Effect of temperature and ageing on the mechanical properties of dental polymeric composite materials

Kandil, Sherif; Kamar, Adel A.; Shaaban, Shymaa; Taymour, Noha; Morsi, S. E.

doi:10.1016/0142-9612(89)90059-8

Cited by 17 publications

(8 citation statements)

References 15 publications

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“…It is widely reported in relevant literature 14,15 that the minimum adequate bond strength should be between 6 and 8 MPa. However, this ''threshold strength'' approach has been criticized in that it overlooks the intraoral degradation of adhesive resin 12,13 caused by fatigue, 16 temperature and pH variations, 17 and microbial degradation. 18 Additionally, previous studies 19,20 have shown that in vivo-aged bond strengths are significantly lower than the strength of artificially aged laboratory-tested bonds.…”

Section: Discussionmentioning

confidence: 99%

Effects of surface treatment and artificial aging on the shear bond strength of orthodontic brackets bonded to four different provisional restorations

Jabbari¹,

Taweel²,

Rifaiy³

et al. 2014

The Angle Orthodontist

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Objective: To evaluate the combined effects of material type, surface treatment, and thermocycling on the bond strength of orthodontic brackets to materials used for the fabrication of provisional crowns. Materials and Methods: Four materials were included in this study (ProTemp, Trim Plus, Trim II, and Superpont C+B). Sixty cylindrical specimens (1 3 3 cm) were prepared from each material and equally divided into three groups. The first group was ground with silica carbide paper, the second was polished with pumice, and the last group was sandblasted with 50-mm aluminum oxide particles. Stainless-steel maxillary central incisor brackets (Victory Series, 3M) were bonded to the provisional material specimens with Transbond XT light-cured composite resin, and half of the specimens from each group were thermocycled 500 times in 5uC and 55uC water baths. Then the brackets were debonded with shear testing, and the results were statistically analyzed by threeway analysis of variance and Tukey's multiple-comparison tests at a 5 0.05. Adhesive Remnant Index (ARI) was also identified. Results: Before and after thermocycling, ProTemp materials showed the highest shear bond strength with orthodontic brackets (10.3 and 13.1 MPa, respectively). The statistical analysis indicated an interaction among the three independent variables (P , .05) and statistically significant differences in bond strength among provisional materials (P , .001), surface treatments (P , .001), and thermocycling (P , .05). According to the ARI, most groups demonstrated adhesive failure. Conclusions: The provisional material type, surface treatment, and artificial aging have a significant effect on bond strength. Sandblasting treatment exerts a beneficial effect on shear bond strength. (Angle Orthod. 2014;84:649-655.)

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Section: Discussionmentioning

confidence: 99%

Effects of surface treatment and artificial aging on the shear bond strength of orthodontic brackets bonded to four different provisional restorations

Jabbari¹,

Taweel²,

Rifaiy³

et al. 2014

The Angle Orthodontist

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“…Also, the proposed value does not take into account the loads developed during mastication and associated loads developed while chewing hard food. Moreover, orthodontic adhesives are subjected to cyclic fatigue [15], extreme pH and temperature variations [10], and microbial degradation [14], and are exposed to water, saliva, acidic beverages and alcohol-containing liquids, which decrease the glass transition temperature of the material [18], inducing a plasticizing effect on the resin matrix. Therefore, "threshold strengths" may not cover the need for a sound bond throughout the entire treatment period.…”

Section: Diskussionmentioning

confidence: 99%

“…Der vorgeschlagene Wert berück-sichtigt ebenfalls nicht Belastungen während der Mastikation und zugehörige Belastungen während des Kauens von harten Speisen. Außerdem sind orthodontische Adhäsive zyklischer Ermüdung [15], extremen pH-Wert-und Temperaturschwankungen [10] sowie mikrobieller Degradation [14] unterworfen. Sie sind Wasser, Speichel, säurehaltigen Lebensmitteln und alkoholhaltigen Flüssigkeiten ausgesetzt, was zu einem Rückgang der Glasübergangstemperatur des Materials führt [18] und einen Plastifizierungseffekt auf die Kunststoffmatrix hat.…”

Section: Diskussionunclassified

Effect of Loading Rate on Bond Strength

et al. 2004

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The purpose of this study was to examine the effect of loading rate on the bond strength of brackets bonded to enamel. Forty premolars were used and brackets were bonded with a chemically cured or a light-cured adhesive, mounted on a testing machine, and debonded under shear stress at two loading velocities: a standard 1 mm/min, and a fast 200 mm/min which better approximates the actual jaw velocity during chewing. Bond strength results (N) were analyzed with two-way analysis of variance (loading rate, adhesive) (alpha = 0.05). An increased loading rate resulted in decreased bond strength, probably due to the induction of a stiff body response and elimination of the viscoelastic properties of the resin. The results indicated a similar effect on both chemically cured and light-cured adhesives, thus emphasizing the need for standardized test conditions in bond strength protocols. The implication of loads generated during chewing must be considered when estimating the long-term survival of the bond.

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“…Nos grupos avaliados, os valores das médias de resistência de união indicam que o uso do monômero de metilmetacrilato associado ou não ao cianoacrilato podem ser utilizados clinicamente para adesão de bráquetes metálicos à superfície de resina acrílica, visando a permanência do acessório durante o tratamento ortodôntico, minimizando o descolamento. No entanto, é importante considerar que existe uma influência da degradação intraoral da resistência adesiva [34,35] causada por fadiga [36], temperatura, variações de pH [37] e degradação microbiológica [38]. Além disso, resina acrílica ou composta mantém uma força de ligação acima do nível aceitável para utilização clínica [10,11].…”

Section: Discussionunclassified

Cianoacrilato na colagem de Bráquetes ortodônticos em resina acrílica: há maior adesão?

et al. 2016

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RESUMOPacientes em tratamento ortodôntico apresentam restaurações provisórias com frequência. No entanto, poucos estudos avaliam a influência dos adesivos na resistência ao cisalhamento dos bráquetes nessas superfícies. A resina acrílica é comumente indicada para colagem de bráquetes, porém o uso do cianoacrilato como adesivo ortodôntico é uma opção analisada. O objetivo do presente trabalho foi avaliar o desempenho do cianoacrilato associado aos materiais comumente utilizados para a fixação de bráquetes metálicos em restaurações provisórias de resina acrílica. Quarenta amostras em resina acrílica foram preparadas e as superfícies homogeinizadas com lixas de carboneto de silício (320 e 600). Em seguida, as amostras foram divididas aleatoriamente em quatro grupos (n=10) com base no tratamento de superfície e agente de união: G1 -bráquetes colados com resina acrílica; G2 -bráquetes colados com resina acrílica e aplicação de cianoacrilato; G3 -bráquetes colados com Transbond™ XT; G4 -bráquetes colados com Transbond™ XT e aplicação de cianoacrilato. Foram utilizados bráquetes ortodônticos de aço inoxidável, prescrição Roth, Kirium (3M/Abzil) para incisivos centrais superiores direitos, slot 022. Após colagem, as amostras foram submetidas ao teste de cisalhamento a uma velocidade de 0,5mm/min em uma máquina de ensaios universal (EMIC DL-1000). Os dados foram coletados e submetidos à análise estatística pelo teste ANOVA com nível de significância de 5%. A associação de resina acrílica ao cianoacrilato (G2) resultou na maior resistência ao cisalhamento (13,76 MPa), mas não significativa em comparação aos valores obtidos para a resina acrílica (G1= 7,76 MPa). O mesmo pôde ser observado para a associação Transbond™ XT e cianoacrilato (G4= 4,03 MPa) em relação a utilização da Transbond™ XT de forma isolada (G3= 3,87 MPa) e resina acrílica. O tratamento de superfície tem efeito significativo na resistência da união dos bráquetes colados aos materiais provisórios. A associação de cianoacrilato ao monômero de metilmetacrilato apresentou maior resistência ao cisalhamento, sendo mais indicada clinicamente.Palavras-chave: Ortodontia. Resistência ao Cisalhamento. Colagem Dentária. Resinas Compostas. Resina Acrílica. ABSTRACTPatients in orthodontic treatments frequently present composite restorations. However, few studies evaluated the influence of bonding materials within braces shearing bond strength on composite surfaces. The acrylic

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Effect of temperature and ageing on the mechanical properties of dental polymeric composite materials

Cited by 17 publications

References 15 publications

Effects of surface treatment and artificial aging on the shear bond strength of orthodontic brackets bonded to four different provisional restorations

Effects of surface treatment and artificial aging on the shear bond strength of orthodontic brackets bonded to four different provisional restorations

Effect of Loading Rate on Bond Strength

Cianoacrilato na colagem de Bráquetes ortodônticos em resina acrílica: há maior adesão?

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