Fracture resistance of endodontically treated teeth restored with indirect composite inlay and onlay restorations – An in vitro study

Alshiddi, Ibraheem F; Aljinbaz, Amjad

doi:10.1016/j.sdentj.2015.09.001

Cited by 28 publications

(29 citation statements)

References 36 publications

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“…Comparison of fracture strength of restorations with that of sound teeth was out of the scope of this study. Moreover, some previous studies on compressive strength of sound teeth reported value, which were similar to the value in the group with 2.5 mm cusp coverage in our study ( 30 ). Therefore, there was no need to use sound premolar teeth as a control group in our study.…”

Section: Discussionsupporting

confidence: 91%

Effect of cusp coverage and water storage on compressive strength of composite restorations of premolars

et al. 2018

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BackgroundThe aim of this study was to assess the effect of cusp coverage and water storage on compressive strength of composite restorations.Material and MethodsThis in vitro experimental study was conducted on 40 extracted human maxillary premolar teeth, which were randomly divided into four groups of 10. Mesio-occluso-distal (MOD) cavities were prepared in all teeth. The thickness of composite for cusp coverage was 1.5 mm in groups 1 and 3 and 2.5 mm in groups 2 and 4. Compressive strength (CS) was measured after 24 hours in groups 1 and 2 and after six months of water storage in groups 3 and 4. Two-way ANOVA was used to statistically analyze the data.ResultsThe mean and standard error (SE) of compressive strength was 795.23 ± 35.18N in Group 1, 1232.52 ± 78.01N in Group 2, 617.18 ± 40.19N in Group 3 and 963.22 ± 50.05N in Group 4.ConclusionsStatistical analysis showed a significant difference in compressive strength measured after 24 hours (groups 1 and 3) and after six months of water storage (groups 2 and 4). The compressive strength of groups with 2.5 mm cusp coverage was significantly greater than that of groups with 1.5 mm cusp coverage. Key words:Fracture strength, cusp coverage, water absorption, composite resin, compressive strength.

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Section: Discussionsupporting

confidence: 91%

Effect of cusp coverage and water storage on compressive strength of composite restorations of premolars

et al. 2018

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“…With good values of mechanical properties, they started to be indicated for inlays, onlays, crowns and fixed partial denture [6,7]. Currently, ICR's are an excellent aesthetic alternative to ceramic due to the facility of their manufacture in the laboratory [4,6], polymerization outside the mouth [8] and more dental preservation [9].…”

Section: Introductionmentioning

confidence: 99%

“…This mathematical methodology consists in the evaluation of stress distribution trougth structures. Currently, several studies with this purpose take into consideration parameters of occlusal force and use of mesial-occlusal-distal preparations (MOD) in premolars [3,7,11]. When submitted to an occlusal load, the type of restorative material was shown to affect the deflection of the cusps [3].…”

Section: Introductionmentioning

confidence: 99%

Biomechanical behavior of indirect composite materials: a 3D-FEA study

Tribst

2017

BDS

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Objetivo: This study aimed to evaluate the influence of the elastic modulus of indirect composite resins (ICR) in the stress distribution of a restored maxillary first premolar. Material and methods: A three-dimensional (3D) finite element model of the tooth and the mesialocclusal-distal (MOD) restoration was created. Three ICR were simulated, by changing the elastic modulus: 10, 15 and 20 GPa. All materials were considered as isotropic, homogeneous and linearly elastic. An occlusal load (200 N) was applied on occlusal surface trough a sphere, and the nodes of the external surface of the root were fixed. The maximum principal stresses on the tooth and restoration were analyzed. Results: According to FE analysis, the lower the ICR elastic modulus, the higher the tensile stress values generated on the remaining tooth. For the restoration, the opposite was observed: the lower the modulus, the lower the tensile stress. Conclusion: With the limitations of this study it is possible to conclude that the greater the elastic modulus of the restorative material the harder it will be to deflect the cusps, but the easier the fracture of the resin. RESUMOObjective: Este estudo teve como objetivo avaliar a influência do módulo de elasticidade de resinas compostas indiretas (RCI) na distribuição de tensão de um primeiro pré-molar superior restaurado. Materiais e métodos: Um modelo de elemento finito tridimensional (3D) de um dente com restauração mesio-ocluso-distal (MOD) foi utilizado. Foram simulados três RCI, alterando o módulo de elasticidade: 10, 15 e 20 GPa. Todos os materiais foram considerados isotrópicos, homogêneos, lineares e elásticos. Uma carga axial (200 N) foi aplicada na superfície oclusal através de uma esfera, e os nós da superfície externa das raízes foram fixados. Foi analisada a Tensão Máxima Principal no dente e na restauração. Resultados: De acordo com a análise, quanto menor for o módulo elástico da RCI, maiores são os valores de tensão de tração gerados no dente. Para a restauração, observou-se o oposto: quanto menor o módulo, menor a tensão de tração. Conclusão: Com as limitações deste estudo, é possível concluir que quanto maior o módulo de elasticidade do material restaurador, mais difícil será a deflexão das cúspides, mas, a fratura da resina será mais fácil. O R I G I N A L A R T I C L EBiomechanical behavior of indirect composite materials: a 3D-FEA study PAlAvRAS-ChAvEAnálise por elementos finitos; Resina composta; Restauração indireta.

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“…Improved adhesion occurs due to the exposure of a bigger surface area associated with better prisms orientation and removal of weakened enamel (Carvalho et al, 2000;Mizuno et al, 2015;Schneider, Messer, & Douglas, 1981;Veneziani, 2017;Wang et al, 2018). In some situations, the bevel can also promote cusp splinting in extensive posterior restorations, reducing the risk of catastrophic fractures, similar to an onlay restoration with cusp coverage (Alshiddi & Aljinbaz, 2016;Mondelli, Ishikiriama, de Oliveira Filho, & Mondelli, 2009;Soares, Santos-Filho, Martins, & Soares, 2008). Nevertheless, prisms orientation are variable through the occlusal surface and such variations can generate doubts about the necessity of beveling the cavosurface angle, especially in wider cavities, which presents a lower fracture resistance and in which the integrity of restoration's margins is challenging to be achieved (Giorgi et al, 2014;Soliman et al, 2016;Veloso et al, 2018), especially because some reports show no improvement in cavities with bevel, resulting in an unnecessary cavity overextension (Mahn et al, 2015;Soliman et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of cavosurface angle beveling on the exposure angle of enamel prisms in different cavity sizes

Meurer¹,

Rizzante

Maenossono

et al. 2019

Microscopy Res & Technique

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The quality of the micromechanical retention between the enamel prisms exposed through acid etching and adhesive system can be influenced by the relationship between the angle of the exposed enamel prisms and the external surface/restorative material. Therefore, the aim of the present study was to determine the influence of the enamel cavosurface beveling in different cavity sizes on the angle relation between enamel prisms and the restorative material. For this research, 30 human permanent molars were used and divided into three groups according the isthmus aperture of class I cavities (1/4, 1/3, and 1/2 of the intercuspal distance). Cavosurface angle beveling was performed in each tooth buccal or palatal/lingual side, and a resin composite restoration was placed. Each restored tooth was sectioned in buccal/palatal direction followed by analysis in scanning electron microscope. Means of the angles observed between enamel prisms and the restorative material were registered and statistically analyzed by Kruskal‐Wallis test. Results showed higher mean angle values for beveled groups when comparing with the values observed in the unbeveled margins (p < .05) regardless of the isthmus aperture, being 1/4 (beveled = 48.36°; unbeveled = 20.71°), 1/3 (beveled = 39.75°; unbeveled = 29.15°), and 1/2 (beveled = 37.02°; unbeveled = 26.34°). It was also observed that in some unbeveled cavities, there were the presence of laterally exposed enamel prisms (0°), mainly in more conservative cavities. It was concluded that the presence of higher angles values occurred in the samples with beveled margins, without presence of laterally exposed enamel prisms.

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Fracture resistance of endodontically treated teeth restored with indirect composite inlay and onlay restorations – An in vitro study

Abstract: Within the limitations of this study, endodontically treated teeth were successfully restored with indirect composite inlay and onlay restorations. However, the fractures that accompanied the inlay restorations were more severe and were unable to be restored.

Cited by 28 publications

References 36 publications

Effect of cusp coverage and water storage on compressive strength of composite restorations of premolars

Effect of cusp coverage and water storage on compressive strength of composite restorations of premolars

Biomechanical behavior of indirect composite materials: a 3D-FEA study

Effect of cavosurface angle beveling on the exposure angle of enamel prisms in different cavity sizes

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