishing

Alignani

Pantoja

Takahashi

et al. 2015

RGO, Rev. Gaúch. Odontol.

View full text Add to dashboard Cite

ObjectiveTo evaluate the effect of aging in a hard denture reline (New Truliner) and an acrylic resin (Classic) ANOVA and Tukey test (α=5%). Results Regardless of the polishing, it was noted that RAC presented significantly higher surface hardness than NT; PM had higher hardness in both materials compared with PQ; on both polishing, the impact resistance of the RAC was higher than NT. Independently of TR test, the impact resistance of the materials that received PQ was higher than received PM. The PQ caused greater changes in properties than the PM. Conclusion Aging and chemical and mechanical polishing influenced the physical and mechanical properties of hard denture reline and acrylic resin.Indexing terms: Acrylic resins. Aging. Denture liners. Hardness. RESUMO ObjetivoAvaliar o efeito da termociclagem em reembasador rígido para próteses totais (New Truliner) e resina acrílica (Clássico) após polimento químico e mecânico. MétodosForam confeccionados 80 corpos de prova, divididos de forma randomizada entre 8 grupos: G 1. Resina Acrílica Clássico (RAC)/Polimento mecânico (PM); G 2. RAC/PM + termociclagem (TR); G 3. RAC/Polimento químico (PQ); G 4. RAC/PQ + TR; G 5. New Truliner (NT)/PM; G 6. NT/PM + TR; G 7. NT/PQ; G 8. NT/PQ + TR. A dureza superficial foi mensurada antes e após os polimentos, e após a TR. Os ensaios de resistência ao impacto foram mensurados após todos os tratamentos. Os dados foram submetidos à análise de variância e Tukey (α=0,05). ResultadosIndependente do polimento verificou-se que RAC apresentou resultados de dureza superficial significativamente mais altos que NT; PM gerou superfícies mais duras em ambos os materiais quando comparado ao PQ; em ambos os polimentos, os valores de resistência ao impacto da RAC foram maiores que os do NT. Independentemente da realização da TR, a resistência ao impacto dos materiais que receberam PQ foi maior que a dos que receberam PM. PQ causou maior alteração nas propriedades do que PM. ConclusãoA termociclagem e os polimentos químico e mecânico influenciam as propriedades físicas e mecânicas do reembasador rígido e da resina acrílica. Termos de indexação:Resinas acrílicas. Envelhecimento. Reembasadores de dentadura. Dureza. Effect of thermocycling in a hard denture liner and acrylic resin after different chemical and mechanical polishingEfeito da termociclagem em reembasador rígido para prótese e resina acrílica após polimento químico e mecânico

show abstract

“…Should a contacting solution be pigmented, discoloration is also possible during service in the oral environment [2]. The sorption phenomenon is of considerable importance since it results in dimensional changes [3,4], as well as a reduction of flexural strength [5,6], impact strength [7], transverse strength [8] and fatigue life of PMMA [9]. Another problem of PMMA is the presence of surface and subsurface voids which may compromise its physical, aesthetic and hygiene properties [10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

2014

J Chem Appl

View full text Add to dashboard Cite

Background and objective: Parylenes are conformal protective polymer coating materials utilized in various biomedical applications since they are chemically and biologically inert and stable. Acrylic resins, used in the manufacturing of different types of intra-oral prostheses, are vulnerable to fluid sorption and solubility and consequently alteration of different physical and mechanical properties. This study investigated the effect of surface coating of polymethyl methacrylate (PMMA) with Parylene-C, on surface free energy, water sorption, solubility, and staining.Methods: Specimens were fabricated using heat-polymerizing PMMA, half were randomly chosen to be coated with Parylene-C and various groups were created for testing as follows: 24 specimens were subjected to water sorption and solubility tests in distilled water according to ISO 20795-1:2008 for denture base polymers. 48 specimens underwent staining tests by soaking in distilled water or coffee solution for one week. Discoloration was measured by comparing total colour differences (ΔE) and lightness values (L*) across groups after obtaining CIE L*a*b* values of all samples using a digital camera imaging and appropriate image analysis software. A further 40 samples were subjected to contact angle readings using deionized water and glycerol followed by surface free energy calculations. Nonparametric Mann-Whitney tests were used for statistical analysis (P<0.01).Results: Coated PMMA specimens demonstrated significantly less water sorption and lower surface free energy compared to noncoated (P <0.001), while no significant difference was found in solubility (P= .028). The coating did not have a significant effect on ΔE values after the staining tests, but the L* values in coated samples were significantly higher compared to the uncoated ones.Significance: This study forms part of a series of experiments on the effect of Parylene coating of PMMA. The modified surface properties of coated PMMA may prolong the lifetime of intraoral prostheses and possibly reduce biofilm formation.

show abstract

Impact strength of denture base and reline acrylic resins subjected to long-term water immersion

Cited by 16 publications

References 18 publications

Impact strength of denture base and reline acrylic resins: An in vitro study

Impact strength of denture base and reline acrylic resins: An in vitro study

Effect of thermocycling in a hard denture liner and acrylic resin after different chemical and mechanical polishing

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

Contact Info

Product

Resources

About