ObjectiveThis study evaluated the effect of three metal conditioners on the shear bond
strength (SBS) of a prosthetic composite material to cpTi grade I having three
surface treatments. Material and MethodsOne hundred sixty eight rivet-shaped specimens (8.0x2.0 mm) were cast and
subjected to polishing (P) or sandblasting with either 50 mm (50SB) or 250 mm
(250SB) Al2O3. The metal conditioners Metal Photo Primer
(MPP), Cesead II Opaque Primer (OP), Targis Link (TL), and one surface
modification system Siloc (S), were applied to the specimen surfaces, which were
covered with four 1-mm thick layers of resin composite. The resin layers were
exposed to curing light for 90 s separately. Seven specimens from each
experimental group were stored in water at 37ºC for 24 h while the other 7
specimens were subjected to 5,000 thermal cycles consisting of water baths at 4ºC
and 60ºC (n=7). All specimens were subjected to SBS test (0.5 mm/min) until
failure occurred, and further 28 specimens were analyzed using scanning electron
microscope (SEM) and X-ray energy-dispersive spectroscopy (EDS). Data were
analyzed by 3-way ANOVA followed by post-hoc Tukey's test
(α=0.05). ResultsOn 50SB surfaces, OP groups showed higher SBS means than MPP (P<0.05), while no
significant difference was found among OP, S, and TL groups. On 250SB surfaces, OP
and TL groups exhibited higher SBS than MPP and S (P<0.05). No significant
difference in SBS was found between OP and TL groups nor between MPP and S groups.
The use of conditioners on 250SB surfaces resulted in higher SBS means than the
use of the same products on 50SB surfaces (P<0.05). ConclusionSandblasting associated with the use of metal conditioners improves SBS of resin
composites to cpTi.
Background:Detachment of denture acrylic resin artificial teeth from denture base resin is one of the most common problems presented by denture wearers. Purpose: This study investigated the shear bond strength (SBS) and fracture type of bonding interface of two commercial acrylic teeth (Vipi Dent Plus e Biolux) to two denture base resins (Vipi Cril e Lucitone 550) after immersion in potentially chromogenic beverages (coffee, cola soft drink, and red wine) or control solution (distilled water).Materials and Methods:Maxillary central incisor acrylic teeth were placed at 45° to denture base resin and submitted to short polymerization cycle according to manufacturers. Specimens were divided according to the combination tooth/resin/solution (n = 8) and submitted to bond strength tests in a universal testing machine MTS-810 (0.5 mm/min). Subsequently, fracture area was analyzed by stereomicroscope at a magnification of ×10 and categorized into adhesive, cohesive, or mixed failure.Results:The bond strength of teeth/denture base resins interface was not significantly affected by tested solutions (P > 0.087), except for Biolux teeth immersed in coffee (P < 0.01). In all conditions, the Vipi Dent Plus teeth showed higher bond strength to Lucitone and Vipi Cril resins when compared to Biolux teeth (P < 0.003). All specimens’ failure modes were cohesive.Conclusions:The SBS of acrylic teeth to denture base resins was not generally influenced by immersion in the tested staining beverages.
A aderência de microrganismos nos materiais para base de prótese pode favorecer o desenvolvimento de doenças como estomatite protética, cáries e doenças periodontais nos usuários de próteses removíveis parciais e totais. As características da placa microbiana presente nas próteses podem ser influenciadas por fatores relacionados ao paciente, como idade, sexo, condições sistêmicas, qualidade da microbiota bucal e uso de medicamentos e por fatores relacionados à prótese como condições de estado (suporte, retenção e estabilidade), tempo de utilização, métodos de higienização, propriedades físico-químicas da resina acrílica utilizada para a confecção da base e técnicas de confecção e polimento da prótese. Este estudo tem por objetivo discutir, por meio de uma revisão de literatura, os fatores associados à aderência de microrganismos aos materiais utilizados para a confecção de base de próteses.
RESUMOEste estudo avaliou o efeito de diferentes tratamentos superfi ciais na resistência de união ao cisalhamento de uma cerâmica feldspática (Noritake EX-3), reparada com uma resina composta (Z-100). Quarenta corpos-de-prova da porcelana foram incluídos em resina acrílica, polidos (# 320, # 600) e divididos em 4 grupos (n=10) de acordo com os tratamentos superfi ciais: G1) sem tratamento (controle); G2) condicionamento com ácido fl uorídrico a 10% por 60s; G3) asperização com ponta diamantada; G4) jateamento com Al2O3 (50μm). Após o tratamento, o silano (RelyX ceramic primer) e o adesivo (Scotchbond Multi-Purpose) foram aplicados nas superfícies da porcelana antes da união a 2 mm de resina composta. Após 24 h de armazenamento em água destilada a 37ºC e 24h de termociclagem (1.000 ciclos, 4ºC/60ºC, 15 s cada), os corpos-de-prova foram submetidos ao teste de cisalhamento em máquina de ensaios universal, com velocidade de 0,5 mm/min. Os dados foram submetidos à análise de variância e ao teste de Tukey (α=0,05). Os tratamentos superfi ciais (G2=25,00±2,99 MPa; G3=22,48±4,54 MPa; G4=24,18±5,03 MPa) demonstraram signifi cativamente (P<0,05) maiores valores de resistência de união quando comparados ao controle (G1=11,57±2,06 MPa), mas não apresentaram diferenças signifi cativas (P>0,05) entre si. A microscopia óptica revelou aproximadamente 80% de falhas adesivas para o grupo controle e 65% de falhas coesivas da porcelana para os grupos submetidos aos tratamentos superfi ciais. Foi possível concluir que os tratamentos superfi ciais avaliados melhoraram signifi cativamente a resistência entre a cerâmica Noritake e a resina Z-100.
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